API

Flanged Safety Relief Valves

Series 526

CATALOG
The-Safety-Valve.com

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 Valve finder
How to find the right product group

High

controlled
Medium­
High operating to set Yes
pressure ratio, high backpressure Efficiency
or low total height?

No

Clean
Clean Service Yes
application? Service

No

Critical
Critical Service / highly corrosive Yes
application? Service

No

Safety valves
API
API specified Yes
application?

Spring loaded
No

Steam, gas and liquid application Modulate

Yes
with low capacity in relation Action
to valve size?

No

Orifice ≥ F High
Performance

Required
Orifice letter?
Compact
Performance
Orifice ≤ F
over valve

Bursting­

Best
Change-

Additional components Yes

disc

beyond safety valves Availability

4745_API_LWF_EN_Catalog.indd 2 28.03.18 10:00

 General
The-Safety-Valve.com

Contents

Type 526
Page

General 2
Valve finder 2
General Information 4
D

Type 526 6
Materials E
• Conventional design 6
• Balanced bellows design 8

Article numbers F
• Overview 12

Dimensions
• Metric units 16
• US units 18 G
Weights
• Metric units 16
• US units 17
H
Orifice D – T
• Pressure temperature ratings [Metric + US units] 18

Available options 46 J
Flange drillings 48
Outlet flange rating class 300 50
Flange facings 53
K
LESER Original Spare Parts Kits 54
Approvals 55

T
Plain lever H3 Plain lever H3
Closed bonnet Open bonnet
Conventional design Conventional design
Options

Cap H2 Packed lever H4 Cap H2

Closed bonnet Closed bonnet Closed bonnet
Conventional design Conventional design Balanced bellows design
3

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General

General Information

The API product group represents

Full range of spring loaded safety valves

acc. to API 526
 State-of-the-art design from the safety valve specialist
 Competitive solutions for the API market

API safety valves from LESER

• Are designed to meet all applications which require API.
• Open rapidly with an overpressure of max. 10 % to the
full design lift.
• Have a maximum blowdown of 7 % for steam/gas
service and 20% for liquid service.
• Are developed in a close cooperation with plant
engineers and service specialists.
• Serve for protection of processes and equipment.
• Are approved by all important approval organisations
worldwide which ensures the worldwide applicability
e.g.:

•E uropean Community: CE-marking acc. to Pressure

Equipment Directive 2014/68/EU and EN ISO 4126-1
• USA: UV-stamp acc. to ASME Section VIII Division 1,
National Board certified capacities
• Germany: VdTÜV approval acc. to PED,
EN ISO 4126-1, TÜV SV 100 and
AD 2000-Merkblatt A2
• Canada: Canadian Registration Number acc. to the
requirements of particular provinces
• China: AQSIQ based on the approval acc. to ASME
Section VIII Division 1 and AD 2000-Merkblatt A2
• Eurasian Custom Union: Approval acc. to Eurasian
Custom Union (EAC - Eurasian Conformity)

Furthermore, all LESER API safety valves are designed,

marked, produced and approved acc. to the requirements
of the following regulations (directives, codes, rules and
standards).

EN ISO 4126-7, EN 12266-1/-2, EN 1092 Part I and II

flanging, ASME PTC 25, ASME-Code Sec. II, ASME B
16.34 and ASME B16.5-flanging, API Std. 527,
API RP 576, AD 2000-Merkblatt A4,
AD 2000-Merkblatt HP0
UV

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 General
The-Safety-Valve.com

Applications General design features

LESER – API safety valves offer ultimate protection LESER´s API Series covers a large variety of types, materi-
against overpressure in all applications for steam, gases als and options to fit any application:
and liquids.
• Design fully in accordance with API 526
LESER´s API Series safety valves present the simple safe for easy interchangeability
solution for heavy duty applications, such as crude oil • Complete API 526 range: valve sizes 1" through 8",
extraction, transportation and processing in orifice D through T
• Materials: WCB, WCC, CF8M, WC6, LCB, LCC,
• Refineries
and a wide range of special materials to fulfill the
• Chemical industry requirements of critical applications
• Petrochemical industry • Special B3 design for high back pressure applications
• Oil and gas – Onshore and Offshore and material requirements far beyond API Standard
• Vessels and piping systems • Fool proof design with fewer parts for built-in safety
• Blow-down systems • Integral cast support brackets for easy handling
• Storage tank farms and safe installation
• Open or closed bonnet, packed or plain lifting lever
or gastight cap
• Flanged connections according ASME and DIN
guarantee a worldwide applicability
• One design and spring (single trim) for steam, gas and
liquid applications reduces the number of spare parts
and ensures low cost maintenance management.
• One-piece spindle reduces friction which leads
to high operation accuracy
• Self-draining body design, avoids residues
and reduces corrosion
• Horizontal installation

Options
• Special connections specified by the customer
for optimised adaptation to the plant.
• Stellited or hardened metal sealing for longer product life
• Soft seat solutions for superior tightness
• Balanced bellows for back pressure compensation
• Heating jackets for applications with high viscosity fluids
• Any and every part can be produced in special material
exactly to meet customer specification requirements

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 Type 526
Conventional design
Type 526

40 Cap H2

19 Lock nut

18 Adjusting screw

69 Needle bearing

16 Spring plate

54 Spring

12 Spindle

9 Bonnet

14 Split ring

17 Spring plate

55 Stud

56 Nut

8 Guide
Plug 64

60 Gasket

22 Lift restriction

57 Ball

66 Screw

61 Ball

73 Lock screw

7 Disc

6 Adjusting ring

1 Body

5 Nozzle
6

Schnitt 526 H2
4c
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 The-Safety-Valve.com

Type 526
Conventional design
Materials

Type 526
Standard Service Type 5262 Corrosive Service Type 5264 Type 5267 Type 5263
Item Component
Trim: Standard Trim: Standard Trim: Standard Trim: Standard

1.0619 1.4408 1.7357

1 Body
SA 216 WCB SA 351 CF8M SA 217 WC6 SA 352 LCB
1.4408 1.4408 1.4408 stellited 1.4408
5 Nozzle 1)
CF8M CF8M CF8M stellited CF8M
1.4408 1.4408 1.4408 1.4408
6 Adjusting ring
CF8M CF8M CF8M CF8M
1.4122 1.4404 stellited 1.4122 1.4122
7 Disc
Hardened stainless steel 316L stellited Hardened stainless steel Hardened stainless steel
1.0501 1.4404 1.4404 1.0501
Guide
Steel 316L 316L Steel
8
1.4104 tenifer – – 1.4104 tenifer
with bushing
Chrome steel tenifer – – Chrome steel tenifer
1.0619 1.44082) 1.7357
SA 216 WCB SA 351 CF8M SA 217 WC6 SA 352 LCB
9 Bonnet
1.03054) 1.4571 / 1.44043) 1.03054) 1.03054)
Steel SA 479 316Ti / 316L Steel Steel
1.4021 1.4404 1.4021 1.4021
12 Spindle
420 316L 420 420
1.4104 1.4404 1.4104 1.4104
14 Split ring
Chrome steel 316L Chrome steel Chrome steel
1.07183) 1.4404 1.07185) 1.07185)
16 / 17 Spring plate
Steel 316L Steel Steel
1.4104 1.4404 tenifer 1.4104 1.4104
Adjusting screw
Chrome steel 316L tenifer Chrome steel Chrome steel
18
PTFE 15% glass PTFE 15% glass PTFE 15% glass PTFE 15% glass
with bushing
PTFE 15% glass PTFE 15% glass PTFE 15% glass PTFE 15% glass
1.0718 1.4404 1.0718 1.0718
19 Lock nut
Steel 316L Steel Steel
1.4404 1.4404 1.4404 1.4404
22 Lift restriction
316L 316L 316L 316L
1.0460 / 0.7040 1.4404 1.0460 / 0.7040 1.0460 / 0.7040
40 Cap H2
SA 105 / Gr. 60-40-18 316L SA 105 / Gr. 60-40-18 SA 105 / Gr. 60-40-18
1.7102, 1.8159 1.4310 1.7102, 1.8159 1.7102, 1.8159
54 Spring
High temp. alloy steel Stainless steel High temp. alloy steel High temp. alloy steel
1.4401 1.4401 1.4401 1.4401
55 Stud
B8M B8M B8M B8M
1.4401 1.4401 1.4401 1.4401
56 Nut
8M 8M 8M 8M
1.4401 1.4401 1.4401 1.4401
57 Ball
316 316 316 316
Graphite / 1.4401 Graphite / 1.4401 Graphite / 1.4401 Graphite / 1.4401
60 Gasket
Graphite / 316 Graphite / 316 Graphite / 316 Graphite / 316
1.3541 1.4401 1.3541 1.3541
61 Ball
Hardened stainless steel 316 Hardened stainless steel Hardened stainless steel
Steel 1.4401 Steel Steel
64 Plug
Steel B8M Steel Steel
1.4401 1.4401 1.4401 1.4401
66 Screw
B8M B8M B8M B8M
1.4404 1.4404 1.4404 1.4404
69 Needle bearing
316L 316 L 316L 316L
1.4404 1.4404 1.4404 1.4404
73 Lock screw
316L 316L 316L 316L
1)
Stellited sealing surfaces please refer to page 102, Extended Catalog. LESER reserves also to use the nozzle material 1.4404 / 316L. 2) Valve sizes up to 6" x 8" 3) Valve sizes ≥ 6" x 10"
4)
Valve size 6 R 10, 8 T 10 and 6 Q 8 in high pressure design (Option code Z90). 5) For valve sizes 6 Q 8, 6 R 10 and 8 T 10 in high pressure design: 1.4122 / chrome steel.
Please notice: Special materials:
- Modifications reserved by LESER. See API Alloy Concept page 80, Extended Catalog.
- If several materials are specified LESER defines the material.
- LESER can upgrade materials without notice.
- Every part can be replaced by other material acc. to customer specification. 7

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 Type 526
Balanced bellows design
Type 526

40 Cap H2

19 Lock nut

18 Adjusting screw

69 Needle bearing

16 Spring plate

54 Spring
12 Spindle

9 Bonnet

14 Split ring

17 Spring plate

55 Stud
56 Nut

8 Guide

60 Gasket

11 Bonnet spacer
15 Balanced bellows

57 Ball

66 Screw

61 Ball

7 Disc

73 Lock screw

6 Adjusting ring

1 Body
5 Nozzle
8
Schnitt 526 H2 SB
4c
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 The-Safety-Valve.com

Type 526
Balanced bellows design
Materials

Type 526
Standard Service Type 5262 Corrosive Service Type 5264 Type 5267 Type 5263
Item Component
Trim: Standard Trim: Standard Trim: Standard Trim: Standard

1.0619 1.4408 1.7357

1 Body
SA 216 WCB SA 351 CF8M SA 217 WC6 SA 352 LCB
1.4408 1.4408 1.4408 stellited 1.4408
5 Nozzle 1)
CF8M CF8M CF8M stellited CF8M
1.4408 1.4408 1.4408 1.4408
6 Adjusting ring
CF8M CF8M CF8M CF8M
1.4122 1.4404 stellited 1.4122 1.4122
7 Disc
Hardened stainless steel 316L stellited Hardened stainless steel Hardened stainless steel
1.4404 1.4404 1.4404 1.4404
8 Guide
316 L 316L 316L 316L
1.0619 1.44082) 1.7357
SA 216 WCB SA 351 CF8M SA 217 WC6 SA 352 LCB
9 Bonnet
1.03054) 1.4571 / 1.44043) 1.03054) 1.03054)
Steel SA 479 316Ti / 316L Steel Steel
1.0460 1.4408 1.4408 1.4408
11 Bonnet spacer5)
SA 105 SA 351 CF8M SA 351 CF8M SA 351 CF8M
1.4021 1.4404 1.4021 1.4021
12 Spindle
420 316L 420 420
1.4104 1.4404 1.4104 1.4104
14 Split ring
Chrome steel 316L Chrome steel Chrome steel
End 2.4856 1.4404 2.4856 1.4404 2.4856 1.4404 2.4856 1.4404
15 Bellows
pieces Inconel 625 316L Inconel 625 316L Inconel 625 316L Inconel 625 316L
1.07184) 1.4404 1.07186) 1.07186)
16 / 17 Spring plate
Steel 316L Steel Steel
1.4104 1.4404 tenifer 1.4104 1.4104
Adjusting screw
Chrome steel 316L tenifer Chrome steel Chrome steel
18
PTFE 15% glass PTFE 15% glass PTFE 15% glass PTFE 15% glass
with bushing
PTFE 15% glass PTFE 15% glass PTFE 15% glass PTFE 15% glass
1.0718 1.4404 1.0718 1.0718
19 Lock nut
Steel 316L Steel Steel
1.0460 / 0.7040 1.4404 1.0460 / 0.7040 1.0460 / 0.7040
40 Cap H2
SA 105 / Gr. 60-40-18 316L SA 105 / Gr. 60-40-18 SA 105 / Gr. 60-40-18
1.7102, 1.8159 1.4310 1.7102, 1.8159 1.7102, 1.8159
54 Spring
High temp. alloy steel Stainless steel High temp. alloy steel High temp. alloy steel
1.4401 1.4401 1.7709 1.4401
55 Stud
B8M B8M B16 B8M
1.4401 1.4401 1.7258 1.4401
56 Nut
8M 8M 7M 8M
1.4401 1.4401 1.4401 1.4401
57 Ball
316 316 316 316
Graphite / 1.4401 Graphite / 1.4401 Graphite / 1.4401 Graphite / 1.4401
60 Gasket
Graphite / 316 Graphite / 316 Graphite / 316 Graphite / 316
1.3541 1.4401 1.3541 1.3541
61 Ball
Hardened stainless steel 316 Hardened stainless steel Hardened stainless steel
1.4401 1.4401 1.4401 1.4401
66 Screw
B8M B8M B8M B8M
1.4404 1.4404 1.4404 1.4404
69 Needle bearing
316L 316L 316L 316L
1.4404 1.4404 1.4404 1.4404
73 Lock screw
316L 316L 316L 316L
1)
Stellited sealing surfaces please refer to page 102, Extended Catalog. LESER reserves also to use the nozzle material 1.4404 / 316L. 2) Valve sizes up to 6" x 8" 3) Valve sizes ≥ 6" x 10"
4)
Valve size 6 R 10, 8 T 10 and 6 Q 8 in high pressure design (Option code Z90). 5) Valve size 11/2 D 3, 11/2 E 3, 11/2 F 3, 6 R 10 and 8 T 10 with­out bonnet spacer.
6)
For valve sizes 6 Q 8, 6 R 10 and 8 T 10 in high pressure design: 1.4122 / chrome steel.

Please notice: Special materials:

- Modifications reserved by LESER. See API Alloy Concept page 80, Extended Catalog.
- If several materials are specified LESER defines the material.
- LESER can upgrade materials without notice.
- Every part can be replaced by other material acc. to customer specification.
9

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 Type 526
Article numbers
Type 526

Overview
Material WCB CF8M WC6 LCB WCB CF8M WC6 LCB WCB CF8M WC6 LCB
1.0619 1.4408 1.7357 1.0619 1.4408 1.7357 1.0619 1.4408 1.7357
Flange class 150 x 150 300L x 150 300 x 150
Valve size 1D2 1D2 1D2
5262. 5264. – 5263. Use 1 D 2 5262. 5264. 5267. 5263.
D 001¤ 010¤ 500¤ 300 x 150 002¤ 011¤ 006¤ 501¤

1E2 1E2 1E2

E 5262. 5264. – 5263. Use 1 E 2 5262. 5264. 5267. 5263.
015¤ 024¤ 505¤ 300 x 150 016¤ 025¤ 020¤ 506¤

1 1/2 F 2 1 1/2 F 2 1 1/2 F 2

F 5262. 5264. – 5263. 5262. 5264. – 5263. 5262. 5264. 5267. 5263.
029¤ 039¤ 510¤ 030¤ 040¤ 511¤ 031¤ 041¤ 035¤ 512¤

1 1/2 G 3 1 1/2 G 3 1 1/2 G 3

G 5262. 5264. – 5263. 5262. 5264. – 5263. 5262. 5264. 5267. 5263.
045¤ 110¤ 516¤ 046¤ 111¤ 517¤ 047¤ 112¤ 052¤ 518¤
Flange class 150 x 150 300L x 150 300 x 150
Valve size 1 1/2 H 3 1 1/2 H 3 2H3
5262. 5264. – 5263. 5262. 5264. – 5263. 5262. 5264. 5267. 5263.
H 142¤ 152¤ 523¤ 143¤ 153¤ 524¤ 144¤ 154¤ 148¤ 525¤

2J3 2J3 3J4

J 5262. 5264. – 5263. 5262. 5264. – 5263. 5262. 5264. 5267. 5263.
162¤ 196¤ 529¤ 163¤ 197¤ 530¤ 164¤ 198¤ 168¤ 531¤

3K4 3K4 3K4

K 5262. 5264. – 5263. Use 3 K 4 5262. 5264. 5267. 5263.
202¤ 211¤ 535¤ 300 x 150 203¤ 212¤ 207¤ 536¤
Flange class 150 x 150 300L x 150 300 x 150
Valve size 3L4 3L4 4L6
5262. 5264. – 5263. 5262. 5264. – 5263. 5262. 5264. 5267. 5263.
L 232¤ 242¤ 540¤ 233¤ 243¤ 541¤ 234¤ 244¤ 238¤ 542¤

4M6 4M6 4M6

M 5262. 5264. – 5263. Use 4 M 6 5262. 5264. 5267. 5263.
580¤ 587¤ 546¤ 300 x 150 581¤ 588¤ 584¤ 547¤

4N6 4N6 4N6

N 5262. 5264. – 5263. Use 4 N 6 5262. 5264. 5267. 5263.
590¤ 597¤ 550¤ 300 x 150 591¤ 598¤ 594¤ 551¤

4P6 4P6 4P6

P 5262. 5264. – 5263. 5262. 5264. – 5263. 5262. 5264. 5267. 5263.
645¤ 653¤ 554¤ 646¤ 654¤ 555¤ 647¤ 655¤ 650¤ 556¤

6Q8 6Q8 6Q8

Q 5262. 5264. – 5263. Use 6 Q 8 5262. 5264. 5267. 5263.
657¤ 662¤ 559¤ 300 x 150 658¤ 663¤ 660¤ 560¤

6R8 6R8 6 R 10
R 5262. 5264. – 5263. 5262. 5264. 5267. 5263. 5262. 5264. – 5263.
665¤ 671¤ 562¤ 666¤ 672¤ 669¤ 563¤ 667¤ 673¤ 564¤

8 T 10 8 T 10 8 T 10
T 5262. 5264. – 5263. Use 8 T 10 5262. 5264. 5267. 5263.
675¤ 678¤ 566¤ 300 x 150 676¤ 679¤ 677¤ 567¤

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 The-Safety-Valve.com

Type 526
Material WCB CF8M WC6 LCB WCB CF8M WC6 LCB WCB CF8M WC6 LCB WCB CF8M WC6 LCB
1.0619 1.4408 1.7357 1.0619 1.4408 1.7357 1.0619 1.4408 1.7357 1.0619 1.4408 1.7357
Flange class 600 x 150 900 x 300 1500 x 300 2500 x 300
Valve size 1D2 1 /2 D 2
1
1 /2 D 2
1
1 1/2 D 3
5262. 5264. 5267. 5263. Use 1 /2 D 2
1
5262. 5264. 5267. 5263. 5262. 5264. 5267. 5263.
D 003¤ 012¤ 007¤ 502¤ 1500 x 300 004¤ 013¤ 008¤ 503¤ 005¤ 014¤ 009¤ 504¤

1E2 1 1/2 E 2 1 1/2 E 2 1 1/2 E 3

E 5262. 5264. 5267. 5263. Use 1 /2 E 2
1
5262. 5264. 5267. 5263. 5262. 5264. 5267. 5263.
017¤ 026¤ 021¤ 507¤ 1500 x 300 018¤ 027¤ 022¤ 508¤ 019¤ 028¤ 023¤ 509¤

1 1/2 F 2 1 1/2 F 3 1 1/2 F 3 1 1/2 F 3

F 5262. 5264. 5267. 5263. Use 1 /2 F 3
1
5262. 5264. 5267. 5263. 5262. 5264. 5267. 5263.
032¤ 042¤ 036¤ 513¤ 1500 x 300 033¤ 043¤ 037¤ 514¤ 034¤ 044¤ 038¤ 515¤

