Series 240 Pneumatic On/off Valve Type 3351

Application Control valve with a tight shutoff of liquids, gases and steam in accordance with DIN or ANSI standards Nominal sizes DN 15 to 100 NPS to 4 Nominal pressure PN 16 to 40 Class 150 and 300 Ambient temperatures 35 to 100 C 30 to 212 F Medium temperatures 50 to 250 C 58 to 482 F

The Type 3351 Pneumatic Control Valve consists of an on/off valve and a pneumatic actuator. Optionally, the valve can be equipped with a bellows seal or insulating section. Valve body made of: Cast iron Spheroidal graphite iron Cast steel Cast stainless steel Metal-seated and soft-seated valve plug together Leakage class VI in accordance with IEC 60534-4 or leakage class VI according to ANSI/FCI 70-2 Attachment of solenoid valves and limit switches according to IEC 60534-6 and NAMUR recommendation. For details, see Information Sheet T 8350 EN. Versions Standard version for nominal pressures PN 10 to 40 or Class 150 and 300 with fail-safe action "valve CLOSED" or "valve OPEN" Type 3351-1 (Fig. 1) On/off valve with self-adjusting PTFE V-ring packing in nominal sizes DN 15 to 100 (NPS to 4) for medium temperatures from 10 to 220 C (14 to 428 F) Type 3351-1 Version with bellows seal On/off valve with metal bellows seal and V-ring packing in nominal sizes DN 15 to 50 (NPS to 2) for medium temperatures as listed in Table 1 Type 3351-1 Version with insulating section On/off valve with insulating section, plug stem sealed with PTFE V-ring packing, nominal sizes DN 15 to 50 (NPS to 2) for medium temperatures as listed in Table 1 Other versions With additional handwheel With reinforced spring For higher or lower medium temperatures For higher ambient temperatures
Fig. 1 Type 3351-1 Pneumatic On/off Valve

Fig. 2 Type 3351-1 Pneumatic On/off Valve, Version with handwheel

Associated Information Sheets Associated Data Sheets for pneumatic actuators

T 8000-x EN T 8130-1/-2

Edition November 2012

Data Sheet

T 8039 EN

Principle of operation Depending on the type of valve seat and the arrangement of the valve plug, the control valve features two different fail-safe actions which are used when the pressure acting on the diaphragm is reduced or when the control signal fails: Fail-close action The valve is closed upon supply air failure. Fail-open action The valve is opened upon supply air failure.

Direction of flow The direction of the medium flow in the valve depends on the process medium and the selected fail-safe action. For valves with fail-close action for applications with gases and vapors, the direction of flow in the closing direction (A B) applies, except for the DN 100 version for which the direction of flow in the opening direction (B A) is prescribed. For liquids, the medium must flow in the opening direction (B A). For valves with fail-open action, the medium flows in the opening direction (A B) regardless of the medium type. Using the optional handwheel, valves with fail-close action can be opened in case of a supply air failure, and valves with fail-open action can be closed.

Fig. 4 Type 3351-1 Pneumatic On/off Valve with handwheel

Fig. 3 Detailed drawing of the insulating section

Fig. 5 Type 3351-1 Pneumatic On/off Valve version with bellows seal

T 8039 EN

Table 1 Technical data

Version Body material Nominal pressure Nominal size Standard Bellows seal/ insulating section Cast iron EN-JL 1040 PN 10, 16 Spheroidal graphite iron EN-JS 1049 PN 10, 16, 25 DN 15 to 100 DN 15 to 50 Form B acc. to DIN EN 1092-1 Form B1 acc. to DIN EN 1092-1 DIN Cast steel 1.0619 Stainless cast steel 1.4408 Cast steel A 216 WCC ANSI Cast stainless steel A 351 CF8M

PN 10, 16, 25, 40

Class 150 and 300 NPS to 4 NPS to 2 RF

Connecting flanges

Temperature ranges in C (F) Permissible operating pressures acc. to the pressure-temperature diagrams (see Information Sheet T 8000-2 EN) Ambient temperature Medium temperature High-temperature version Low-temperature version Leakage class
1) 2) 3) 4)

35 to 100 C (30 to 212 F) 10 to 220 C (14 to 428 F) 10 to 240 C (14 to 464 F) 1) 50 to 220 C (58 to 428 F) IEC 60534-4: Class VI

35 to 100 C (30 to 212 F) 10 to 220 C (14 to 428 F) 10 to 240 C (14 to 464 F)1) 4) 29 to 220 C (20 to 428 F) 4) 50 to 220 C (58 to 428 F) 3) 4)

ANSI/FCI 70-2: Class VI

With soft-seated special plug and bellows seal or insulating section Higher temperatures (max. 450 C/842 F) with metal-seated plug and leakage class IV or V on request Additional impact test certification required between 29 C (20 F) and 50 C (58 F) With bellows seal or insulating section only