1 1/2 G 3 1 1/2 G 3 2G3 2G3

G 5262. 5264. 5267. 5263. 5262. 5264. 5267. 5263. 5262. 5264. 5267. 5263. 5262. 5264. 5267. 5263.
048¤ 113¤ 053¤ 519¤ 049¤ 114¤ 054¤ 520¤ 050¤ 115¤ 055¤ 521¤ 051¤ 116¤ 056¤ 522¤
Flange class 600 x 150 900 x 150 1500 x 300
Valve size 2H3 2H3 2H3
5262. 5264. 5267. 5263. 5262. 5264. 5267. 5263. 5262. 5264. 5267. 5263.
H 145¤ 155¤ 149¤ 526¤ 146¤ 156¤ 150¤ 527¤ 147¤ 157¤ 151¤ 528¤

3J4 3J4 3J4

J 5262. 5264. 5267. 5263. 5262. 5264. 5267. 5263. 5262. 5264. 5267. 5263.
165¤ 199¤ 169¤ 532¤ 166¤ 200¤ 170¤ 533¤ 167¤ 201¤ 171¤ 534¤

3K4 3K6 3K6

K 5262. 5264. 5267. 5263. 5262. 5264. 5267. 5263. 5262. 5264. 5267. 5263.
204¤ 213¤ 208¤ 537¤ 205¤ 214¤ 209¤ 538¤ 206¤ 215¤ 210¤ 539¤
Flange class 600 x 150 900 x 150 1500 x 150
Valve size 4L6 4L6 4L6
5262. 5264. 5267. 5263. 5262. 5264. 5267. 5263. 5262. – 5267. 5263.
L 235¤ 245¤ 239¤ 543¤ 236¤ 246¤ 240¤ 544¤ 237¤ 241¤ 545¤

4M6 4M6
M 5262. 5264. 5267. 5263. 5262. – 5267. 5263.
582¤ 589¤ 585¤ 548¤ 583¤ 586¤ 549¤

4N6 4N6
N 5262. 5264. 5267. 5263. 5262. – 5267. 5263.
592¤ 599¤ 595¤ 552¤ 593¤ 596¤ 553¤

4P6 4P6
P 5262. 5264. 5267. 5263. 5262. – 5267. 5263.
648¤ 656¤ 651¤ 557¤ 649¤ 652¤ 558¤

6Q8
Q 5262. 5264. 5267. 5263.
659¤ 664¤ 661¤ 561¤ ¤)
Please add code for the required cap or lifting device.
6 R 10 ¤ Code for lifting device
R 5262. 5264. 5267. 5263. Lifting device H2 H3 H4 H3
668¤ 674¤ 670¤ 565¤ Bonnet closed closed closed open
8 T 10 WCB 1.0619,
2 3 4 5
T – – – – WC6 1.7357, LCB
CF8M 1.4408 2 – 4 –

11

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 Type 526
Dimensions
Metric units
Type 526

Safety valve Hmax. Hmax. Hmax.

a b s Hmax. with a b s Hmax. with a b s Hmax. with
dimensions [mm] bellows bellows bellows
Support brackets [mm] A B C D E A B C D E A B C D E
Flange rating class 150 x 150 300L x 150 300 x 150
Valve size 1D2 1D2 1D2
d0 [mm] 14.0 105 114 30 440 465 Please see 1 D 2 105 114 30 440 465
D A0 [mm2] 154 130 – Ø 14 132 16 300 x 150 130 – Ø 14 132 16
1E2 1E2 1E2
E d0 [mm] 14.0 105 114 30 440 465 Please see 1 E 2 105 114 30 440 465
A0 [mm ]2
154 130 – Ø 14 132 16 300 x 150 130 – Ø14 132 16
1 1/2 F 2 1 1/2 F 2 1 1/2 F 2
F d0 [mm] 18.0 124 121 32 536 561 124 121 32 536 561 124 152 35 536 561
A0 [mm2] 254 162 – Ø 14 148 16 162 – Ø 14 148 16 162 – Ø 14 148 16
1 1/2 G 3 1 1/2 G 3 1 1/2 G 3
G d0 [mm] 22.5 124 121 32 536 574 124 121 32 536 574 124 152 35 536 574
A0 [mm2] 398 162 – Ø 14 148 16 162 – Ø 14 148 16 162 – Ø 14 148 16
Flange rating class 150 x 150 300L x 150 300 x 150
Valve size 1 1/2 H 3 1 1/2 H 3 2H3
d0 [mm] 28.3 130 124 38 542 580 130 124 38 542 580 130 124 43 666 692
H A0 [mm2] 629 162 – Ø 14 155 16 162 – Ø 14 155 16 184 110 Ø 14 177 16
2J3 2J3 3J4
J d0 [mm] 36.0 137 124 49 673 722 137 124 49 673 722 184 181 49 786 824
A0 [mm ]2
1018 184 110 Ø 14 184 16 184 110 Ø 14 184 16 238 140 Ø 18 234 25
3K4 3K4 3K4
WCB, LCB, d0 [mm] 43.0 156 162 49 758 796 Please see 3 K 4 156 162 49 758 796
K CF8M (WC6) A0 [mm2] 1452 238 140 Ø 18 206 25 300 x 150 238 140 Ø 18 206 25

WC6

Flange rating class 150 x 150 300L x 150 300 x 150

Valve size 3L4 3L4 4L6
d0 [mm] 53.5 156 165 49 758 796 156 165 49 758 796 179 181 49 853 886
L A0 [mm ]2
2248 238 140 Ø 18 206 25 238 140 Ø 18 206 25 278 160 Ø 18 262 25
4M6 4M6 4M6
M d0 [mm] 60.3 178 184 48 852 885 Please see 4 M 6 178 184 48 852 885
A0 [mm2] 2856 278 160 Ø 18 260 25 300 x 150 278 160 Ø 18 260 25
4N6 4N6 4N6
N d0 [mm] 66.0 197 210 48 871 904 Please see 4 N 6 197 210 48 871 904
A0 [mm2] 3421 278 160 Ø 18 280 25 300 x 150 278 160 Ø 18 280 25
4P6 4P6 4P6
P d0 [mm] 80.0 181 229 48 855 888 181 229 48 855 888 225 254 62 1079 1138
A0 [mm2] 5027 278 160 Ø 18 262 25 278 160 Ø 18 262 25 370 210 Ø 18 306 25
6Q8 6Q8 6Q8
Q d0 [mm] 105.5 240 241 68 1120 1200 Please see 6 Q 8 240 241 68 1120 1200
A0 [mm2] 8742 370 210 Ø 18 346 25 300 x 150 370 210 Ø 18 346 25
6R8 6R8 6 R 10
R d0 [mm] 126.0 240 241 68 1120 1200 240 241 68 1120 1200 240 267 68 1426 1426
A0 [mm ] 12568
2
370 210 Ø 18 346 25 370 210 Ø 18 346 25 470 150 Ø 18 460 25
8 T 10 8 T 10 8 T 10
T d0 [mm] 161.5 276 279 62 1462 1462 Please see 8 T 10 276 279 62 1462 1462
A0 [mm2] 20485 470 150 Ø 18 497 25 300 x 150 470 150 Ø 18 497 25

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 The-Safety-Valve.com

d0 = Actual orifice diameter

Type 526
A 0 = Actual orifice area
Hmax. Hmax. Hmax. Hmax.
a b s Hmax. with a b s Hmax. with a b s Hmax. with a b s Hmax. with
bellows bellows bellows bellows
A B C D E A B C D E A B C D E A B C D E
600 x 150 900 x 300 1500 x 300 2500 x 300
1D2 1 1/2 D 2 1 1/2 D 2 1 1/2 D 3
105 114 30 440 465 Please see 1 /2 D 2
1 105 140 44 517 542 140 178 57 576 576
130 – Ø 14 132 16 1500 x 300 162 – Ø 14 129 16 162 – Ø 14 189 16
1E2 1 1/2 E 2 1 1/2 E 2 1 1/2 E 3
105 114 30 440 465 Please see 1 1/2 E 2 105 140 44 517 542 140 178 57 576 576
130 – Ø 14 132 16 1500 x 300 162 – Ø 14 129 16 162 – Ø 14 189 16
1 1/2 F 2 1 1/2 F 3 1 1/2 F 3 1 1/2 F 3
124 152 35 536 561 Please see 1 1/2 F 3 124 165 44 560 560 140 178 57 576 576
162 – Ø 14 148 16 1500 x 300 162 – Ø 14 174 16 162 – Ø 14 189 16
1 1/2 G 3 1 1/2 G 3 2G3 2G3
124 152 35 536 574 124 165 44 560 573 156 172 68 688 705 156 172 68 688 705
162 – Ø 14 148 16 162 – Ø 14 174 16 184 110 Ø 14 198 16 184 110 Ø 14 198 16
600 x 150 900 x 150 1500 x 300
2H3 2H3 2H3
154 162 56 691 717 154 162 56 691 717 154 162 56 691 717
184 110 Ø 14 202 16 184 110 Ø 14 202 16 184 110 Ø 14 202 16
3J4 3J4 3J4
184 181 49 786 824 184 181 65 786 824 184 181 65 786 824
238 140 Ø 18 234 25 238 140 Ø 18 234 25 238 140 Ø 18 234 25
3K4 3K6 3K6
184 181 49 786 824 198 216 67 880 880 197 216 65 879 879
238 140 Ø 18 234 25 278 160 Ø 18 288 25 278 160 Ø 18 287 25
156 162 49 758 796
238 140 Ø 18 206 25
600 x 150 900 x 150 1500 x 150
4L6 4L6 4L6
179 203 57 853 886 197 222 72 871 904 197 222 72 871 904
278 160 Ø 18 262 25 278 160 Ø 18 280 25 278 160 Ø 18 280 25
4M6 4M6
178 203 56 852 885 197 222 72 871 904
278 160 Ø 18 260 25 278 160 Ø 18 280 25
4N6 4N6
197 222 72 871 904 197 222 72 871 904
278 160 Ø 18 280 25 278 160 Ø 18 280 25
4P6 4P6
225 254 62 1079 1138 225 254 62 1079 1138
370 210 Ø 18 306 25 370 210 Ø 18 306 25
6Q8
240 241 68 11201) 12002)
370 210 Ø 18 346 25
6 R 10
240 267 68 1426 1426
470 150 Ø 18 460 25
–
–
– Support brackets Conventional design Balanced bellows design
1)
Type 526 high pressure design: 1202
2)
Type 526 high pressure design: 1282
13

4745_API_LWF_EN_Catalog.indd 13 28.03.18 10:00

 Type 526
Dimensions
US units
Type 526

Safety valve Hmax. Hmax. Hmax.

a b s Hmax. with a b s Hmax. with a b s Hmax. with
dimensions [inch] bellows bellows bellows
Support brackets [inch] A B C D E A B C D E A B C D E
Flange rating class 150 x 150 300L x 150 300 x 150
Valve size 1D2 1D2 1D2
d0 [inch] 0.551 4 1/8 4 1/2 1 3/16 17 5/16 18 5/16 Please see 1 D 2 4 1/8 4 1/2 1 3/16 17 5/16 18 5/16
D A0 [inch2] 0.239 5 1/8 – Ø 9/16 5 7/32 5
/8 300 x 150 5 1/8 – Ø 9/16 5 7/32 5
/8
1E2 1E2 1E2
E d0 [inch] 0.551 4 1/8 4 1/2 1 3/16 17 5/16 18 5/16 Please see 1 E 2 4 1/8 4 1/2 1 3/16 17 5/16 18 5/16
A0 [inch ] 0.239
2
5 /8
1
– Ø /16
9
5 /32
7 5
/8 300 x 150 5 /8
1
– Ø /169
5 7/32 5
/8
1 /2 F 2
1
1 /2 F 2
1
1 /2 F 2
1

F d0 [inch] 0.709 4 7/8 4 3/4 1 1/4 21 3/32 22 3/32 4 7/8 4 3/4 1 1/4 21 3/32 22 3/32 4 7/8 6 1 13/32 21 3/32 22 3/32
A0 [inch ] 0.394
2
6 /8
3
– Ø /16
9
5 /32
27 5
/8 6 /8
3
– Ø /169
5 /32
27 5
/8 6 /8
3
– Ø 14 5 27/32 5
/8
1 /2 G 3
1
1 /2 G 3
1
1 /2 G 3
1

G d0 [inch] 0.886 4 7/8 4 3/4 1 1/4 21 3/32 22 19/32 4 7/8 4 3/4 1 1/4 21 3/32 22 19/32 4 7/8 6 1 13/32 21 3/32 22 19/32
A0 [inch ] 0.616
2
6 /8
3
– Ø /16
9
5 /32
27 5
/8 6 /8
3
– Ø /169
5 /32
27 5
/8 6 /8
3
– Ø 9/16 5 27/32 5
/8
Flange rating class 150 x 150 300L x 150 300 x 150
Valve size 1 1/2 H 3 1 1/2 H 3 2H3
d0 [inch] 1.11 5 1/8 4 7/8 1 1/2 21 11/32 22 27/32 5 1/8 4 7/8 1 1/2 21 11/32 22 27/32 5 1/8 4 7/8 1 11/16 26 7/32 27 1/4
H A0 [inch2] 0.975 6 3/8 – Ø 9/16 6 3/32 5
/8 6 3/8 – Ø 9/16 6 3/32 5
/8 7 1/4 4 11/32 Ø 9/16 6 31/32 5
/8
2J3 2J3 3J4
J d0 [inch] 1.42 5 3/8 4 7/8 1 15/16 26 1/2 28 7/16 5 3/8 4 7/8 1 15/16 26 1/2 28 7/16 7 1/4 7 1/8 1 15/16 30 15/16 32 7/16
A0 [inch ]
2
1.58 7 /4
1
4 /32
11
Ø /16
9
7 /4
1 5
/8 7 /4
1
4 /32
11
Ø /169
7 /4
1 5
/8 9 /8
3
5 /2
1
Ø 23/32 9 7/32 31
/32
3K4 3K4 3K4
WCB, LCB, d0 [inch] 1.69 6 1/8 6 3/8 1 15/16 29 27/32 23 11/32 Please see 3 K 4 6 1/8 6 3/8 1 15/16 29 27/32 31 11/32
K CF8M (WC6) A0 [inch2] 2.25 9 /8
3
5 /2
1
Ø /3223
8 /32
3 31
/32 300 x 150 9 /8
3
5 /2
1
Ø 23/32 8 3/32 31
/32

WC6

Flange rating class 150 x 150 300L x 150 300 x 150

Valve size 3L4 3L4 4L6
d0 [inch] 2.11 6 1/8 6 1/2 1 15/16 29 27/32 31 11/12 6 1/8 6 1/2 1 15/16 29 27/32 31 11/12 7 1/6 7 1/8 1 15/16 33 19/32 34 7/8
L A0 [inch2] 3.48 9 3/8 5 1/2 Ø 23/32 8 3/32 31
/32 9 3/8 5 1/2 Ø 23/32 8 3/32 31
/32 10 15/16 6 5/16 Ø 23/32 10 5/16 31
/32
4M6 4M6 4M6
M d0 [inch] 2.37 7 7 1/4 1 7/8 33 17/32 34 27/32 Please see 4 M 6 7 7 1/4 1 7/8 33 17/32 34 27/32
A0 [inch ]
2
4.43 10 15
/16 6 /16
5
Ø /32 10 /4
23 1 31
/32 300 x 150 10 /16 6 /16
15 5
Ø /32 10 1/4
23 31
/32
4N6 4N6 4N6
N d0 [inch] 2.60 7 3/4 8 1/4 1 7/8 34 9/32 35 19/32 Please see 4 N 6 7 3/4 8 1/4 1 7/8 34 9/32 35 19/32
A0 [inch ]
2
5.30 10 15
/16 6 /16
5
Ø /3223
11 31
/32 300 x 150 10 /16 6 /16
15 5
Ø /3223
11 31
/32
4P6 4P6 4P6
P d0 [inch] 3.15 7 1/8 9 1 7/8 33 31/32 34 31/32 7 1/8 9 1 7/8 33 31/32 34 31/32 8 7/8 10 2 7/16 42 1/2 44 13/16
A0 [inch2] 7.79 10 15
/16 6 5/16 Ø 23/32 10 5/16 31
/32 10 15/16 6 5/16 Ø 23/32 10 5/16 31
/32 14 9/16 8 9/32 Ø 23/32 12 1/16 31
/32
6Q8 6Q8 6Q8
Q d0 [inch] 4.15 9 7/16 9 1/2 2 11/16 44 1/8 47 1/4 Please see 6 Q 8 9 7/16 9 1/2 2 11/16 44 1/8 47 1/4
A0 [inch2] 13.55 14 9/16 8 /32
9
Ø /32 13 /8
23 5 31
/32 300 x 150 14 /16
9
8 /32
9
Ø /32 13 /8
23 5 31
/32
6R8 6R8 6 R 10
R d0 [inch] 4.96 9 7/16 9 1/2 2 11/16 44 1/8 47 1/4 9 7/16 9 1/2 2 11/16 41 5/8 44 3/4 9 7/16 10 1/2 2 11/16 56 1/8 56 1/8
A0 [inch ] 19.33 14 /16
2 9
8 /32
9
Ø /32 13 /8
23 5 31
/32 14 /16
9
8 /32
9
Ø /32 13 /8
23 5 31
/32 18 /2
1
5 /32 Ø /32 18 /8
29 23 1 31
/32
8 T 10 8 T 10 8 T 10
T d0 [inch] 6.36 10 7/8 11 2 7/16 57 9/16 57 9/16 Please see 8 T 10 10 7/8 11 2 7/16 57 9/16 57 9/16
A0 [inch ] 31.75
2
18 /2
1
5 /32 Ø /32 19 /16
29 23 9 31
/32 300 x 150 18 /2
1
5 /32 Ø /32 19 9/16
29 23 31
/32

14

4745_API_LWF_EN_Catalog.indd 14 28.03.18 10:00

 The-Safety-Valve.com

d0 = Actual orifice diameter

A 0 = Actual orifice area

Type 526
Hmax. Hmax. Hmax. Hmax.
a b s Hmax. with a b s Hmax. with a b s Hmax. with a b s Hmax. with
bellows bellows bellows bellows
A B C D E A B C D E A B C D E A B C D E
600 x 150 900 x 300 1500 x 300 2500 x 300
1D2 1 1/2 D 2 1 1/2 D 2 1 1/2 D 3
4 1/8 4 1/2 1 3/16 17 5/16 18 5/16 Please see 1 /2 D 21 4 1/8 5 1/2 1 3/4 20 11/32 21 11/32 5 1/2 7 2 1/4 22 11/16 22 11/16
5 1/8 – Ø 9/16 5 7/32 5
/8 1500 x 300 6 3/8 – Ø 9/16 5 3/32 5
/8 6 3/8 – Ø 9/16 7 15/32 5
/8
1E2 1 1/2 E 2 1 1/2 E 2 1 1/2 E 3
4 1/8 4 1/2 1 3/16 17 5/16 18 5/16 Please see 1 1/2 E 2 4 1/8 5 1/2 1 3/4 20 11/32 21 11/32 5 1/2 7 2 1/4 22 11/16 22 11/16
5 /8
1
– Ø /16
9
5 /32
7 5
/8 1500 x 300 6 /8
3
– Ø /169
5 /32
3 5
/8 6 /8
3
– Ø /16 7 15/32
9 5
/8
1 /2 F 2
1
1 /2 F 3
1
1 /2 F 3
1
1 /2 F 3
1

4 7/8 6 1 13/32 21 3/32 22 3/32 Please see 1 1/2 F 3 4 7/8 6 1/2 1 3/4 22 1/16 22 1/16 5 1/2 7 2 1/4 22 11/16 22 11/16
6 /8
3
– Ø /16 5 /32
9 27 5
/8 1500 x 300 6 /8
3
– Ø /16 6 /32
9 27 5
/8 6 /8
3
– Ø /16 7 15/32
9 5
/8
1 /2 G 3
1
1 /2 G 3
1
2G3 2G3
4 7/8 6 1 13/32 21 3/32 22 19/32 4 7/8 6 1/2 1 3/4 22 1/16 22 9/16 6 1/8 6 3/4 2 11/16 27 3/32 27 3/4 6 1/8 6 3/4 2 11/16 27 3/32 27 3/4
6 /8
3
– Ø /16 5 /32
9 27 5
/8 6 /8
3
– Ø 14 6 /32
27 5
/8 7 /4
1
4 /32 Ø /16 7 /16
11 9 13 5
/8 7 /4
1
4 /32 Ø 9/16 7 13/16
11 5
/8
600 x 150 900 x 150 1500 x 300
2H3 2H3 2H3
6 1/16 6 3/8 2 3/16 27 7/32 28 7/32 6 1/16 6 3/8 2 3/16 27 7/32 28 7/32 6 1/16 6 3/8 2 3/16 27 7/32 28 7/32
7 1/4 4 11/32 Ø 9/16 7 15/16 5
/8 7 1/4 4 11/32 Ø 9/16 7 15/16 5
/8 7 1/4 4 11/32 Ø 9/16 7 15/16 5
/8
3J4 3J4 3J4
7 1/4 7 1/8 1 15/16 30 15/16 32 7/16 7 1/4 7 1/8 2 9/16 30 15/16 32 7/16 7 1/4 7 1/8 2 3/16 30 15/16 32 7/16
9 /8
3
5 /2
1
Ø /32 9 /32
23 7 31
/32 9 /8
3
5 /2
1
Ø /32 9 /32
23 7 31
/32 9 /8
3
5 /2
1
Ø 23/32 9 7/32 31
/32
3K4 3K6 3K6
7 1/4 7 1/8 1 15/16 30 15/16 32 7/16 7 13/16 8 1/2 2 9/16 34 21/32 34 21/32 7 3/4 8 1/2 2 9/16 34 19/32 34 19/32
9 /8
3
5 /2
1
Ø /32 9 /32
23 7 31
/32 10 /16 6 /16 Ø /32 11 /32
15 5 23 11 31
/32 10 /16 6 /16 Ø 23/32 10 15/16
15 5 31
/32
6 /8
1
6 /8
3
1 /16 29 /32 31 /32
15 27 11

9 3/8 5 1/2 Ø 23/32 8 3/32 31

/32
600 x 150 900 x 150 1500 x 150
4L6 4L6 4L6
7 1/16 8 2 1/4 33 19/32 34 7/8 7 3/4 8 3/4 2 3/4 34 9/32 35 19/32 7 3/4 8 3/4 2
/34 34 9/32 35 19/32
10 /16 6 /16 Ø /32 10 /16
15 5 23 15 31
/32 10 /16 6 /16 Ø /32
15 5 23
11 31
/32 10 /16 6 /16 Ø /32
15 5 23
11 31
/32
4M6 4M6
7 8 2 3/16 33 17/32 34 27/32 7 3/4 8 3/4 2 3/4 34 9/32 35 19/32
10 /16 6 /16 Ø /32 10 /4
15 5 23 1 31
/32 10 /16 6 /16 Ø /32
15 5 23
11 31
/32
4N6 4N6
7 3/4 8 3/4 2 3/4 34 9/32 35 19/32 7 3/4 8 3/4 2 3/4 34 9/32 35 19/32
10 /16 6 /16 Ø /32
15 5 23
11 31
/32 10 /16 6 /16 Ø /32
15 5 23
11 31
/32
4P6 4P6
8 7/8 10 2 7/16 42 1/2 44 13/16 8 7/8 10 2 7/16 42 1/2 44 13/16
14 9/16 8 9/32 Ø 23/32 12 1/16 31
/32 14 9/16 8 9/32 Ø 23/32 12 1/16 31
/32
6Q8
9 7/16 9 1/2 2 11/16 44 1/81) 47 1/42)
14 /16 8 /32 Ø 23/32 13 5/8
9 9 31
/32
6 R 10
9 7/16 10 1/2 2 11/16 56 1/8 56 1/8
18 /2 5 29/32 Ø 23/32 18 1/8
1 31
/32
–
–
– Support brackets Conventional design Balanced bellows design
1)
Type 526 high pressure design: 47 5/16
2)
Type 526 high pressure design: 50 1/2
15

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 Type 526
Weigths
Type 526

Metric units
Bonnet all
Lifting device all
Flange class 150 x 150 300L x 150 300 x 150 600 x 150 900 x 300 1500 x 300 2500 x 300
Valve size 1D2 1D2 1D2 1D2 1 /2 D 2
1
1 /2 D 2
1
1 1/2 D 3
Weight [kg] 17.3 17.3 17.3 17.3 31.1 31.1 41.8
D with bellows [kg] 18.4 18.4 18.4 18.4 33.1 33.1 44.6
1E2 1E2 1E2 1E2 1 1/2 E 2 1 1/2 E 2 1 1/2 E 3
E Weight [kg] 17.3 17.3 17.3 17.3 31.1 31.1 41.8
with bellows [kg] 18.4 18.4 18.4 18.4 33.1 33.1 44.6
1 1/2 F 2 1 1/2 F 2 1 1/2 F 2 1 1/2 F 2 1 1/2 F 3 1 1/2 F 3 1 1/2 F 3
F Weight [kg] 30.6 30.6 32.5 32.5 36.3 36.3 41.8
with bellows [kg] 33.1 33.1 35.0 35.0 38.6 38.6 44.6
1 /2 G 3
1
1 /2 G 3
1
1 /2 G 3
1
1 /2 G 3
1
1 /2 G 3
1
2G3 2G3
G Weight [kg] 30.6 30.6 32.5 32.5 36.3 69.9 69.9
with bellows [kg] 33.1 33.1 35.0 35.0 38.6 72.5 72.5
Flange class 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150 1500 x 300
Valve size 1 1/2 H 3 1 1/2 H 3 2H3 2H3 2H3 2H3
Weight [kg] 30.6 30.6 44.6 62.2 62.2 62.2
H with bellows [kg] 33.1 33.1 48.4 65.3 65.3 65.3
2J3 2J3 3J4 3J4 3J4 3J4
J Weight [kg] 44.6 44.6 77.7 77.7 100.2 100.2
with bellows [kg] 48.4 48.4 83.2 83.2 105.7 105.7
3K4 3K4 3K4 3K4 3K6 3K6
Other WC6
K Weight [kg] 70.1 70.1 70.1 77.7 70.1 127.5 127.5
with bellows [kg] 75.7 75.7 75.7 83.2 75.7 134.1 134.1
Flange class 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150 1500 x 150
Valve size 3L4 3L4 4L6 4L6 4L6 4L6
Weight [kg] 70.1 70.1 112.2 122.0 134.1 127.5
L with bellows [kg] 75.7 75.7 118.8 128.6 140.7 134.1
4M6 4M6 4M6 4M6 4M6
M Weight [kg] 112.1 112.1 112.1 122.0 134.1
with bellows [kg] 118.7 118.7 118.7 128.6 140.7
4N6 4N6 4N6 4N6 4N6
N Weight [kg] 128.6 128.6 128.6 134.1 134.1
with bellows [kg] 135.2 135.2 135.2 140.7 140.7
4P6 4P6 4P6 4P6 4P6
P Weight [kg] 107.7 107.7 164.0 164.0 164.0
with bellows [kg] 114.8 114.8 172.0 172.0 172.0
6Q8 6Q8 6Q8 6Q8
Q Weight [kg] 221.0 221.0 221.0 221.0
with bellows [kg] 230.0 230.0 230.0 230.0
6R8 6R8 6 R 10 6 R 10
R Weight [kg] 221.0 221.0 277.0 277.0
with bellows [kg] 230.0 230.0 288.0 288.0
8 T 10 8 T 10 8 T 10
T Weight [kg] 287.0 287.0 287.0
with bellows [kg] 298.0 298.0 298.0

16

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 The-Safety-Valve.com

Type 526
Weigths

Type 526
US units
Bonnet all
Lifting device all
Flange class 150 x 150 300L x 150 300 x 150 600 x 150 900 x 300 1500 x 300 2500 x 300
Valve size 1D2 1D2 1D2 1D2 1 /2 D 2
1
1 /2 D 2
1
1 1/2 D 3
Weight [lbs] 38.1 38.1 38.1 38.1 68.6 68.6 92.2
D with bellows [lbs] 40.6 40.6 40.6 40.6 73.0 73.0 98.3
1E2 1E2 1E2 1E2 1 1/2 E 2 1 1/2 E 2 1 1/2 E 3
E Weight [lbs] 38.1 38.1 38.1 38.1 68.6 68.6 92.2
with bellows [lbs] 40.6 40.6 40.6 40.6 73.0 73.0 98.3
1 1/2 F 2 1 1/2 F 2 1 1/2 F 2 1 1/2 F 2 1 1/2 F 3 1 1/2 F 3 1 1/2 F 3
F Weight [lbs] 67.5 67.5 71.7 71.7 80.0 80.0 92.2
with bellows [lbs] 73.0 73.0 77.2 77.2 85.1 85.1 98.3
1 /2 G 3
1
1 /2 G 3
1
1 /2 G 3
1
1 /2 G 3
1
1 /2 G 3
1
2G3 2G3
G Weight [lbs] 67.5 67.5 71.7 71.7 80.0 154.1 154.1
with bellows [lbs] 73.0 73.0 77.2 77.2 85.0 159.9 159.9
Flange class 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150 1500 x 300
Valve size 1 1/2 H 3 1 1/2 H 3 2H3 2H3 2H3 2H3
Weight [lbs] 67.5 67.5 98.3 137.2 137.2 137.2
H with bellows [lbs] 73.0 73.0 106.7 144.0 144.0 144.0
2J3 2J3 3J4 3J4 3J4 3J4
J Weight [lbs] 98.3 98.3 171.3 171.3 220.9 220.9
with bellows [lbs] 106.7 106.7 183.5 183.5 233.1 233.1
3K4 3K4 3K4 3K4 3K6 3K6
Other WC6
K Weight [lbs] 154.6 154.6 154.6 171.3 154.6 281.1 281.1
with bellows [lbs] 166.9 166.9 166.9 183.5 166.9 295.7 295.7
Flange class 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150 1500 x 150
Valve size 3L4 3L4 4L6 4L6 4L6 4L6
Weight [lbs] 154.6 154.6 247.4 269.0 295.7 281.1
L with bellows [lbs] 166.9 166.9 262.0 283.6 310.2 295.7
4M6 4M6 4M6 4M6 4M6
M Weight [lbs] 247.2 247.2 247.2 269.0 295.7
with bellows [lbs] 261.7 261.7 261.7 283.6 310.2
4N6 4N6 4N6 4N6 4N6
N Weight [lbs] 283.6 283.6 283.6 295.7 295.7
with bellows [lbs] 298.1 298.1 298.1 310.2 310.2
4P6 4P6 4P6 4P6 4P6
P Weight [lbs] 237.5 237.5 361.6 361.6 361.6
with bellows [lbs] 253.1 253.1 379.2 379.2 379.2
6Q8 6Q8 6Q8 6Q8
Q Weight [lbs] 487.3 487.3 487.3 487.3
with bellows [lbs] 507.2 507.2 507.2 507.2
6R8 6R8 6 R 10 6 R 10
R Weight [lbs] 487.3 487.3 610.8 610.8
with bellows [lbs] 507.2 507.2 635.0 635.0
8 T 10 8 T 10 8 T 10
T Weight [lbs] 632.8 632.8 632.8
with bellows [lbs] 657.1 657.1 657.1

17

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 Type 526
Orifice D
Pressure temperature ratings

Metric units
Valve size 1D2 1D2 1D2 1D2 1 1/2 D 2 1 1/2 D 2 1 1/2 D 3
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 300 1500 x 300 2500 x 300
D Actual Orifice diameter d0 [mm] 14.0 14.0 14.0 14.0 14.0 14.0 14.0
Actual Orifice area A0 [mm2] 154 154 154 154 154 154 154
Minimum set pressure [bar] S/G/L 0.3 0.3 0.3 0.3 5.0 5.0 18.5
Minimum set pressure [bar] S/G 3.5 3.5 3.5 11.0 24.0 24.0 24.0
Balanced bellows Inconel [bar] L 3.5 3.5 3.5 11.0 11.0 11.0 11.0
Body material: WCB 1.0619 Pressure range p [bar] S/G/L
Article numbers 5262.001¤ 5262.002¤ 5262.003¤ 5262.004¤ 5262.005¤
Maximum -29 to 38 °C 19.7 51.0 102.1 255.5 413.8
set pressure 232 °C 12.8 42.4 85.2 212.4 354.1
427 °C 5.5 Use 1 D 2 28.3 56.9 Use 1 1/2 D 2 142.1 236.6
Outlet pressure limit 300 x 150 1500 x 300
Conventional design 19.7 19.7 19.7 41.4 51.0

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 34.5 34.5

Body material: CF8M 1.4408 Pressure range p [bar] S/G/L

Article numbers 5264.010¤ 5264.011¤ 5264.012¤ 5264.013¤ 5264.014¤
Maximum -268 to -60 °C 19.0 49.7 99.3 248.3 275.9
set pressure -59 to -29 °C 19.0 49.7 99.3 248.3 413.8
-28 to 38 °C 19.0 49.7 99.3 248.3 413.8
232 °C 12.4 34.1 67.2 171.0 284.8
Use 1 D 2 Use 1 1/2 D 2
427 °C 5.5 300 x 150
29.0 58.3 1500 x 300
145.5 242.8
538 °C 1.4 24.1 48.3 120.7 201.0
Outlet pressure limit
Conventional design 19.0 19.0 19.0 41.4 49.7

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 34.5 34.5

Body material: WC6 1.7357 Pressure range p [bar] S/G/L

Article numbers – 5267.006¤ 5267.007¤ 5267.008¤ 5267.009¤
Maximum 427 °C – 35.2 70.0 175.2 291.7
set pressure 538 °C – 14.8 29.7 74.5 124.1
Use 1 D 2 Use 1 1/2 D 2
Outlet pressure limit 300 x 150 1500 x 300
Conventional design – 19.7 19.7 41.4 51.0

Outlet pressure limit

Balanced bellows design – 15.9 15.9 34.5 34.5

Body material: LCB Pressure range p [bar] S/G/L

Article numbers 5263.500¤ 5263.501¤ 5263.502¤ 5263.503¤ 5263.504¤
Maximum -46 to 38 °C 18.4 48.0 96.0 240.1 400.1
set pressure 200 °C 13.8 42.5 85.1 212.7 354.4
343 °C 8.4 Use 1 D 2 36.4 72.8 Use 1 1/2 D 2 182.0 303.3
Outlet pressure limit 300 x 150 1500 x 300
Conventional design 18.4 18.4 18.4 41.4 48.0

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 34.5 34.5

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

18

4745_API_LWF_EN_Catalog.indd 18 28.03.18 10:00

 The-Safety-Valve.com

Type 526
Orifice D
Pressure temperature ratings

US units
Valve size 1D2 1D2 1D2 1D2 1 1/2 D 2 1 1/2 D 2 1 1/2 D 3
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 300 1500 x 300 2500 x 300
Actual Orifice diameter d0 [inch] 0.551 0.551 0.551 0.551 0.551 0.551 0.551
D
Actual Orifice area A0 [inch2] 0.239 0.239 0.239 0.239 0.239 0.239 0.239
Minimum set pressure [psig] S/G/L 4.0 4.0 4.0 4.0 73.0 73.0 268.0
Minimum set pressure [psig] S/G 50.8 50.8 50.8 159.5 348.0 348.0 348.0
Balanced bellows Inconel [psig] L 50.8 50.8 50.8 159.5 159.5 159.5 159.5
Body material: WCB 1.0619 Pressure range p [psig] S/G/L
Article numbers 5262.001¤ 5262.002¤ 5262.003¤ 5262.004¤ 5262.005¤
Maximum -20 to 100 °F 285 740 1480 3705 6000
set pressure 450 °F 185 615 1235 3080 5135
800 °F 80 Use 1 D 2 410 825 Use 1 1/2 D 2 2060 3430
Outlet pressure limit 300 x 150 1500 x 300
Conventional design 285 285 285 600 740

Outlet pressure limit

Balanced bellows design 230 230 230 500 500

Body material: CF8M 1.4408 Pressure range p [psig] S/G/L

Article numbers 5264.010¤ 5264.011¤ 5264.012¤ 5264.013¤ 5264.014¤
Maximum -450 to -76 °F 275 720 1440 3600 4000
set pressure -75 to -21 °F 275 720 1440 3600 6000
-20 to 100 °F 275 720 1440 3600 6000
450 °F 180 495 975 2480 4130
Use 1 D 2 Use 1 1/2 D 2
800 °F 80 300 x 150
420 845 1500 x 300
2110 3520
1000 °F 20 350 700 1750 2915
Outlet pressure limit
Conventional design 275 275 275 600 720

Outlet pressure limit

Balanced bellows design 230 230 230 500 500

Body material: WC6 1.7357 Pressure range p [psig] S/G/L

Article numbers – 5267.006¤ 5267.007¤ 5267.008¤ 5267.009¤
Maximum 800 °F – 510 1015 2540 4230
set pressure 1000 °F – 215 430 1080 1800
Use 1 D 2 Use 1 1/2 D 2
Outlet pressure limit 300 x 150 1500 x 300
Conventional design – 285 285 600 740

Outlet pressure limit

Balanced bellows design – 230 230 500 500

Body material: LCB Pressure range p [psig] S/G/L

Article numbers 5263.500¤ 5263.501¤ 5263.502¤ 5263.503¤ 5263.504¤
Maximum -50 to 100 °F 265 695 1395 3480 5805
set pressure 400 °F 200 615 1230 3075 5125
650 °F 125 Use 1 D 2 535 1065 Use 1 1/2 D 2 2665 4440
Outlet pressure limit 300 x 150 1500 x 300
Conventional design 265 265 265 600 695

Outlet pressure limit

Balanced bellows design 230 230 230 500 500

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

19

4745_API_LWF_EN_Catalog.indd 19 28.03.18 10:00

 Type 526
Orifice E
Pressure temperature ratings

Metric units
Valve size 1E2 1E2 1E2 1E2 1 1/2 E 2 1 1/2 E 2 1 1/2 E 3
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 300 1500 x 300 2500 x 300
Actual Orifice diameter d0 [mm] 14.0 14.0 14.0 14.0 14.0 14.0 14.0
Actual Orifice area A0 [mm2] 154 154 154 154 154 154 154
Minimum set pressure [bar] S/G/L 0.3 0.3 0.3 0.3 5.0 5.0 18.5
E Minimum set pressure [bar] S/G 3.5 3.5 3.5 11.0 24.0 24.0 24.0
Balanced bellows Inconel [bar] L 3.5 3.5 3.5 11.0 11.0 11.0 11.0
Body material: WCB 1.0619 Pressure range p [bar] S/G/L
Article numbers 5262.015¤ 5262.016¤ 5262.017¤ 5262.018¤ 5262.019¤
Maximum -29 to 38 °C 19.7 51.0 102.1 255.5 413.8
set pressure 232 °C 12.8 42.4 85.2 212.4 354.1
427 °C 5.5 Use 1 E 2 28.3 56.9 Use 1 1/2 E 2 142.1 236.6
Outlet pressure limit 300 x 150 1500 x 300
Conventional design 19.7 19.7 19.7 41.4 51.0

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 34.5 34.5

Body material: CF8M 1.4408 Pressure range p [bar] S/G/L

Article numbers 5264.024¤ 5264.025¤ 5264.026¤ 5264.027¤ 5264.028¤
Maximum -268 to -60 °C 19.0 49.7 99.3 248.3 275.9
set pressure -59 to -29 °C 19.0 49.7 99.3 248.3 413.8
-28 to 38 °C 19.0 49.7 99.3 248.3 413.8
232 °C 12.4 34.1 67.2 171.0 284.8
Use 1 E 2 Use 1 1/2 E 2
427 °C 5.5 300 x 150
29.0 58.3 1500 x 300
145.5 242.8
538 °C 1.4 24.1 48.3 120.7 201.0
Outlet pressure limit
Conventional design 19.0 19.0 19.0 41.4 49.7