Table 2 Materials
Valve Body Seat Plug Body gasket Actuator diaphragm Standard version Valve bonnet Guide bushing Packing Threaded bushing assembly Version with bellows seal or insulating section Bellows seal or insulating section Actuator flange Guide bushing Sealing Guide nut Flange of bellows seal or insulating section Cast iron EN-JL 1040 1.0460 Cast steel 1.0619 Fiber-reinforced plastic Bellows seal: Bellows 1.4571 and PTFE/graphite V-ring packing Spring 1.4310 Insulating section: PTFE/graphite V-ring packing Spring 1.4310 1.4404 and fiber-reinforced plastic 1.0460 1.4301 316L and fiber-reinforced plastic A105 304 1.4404 A105 Cast steel A 216 WCC 316L Spheroidal graphite iron EN-JS 1049 Spheroidal graphite iron EN-JS 1049 1.4104 1.4404 + carbon Cast steel 1.0619 Valve bonnet 1.4571/1.4404 welded to bonnet 1.0619 1.4404 V-ring packing PTFE with carbon Spring 1.4310 316L + carbon Cast steel A 216 WCC 1.4104 Valve bonnet 316L, welded to bonnet A 216 WCC 316L Cast iron EN-JL 1040 Spheroidal graphite iron EN-JS 1049 1.4006 DIN Cast steel 1.0619 Stainless cast steel 1.4408 1.4404/1.4571 Graphite on metal core NBR (nitrile rubber) with fabric reinforcement Materials for higher ambient temperatures on request Cast steel A 216 WCC A182 F6a CL2 ANSI Cast stainless steel A 351 CF8M 316Ti/316L

1.4404 Seat ring made of reinforced PTFE

T 8039 EN

Table 3 Control pressure and maximum differential pressure All pressures in bar and psi
Nominal size
(bellows seal or insulating section up to DN 50/NPS 2)

DN NPS Kvs
Cv

15 6.3 7.5

20 10 12 60 8

25 1 14 16

32 25

40 1 31 36 186 10 6 bar/88 psi

50 2 40 47

65 2 72 84 255 12.5

80 3 90 105

100 4 170 200 700 30

Flow rate Pneumatic actuator Standard version Fail-close

Effective area in cm Travel in mm

Max. supply pressure

Min. control pressure to open the valve at Dpmax Max. perm. diff. pressure Dpmax Fail-open Min. control pressure to close the valve at Dpmax Max. perm. differential pressure Dpmax with vapors, gases, liquids Min. control pressure to open the valve at Dpmax Max. perm. differential pressure Dpmax with vapors, gases, liquids 1)
1)

4 bar/58 psi 20 bar/290 psi 16 bar/235 psi 16 bar/235 psi 10 bar/145 psi 4.5 bar/65 psi 20 bar/290 psi 16 bar/235 psi 10 bar/145 psi 10 bar/145 psi 5 bar/73 psi 10 bar 145 psi 4 bar/ 58 psi

Vapor, gas A B Liquids B A

Special version of fail-close version for increased differential pressure Dp 5.5 bar/80 psi 30 bar/435 psi 20 bar/290 psi 7 bar/102 psi

For direction of flow B A (see Fig. 4)

Table 4 Dimensions for Type 3351

Valve PN 10/40 Length L Class 150 Class 300 Diaphragm diameter Loading pressure connection Standard version H1 H2 H3 H4 H2 H3
1) 1) 1)

DN NPS mm in mm in in mm a mm mm mm mm mm mm

15 130

20 150 7.25 184

25 1 160

32 180

40 1 200 8.75 222 9.25 235 240 G 285 72 380 415 80 535

50 2 230 10 254 10.50 267

65 2 290 10.88 276 11.50 292 280

80 3 310 11.75 298 12.50 318 G 38 328 98 415

100 4 350 13.86 352 14.49 368 390

7.50 191

7.63 194 150 G 260 45 380 400 55 520

7.75 197

485 118 565

Version with bellows seal or insulating section

Minimum clearance for removing the actuator; version with handwheel: add 150 mm for DN 80 or smaller; add 210 mm for DN 100

Table 5 Weights for Type 3351

Standard version DN NPS Weight, approx. kg PN 10/40 Class 150 Class 300 PN 10/40 Class 150 Class 300 15 11 11 12 16 16 17 20 12 12 13 17 17 18 25 1 12 13 14 17 18 19 32 25 33 40 1 26 23 25 34 31 33 50 2 29 27 29 37 35 37 65 2 48 47 50 80 3 52 52 52 100 4 70 64 64

Version with bellows seal or insulating section Weight, approx. kg

T 8039 EN

260 D

D a

Ordering text Type 3351 Pneumatic On/off Valve Nominal size DN/NPS Nominal pressure PN/Class Body material According to Table 1 Fail-safe action Fail-close or fail-open Control pressure ... bar Handwheel Without / with Special versions Bellows seal/insulating section Version for high or low temperatures Accessories Solenoid valve and/or electric or pneumatic limit switch

169 a H3

H3 H4

H1

B H2 L

B H2 L

Fig. 6 Dimensional drawings

Specifications subject to change without notice.

T 8039 EN

SAMSON AG MESS- UND REGELTECHNIK Weismllerstrae 3 60314 Frankfurt am Main Germany Phone: +49 69 4009-0 Fax: +49 69 4009-1507 Internet: http://www.samson.de

T 8039 EN

2012-11