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 34.5 34.5

Body material: WC6 1.7357 Pressure range p [bar] S/G/L

Article numbers – 5267.020¤ 5267.021¤ 5267.022¤ 5267.023¤
Maximum 427 °C – 35.2 70.0 175.2 291.7
set pressure 538 °C – 14.8 29.7 74.5 124.1
Use 1 E 2 Use 1 1/2 E 2
Outlet pressure limit 300 x 150 1500 x 300
Conventional design – 19.7 19.7 41.4 51.0

Outlet pressure limit

Balanced bellows design – 15.9 15.9 34.5 34.5

Body material: LCB Pressure range p [bar] S/G/L

Article numbers 5263.505¤ 5263.506¤ 5263.507¤ 5263.508¤ 5263.509¤
Maximum -46 to 38 °C 18.4 48.0 96.0 240.1 400.1
set pressure 200 °C 13.8 42.5 85.1 212.7 354.4
343 °C 8.4 Use 1 E 2 36.4 72.8 Use 1 1/2 E 2 182.0 303.3
Outlet pressure limit 300 x 150 1500 x 300
Conventional design 18.4 18.4 18.4 41.4 48.0

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 34.5 34.5

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

20

4745_API_LWF_EN_Catalog.indd 20 28.03.18 10:00

 The-Safety-Valve.com

Type 526
Orifice E
Pressure temperature ratings

US units
Valve size 1E2 1E2 1E2 1E2 1 1/2 E 2 1 1/2 E 2 1 1/2 E 3
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 300 1500 x 300 2500 x 300
Actual Orifice diameter d0 [inch] 0.551 0.551 0.551 0.551 0.551 0.551 0.551
Actual Orifice area A0 [inch2] 0.239 0.239 0.239 0.239 0.239 0.239 0.239
Minimum set pressure [psig] S/G/L 4.0 4.0 4.0 4.0 73.0 73.0 268.0
Minimum set pressure [psig] S/G 50.8 50.8 50.8 159.5 348.0 348.0 348.0 E
Balanced bellows Inconel [psig] L 50.8 50.8 50.8 159.5 159.5 159.5 159.5
Body material: WCB 1.0619 Pressure range p [psig] S/G/L
Article numbers 5262.015¤ 5262.016¤ 5262.017¤ 5262.018¤ 5262.019¤
Maximum -20 to 100 °F 285 740 1480 3705 6000
set pressure 450 °F 185 615 1235 3080 5135
800 °F 80 Use 1 E 2 410 825 Use 1 1/2 E 2 2060 3430
Outlet pressure limit 300 x 150 1500 x 300
Conventional design 285 285 285 600 740

Outlet pressure limit

Balanced bellows design 230 230 230 500 500

Body material: CF8M 1.4408 Pressure range p [psig] S/G/L

Article numbers 5264.024¤ 5264.025¤ 5264.026¤ 5264.027¤ 5264.028¤
Maximum -450 to -76 °F 275 720 1440 3600 4000
set pressure -75 to -21 °F 275 720 1440 3600 6000
-20 to 100 °F 275 720 1440 3600 6000
450 °F 180 495 975 2480 4130
Use 1 E 2 Use 1 1/2 E 2
800 °F 80 300 x 150
420 845 2110 3520
1500 x 300
1000 °F 20 350 700 1750 2915
Outlet pressure limit
Conventional design 275 275 275 600 720

Outlet pressure limit

Balanced bellows design 230 230 230 500 500

Body material: WC6 1.7357 Pressure range p [psig] S/G/L

Article numbers – 5267.020¤ 5267.021¤ 5267.022¤ 5267.023¤
Maximum 800 °F – 510 1015 2540 4230
set pressure 1000 °F – 215 430 1080 1800
Use 1 E 2 Use 1 1/2 E 2
Outlet pressure limit 300 x 150 1500 x 300
Conventional design – 285 285 600 740

Outlet pressure limit

Balanced bellows design – 230 230 500 500

Body material: LCB Pressure range p [psig] S/G/L

Article numbers 5263.505¤ 5263.506¤ 5263.507¤ 5263.508¤ 5263.509¤
Maximum -50 to 100 °F 265 695 1395 3480 5805
set pressure 400 °F 200 615 1230 3075 5125
650 °F 125 Use 1 E 2 535 1065 Use 1 1/2 E 2 2665 4440
Outlet pressure limit 300 x 150 1500 x 300
Conventional design 265 265 265 600 695

Outlet pressure limit

Balanced bellows design 230 230 230 500 500

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

21

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 Type 526
Orifice F
Pressure temperature ratings

Metric units
Valve size 1 1/2 F 2 1 1/2 F 2 1 1/2 F 2 1 1/2 F 2 1 1/2 F 3 1 1/2 F 3 1 1/2 F 3
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 300 1500 x 300 2500 x 300
Actual Orifice diameter d0 [mm] 18.0 18.0 18.0 18.0 18.0 18.0 18.0
Actual Orifice area A0 [mm2] 254 254 254 254 254 254 254
Minimum set pressure [bar] S/G/L 0.3 0.3 0.3 0.3 0.3 0.3 0.3
Minimum set pressure [bar] S/G 1.7 1.7 1.7 12.0 12.0 12.0 13.5
Balanced bellows Inconel [bar] L 2.5 2.5 2.5 8.2 8.2 8.2 8.2
Body material: WCB 1.0619 Pressure range p [bar] S/G/L
Article numbers 5262.029¤ 5262.030¤ 5262.031¤ 5262.032¤ 5262.033¤ 5262.034¤
F
Maximum -29 to 38 °C 19.7 19.7 51.0 102.1 255.5 344.8
set pressure 232 °C 12.8 19.7 42.4 85.2 212.4 344.8
427 °C 5.5 19.7 28.3 56.9 Use 1 1/2 F 3 142.1 236.6
Outlet pressure limit 1500 x 300
Conventional design 19.7 19.7 19.7 19.7 51.0 51.0

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 15.9 34.5 34.5

Body material: CF8M 1.4408 Pressure range p [bar] S/G/L

Article numbers 5264.039¤ 5264.040¤ 5264.041¤ 5264.042¤ 5264.043¤ 5264.044¤
Maximum -268 to -60 °C 19.0 19.0 49.7 99.3 151.7 234.5
set pressure -59 to -29 °C 19.0 19.0 49.7 99.3 248.3 344.8
-28 to 38 °C 19.0 19.0 49.7 99.3 248.3 344.8
232 °C 12.4 19.0 34.1 67.2 171.0 284.8
Use 1 1/2 F 3
427 °C 5.5 19.0 29.0 58.3 1500 x 300
145.5 242.8
538 °C 1.4 19.0 24.1 48.3 120.7 201.0
Outlet pressure limit
Conventional design 19.0 19.0 19.0 19.0 49.7 49.7

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 15.9 34.5 34.5

Body material: WC6 1.7357 Pressure range p [bar] S/G/L

Article numbers – – 5267.035¤ 5267.036¤ 5267.037¤ 5267.038¤
Maximum 427 °C – – 35.2 70.0 175.2 291.7
set pressure 538 °C – – 14.8 29.7 74.5 124.1
Use 1 1/2 F 3
Outlet pressure limit 1500 x 300
Conventional design – – 19.7 19.7 51.0 51.0

Outlet pressure limit

Balanced bellows design – – 15.9 15.9 34.5 34.5

Body material: LCB Pressure range p [bar] S/G/L

Article numbers 5263.510¤ 5263.511¤ 5263.512¤ 5263.513¤ 5263.514¤ 5263.515¤
Maximum -46 to 38 °C 18.4 18.4 48.0 96.0 240.1 344.8
set pressure 200 °C 13.8 18.4 42.5 85.1 212.7 344.8
343 °C 8.4 18.4 36.4 72.8 Use 1 1/2 F 3 182.0 303.3
Outlet pressure limit 1500 x 300
Conventional design 18.4 18.4 18.4 18.4 48.0 48.0

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 15.9 34.5 34.5
¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

22

4745_API_LWF_EN_Catalog.indd 22 28.03.18 10:00

 The-Safety-Valve.com

Type 526
Orifice F
Pressure temperature ratings

US units
Valve size 1 1/2 F 2 1 1/2 F 2 1 1/2 F 2 1 1/2 F 2 1 1/2 F 3 1 1/2 F 3 1 1/2 F 3
FFlange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 300 1500 x 300 2500 x 300
Actual Orifice diameter d0 [inch] 0.709 0.709 0.709 0.709 0.709 0.709 0.709
Actual Orifice area A0 [inch2] 0.394 0.394 0.394 0.394 0.394 0.394 0.394
Minimum set pressure [psig] S/G/L 4.0 4.0 4.0 4.0 4.0 4.0 4.0
Minimum set pressure [psig] S/G 24.6 24.6 24.6 174.0 174.0 174.0 159.0
Balanced bellows Inconel [psig] L 36.3 36.3 36.3 118.9 118.9 118.9 118.9
Body material: WCB 1.0619 Pressure range p [psig] S/G/L
Article numbers 5262.029¤ 5262.030¤ 5262.031¤ 5262.032¤ 5262.033¤ 5262.034¤
F
Maximum -20 to 100 °F 285 285 740 1480 3705 5000
set pressure 450 °F 185 285 615 1235 3080 5000
800 °F 80 285 410 825 Use 1 1/2 F 3 2060 3430
Outlet pressure limit 1500 x 300
Conventional design 285 285 285 285 740 740

Outlet pressure limit

Balanced bellows design 230 230 230 230 500 500

Body material: CF8M 1.4408 Pressure range p [psig] S/G/L

Article numbers 5264.039¤ 5264.040¤ 5264.041¤ 5264.042¤ 5264.043¤ 5264.044¤
Maximum -450 to -76 °F 275 275 720 1440 2200 3400
set pressure -75 to -21 °F 275 275 720 1440 3600 5000
-20 to 100 °F 275 275 720 1440 3600 5000
450 °F 180 275 495 975 2480 4130
Use 1 1/2 F 3
800 °F 80 275 420 845 1500 x 300
2110 3520
1000 °F 20 275 350 700 1750 2915
Outlet pressure limit
Conventional design 275 275 275 275 720 720

Outlet pressure limit

Balanced bellows design 230 230 230 230 500 500

Body material: WC6 1.7357 Pressure range p [psig] S/G/L

Article numbers – – 5267.035¤ 5267.036¤ 5267.037¤ 5267.038¤
Maximum 800 °F – – 510 1015 2540 4230
set pressure 1000 °F – – 215 430 1080 1800
Use 1 1/2 F 3
Outlet pressure limit 1500 x 300
Conventional design – – 285 285 740 740

Outlet pressure limit

Balanced bellows design – – 230 230 500 500

Body material: LCB Pressure range p [psig] S/G/L

Article numbers 5263.510¤ 5263.511¤ 5263.512¤ 5263.513¤ 5263.514¤ 5263.515¤
Maximum -50 to 100 °F 265 265 695 1395 3480 5000
set pressure 400 °F 200 265 615 1230 3075 5000
650 °F 125 265 535 1065 Use 1 1/2 F 3 2665 4440
Outlet pressure limit 1500 x 300
Conventional design 265 265 265 265 695 695

Outlet pressure limit

Balanced bellows design 230 230 230 230 500 500
¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

23

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 Type 526
Orifice G
Pressure temperature ratings

Metric units
Valve size 1 1/2 G 3 1 1/2 G 3 1 1/2 G 3 1 1/2 G 3 1 1/2 G 3 2G3 2G3
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 300 1500 x 300 2500 x 300
Actual Orifice diameter d0 [mm] 22.5 22.5 22.5 22.5 22.5 22.5 22.5
Actual Orifice area A0 [mm2] 398 398 398 398 398 398 398
Minimum set pressure [bar] S/G/L 0.21) 0.21) 0.21) 0.21) 0.21) 5.0 5.0
Minimum set pressure [bar] S/G 3.4 3.4 3.4 9.2 9.2 9.2 9.2
Balanced bellows Inconel [bar] L 3.2 3.2 3.2 18.5 18.5 18.5 18.5
Body material: WCB 1.0619 Pressure range p [bar] S/G/L
Article numbers 5262.045¤ 5262.046¤ 5262.047¤ 5262.048¤ 5262.049¤ 5262.050¤ 5262.051¤
Maximum -29 to 38 °C 19.7 19.7 51.0 102.1 153.1 255.5 255.5
set pressure 232 °C 12.8 19.7 42.4 85.2 127.2 212.4 255.5
427 °C 5.5 19.7 28.3 56.9 85.2 142.1 236.6
G Outlet pressure limit
Conventional design 19.7 19.7 19.7 19.7 51.0 51.0 51.0

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 15.9 32.4 32.4 32.4

Body material: CF8M 1.4408 Pressure range p [bar] S/G/L

Article numbers 5264.110¤ 5264.111¤ 5264.112¤ 5264.113¤ 5264.114¤ 5264.115¤ 5264.116¤
Maximum -268 to -60 °C 19.0 19.0 49.7 99.3 149.0 169.0 179.3
set pressure -59 to -29 °C 19.0 19.0 49.7 99.3 149.0 248.3 255.5
-28 to 38 °C 19.0 19.0 49.7 99.3 149.0 248.3 255.5
232 °C 12.4 19.0 34.1 67.2 102.4 171.0 255.5
427 °C 5.5 19.0 29.0 58.3 87.2 145.5 242.8
538 °C 1.4 19.0 24.1 48.3 72.4 120.7 201.0
Outlet pressure limit
Conventional design 19.0 19.0 19.0 19.0 49.7 49.7 49.7

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 15.9 32.4 32.4 32.4

Body material: WC6 1.7357 Pressure range p [bar] S/G/L

Article numbers – – 5267.052¤ 5267.053¤ 5267.054¤ 5267.055¤ 5267.056¤
Maximum 427 °C – – 35.2 70.0 105.2 175.2 255.5
set pressure 538 °C – – 14.8 29.7 44.8 74.5 124.1
Outlet pressure limit
Conventional design – – 19.7 19.7 51.0 51.0 51.0

Outlet pressure limit

Balanced bellows design – – 15.9 15.9 32.4 32.4 32.4

Body material: LCB Pressure range p [bar] S/G/L

Article numbers 5263.516¤ 5263.517¤ 5263.518¤ 5263.519¤ 5263.520¤ 5263.521¤ 5263.522¤
Maximum -46 to 38 °C 18.4 18.4 48.0 96.0 144.1 240.1 255.5
set pressure 200 °C 13.8 18.4 42.5 85.1 127.6 212.7 255.5
343 °C 8.4 18.4 36.4 72.8 109.2 182.0 255.5
Outlet pressure limit
Conventional design 18.4 18.4 18.4 18.4 48.0 48.0 48.0

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 15.9 32.4 32.4 32.4

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

1) The pressure range 0.2 – 2.5 bar is outside of the type test approval acc. to ISO 4126-1 and AD 2000-Merkblatt A2 (CE).
24

4745_API_LWF_EN_Catalog.indd 24 28.03.18 10:00

 The-Safety-Valve.com

Type 526
Orifice G
Pressure temperature ratings

US units
Valve size 1 1/2 G 3 1 1/2 G 3 1 1/2 G 3 1 1/2 G 3 1 1/2 G 3 2G3 2G3
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 300 1500 x 300 2500 x 300
Actual Orifice diameter d0 [inch] 0.886 0.886 0.886 0.886 0.886 0.886 0.886
Actual Orifice area A0 [inch2] 0.616 0.616 0.616 0.616 0.616 0.616 0.616
Minimum set pressure [psig] S/G/L 3.01) 3.01) 3.01) 3.01) 3.01) 73.0 73.0
Minimum set pressure [psig] S/G 46.6 46.6 46.6 133.4 133.4 133.4 133.4
Balanced bellows Inconel [psig] L 46.4 46.4 46.4 268.0 268.0 268.0 268.0
Body material: WCB 1.0619 Pressure range p [psig] S/G/L
Article numbers 5262.045¤ 5262.046¤ 5262.047¤ 5262.048¤ 5262.049¤ 5262.050¤ 5262.051¤
Maximum -20 to 100 °F 285 285 740 1480 2220 3705 3705
set pressure 450 °F 185 285 615 1235 1845 3080 3705
800 °F 80 285 410 825 1235 2060 3430
Outlet pressure limit G
Conventional design 285 285 285 285 740 740 740

Outlet pressure limit

Balanced bellows design 230 230 230 230 470 470 470

Body material: CF8M 1.4408 Pressure range p [psig] S/G/L

Article numbers 5264.110¤ 5264.111¤ 5264.112¤ 5264.113¤ 5264.114¤ 5264.115¤ 5264.116¤
Maximum -450 to -76 °F 275 275 720 1440 2160 2450 2600
set pressure -75 to -21 °F 275 275 720 1440 2160 3600 3705
-20 to 100 °F 275 275 720 1440 2160 3600 3705
450 °F 180 275 495 975 1485 2480 3705
800 °F 80 275 420 845 1265 2110 3520
1000 °F 20 275 350 700 1050 1750 2915
Outlet pressure limit
Conventional design 275 275 275 275 720 720 720

Outlet pressure limit

Balanced bellows design 230 230 230 230 470 470 470

Body material: WC6 1.7357 Pressure range p [psig] S/G/L

Article numbers – – 5267.052¤ 5267.053¤ 5267.054¤ 5267.055¤ 5267.056¤
Maximum 800 °F – – 510 1015 1525 2540 3705
set pressure 1000 °F – – 215 430 650 1080 1800
Outlet pressure limit
Conventional design – – 285 285 740 740 740

Outlet pressure limit

Balanced bellows design – – 230 230 470 470 470

Body material: LCB Pressure range p [psig] S/G/L

Article numbers 5263.516¤ 5263.517¤ 5263.518¤ 5263.519¤ 5263.520¤ 5263.521¤ 5263.522¤
Maximum -50 to 100 °F 265 265 695 1395 2090 3480 3705
set pressure 400 °F 200 265 615 1230 1845 3075 3705
650 °F 125 265 535 1065 1600 2665 3705
Outlet pressure limit
Conventional design 265 265 265 265 695 695 695

Outlet pressure limit

Balanced bellows design 230 230 230 230 470 470 470

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

1) The pressure range 3.0 – 36.25 psig is outside of the type test approval acc. to ISO 4126-1 and AD 2000-Merkblatt A2 (CE).
25

4745_API_LWF_EN_Catalog.indd 25 28.03.18 10:00

 Type 526
Orifice H
Pressure temperature ratings

Metric units
Valve size 1 1/2 H 3 1 1/2 H 3 2H3 2H3 2H3 2H3
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150 1500 x 300
Actual Orifice diameter d0 [mm] 28.3 28.3 28.3 28.3 28.3 28.3
Actual Orifice area A0 [mm2] 625 625 625 625 625 625
Minimum set pressure [bar] S/G/L 0.2 0.2 0.3 0.3 0.3 0.3
Minimum set pressure [bar] S/G 3.2 3.2 6.5 6.5 6.5 6.5
Balanced bellows Inconel [bar] L 3.2 3.2 12.0 12.0 12.0 12.0
Body material: WCB 1.0619 Pressure range p [bar] S/G/L
Article numbers 5262.142¤ 5262.143¤ 5262.144¤ 5262.145¤ 5262.146¤ 5262.147¤
Maximum -29 to 38 °C 19.7 19.7 51.0 102.1 153.1 189.7
set pressure 232 °C 12.8 19.7 42.4 85.2 127.2 189.7
427 °C 5.5 19.7 28.3 56.9 85.2 142.1
Outlet pressure limit
Conventional design 19.7 19.7 19.7 19.7 19.7 51.0

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 15.9 15.9 28.6
H
Body material: CF8M 1.4408 Pressure range p [bar] S/G/L
Article numbers 5264.152¤ 5264.153¤ 5264.154¤ 5264.155¤ 5264.156¤ 5264.157¤
Maximum -268 to -60 °C 19.0 19.0 49.7 99.3 102.4 110.3
set pressure -59 to -29 °C 19.0 19.0 49.7 99.3 149.0 189.7
-28 to 38 °C 19.0 19.0 49.7 99.3 149.0 189.7
232 °C 12.4 19.0 34.1 67.2 102.4 171.0
427 °C 5.5 19.0 29.0 58.3 87.2 145.5
538 °C 1.4 19.0 24.1 48.3 72.4 120.7
Outlet pressure limit
Conventional design 19.0 19.0 19.0 19.0 19.0 41.4

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 15.9 15.9 28.6

Body material: WC6 1.7357 Pressure range p [bar] S/G/L

Article numbers – – 5267.148¤ 5267.149¤ 5267.150¤ 5267.151¤
Maximum 427 °C – – 35.2 70.0 105.2 175.2
set pressure 538 °C – – 14.8 29.7 44.8 74.5
Outlet pressure limit
Conventional design – – 19.7 19.7 19.7 51.0

Outlet pressure limit

Balanced bellows design – – 15.9 15.9 15.9 28.6

Body material: LCB Pressure range p [bar] S/G/L

Article numbers 5263.523¤ 5263.524¤ 5263.525¤ 5263.526¤ 5263.527¤ 5263.528¤
Maximum -46 to 38 °C 18.4 18.4 48.0 96.0 144.1 189.7
set pressure 200 °C 13.8 18.4 42.5 85.1 127.6 189.7
343 °C 8.4 18.4 36.4 72.8 109.2 182.0
Outlet pressure limit
Conventional design 18.4 18.4 18.4 18.4 18.4 48.0

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 15.9 15.9 28.6

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

26

4745_API_LWF_EN_Catalog.indd 26 28.03.18 10:00

 The-Safety-Valve.com

Type 526
Orifice H
Pressure temperature ratings

US units
Valve size 1 1/2 H 3 1 1/2 H 3 2H3 2H3 2H3 2H3
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150 1500 x 300
Actual Orifice diameter d0 [inch] 1.11 1.11 1.11 1.11 1.11 1.11
Actual Orifice area A0 [inch2] 0.975 0.975 0.975 0.975 0.975 0.975
Minimum set pressure [psig] S/G/L 3.0 3.0 4.0 4.0 4.0 4.0
Minimum set pressure [psig] S/G 46.4 46.4 94.3 94.3 94.3 94.3
Balanced bellows Inconel [psig] L 46.4 46.4 174.0 174.0 174.0 174.0
Body material: WCB 1.0619 Pressure range p [psig] S/G/L
Article numbers 5262.142¤ 5262.143¤ 5262.144¤ 5262.145¤ 5262.146¤ 5262.147¤
Maximum -20 to 100 °F 285 285 740 1480 2220 2750
set pressure 450 °F 185 285 615 1235 1845 2750
800 °F 80 285 410 825 1235 2060
Outlet pressure limit
Conventional design 285 285 285 285 285 740

Outlet pressure limit

Balanced bellows design 230 230 230 230 230 415
H
Body material: CF8M 1.4408 Pressure range p [psig] S/G/L
Article numbers 5264.152¤ 5264.153¤ 5264.154¤ 5264.155¤ 5264.156¤ 5264.157¤
Maximum -450 to -76 °F 275 275 720 1440 1485 1600
set pressure -75 to -21 °F 275 275 720 1440 2160 2750
-20 to 100 °F 275 275 720 1440 2160 2750
450 °F 180 275 495 975 1485 2480
800 °F 80 275 420 845 1265 2110
1000 °F 20 275 350 700 1050 1750
Outlet pressure limit
Conventional design 275 275 275 275 275 600

Outlet pressure limit

Balanced bellows design 230 230 230 230 230 415

Body material: WC6 1.7357 Pressure range p [psig] S/G/L

Article numbers – – 5267.148¤ 5267.149¤ 5267.150¤ 5267.151¤
Maximum 800 °F – – 510 1015 1525 2540
set pressure 1000 °F – – 215 430 650 1080
Outlet pressure limit
Conventional design – – 285 285 285 740

Outlet pressure limit

Balanced bellows design – – 230 230 230 415

Body material: LCB Pressure range p [psig] S/G/L

Article numbers 5263.523¤ 5263.524¤ 5263.525¤ 5263.526¤ 5263.527¤ 5263.528¤
Maximum -50 to 100 °F 265 265 695 1395 2090 2750
set pressure 400 °F 200 265 615 1230 1845 2750
650 °F 125 265 535 1065 1600 2665
Outlet pressure limit
Conventional design 265 265 265 265 265 695

Outlet pressure limit

Balanced bellows design 230 230 230 230 230 415

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

27

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 Type 526
Orifice J
Pressure temperature ratings

Metric units
Valve size 2J3 2J3 3J4 3J4 3J4 3J4
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150 1500 x 300
Actual Orifice diameter d0 [mm] 36.0 36.0 36.0 36.0 36.0 36.0
Actual Orifice area A0 [mm2] 1018 1018 1018 1018 1018 1018
Minimum set pressure [bar] S/G/L 0.2 0.2 0.8 0.8 0.8 0.8
Minimum set pressure [bar] S/G 3.5 3.5 3.5 3.5 3.5 3.5
Balanced bellows Inconel [bar] L 5.0 5.0 5.0 5.0 5.0 5.0
Body material: WCB 1.0619 Pressure range p [bar] S/G/L
Article numbers 5262.162¤ 5262.163¤ 5262.164¤ 5262.165¤ 5262.166¤ 5262.167¤
Maximum -29 to 38 °C 19.7 19.7 51.0 102.1 153.1 186.2
set pressure 232 °C 12.8 19.7 42.4 85.2 127.2 186.2
427 °C 5.5 19.7 28.3 56.9 85.2 142.1
Outlet pressure limit
Conventional design 19.7 19.7 19.7 19.7 19.7 41.4

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 15.9 15.9 15.9

Body material: CF8M 1.4408 Pressure range p [bar] S/G/L

Article numbers 5264.196¤ 5264.197¤ 5264.198¤ 5264.199¤ 5264.200¤ 5264.201¤
Maximum -268 to -60 °C 19.0 19.0 34.5 43.1 55.2 55.2
J set pressure -59 to -29 °C 19.0 19.0 49.7 99.3 149.0 186.2
-28 to 38 °C 19.0 19.0 49.7 99.3 149.0 186.2
232 °C 12.4 19.0 34.1 67.2 102.4 171.0
427 °C 5.5 19.0 29.0 58.3 87.2 145.5
538 °C 1.4 19.0 24.1 48.3 72.4 120.7
Outlet pressure limit
Conventional design 19.0 19.0 19.0 19.0 19.0 41.4

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 15.9 15.9 15.9

Body material: WC6 1.7357 Pressure range p [bar] S/G/L

Article numbers – – 5267.168¤ 5267.169¤ 5267.170¤ 5267.171¤
Maximum 427 °C – – 35.2 70.0 105.2 175.2
set pressure 538 °C – – 14.8 29.7 44.8 74.5
Outlet pressure limit
Conventional design – – 19.7 19.7 19.7 41.4

Outlet pressure limit

Balanced bellows design – – 15.9 15.9 15.9 15.9

Body material: LCB Pressure range p [bar] S/G/L

Article numbers 5263.529¤ 5263.530¤ 5263.531¤ 5263.532¤ 5263.533¤ 5263.534¤
Maximum -46 to 38 °C 18.4 18.4 48.0 96.0 144.1 186.2
set pressure 200 °C 13.8 18.4 42.5 85.1 127.6 186.2
343 °C 8.4 18.4 36.4 72.8 109.2 182.0
Outlet pressure limit
Conventional design 18.4 18.4 18.4 18.4 18.4 41.4

Outlet pressure limit

Balanced bellows design 15.9 15.9 15.9 15.9 15.9 15.9

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

28

4745_API_LWF_EN_Catalog.indd 28 28.03.18 10:00

 The-Safety-Valve.com

Type 526
Orifice J
Pressure temperature ratings

US units
Valve size 2J3 2J3 3J4 3J4 3J4 3J4
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150 1500 x 300
Actual Orifice diameter d0 [inch] 1.42 1.42 1.42 1.42 1.42 1.42
Actual Orifice areat A0 [inch2] 1.58 1.58 1.58 1.58 1.58 1.58
Minimum set pressure [psig] S/G/L 3.0 3.0 12.0 12.0 12.0 12.0
Minimum set pressure [psig] S/G 50.8 50.8 50.8 50.8 50.8 50.8
Balanced bellows Inconel [psig] L 72.5 72.5 72.5 72.5 72.5 72.5
Body material: WCB 1.0619 Pressure range p [psig] S/G/L
Article numbers 5262.162¤ 5262.163¤ 5262.164¤ 5262.165¤ 5262.166¤ 5262.167¤
Maximum -20 to 100 °F 285 285 740 1480 2220 2700
set pressure 450 °F 185 285 615 1235 1845 2700
800 °F 80 285 410 825 1235 2060
Outlet pressure limit
Conventional design 285 285 285 285 285 600

Outlet pressure limit

Balanced bellows design 230 230 230 230 230 230

Body material: CF8M 1.4408 Pressure range p [psig] S/G/L

Article numbers 5264.196¤ 5264.197¤ 5264.198¤ 5264.199¤ 5264.200¤ 5264.201¤
Maximum -450 to -76 °F 275 275 500 625 800 800
set pressure -75 to -21 °F 275 275 720 1440 2160 2700 J
-20 to 100 °F 275 275 720 1440 2160 2700
450 °F 180 275 495 975 1485 2480
800 °F 80 275 420 845 1265 2110
1000 °F 20 275 350 700 1050 1750
Outlet pressure limit
Conventional design 275 275 275 275 275 600

Outlet pressure limit

Balanced bellows design 230 230 230 230 230 230

Body material: WC6 1.7357 Pressure range p [psig] S/G/L

Article numbers – – 5267.168¤ 5267.169¤ 5267.170¤ 5267.171¤
Maximum 800 °F – – 510 1015 1525 2540
set pressure 1000 °F – – 215 430 650 1080
Outlet pressure limit
Conventional design – – 285 285 285 600

Outlet pressure limit

Balanced bellows design – – 230 230 230 230

Body material: LCB Pressure range p [psig] S/G/L

Article numbers 5263.529¤ 5263.530¤ 5263.531¤ 5263.532¤ 5263.533¤ 5263.534¤
Maximum -50 to 100 °F 265 265 695 1395 2090 2700
set pressure 400 °F 200 265 615 1230 1845 2700
650 °F 125 265 535 1065 1600 2665
Outlet pressure limit
Conventional design 265 265 265 265 265 600

Outlet pressure limit

Balanced bellows design 230 230 230 230 230 230

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

29

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 Type 526
Orifice K
Pressure temperature ratings

Metric units
Valve size 3K4 3K4 3K4 3K4 3K6 3K6
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150 1500 x 300
Actual Orifice diameter d0 [mm] 43.0 43.0 43.0 43.0 43.0 43.0
Actual Orifice area A0 [mm2] 1452 1452 1452 1452 1452 1452
Minimum [bar] S/G/L 0.3 0.3 0.3 0.3 2.3 2.3
set pressure only WC6 0.3 0.3
Minimum set pressure [bar] S/G 2.2 2.2 2.2 5.6 5.6 5.6
Balanced bellows Inconel [bar] L 2.5 2.5 2.5 6.5 6.5 6.5
Body material: WCB 1.0619 Pressure range p [bar] S/G/L
Article numbers 5262.202¤ 5262.203¤ 5262.204¤ 5262.205¤ 5262.206¤
Maximum -29 to 38 °C 19.7 51.0 102.1 153.1 153.1
set pressure 232 °C 12.8 42.4 85.2 127.2 153.1
427 °C 5.5 Use 3 K 4 28.3 56.9 85.2 142.1
Outlet pressure limit 300 x 150
Conventional design 19.7 19.7 19.7 19.7 41.4

Outlet pressure limit

Balanced bellows design 10.3 10.3 13.8 13.8 13.8

Body material: CF8M 1.4408 Pressure range p [bar] S/G/L

Article numbers 5264.211¤ 5264.212¤ 5264.213¤ 5264.214¤ 5264.215¤
Maximum -268 to -60 °C 19.0 36.2 41.4 41.4 51.7
set pressure -59 to -29 °C 19.0 49.7 99.3 149.0 153.1
-28 to 38 °C 19.0 49.7 99.3 149.0 153.1
K 232 °C 12.4
Use 3 K 4
34.1 67.2 102.4 153.1
427 °C 5.5 300 x 150
29.0 58.3 87.2 145.5
538 °C 1.4 24.1 48.3 72.4 120.7
Outlet pressure limit
Conventional design 19.0 19.0 19.0 19.0 41.4

Outlet pressure limit

Balanced bellows design 10.3 10.3 13.8 13.8 13.8

Body material: WC6 1.7357 Pressure range p [bar] S/G/L

Article numbers – 5267.207¤ 5267.208¤ 5267.209¤ 5267.210¤
Maximum 427 °C – 35.2 70.0 105.2 153.1
set pressure 538 °C – 14.8 29.7 44.8 74.5
Use 3 K 4
Outlet pressure limit 300 x 150
Conventional design – 19.7 19.7 19.7 41.4

Outlet pressure limit

Balanced bellows design – 10.3 13.8 13.8 13.8

Body material: LCB Pressure range p [bar] S/G/L

Article numbers 5263.535¤ 5263.536¤ 5263.537¤ 5263.538¤ 5263.539¤
Maximum -46 to 38 °C 18.4 48.0 96.0 144.1 153.1
set pressure 200 °C 13.8 42.5 85.1 127.6 153.1
343 °C 8.4 Use 3 K 4 36.4 72.8 109.2 153.1
Outlet pressure limit 300 x 150
Conventional design 18.4 18.4 18.4 18.4 41.4

Outlet pressure limit

Balanced bellows design 10.3 10.3 13.8 13.8 13.8

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.
30

4745_API_LWF_EN_Catalog.indd 30 28.03.18 10:00

 The-Safety-Valve.com

Type 526
Orifice K
Pressure temperature ratings

US units
Valve size 3K4 3K4 3K4 3K4 3K6 3K6
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150 1500 x 300
Actual Orifice diameter d0 [inch] 1.69 1.69 1.69 1.69 1.69 1.69
Actual Orifice area A0 [inch2] 2.25 2.25 2.25 2.25 2.25 2.25
Minimum [psig] S/G/L 4.0 4.0 4.0 4.0 33.0 33.0
set pressure only WC6 4.0 4.0
Minimum set pressure [psig] S/G 31.9 31.9 31.9 81.2 81.2 81.2
Balanced bellows Inconel [psig] L 36.3 36.3 36.3 94.3 94.3 94.3
Body material: WCB 1.0619 Pressure range p [psig] S/G/L
Article numbers 5262.202¤ 5262.203¤ 5262.204¤ 5262.205¤ 5262.206¤
Maximum -20 to 100 °F 285 740 1480 2220 2220
set pressure 450 °F 185 615 1235 1845 2220
800 °F 80 Use 3 K 4 410 825 1235 2060
Outlet pressure limit 300 x 150
Conventional design 285 285 285 285 600

Outlet pressure limit

Balanced bellows design 150 150 200 200 200

Body material: CF8M 1.4408 Pressure range p [psig] S/G/L

Article numbers 5264.211¤ 5264.212¤ 5264.213¤ 5264.214¤ 5264.215¤
Maximum -450 to -76 °F 275 525 600 600 750
set pressure -75 to -21 °F 275 720 1440 2160 2220
-20 to 100 °F 275 720 1440 2160 2220
450 °F 180
Use 3 K 4
495 975 1485 2220 K
800 °F 80 300 x 150
420 845 1265 2110
1000 °F 20 350 700 1050 1750
Outlet pressure limit
Conventional design 275 275 275 275 600

Outlet pressure limit

Balanced bellows design 150 150 200 200 200

Body material: WC6 1.7357 Pressure range p [psig] S/G/L

Article numbers – 5267.207¤ 5267.208¤ 5267.209¤ 5267.210¤
Maximum 800 °F – 510 1015 1525 2220
set pressure 1000 °F – 215 430 650 1080
Use 3 K 4
Outlet pressure limit
– 300 x 150 285 285 285 600
Conventional design
Outlet pressure limit
Balanced bellows design – 150 200 200 200

Body material: LCB Pressure range p [psig] S/G/L

Article numbers 5263.535¤ 5263.536¤ 5263.537¤ 5263.538¤ 5263.539¤
Maximum -50 to 100 °F 265 695 1395 2090 2220
set pressure 400 °F 200 615 1230 1845 2220
650 °F 125 Use 3 K 4 535 1065 1600 2220
Outlet pressure limit 300 x 150
Conventional design 265 265 265 265 600

Outlet pressure limit

Balanced bellows design 150 150 200 200 200

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.
31

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 Type 526
Orifice L
Pressure temperature ratings

Metric units
Valve size 3L4 3L4 4L6 4L6 4L6 4L6
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150 1500 x 150
Actual Orifice diameter d0 [mm] 53.5 53.5 53.5 53.5 53.5 53.5
Actual Orifice area A0 [mm2] 2248 2248 2248 2248 2248 2248
Minimum set pressure [bar] S/G/L 0.3 0.3 0.2 0.2 0.2 0.2
Minimum set pressure [bar] S/G 3.5 3.5 3.5 3.5 3.5 3.5
Balanced bellows Inconel [bar] L 3.5 3.5 6.0 6.0 6.0 6.0
Body material: WCB 1.0619 Pressure range p [bar] S/G/L
Article numbers 5262.232¤ 5262.233¤ 5262.234¤ 5262.235¤ 5262.236¤ 5262.237¤
Maximum -29 to 38 °C 19.7 19.7 51.0 69.0 103.4 103.4
set pressure 232 °C 12.8 19.7 42.4 69.0 103.4 103.4
427 °C 5.5 19.7 28.3 56.9 85.2 103.4
Outlet pressure limit
Conventional design 19.7 19.7 19.7 19.7 19.7 19.7

Outlet pressure limit

Balanced bellows design 6.9 6.9 11.7 11.7 11.7 11.7

Body material: CF8M 1.4408 Pressure range p [bar] S/G/L

Article numbers 5264.242¤ 5264.243¤ 5264.244¤ 5264.245¤ 5264.246¤ –
Maximum -268 to -60 °C 19.0 19.0 36.9 36.9 48.3 –
set pressure -59 to -29 °C 19.0 19.0 49.7 69.0 103.4 –
-28 to 38 °C 19.0 19.0 49.7 69.0 103.4 –
232 °C 12.4 19.0 34.1 67.2 102.4 –
427 °C 5.5 19.0 29.0 58.3 87.2 –
538 °C 1.4 19.0 24.1 48.3 72.4 –
Outlet pressure limit
Conventional design 19.0 19.0 19.0 19.0 19.0 –
L Outlet pressure limit
Balanced bellows design 6.9 6.9 11.7 11.7 11.7 –

Body material: WC6 1.7357 Pressure range p [bar] S/G/L

Article numbers – – 5267.238¤ 5267.239¤ 5267.240¤ 5267.241¤
Maximum 427 °C – – 35.2 69.0 103.4 103.4
set pressure 538 °C – – 14.8 29.7 44.8 74.5
Outlet pressure limit
Conventional design – – 19.7 19.7 19.7 19.7

Outlet pressure limit

Balanced bellows design – – 11.7 11.7 11.7 11.7

Body material: LCB Pressure range p [bar] S/G/L

Article numbers 5263.540¤ 5263.541¤ 5263.542¤ 5263.543¤ 5263.544¤ 5263.545¤
Maximum -46 to 38 °C 18.4 18.4 48.0 69.0 103.4 103.4
set pressure 200 °C 13.8 18.4 42.5 69.0 103.4 103.4
343 °C 8.4 18.4 36.4 69.0 103.4 103.4
Outlet pressure limit
Conventional design 18.4 18.4 18.4 18.4 18.4 18.4

Outlet pressure limit

Balanced bellows design 6.9 6.9 11.7 11.7 11.7 11.7

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

32

4745_API_LWF_EN_Catalog.indd 32 28.03.18 10:00

 The-Safety-Valve.com

Type 526
Orifice L
Pressure temperature ratings

US units
Valve size 3L4 3L4 4L6 4L6 4L6 4L6
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150 1500 x 150
Actual Orifice diameter d0 [inch] 2.11 2.11 2.11 2.11 2.11 2.11
Actual Orifice area A0 [inch2] 3.48 3.48 3.48 3.48 3.48 3.48
Minimum set pressure [psig] S/G/L 4.0 4.0 3.0 3.0 3.0 3.0
Minimum set pressure [psig] S/G 50.8 50.8 50.8 50.8 50.8 50.8
Balanced bellows Inconel [psig] L 50.8 50.8 87.0 87.0 87.0 87.0
Body material: WCB 1.0619 Pressure range p [psig] S/G/L
Article numbers 5262.232¤ 5262.233¤ 5262.234¤ 5262.235¤ 5262.236¤ 5262.237¤
Maximum -20 to 100 °F 285 285 740 1000 1500 1500
set pressure 450 °F 185 285 615 1000 1500 1500
800 °F 80 285 410 825 1235 1500
Outlet pressure limit
Conventional design 285 285 285 285 285 285

Outlet pressure limit

Balanced bellows design 100 100 170 170 170 170

Body material: CF8M 1.4408 Pressure range p [psig] S/G/L

Article numbers 5264.242¤ 5264.243¤ 5264.244¤ 5264.245¤ 5264.246¤ –
Maximum -450 to -76 °F 275 275 535 535 700 –
set pressure -75 to -21 °F 275 275 720 1000 1500 –
-20 to 100 °F 275 275 720 1000 1500 –
450 °F 180 275 495 975 1485 –
800 °F 80 275 420 845 1265 –
1000 °F 20 275 350 700 1050 –
Outlet pressure limit
Conventional design 275 275 275 275 275 –

Outlet pressure limit L

Balanced bellows design 100 100 170 170 170 –

Body material: WC6 1.7357 Pressure range p [psig] S/G/L

Article numbers – – 5267.238¤ 5267.239¤ 5267.240¤ 5267.241¤
Maximum 800 °F – – 510 1000 1500 1500
set pressure 1000 °F – – 215 430 650 1080
Outlet pressure limit
Conventional design – – 285 285 285 285

Outlet pressure limit

Balanced bellows design – – 170 170 170 170

Body material: LCB Pressure range p [psig] S/G/L

Article numbers 5263.540¤ 5263.541¤ 5263.542¤ 5263.543¤ 5263.544¤ 5263.545¤
Maximum -50 to 100 °F 265 265 695 1000 1500 1500
set pressure 400 °F 200 265 615 1000 1500 1500
650 °F 125 265 535 1000 1500 1500
Outlet pressure limit
Conventional design 265 265 265 265 265 265

Outlet pressure limit

Balanced bellows design 100 100 170 170 170 170

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

33

4745_API_LWF_EN_Catalog.indd 33 28.03.18 10:00

 Type 526
Orifice M
Pressure temperature ratings

Metric units
Valve size 4M6 4M6 4M6 4M6 4M6
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150
Actual Orifice diameter d0 [mm] 60.3 60.3 60.3 60.3 60.3
Actual Orifice area A0 [mm2] 2846 2846 2846 2846 2846
Minimum set pressure [bar] S/G/L 0.2 0.2 0.2 0.2 0.2
Minimum set pressure [bar] S/G 2.6 2.6 2.6 6.3 10.5
Balanced bellows Inconel [bar] L 2.2 2.2 2.2 10.5 10.5
Body material: WCB 1.0619 Pressure range p [bar] S/G/L
Article numbers 5262.580¤ 5262.581¤ 5262.582¤ 5262.583¤
Maximum -29 to 38 °C 19.7 51.0 75.9 75.9
set pressure 232 °C 12.8 42.4 75.9 75.9
427 °C 5.5 Use 4 M 6 28.3 56.9 75.9
Outlet pressure limit 300 x 150
Conventional design 19.7 19.7 19.7 19.7

Outlet pressure limit

Balanced bellows design 5.5 11.0 11.0 11.0

Body material: CF8M 1.4408 Pressure range p [bar] S/G/L

Article numbers 5264.587¤ 5264.588¤ 5264.589¤ –
Maximum -268 to -60 °C 19.0 36.2 41.4 –
set pressure -59 to -29 °C 19.0 49.7 69.0 –
-28 to 38 °C 19.0 49.7 69.0 –
232 °C 12.4 34.1 67.2 –
Use 4 M 6
427 °C 5.5 300 x 150
29.0 58.3 –
538 °C 1.4 24.1 48.3 –
Outlet pressure limit
Conventional design 19.0 19.0 19.0 –

Outlet pressure limit

Balanced bellows design 5.5 11.0 11.0 –

Body material: WC6 1.7357 Pressure range p [bar] S/G/L

M Article numbers – 5267.584¤ 5267.585¤ 5267.586¤
Maximum 427 °C – 35.2 69.0 75.8
set pressure 538 °C – 14.8 29.7 44.8
Use 4 M 6
Outlet pressure limit 300 x 150
Conventional design – 19.7 19.7 19.7

Outlet pressure limit

Balanced bellows design – 11.0 11.0 11.0

Body material: LCB Pressure range p [bar] S/G/L

Article numbers 5263.546¤ 5263.547¤ 5263.548¤ 5263.549¤
Maximum -46 to 38 °C 18.4 48.0 75.9 75.9
set pressure 200 °C 13.8 42.5 75.9 75.9
343 °C 8.4 Use 4 M 6 36.4 72.8 75.9
Outlet pressure limit 300 x 150
Conventional design 18.4 18.4 18.4 18.4

Outlet pressure limit

Balanced bellows design 5.5 11.0 11.0 11.0

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

34

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 The-Safety-Valve.com

Type 526
Orifice M
Pressure temperature ratings

US units
Valve size 4M6 4M6 4M6 4M6 4M6
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150
Actual Orifice diameter d0 [inch] 2.37 2.37 2.37 2.37 2.37
Actual Orifice area A0 [inch2] 4.43 4.43 4.43 4.43 4.43
Minimum set pressure [psig] S/G/L 3.0 3.0 3.0 3.0 3.0
Minimum set pressure [psig] S/G 37.7 37.7 37.7 91.4 152.3
Balanced bellows Inconel [psig] L 31.9 31.9 31.9 152.3 152.3
Body material: WCB 1.0619 Pressure range p [psig] S/G/L
Article numbers 5262.580¤ 5262.581¤ 5262.582¤ 5262.583¤
Maximum -20 to 100 °F 285 740 1100 1100
set pressure 450 °F 185 615 1100 1100
800 °F 80 Use 4 M 6 410 825 1100
Outlet pressure limit 300 x 150
Conventional design 285 285 285 285

Outlet pressure limit

Balanced bellows design 80 160 160 160

Body material: CF8M 1.4408 Pressure range p [psig] S/G/L

Article numbers 5264.587¤ 5264.588¤ 5264.589¤ –
Maximum -450 to -76 °F 275 525 600 –
set pressure -75 to -21 °F 275 720 1000 –
-20 to 100 °F 275 720 1000 –
450 °F 180 495 975 –
Use 4 M 6
800 °F 80 300 x 150
420 845 –
1000 °F 20 350 700 –
Outlet pressure limit
Conventional design 275 275 275 –

Outlet pressure limit

Balanced bellows design 80 160 160 –

Body material: WC6 1.7357 Pressure range p [psig] S/G/L

Article numbers – 5267.584¤ 5267.585¤ 5267.586¤ M
Maximum 800 °F – 510 1000 1100
set pressure 1000 °F – 215 430 650
Use 4 M 6
Outlet pressure limit 300 x 150
Conventional design – 285 285 285

Outlet pressure limit

Balanced bellows design – 160 160 160

Body material: LCB Pressure range p [psig] S/G/L

Article numbers 5263.546 ¤
5263.547¤ 5263.548¤ 5263.549¤
Maximum -50 to 100 °F 265 695 1100 1100
set pressure 400 °F 200 615 1100 1100
650 °F 125 Use 4 M 6 535 1065 1100
Outlet pressure limit 300 x 150
Conventional design 265 265 265 265

Outlet pressure limit

Balanced bellows design 80 160 160 160
¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

35

4745_API_LWF_EN_Catalog.indd 35 28.03.18 10:00

 Type 526
Orifice N
Pressure temperature ratings

Metric units
Valve size 4N6 4N6 4N6 4N6 4N6
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150
Actual Orifice diameter d0 [mm] 66.0 66.0 66.0 66.0 66.0
Actual Orifice area A0 [mm2] 3421 3421 3421 3421 3421
Minimum set pressure [bar] S/G/L 0.2 0.2 0.2 0.2 0.2
Minimum set pressure [bar] S/G 1.8 1.8 1.8 5.2 5.2
Balanced bellows Inconel [bar] L 1.8 1.8 1.8 8.9 8.9
Body material: WCB 1.0619 Pressure range p [bar] S/G/L
Article numbers 5262.590¤ 5262.591¤ 5262.592¤ 5262.593¤
Maximum -29 to 38 °C 19.7 51.0 69.0 69.0
set pressure 232 °C 12.8 42.4 69.0 69.0
427 °C 5.5 Use 4 N 6 28.3 56.9 69.0
Outlet pressure limit 300 x 150
Conventional design 19.7 19.7 19.7 19.7

Outlet pressure limit

Balanced bellows design 5.5 11.0 11.0 11.0

Body material: CF8M 1.4408 Pressure range p [bar] S/G/L

Article numbers 5264.597¤ 5264.598¤ 5264.599¤ –
Maximum -268 to -60 °C 19.0 31.0 34.5 –
set pressure -59 to -29 °C 19.0 49.7 69.0 –
-28 to 38 °C 19.0 49.7 69.0 –
232 °C 12.4 34.1 67.2 –
Use 4 N 6
427 °C 5.5 300 x 150
29.0 58.3 –
538 °C 1.4 24.1 48.3 –
Outlet pressure limit
Conventional design 19.0 19.0 19.0 –

Outlet pressure limit

Balanced bellows design 5.5 11.0 11.0 –

Body material: WC6 1.7357 Pressure range p [bar] S/G/L

Article numbers – 5267.594¤ 5267.595¤ 5267.596¤
Maximum 427 °C – 35.2 69.0 69.0
set pressure 538 °C – 14.8 29.7 44.8
Use 4 N 6
Outlet pressure limit
N Conventional design – 300 x 150 19.7 19.7 19.7

Outlet pressure limit

Balanced bellows design – 11.0 11.0 11.0

Body material: LCB Pressure range p [bar] S/G/L

Article numbers 5263.550¤ 5263.551¤ 5263.552¤ 5263.553¤
Maximum -46 to 38 °C 18.4 48.0 69.0 69.0
set pressure 200 °C 13.8 42.5 69.0 69.0
343 °C 8.4 Use 4 N 6 36.4 69.0 69.0
Outlet pressure limit 300 x 150
Conventional design 18.4 18.4 18.4 18.4

Outlet pressure limit

Balanced bellows design 5.5 11.0 11.0 11.0

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

36

4745_API_LWF_EN_Catalog.indd 36 28.03.18 10:00

 The-Safety-Valve.com

Type 526
Orifice N
Pressure temperature ratings

US units
Valve size 4N6 4N6 4N6 4N6 4N6
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150
Actual Orifice diameter d0 [inch] 2.60 2.60 2.60 2.60 2.60
Actual Orifice area A0 [inch2] 5.30 5.30 5.30 5.30 5.30
Minimum set pressure [psig] S/G/L 3.0 3.0 3.0 3.0 3.0
Minimum set pressure [psig] S/G 26.1 26.1 26.1 75.4 75.4
Balanced bellows Inconel [psig] L 26.1 26.1 26.1 129.0 129.0
Body material: WCB 1.0619 Pressure range p [psig] S/G/L
Article numbers 5262.590¤ 5262.591¤ 5262.592¤ 5262.593¤
Maximum -20 to 100 °F 285 740 1000 1000
set pressure 450 °F 185 615 1000 1000
800 °F 80 Use 4 N 6 410 825 1000
Outlet pressure limit 300 x 150
Conventional design 285 285 285 285

Outlet pressure limit

Balanced bellows design 80 160 160 160

Body material: CF8M 1.4408 Pressure range p [psig] S/G/L

Article numbers 5264.597¤ 5264.598¤ 5264.599¤ –
Maximum -450 to -76 °F 275 450 500 –
set pressure -75 to -21 °F 275 720 1000 –
-20 to 100 °F 275 720 1000 –
450 °F 180 495 975 –
Use 4 N 6
800 °F 80 300 x 150
420 845 –
1000 °F 20 350 700 –
Outlet pressure limit
Conventional design 275 275 275 –

Outlet pressure limit

Balanced bellows design 80 160 160 –

Body material: WC6 1.7357 Pressure range p [psig] S/G/L

Article numbers – 5267.594¤ 5267.595¤ 5267.596¤
Maximum 800 °F – 510 1000 1000
set pressure 1000 °F – 215 430 650
Use 4 N 6
Outlet pressure limit
Conventional design – 300 x 150 285 285 285 N
Outlet pressure limit
Balanced bellows design – 160 160 160

Body material: LCB Pressure range p [psig] S/G/L

Article numbers 5263.550¤ 5263.551¤ 5263.552¤ 5263.553¤
Maximum -50 to 100 °F 265 695 1000 1000
set pressure 400 °F 200 615 1000 1000
650 °F 125 Use 4 N 6 535 1000 1000
Outlet pressure limit 300 x 150
Conventional design 265 265 265 265

Outlet pressure limit

Balanced bellows design 80 160 160 160

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

37

4745_API_LWF_EN_Catalog.indd 37 28.03.18 10:00

 Type 526
Orifice P
Pressure temperature ratings

Metric units
Valve size 4P6 4P6 4P6 4P6 4P6
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150
Actual Orifice diameter d0 [mm] 80.0 80.0 80.0 80.0 80.0
Actual Orifice area A0 [mm2] 5027 5027 5027 5027 5027
Minimum set pressure [bar] S/G/L 0.2 0.2 0.2 0.2 0.2
Minimum set pressure [bar] S/G 2.3 2.3 2.3 2.3 2.3
Balanced bellows Inconel [bar] L 2.5 2.5 2.5 2.5 2.5
Body material: WCB 1.0619 Pressure range p [bar] S/G/L
Article numbers 5262.645¤ 5262.646¤ 5262.647¤ 5262.648¤ 5262.649¤
Maximum -29 to 38 °C 19.7 19.7 36.2 69.0 69.0
set pressure 232 °C 12.8 19.7 36.2 69.0 69.0
427 °C 5.5 19.7 28.3 56.9 69.0
Outlet pressure limit
Conventional design 19.7 19.7 19.7 19.7 19.7

Outlet pressure limit

Balanced bellows design 5.5 5.5 10.3 10.3 10.3

Body material: CF8M 1.4408 Pressure range p [bar] S/G/L

Article numbers 5264.653¤ 5264.654¤ 5264.655¤ 5264.656¤ –
Maximum -268 to -60 °C 12.1 12.1 20.7 33.1 –
set pressure -59 to -29 °C 19.0 19.0 36.2 69.0 –
-28 to 38 °C 19.0 19.0 36.2 69.0 –
232 °C 12.4 19.0 34.1 67.2 –
427 °C 5.5 19.0 29.0 58.3 –
538 °C 1.4 19.0 24.1 48.3 –
Outlet pressure limit
Conventional design 19.0 19.0 19.0 19.0 –

Outlet pressure limit

Balanced bellows design 5.5 5.5 10.3 10.3 –

Body material: WC6 1.7357 Pressure range p [bar] S/G/L

Article numbers – – 5267.650¤ 5267.651¤ 5267.652¤
Maximum 427 °C – – 35.2 69.0 69.0
set pressure 538 °C – – 14.8 29.7 44.8
Outlet pressure limit
Conventional design – – 19.7 19.7 19.7

Outlet pressure limit

Balanced bellows design – – 10.3 10.3 10.3

P Body material: LCB Pressure range p [bar] S/G/L

Article numbers 5263.554¤ 5263.555¤ 5263.556¤ 5263.557¤ 5263.558¤
Maximum -46 to 38 °C 18.4 18.4 36.2 69.0 69.0
set pressure 200 °C 13.8 18.4 36.2 69.0 69.0
343 °C 8.4 18.4 36.2 69.0 69.0
Outlet pressure limit
Conventional design 18.4 18.4 18.4 18.4 18.4

Outlet pressure limit

Balanced bellows design 5.5 5.5 10.3 10.3 10.3

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due
 to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

38

4745_API_LWF_EN_Catalog.indd 38 28.03.18 10:00

 The-Safety-Valve.com

Type 526
Orifice P
Pressure temperature ratings

US units
Valve size 4P6 4P6 4P6 4P6 4P6
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150 900 x 150
Actual Orifice diameter d0 [inch] 3.15 3.15 3.15 3.15 3.15
Actual Orifice area A0 [inch2] 7.79 7.79 7.79 7.79 7.79
Minimum set pressure [psig] S/G/L 2.0 2.0 4.0 4.0 4.0
Minimum set pressure [psig] S/G 33.4 33.4 33.4 33.4 33.4
Balanced bellows Inconel [psig] L 36.3 36.3 36.3 36.3 36.3
Body material: WCB 1.0619 Pressure range p [psig] S/G/L
Article numbers 5262.645¤ 5262.646¤ 5262.647¤ 5262.648¤ 5262.649¤
Maximum -20 to 100 °F 285 285 525 1000 1000
set pressure 450 °F 185 285 525 1000 1000
800 °F 80 285 410 825 1000
Outlet pressure limit
Conventional design 285 285 285 285 285

Outlet pressure limit

Balanced bellows design 80 80 150 150 150

Body material: CF8M 1.4408 Pressure range p [psig] S/G/L

Article numbers 5264.653¤ 5264.654¤ 5264.655¤ 5264.656¤ –
Maximum -450 to -76 °F 175 175 300 480 –
set pressure -75 to -21 °F 275 275 525 1000 –
-20 to 100 °F 275 275 525 1000 –
450 °F 180 275 495 975 –
800 °F 80 275 420 845 –
1000 °F 20 275 350 700 –
Outlet pressure limit
Conventional design 275 275 275 275 –

Outlet pressure limit

Balanced bellows design 80 80 150 150 –

Body material: WC6 1.7357 Pressure range p [psig] S/G/L

Article numbers – – 5267.650¤ 5267.651¤ 5267.652¤
Maximum 800 °F – – 510 1000 1000
set pressure 1000 °F – – 215 430 650
Outlet pressure limit
Conventional design – – 285 285 285

Outlet pressure limit

Balanced bellows design – – 150 150 150

Body material: LCB Pressure range p [psig] S/G/L P

Article numbers 5263.554¤ 5263.555¤ 5263.556¤ 5263.557¤ 5263.558¤
Maximum -50 to 100 °F 265 265 525 1000 1000
set pressure 400 °F 200 265 525 1000 1000
650 °F 125 265 525 1000 1000
Outlet pressure limit
Conventional design 265 265 265 265 265

Outlet pressure limit

Balanced bellows design 80 80 150 150 150

¤)
Please add code for the required cap or lifting device. See page 11.

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

39

4745_API_LWF_EN_Catalog.indd 39 28.03.18 10:00

 Type 526
Orifice Q
Pressure temperature ratings

Metric units
Valve size 6Q8 6Q8 6Q8 6Q8
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150
Actual Orifice diameter d0 [mm] 105.5 105.5 105.5 105.5
Actual Orifice area A0 [mm2] 8742 8742 8742 8742
Minimum set pressure [bar] S/G/L 0.2 0.2 0.2 0.2
Minimum set pressure [bar] S/G 1.3 1.3 1.3 1.3
Balanced bellows Inconel [bar] L 2.3 2.3 2.3 2.3
Body material: WCB 1.0619 Pressure range p [bar] S/G/L
Article numbers 5262.657¤ 5262.658¤ 5262.659¤
Maximum -29 to 38 °C 11.4 20.7 41.4 (70)
set pressure 232 °C 11.4 20.7 41.4 (70)
427 °C 5.5 Use 6 Q 8 20.7 41.4 (56.9)
Outlet pressure limit 300 x 150
Conventional design 7.9 7.9 7.9

Outlet pressure limit

Balanced bellows design 4.8 7.9 7.9

Body material: CF8M 1.4408 Pressure range p [bar] S/G/L

Article numbers 5264.662¤ 5264.663¤ 5264.664¤
Maximum -268 to -60 °C 11.4 17.2 20.7
set pressure -59 to -29 °C 11.4 20.7 41.4
-28 to 38 °C 11.4 20.7 41.4
232 °C 11.4 20.7 41.4
Use 6 Q 8
427 °C 5.5 300 x 150 20.7 41.4
538 °C 1.4 20.7 41.4
Outlet pressure limit
Conventional design 7.9 7.9 7.9

Outlet pressure limit

Balanced bellows design 4.8 7.9 7.9

Body material: WC6 1.7357 Pressure range p [bar] S/G/L

Article numbers – 5267.660¤ 5267.661¤
Maximum 427 °C – 11.4 41.4 (70)
set pressure 538 °C – 11.4 29.7 (29.7)
Use 6 Q 8
Outlet pressure limit 300 x 150
Conventional design – 7.9 7.9

Outlet pressure limit

Balanced bellows design – 7.9 7.9

Body material: LCB Pressure range p [bar] S/G/L

Article numbers 5263.559¤ 5263.560¤ 5263.561¤
Maximum -46 to 38 °C 11.4 20.7 41.4 (70)
set pressure 200 °C 11.4 20.7 41.4 (70)
Q 343 °C 8.4 Use 6 Q 8 20.7 41.4 (70)
Outlet pressure limit 300 x 150
Conventional design 7.9 7.9 7.9

Outlet pressure limit

Balanced bellows design 4.8 7.9 7.9

¤)
Please add code for the required cap or lifting device. See page 11.
( ) = maximum set pressure of Type 526 high pressure design (Option code Z90)

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

40

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 The-Safety-Valve.com

Type 526
Orifice Q
Pressure temperature ratings

US units
Valve size 6Q8 6Q8 6Q8 6Q8
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150
Actual Orifice diameter d0 [inch] 4.15 4.15 4.15 4.15
Actual Orifice area A0 [inch2] 13.55 13.55 13.55 13.55
Minimum set pressure [psig] S/G/L 3.0 3.0 3.0 3.0
Minimum set pressure [psig] S/G 18.8 18.8 18.8 18.8
Balanced bellows Inconel [psig] F 33.4 33.4 33.4 33.4
Body material: WCB 1.0619 Pressure range p [psig] S/G/L
Article numbers 5262.657¤ 5262.658¤ 5262.659¤
Maximum -20 to 100 °F 165 300 600 (1015)
set pressure 450 °F 165 300 600 (1015)
800 °F 80 Use 6 Q 8 300 600 (825)
Outlet pressure limit 300 x 150
Conventional design 115 115 115

Outlet pressure limit

Balanced bellows design 70 115 115

Body material: CF8M 1.4408 Pressure range p [psig] S/G/L

Article numbers 5264.662¤ 5264.663¤ 5264.664¤
Maximum -450 to -76 °F 165 250 300
set pressure -75 to -21 °F 165 300 600
-20 to 100 °F 165 300 600
450 °F 165 300 600
Use 6 Q 8
800 °F 80 300 x 150 300 600
1000 °F 20 300 600
Outlet pressure limit
Conventional design 115 115 115

Outlet pressure limit

Balanced bellows design 70 115 115

Body material: WC6 1.7357 Pressure range p [psig] S/G/L

Article numbers – 5267.660¤ 5267.661¤
Maximum 800 °F – 165 600 (1015)
set pressure 1000 °F – 165 430 (430)
Use 6 Q 8
Outlet pressure limit 300 x 150
Conventional design – 115 115

Outlet pressure limit

Balanced bellows design – 115 115

Body material: LCB Pressure range p [psig] S/G/L

Article numbers 5263.559¤ 5263.560¤ 5263.561¤
Maximum -50 to 100 °F 165 300 600 (1015)
set pressure 400 °F 165 300 600 (1015)
650 °F 125 Use 6 Q 8 300 600 (1015) Q
Outlet pressure limit 300 x 150
Conventional design 115 115 115

Outlet pressure limit

Balanced bellows design 70 115 115

¤)
Please add code for the required cap or lifting device. See page 11.
( ) = maximum set pressure of Type 526 high pressure design (Option code Z90)

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

41

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 Type 526
Orifice R
Pressure temperature ratings

Metric units
Valve size 6R8 6R8 6 R 10 6 R 10
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150
Actual Orifice diameter d0 [mm] 126.0 126.0 126.0 126.0
Actual Orifice area A0 [mm2] 12568 12568 12568 12568
Minimum set pressure [bar] S/G/L 0.2 0.2 0.2 0.2
Minimum set pressure [bar] S/G 1.0 1.0 3.0 3.0
Balanced bellows Inconel [bar] L 1.4 1.4 3.0 3.0
Body material: WCB 1.0619 Pressure range p [bar] S/G/L
Article numbers 5262.665¤ 5262.666¤ 5262.667¤ 5262.668¤
Maximum -29 to 38 °C 6.9 6.9 15.9 20.7 (63)
Set pressure 232 °C 6.9 6.9 15.9 20.7 (63)
427 °C 5.5 6.9 15.9 20.7 (56.7)
Outlet pressure limit
Conventional design 4.1 4.1 6.9 6.9

Outlet pressure limit

Balanced bellows design 4.1 4.1 6.9 6.9

Body material: CF8M 1.4408 Pressure range p [bar] S/G/L

Article numbers 5264.671¤ 5264.672¤ 5264.673¤ 5264.674¤
Maximum -268 to -60 °C 3.8 3.8 10.3 13.8
Set pressure -59 to -29 °C 6.9 6.9 15.9 20.7
-28 to 38 °C 6.9 6.9 15.9 20.7
232 °C 6.9 6.9 15.9 20.7
427 °C 5.5 6.9 15.9 20.7
538 °C 1.4 6.9 15.9 20.7
Outlet pressure limit
Conventional design 4.1 4.1 6.9 6.9

Outlet pressure limit

Balanced bellows design 4.1 4.1 6.9 6.9

Body material: WC6 1.7357 Pressure range p [bar] S/G/L

Article numbers – 5267.669¤ – 5267.670¤
Maximum 427 °C – 6.9 – 20.7 (63)
Set pressure 538 °C – 6.9 – 20.7 (29.7)
Outlet pressure limit
Conventional design – 4.1 – 6.9

Outlet pressure limit

Balanced bellows design – 4.1 – 6.9

Body material: LCB Pressure range p [bar] S/G/L

Article numbers 5263.562¤ 5263.563¤ 5263.564¤ 5263.565¤
Maximum -46 to 38 °C 6.9 6.9 15.9 20.7 (63)
Set pressure 200 °C 6.9 6.9 15.9 20.7 (63)
343 °C 6.9 6.9 15.9 20.7 (63)
Outlet pressure limit
Conventional design 4.1 4.1 6.9 6.9

R Outlet pressure limit

Balanced bellows design 4.1 4.1 6.9 6.9

¤)
Please add code for the required cap or lifting device. See page 11.
( ) = maximum set pressure of Type 526 high pressure design (Option code Z90)

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

42

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 The-Safety-Valve.com

Type 526
Orifice R
Pressure temperature ratings

US units
Valve size 6R8 6R8 6 R 10 6 R 10
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150 600 x 150
Actual Orifice diameter d0 [inch] 4.96 4.96 4.96 4.96
Actual Orifice area A0 [inch2] 19.33 19.33 19.33 19.33
Minimum set pressure [psig] S/G/L 3.0 3.0 3.0 3.0
Minimum set pressure [psig] S/G 14.5 14.5 43.5 43.5
Balanced bellows Inconel [psig] L 20.3 20.3 43.5 43.5
Body material: WCB 1.0619 Pressure range p [psig] S/G/L
Article numbers 5262.665¤ 5262.666¤ 5262.667¤ 5262.668¤
Maximum -20 to 100 °F 100 100 230 300 (913.5)
Set pressure 450 °F 100 100 230 300 (913.5)
800 °F 80 100 230 300 (825)
Outlet pressure limit
Conventional design 60 60 100 100

Outlet pressure limit

Balanced bellows design 60 60 100 100

Body material: CF8M 1.4408 Pressure range p [psig] S/G/L

Article numbers 5264.671¤ 5264.672¤ 5264.673¤ 5264.674¤
Maximum -450 to -76 °F 55 55 150 200
Set pressure -75 to -21 °F 100 100 230 300
-20 to 100 °F 100 100 230 300
450 °F 100 100 230 300
800 °F 80 100 230 300
1000 °F 20 100 230 300
Outlet pressure limit
Conventional design 60 60 100 100

Outlet pressure limit

Balanced bellows design 60 60 100 100

Body material: WC6 1.7357 Pressure range p [psig] S/G/L

Article numbers – 5267.669¤ – 5267.670¤
Maximum 800 °F – 100 – 300 (913.5)
Set pressure 1000 °F – 100 – 300 (430)
Outlet pressure limit
Conventional design – 60 – 100

Outlet pressure limit

Balanced bellows design – 60 – 100

Body material: LCB Pressure range p [psig] S/G/L

Article numbers 5263.562¤ 5263.563¤ 5263.564¤ 5263.565¤
Maximum -50 to 100 °F 100 100 230 300 (913.5)
Set pressure 400 °F 100 100 230 300 (913.5)
650 °F 100 100 230 300 (913.5)
Outlet pressure limit
Conventional design 60 60 100 100

Outlet pressure limit R

Balanced bellows design 60 60 100 100

¤)
Please add code for the required cap or lifting device. See page 11.
( ) = maximum set pressure of Type 526 high pressure design (Option code Z90)

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

43

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 Type 526
Orifice T
Pressure temperature ratings

Metric units
Valve size 8 T 10 8 T 10 8 T 10
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150
Actual Orifice diameter d0 [mm] 161.5 161.5 161.5
Actual Orifice area A0 [mm2] 20485 20485 20485
Minimum set pressure [bar] S/G/L 0.25 0.25 0.25
Minimum set pressure [bar] S/G 1.2 1.2 1.2
Balanced bellows Inconel [bar] L 2.5 2.5 2.5
Body material: WCB 1.0619 Pressure range p [bar] S/G/L
Article numbers 5262.675¤ 5262.676¤
Maximum -29 to 38 °C 4.5 20.7 (36)
set pressure 232 °C 4.5 20.7 (36)
427 °C 4.5 Use 8 T 10 20.7 (28.3)
Outlet pressure limit 300 x 150
Conventional design 2.1 6.9

Outlet pressure limit

Balanced bellows design 2.1 6.9

Body material: CF8M 1.4408 Pressure range p [bar] S/G/L

Article numbers 5264.678¤ 5264.679¤
Maximum -268 to -60 °C 3.4 4.5
set pressure -59 to -29 °C 4.5 8.3
-28 to 38 °C 4.5 8.3
232 °C 4.5 8.3
Use 8 T 10
427 °C 4.5 300 x 150
8.3
538 °C 1.4 8.3
Outlet pressure limit
Conventional design 2.1 4.1

Outlet pressure limit

Balanced bellows design 2.1 4.1

Body material: WC6 1.7357 Pressure range p [bar] S/G/L

Article numbers – 5267.677¤
Maximum 427 °C – 20.7 (35.2)
Set pressure 538 °C – 15.5 (15.5)
Use 8 T 10
Outlet pressure limit 300 x 150
Conventional design – 6.9

Outlet pressure limit

Balanced bellows design – 6.9

Body material: LCB Pressure range p [bar] S/G/L

Article numbers 5263.566¤ 5263.567¤
Maximum -46 to 38 °C 4.5 20.7 (36)
set pressure 200 °C 4.5 20.7 (36)
343 °C 4.5 Use 8 T 10 20.7 (36)
Outlet pressure limit 300 x 150
Conventional design 2.1 6.9

Outlet pressure limit

Balanced bellows design 2.1 6.9

¤)
Please add code for the required cap or lifting device. See page 11.
T ( ) = maximum set pressure of Type 526 high pressure design (Option code Z90)

Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

44

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 The-Safety-Valve.com

Type 526
Orifice T
Pressure temperature ratings

US units
Valve size 8 T 10 8 T 10 8 T 10
Flange rating class Inlet x Outlet 150 x 150 300L x 150 300 x 150
Actual Orifice diameter d0 [inch] 6.36 6.36 6.36
Actual Orifice area A0 [inch2] 31.75 31.75 31.75
Minimum set pressure [psig] S/G/L 4.0 4.0 4.0
Minimum set pressure [psig] S/G 17.4 17.4 17.4
Balanced bellows Inconel [psig] L 36.3 36.3 36.3
Body material: WCB 1.0619 Pressure range p [psig] S/G/L
Article numbers 5262.675¤ 5262.676¤
Maximum -20 to 100 °F 65 300 (522)
set pressure 450 °F 65 300 (522)
800 °F 65 Use 8 T 10 300 (410)
Outlet pressure limit 300 x 150
Conventional design 30 100

Outlet pressure limit

Balanced bellows design 30 100

Body material: CF8M 1.4408 Pressure range p [psig] S/G/L

Article numbers 5264.678¤ 5264.679¤
Maximum -450 to -76 °F 50 65
set pressure -75 to -21 °F 65 120
-20 to 100 °F 65 120
450 °F 65 120
Use 8 T 10
800 °F 65 300 x 150
120
1000 °F 20 120
Outlet pressure limit
Conventional design 30 60

Outlet pressure limit

Balanced bellows design 30 60

Body material: WC6 1.7357 Pressure range p [psig] S/G/L

Article numbers – 5267.677¤
Maximum 800 °F – 300 (510)
set pressure 1000 °F – 225 (225)
Use 8 T 10
Outlet pressure limit 300 x 150
Conventional design – 100

Outlet pressure limit

Balanced bellows design – 100

Body material: LCB Pressure range p [psig] S/G/L

Article numbers 5263.566¤ 5263.567¤
Maximum -50 to 100 °F 65 300 (522)
set pressure 400 °F 65 300 (522)
650 °F 65 Use 8 T 10 300 (522)
Outlet pressure limit 300 x 150
Conventional design 30 100

Outlet pressure limit

Balanced bellows design 30 100

¤)
Please add code for the required cap or lifting device. See page 11.
( ) = maximum set pressure of Type 526 high pressure design (Option code Z90)
T
Remark: SA 352 Gr. LCB is not listed in the API 526. Pressure-Temperature Rating acc. to ASME B16.34 Table 2-1.3
The stated Pressure-Temperature Rating are taken from ASME B16.34 Table 2-1.3 if the maximum pressure is not limited by API 526.

Due to the extended material test certificate the LESER LCB can be applied as LCC, WCB, WCC and 1.0619
with the respective pressure-temperature range as well.

45

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 Type 526
Available options
Type 526

 crewed cap H2
S Packed lever H4 Plain lever H3 Open bonnet
H2 H4 H3 See Art. No.

Test gag Lift indicator Bolted cap H1 Bolted lifting device H6

J69: H4 K05: H1 J39: Adaptor for lift indicator H4 K01 K06
J70: H2 K27: H6 J93: Lift indicator

Flange drillings Outlet flange rating class 300 O-ring disc Disc with inserted sealing plate
acc. to DIN EN 1092-1 J21: CR “K” J44+S07: PTFE-FDA “A”
J22: EPDM “D” J48+S07: PCTFE “G”
J23: FKM “L” J49+S07: SP “T”
J20: FFKM “C”

Inconel bellows Bug screen Conversion kit for High temperature equipment
J83 M70 balanced bellows J88

46

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 The-Safety-Valve.com

Type 526
Available options

Type 526
NACE sour gas application INCONEL X-750 spring API Alloy Concept High pressure design
N78 X08 for orifices Q, R, T
Z90

Code
YYYY

® Code Code
XXXX ZZZZ

Butt-weld connection Heating jacket LESER Original Spare Parts Kits UREA Synthesis section
S05 see page 54 safety valve

Studs and nuts material Balanced piston design

L8D SA-193 B7M K10
L9D SA-194 2HM

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 Type 526
Flange drillings according to DIN EN 1092-1
Type 526

Standard API 526 Article number Flange drillings

Material Inlet Inlet Outlet Outlet
Valve Flange
WCB LCB WC6 CF8M NPS PN PN PN PN PN PN PN PN PN NPS PN PN PN PN PN
size class
5262. 5263. 5267. 5264. [DN] 10/16 25 40 63 100 160 250 320 400 [DN] 10 16 25 40 63

1 D 2 300 x 1501) 002* 501* 006* 011* 25 H47 H47 H47 – – – – – – 50 H15 H15 H15 H15 –

1D2 600 x 150 003* 502* 007* 012* 25 – – – H10 H17 – – – – 50 H15 H15 H15 H15 –

1 /2 D 2 1500 x 300 004* 503* 008* 013*

1
40 – – – – – H11 H12 – – 50 H15 H15 H15 H15 –

1 /2 D 3 2500 x 300 005* 504* 009* 014*

1
40 – – – – – – H12 H13 – 80 H15 H15 H15 H15 H16

1E2 300 x 1501) 016* 506* 020* 025* 25 H47 H47 H47 – – – – – – 50 H15 H15 H15 H15 –

1E2 600 x 150 017* 507* 021* 026* 25 – – – H10 H17 – – – – 50 H15 H15 H15 H15 –

1 /2 E 2 1500 x 300 018* 508* 022* 027*

1
40 – – – – – H11 H12 – – 50 H15 H15 H15 H15 –

1 /2 E 3 2500 x 300 019* 509* 023* 028*

1
40 – – – – – – H12 H13 – 80 H15 H15 H15 H15 H16

11/2 F 2 300L x 150 030* 511* – 040* 40 H47 – – – – – – – – 50 H15 H15 H15 H15 –

11/2 F 2 300 x 150 031* 512* 035* 041* 40 – H47 H47 – – – – – – 50 H15 H15 H15 H15 –

1 /2 F 2 600 x 150 032* 513* 036* 042*

1
40 – H47 H47 – – – – – – 50 H15 H15 H15 H15 –

1 /2 F 3 1500 x 300 033* 514* 037* 043*

1
40 – – – H10 H17 H11 H12 – – 80 H15 H15 H15 H15 H16

11/2 F 3 2500 x 300 034* 515* 038* 044* 40 – – – – – – H12 H13 – 80 H15 H15 H15 H15 H16

11/2 G 3 300L x 150 046* 517* – 111* 40 H47 – – – – – – – – 80 H15 H15 H15 H15 –

1 /2 G 3 300 x 150 047* 518* 052* 112*

1
40 – H47 H47 H10 – – – – – 80 H15 H15 H15 H15 –

11/2 G 3 600 x 150 048* 519* 053* 113* 40 – – – H10 H17 H11 – – – 80 H15 H15 H15 H15 –

11/2 G 3 900 x 300 049* 520* 054* 114* 40 – – – – H17 H11 – – – 80 H15 H15 H15 H15 H16

2 G 3 1500 x 300 050* 521* 055* 115* 50 – – – – – – H12 H13 – 80 H15 H15 H15 H15 H16

2 G 3 2500 x 300 051* 522* 056* 116* 50 – – – – – – – – H14 80 H15 H15 H15 H15 H16

11/2 H 3 300L x 150 143* 524* – 153* 40 H47 H47 H47 – – – – – – 80 H15 H15 H15 H15 –

2H3 300 x 150 144* 525* 148* 154* 50 – – H47 H10 – – – – – 80 H15 H15 H15 H15 –

2H3 600 x 150 – – 149* – 50 – – H47 H10 – – – – – 80 H15 H15 H15 H15

2H3 600 x 150 145* 526* – 155* 50 – – H47 H10 – – – – – 80 H15 H15 H15 H15 H16

2H3 900 x 150 146* 527* 150* 156* 50 – – – – H17 H11 – – – 80 H15 H15 H15 H15 H16

2 H 3 1500 x 300 147* 528* 151* 157* 50 – – – – – H11 H12 – – 80 H15 H15 H15 H15 H16

2J3 300L x 150 163* 530* – 197* 50 H47 H47 H47 H10 – – – – – 80 H15 H15 H15 H15 –

3J4 600 x 150 165* 532* 169* 199 * 80 – – H47 H10 – – – – – 100 H51 H51 H51 H51 –

3J4 900 x 150 166* 533* 170* 200* 80 – – – – H17 H11 – – – 100 H51 H51 H15 H15 H16

3J4 1500 x 300 167* 534* 171* 201* 80 – – – – – H11 H12 – – 100 H51 H51 H15 H15 H16

1)
300L x 150 is available with the same Article-No.

Note: Flange drillings and facings meet always the requirements of mentioned flange standards. Flange thickness and outer diameter may be thicker and wider than
flange standard. For correct selection of bolting please refer to LDeS 3007.01. The inlet pressure size CL150 is not considered, please switch to inlet pressure
size CL300 or CL300L.

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 The-Safety-Valve.com

Type 526
Flange drillings according to DIN EN 1092-1

Type 526
Standard API 526 Article number Flange drillings
Material Inlet Inlet Outlet Outlet
Valve Flange
WCB LCB WC6 CF8M NPS PN PN PN PN PN PN PN PN PN NPS PN PN PN PN PN
size class
5262. 5263. 5267. 5264. [DN] 10/16 25 40 63 100 160 250 320 400 [DN] 10 16 25 40 63

3 K 4 300 x 1501) 203* 536* 207* 212* 80 H47 H47 H47 H10 – – – – – 100 H51 H51 H15 H15 –

3K4 600 x 150 204* 537* 208* 213* 80 – – H47 H10 – – – – – 100 H51 H51 H15 H15 –

3K6 900 x 150 – – 209* – 80 – – – H10 H17 H11 H12 – – 150 H51 H51 – – –

3K6 900 x 150 205* 538* – 214* 80 – – – H10 H17 H11 H12 – – 150 H51 H51 H15 H15 –

3 K 6 1500 x 300 206* 539* 210* 215* 80 – – – H10 H17 H11 H12 – – 150 H51 H51 H15 H15 –

3L4 300L x 150 233* 541* – 243* 80 H47 H47 H47 H10 – – – – – 100 H15 H15 H15 H15 –

4L6 300 x 150 234* 542* 238* 244* 100 H45 H47 H47 H10 – – – – – 150 H51 H51 – – –

4L6 600 x 150 235* 543* 239* 245* 100 – – – H10 H17 H11 – – – 150 H51 H51 – – –

4L6 900 x 150 236* 544* 240* 246* 100 – – – – H17 H11 – – – 150 H51 H51 – – –

4L6 1500 x 300 237* 545* 241* – 100 – – – – – – H12 – – 150 H51 H51 – – –

4 M 6 300 x 150 1)
581* 547* 584* 588* 100 H45 H47 H47 H10 – – – – – 150 H51 H51 – – –

4M6 600 x 150 582* 548* 585* 589* 100 – – – H10 H17 H11 – – – 150 H51 H51 – – –

4M6 900 x 150 583* 549* 586* – 100 – – – – H17 H11 – – – 150 H51 H51 – – –

4 N 6 300L x 1501) 591* 551* 594* 598* 100 H45 H47 H47 H10 – – – – – 150 H51 H51 – – –

4N6 600 x 150 592* 552* 595* 599* 100 – – – – H17 H11 – – – 150 H51 H51 – – –

4N6 900 x 150 593* 553* 596* – 100 – – – – – – – – – 150 H51 H51 – – –

4 P 6 300L x 150 646* 555* – 654* 100 H45 H47 H47 – – – – – – 150 H51 H51 – – –

4P6 300 x 150 647* 556* 550* 655* 100 – H47 H47 – – – – – – 150 H51 H51 – – –

4P6 600 x 300 648* 557* 551* 656* 100 – – – H10 H17 – – – – 150 H51 H51 – – –

4P6 900 x 300 649* 558* 552* – 100 – – – – – H11 – – – 150 H51 H51 – – –

6Q8 300 x 150 658* 560* 660* 663* 150 H45 H47 H47 – – – – – – 200 H50 H51 H52 – –

6Q8 600 x 150 659* 561* 661* 664* 150 – – – H10 H17 – – – – 200 H50 H51 H52 – –

6 R 8 300L x 150 666* 563* 669* 672* 150 H45 H47 H47 H10 – – – – – 200 H50 H51 H52 – –

6 R 10 300 x 150 667* 564* – 673* 150 – – H47 H10 – – – – – 250 H50 H51 – – –

6 R 10 600 x 150 668* 565* 670* 674* 150 – – H47 H10 H17 – – – – 250 H50 H51 – – –

8 T 10 300 x 1501) 676* 567* 677* 679* 200 – H46 H47 – – – – – – 250 H50 H51 – – –

1)
300L x 150 is available with the same Article-No.

Note: Flange drillings and facings meet always the requirements of mentioned flange standards. Flange thickness and outer diameter may be thicker and wider than
flange standard. For correct selection of bolting please refer to LDeS 3007.01. The inlet pressure size CL150 is not considered, please switch to inlet pressure
size CL300 or CL300L.

49

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 Type 526
Outlet flange rating class 300
Type 526

For customer specifications requiring a flange rating class 300 at the outlet LESER provides Type 526 with outlet flange rating class
300. For ordering please state the article numbers and option codes which are listed in the table.

Valve size
300 x 300 600 x 300
Inlet x Outlet
Orifice Body material
Center to face
Art. No. Option code Art. No. Option code
axb

WCB 1.0619 5262.002X H65, H80, S01 5262.003X H65, H80, S01
1" x 2"
CF8M 1.4408 5264.011X H65, H80, S01 5264.012X H65, H80, S01
D
WC6 1.7357 5267.006X H65, H80, S01 5267.007X H65, H80, S01
4 1/8" x 4 1/2"
LCB 5263.501X H65, H80, S01 5263.502X H65, H80, S01
WCB 1.0619 5262.004X H65, H80 5262.004X H67, H80
1 1/2" x 2"
CF8M 1.4408 5264.013X H65, H80 5264.013X H67, H80
D
WC6 1.7357 5267.008X H65, H80 5267.008X H67, H80
4 1/8" x 5 1/2"
LCB 5263.503X H65, H80 5263.503X H67, H80
WCB 1.0619 5262.016X H65, H80, S01 5262.017X H65, H80, S01
1" x 2"
CF8M 1.4408 5264.025X H65, H80, S01 5264.026X H65, H80, S01
E
WC6 1.7357 5267.020X H65, H80, S01 5267.021X H65, H80, S01
4 1/8" x 4 1/2"
LCB 5263.506X H65, H80, S01 5263.507X H65, H80, S01
WCB 1.0619 5262.018X H65, H80 5262.018X H67, H80
1 1/2" x 2"
CF8M 1.4408 5264.027X H65, H80 5264.027X H67, H80
E
WC6 1.7357 5267.022X H65, H80 5267.022X H67, H80
4 1/8" x 5 1/2"
LCB 5263.508X H65, H80 5263.508X H67, H80
WCB 1.0619 5262.031X H65, H80 5262.032X H67, H80
1 1/2" x 2"
CF8M 1.4408 5264.041X H65, H80 5264.041X H67, H80
F
WC6 1.7357 5267.035X H65, H80 5267.036X H67, H80
4 7/8" x 6"
LCB 5263.512X H65, H80 5263.512X H67, H80
WCB 1.0619 5262.049X H65, H80 5262.049X H67, H80
1 1/2" x 3"
CF8M 1.4408 5264.114X H65, H80 5264.114X H67, H80
G
WC6 1.7357 5267.054X H65, H80 5267.054X H67, H80
4 7/8" x 6 1/2"
LCB 5263.520X H65, H80 5263.520X H67, H80
WCB 1.0619 5262.146X H65, H80 5262.146X H67, H80
2" x 3"
CF8M 1.4408 5264.156X H65, H80 5264.156X H67, H80
H
WC6 1.7357 5267.150X H65, H80 5267.150X H67, H80
6 1/16" x 6 3/8"
LCB 5263.527X H65, H80 5263.527X H67, H80
WCB 1.0619 5262.166X H65, H80 5262.166X H67, H80
3" x 4"
CF8M 1.4408 5264.200X H65, H80 5264.200X H67, H80
J
WC6 1.7357 5267.170X H65, H80 5267.170X H67, H80
7 1/4" x 7 1/8"
LCB 5263.533X H65, H80 5263.533X H67, H80

Grey marked safety valves: The center to face dimensions are equal to API standard 526 with outlet flange rating class 150.

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 The-Safety-Valve.com

Type 526
Outlet flange rating class 300

Type 526
Valve size
300 x 300 600 x 300
Inlet x Outlet
Orifice Body material
Center to face
Art. No. Option code Art. No. Option code
axb

WCB 1.0619 5262.204X H65, H80 5262.204X H67, H80

3" x 4"
CF8M 1.4408 5264.213X H65, H80 5264.213X H67, H80
K
WC6 1.7357 5267.208X H65, H80 5267.208X H67, H80
7 1/4" x 7 1/8"
LCB 5263.537X H65, H80 5263.537X H67, H80
WCB 1.0619 5262.235X H65, H80 5262.235X H67, H80
4" x 6"
CF8M 1.4408 5264.245X H65, H80 5264.245X H67, H80
L
WC6 1.7357 5267.239X H65, H80 5267.239X H67, H80
7 3/4" x 8 1/2"
LCB 5263.543X H65, H80 5263.543X H67, H80
WCB 1.0619 5262.582X H65, H80 5262.582X H67, H80
4" x 6"
CF8M 1.4408 5264.589X H65, H80 5264.589X H67, H80
M
WC6 1.7357 5267.585X H65, H80 5267.585X H67, H80
7 3/4" x 8 1/2"
LCB 5263.548X H65, H80 5263.548X H67, H80
WCB 1.0619 5262.592X H65, H80 5262.592X H67, H80
4" x 6"
CF8M 1.4408 5264.599X H65, H80 5264.599X H67, H80
N
WC6 1.7357 5267.595X H65, H80 5267.595X H67, H80
7 3/4" x 8 1/2"
LCB 5263.552X H65, H80 5263.552X H67, H80
4" x 6" WCB 1.0619 5262.647X S01 5262.648X S01
Welded
outlet flange CF8M 1.4408 5264.655X S01 5262.656X S01
P
WC6 1.7357 5267.650X S01 5262.651X S01
8 7/8" x 11 5/8"
LCB 5263.556X S01 5262.557X S01
6" x 8" WCB 1.0619 5262.658X S01 5262.658X S01
Welded
outlet flange CF8M 1.4408 5264.663X S01 5264.663X S01
Q
WC6 1.7357 5267.660X S01 5267.660X S01
9 7/16" x 12"
LCB 5263.560X S01 5263.560X S01
6" x 10" WCB 1.0619 5262.667X S01 5262.667X S01
Welded
outlet flange CF8M 1.4408 5264.673X S01 5264.673X S01
R
WC6 1.7357 5267.670X S01 5267.670X S01
9 7/16" x 13 1/5"
LCB 5263.564X S01 5263.564X S01
8" x 10" WCB 1.0619 5262.676X S01
Welded
outlet flange CF8M 1.4408 5264.679X S01
T
WC6 1.7357 5267.677X S01
10 7/8" x 13 1/5"
LCB 5263.567X S01

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 Type 526
Outlet flange rating class 300
Type 526

900 x 300 1500 x 300 2500 x 300

Orifice
Art. No. Option code Art. No. Option code Art. No. Option code

E Outlet flange rating class 300

is standard flange rating class
acc. to API standard 526
E

G
5262.147X
5264.157X
H Class 1500 x 300
5267.151X
5263.528X
5262.166X H68, H80
5264.200X H68, H80
J
5267.170X H68, H80
5263.533X H68, H80
5262.204X H68, H80
5264.213X H68, H80
K
5267.209X H68, H80
5263.537X H68, H80

Welded outlet flange rating class 300

L available on request.

M Design details
Orifice D and E:
1 D 2 and 1 E 2 class 300 x 300 and 600 x 300 are realised
by a separate cast model.
N Orifice L:
4 L 6 class 900 x 300 and 1500 x 300 can be realised
by a welded outlet flange on request.
P Orifice M – P:
4 M 6, 4 N 6 and 4 P 6 class 900 x 300 can be realised
by a welded outlet flange on request.
Orifice P – T:
Q 4 P 6 up to 8 T 10 are realised by a welded outlet flange class 300.
Center to face:
The center to face dimensions a and b for LESER Type 526 with outlet flange rating
R
class 300 are not specified in API Standard 526. The actual dimensions are listed in
the table. They differ from the dimensions which are specified in API 526 for safety
T valves with outlet flange class 150. Exceptions see page 50.

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 The-Safety-Valve.com

Type 526
Flange facings

Type 526
Acc. to DIN EN 1092
Inlet Outlet Remark
Flange facing PN 10 – PN 63 – PN 10 – Rz-data according to
PN 63
(see also WI 3313.40) PN 40 PN 400 PN 40 DIN EN 1092 in µm

Raised face
Type B1
* –
* – Facing: Rz = 12.5 – 50
Type B2 L36
* L38
* Facing: Rz = 3.2 – 12.5
Tongue face C1) S05 H92
Groove face D1) S05 H91
Male face E S05 H98
Female face F S05 H99
O-ring male face G S05 S01
O-ring female face H S05 S01
Acc. to ASME B16.5
Smooth finish2) Serrated finish RTJ-Groove
Body
Inlet Outlet Inlet Outlet Inlet Outlet Inlet Outlet
material
Option code Option code CL300 CL600 CL900 CL1500 CL2500 CL150 CL300
All All All L52 L53
* * L58 H63
1)
 ESER manufactures the groove at flanged valves by milling. If a customer demands a turned surface in the soil of the groove according to DIN 2512 and / or DIN EN 1092-1
L
an additional option code is necessary: “S01: bottom of the groove drilled”. 2) Smooth finish is not defined in the effective standards.

Note: Flange drillings and facings meet always the requirements of mentioned flange standards.
Flange thickness and outer diameter may vary from flange standard.

Stud-bolts length for flange connection inlet and outlet

All LESER safety valves Type 526 need at the inlet side longer stud-bolts for the flange connections as stated in ASME B16.5, due to the full nozzle design.
Furthermore, due to the actual castings the stud bolts at the outlet can differ from ASME B16.5 as well.
LESER state the stud-bolt length in LDeS 3001.29. For calculation of stud-bolts length the measure “s” stated on page 12 – 15 can be used.

Connection acc. to API Standard 526 – 1984

Valve size Flange rating class
Orifice Option code
Inlet Outlet Inlet
D/E 1 /2"
1
3", drilled 2 /2"
1
CL2500 S01
F 1 1/2" 3", drilled 2 1/2" CL900 S01
G 1 1/2" 3", drilled 2 1/2" CL150 – 900 S01
J 2 1/2" 4" CL900 – 1500 S01
K 2 1/2" 6" CL900 – 1500 S01

General information concerning flange drillings and flange facings

Flange dimensions of LESER Type 526 exceed flange dimension as mentioned in ASME / ANSI B16.5 and DIN EN 1092. This
exceedance is in accordance with API Standard 526, Section 2.4. Dimensions: “For some valve designs, the inlet raised face height
may substantially exceed the nominal dimension specified in ASME / ANSI B16.5 (and DIN EN 1092). Consult the manu­facturer for
Dimensions exact dimension.”
The reason for this exceedance is:
– height of nozzle placed in the inlet of valve
– due to the outer diameter of the nozzle thread flange thickness has to be thicker than normal ASME / ANSI B16.5
and DIN EN 1092 dimension to achieve the required pressure rating
Multiple
The flange standard shows the same drilling, facing and outer diameter for several pressure ratings, e.g. PN 16 up to PN 40 Due
pressure
to the pressure rating of the casting LESER fulfills the requirements for flange thickness e.g. of PN 16 but not PN 40
rating

The effective MSS SP-6 (Edition 2001) does not mention “smooth finish” anymore.
In MSS SP-6 (Edition 1980) “smooth finish” is defined for finishes of contact flanges as “250 μinch (6.3 μm) AARH max.”. LESER
Smooth supplies flange facings according to ASME B16.5 – 1996, paragraph 6.4.4.3:
Finish “Either a serrated concentric or serrated spiral finish resulting in service finish from 125 μinch to 250 μinch average
roughness shall be furnished.” This finish meets the requirements of MSS SP-6 (Edition 1980), which is not valid anymore!
Stock finish is not defined in any technical standard. If purchase orders show “stock finish” LESER supplies standard facing
Stock Finish
according to DIN or ASME (marked with * in table “Flange facings” of each valve series).

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 Type 526
LESER Original Spare Parts Kits
Type 526

The LESER Spare Parts Kits contain all the parts recommended
for the regular maintenance of a LESER safety valve.

Content
Item Component Material Quantity

1.4571
7.5 Securing ring (Disc) 1
316Ti
1.4404
14 Split ring 2
316L
1.4401
57 Ball 15
316
1.4571
59 Securing ring1) 1
316Ti
Graphite / 1.4401
60 Gasket2) 3
Graphite / 316
1.4401
61 Ball 1
316
1.4401
66 Screw 1
316
Gasket 1.4401
73.2 1
(Lock screw) 316
1)
Kits 5012.1118 and 5012.1119: Kits don’t contain securing ring due to re-usable ring bush in the safety valve.
2)
Kit 5012.1109: Three additional gaskets are enclosed for use in type 5267 (WC6).

Article numbers
Inlet flange rating class of the safety valve
Orifice
CL150 CL300L CL300 CL600 CL900 CL1500 CL2500

D
5012.1101 5012.1102
E

F 5012.1103

G 5012.1104 5012.1121

H 5012.1105 5012.1106

J 5012.1107 5012.1108

K 5012.1109 5012.1110

L 5012.1111 5012.1112

M 5012.1113

N 5012.1114

P 5012.1115 5012.1116

Q 5012.1117

R 5012.1118 5012.1119

T 5012.1120

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Type 526
Approvals

Type 526
Orifice D E–T
Europe Coefficient of discharge Kdr
PED/DIN EN ISO 4126-1 Approval No. 07 202 1111Z0012/2/26
12/2013 S/G 0.45 0.80
L 0.32 0.58
Germany Coefficient of discharge w

PED/AD 2000-Merkblatt A2 Approval No. TÜV SV 1082

07/2012 S/G 0.45 0.80
L 0.32 0.58
United States Coefficient of discharge K
ASME Sec. VIII Div. 1 Approval No. M37246 M37224
Rated slope
S/G
acc. to ASME VIII. Div. 1 UG-131 (d) (2)
0.801
G: 1.99 SCFM/psia
S: 5.59 lb/hr/psia
Approval No. M37257 M37235
Rated slope
L acc. to ASME VIII. Div. 1 UG-131 (d) (2) 0.579
3.11 GPM/√psid
Canada Coefficient of discharge K
Canada: CRN Approval No. For current approval no. see www.leser.com
Rated slope
S/G
acc. to ASME VIII. Div. 1 UG-131 (d) (2)
0.801
G: 1.99 SCFM/psia
S: 5.59 lb/hr/psia
Rated slope
L acc. to ASME VIII. Div. 1 UG-131 (d) (2) 0.579
3.11 GPM/√psid
China Coefficient of discharge w

AQSIQ Approval No. For current approval no. see www.leser.com

S/G 0.45 0.80
L 0.32 0.58
Eurasian Custom Union Coefficient of discharge w

EAC Approval No. For current approval no. see www.leser.com

S/G 0.45 0.80
L 0.32 0.58
Classification societies Homepage
Bureau Veritas BV www.bureauveritas.com
Det Norske Veritas DNV www.dnv.com The valid certification number is changed
Germanischer Lloyd GL www.gl-group.com with every renewal.
Lloyd‘s register EMEA LREMEA www.lr.org For a sample certificate including the valid
U.S. Coast Guard U.S.C.G www uscg.org certification number see www.leser.com
ClassNK NIPPON Kaiji Kyokai (Japan) www.classnk.or.jp

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 LESER worldwide
LESER UK André Ramseyer AG LESER Germany LESER Poland LESER China
Bristol Flamatt, Switzerland Hamburg and Poznan Tianjin, Peking
sales@leser.co.uk info@ramseyer.ch Hohenwestedt leser@leser.pl and Shanghai
sales@leser.com sales.china@leser.com

LESER Russia
Moscow
sales.ru@leser.com

LESER USA LESER France

Charlotte (NC) Toulouse
salesus@leser.com contact@leser.fr
LESER Singapore
Singapore
sales@leser.com.sg

LESER Brazil
Rio de Janeiro
vendas@leser.com.br LESER Bahrain LESER UAE LESER India
Al Manamah Dubai Mumbai and Paithan
salesme@leser.com sales.uae@leser.com sales@leser.co.in

LESER representatives

LESER stock and local assembly

API Type 526

Edition April 2018
0777.5489

The-Safety-Valve.com
LESER GmbH & Co. KG 20537 Hamburg, Wendenstr. 133-135 Fon +49 (40) 251 65-100 E-Mail: sales@leser.com
20506 Hamburg, P.O. Box 26 16 51 Fax +49 (40) 251 65-500 www.leser.com

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