The

High
Performance
Company

BUTTERFLY VALVES
RESILIENT SEATED

SERIES 30/31 Wafer/Lug

50mm-500mm (2"- 20")

SERIES 30

50mm500mm (2"20")
Bray Controls is proud to
offer a high quality line of
butterfly valves to meet the
requirements of todays market.
Combining years of field
application experience, research
and development, Bray has
designed many unique features
in the Series 30/31 not previously available. The results
are longer service life, greater
reliability, ease of parts replacement and interchangeability of
components.

DISC AND STEM CONNECTION

(A) Features a high-strength through stem
design. The close tolerance, double D
connection that drives the valve disc is an
exclusive feature of the Bray valve.
It eliminates stem retention components
being exposed to the line media, such as
disc screws and taper pins, which commonly result in leak paths, corrosion, and
vibration failures. Disc screws or taper
pins, due to wear and corrosion, often

STEM BUSHING (D)

Non-corrosive, heavy duty
acetal bushing absorbs
actuator side thrusts.

C
I

STEM SEAL (E)

Double U cup seal design
is self-adjusting and gives
positive sealing in both directions. Prevents external
substances from entering the
stem bore.

D
E
F
A
J

NECK (F) Extended neck

length allows for 2" of piping
insulation and is easily accessible for mounting actuators.

G
G

STEM RETAINING ASSEMBLY (C)

The stem is retained in the body by means
of a unique Stainless Steel Spirolox
retaining ring, a thrust washer and two
C-rings, manufactured from brass as
standard, stainless steel upon request. The
retaining ring may be easily removed with
a standard hand tool. The stem retaining
assembly prevents unintentional removal
of the stem during field service.
Double D Connection

require difficult machining for disassembly. Disassembly of the Bray stem is just
a matter of pulling the stem out of the
disc. Without fasteners obstructing the
line flow, the Series 30/31 Cv values are
higher than many other valves, turbulence
is reduced, and pressure recovery is
increased. The stem ends and top
mounting flange are standardized for
interchangeability with Bray actuators.

Spirolox
Retaining Ring

PRIMARY AND
SECONDARY SEALS (G)
The Primary Seal is achieved
by an interference fit of the
moulded seat flat with the
disc hub. The Secondary Seal
is created because the stem
diameter is greater than the
diameter of the seat stem
hole. These seals prevent
line media from coming in
contact with the stem or
body.
BRAY UNIQUE SEAT DESIGN (H)
One of the valves key elements is Brays
unique tongue and groove seat design.
This resilient seat features lower torque
than many valves on the market today
and provides complete isolation of
flowing media from the body. The
tongue-and-groove seat to body retention
method is superior to traditional designs,
making field replacement simple and fast.
The seat is specifically designed to seal
with slip-on or weld-neck flanges. The
seat features a molded O-ring which
eliminates the use of flange gaskets.
An important maintenance feature is that
all resilient seats for Bray butterfly valves
Series 20, 21, 30, 31 and 34 are
completely interchangeable.

Thrust Washer
Stem Retaining
C-Rings

DISC (B) Casting is spherically machined

and hand polished to provide a bubbletight shut off, minimum torque, and
longer seat life. The disc O.D. clearance is
designed to work with all standard piping.

*Spirolox designation is a registered

trademark of Kaydon Ring and Seal, Inc.

Tongue and Groove

Design

ACTUATOR MOUNTING FLANGE

AND STEM CONNECTION (I)
Universally designed to ISO 5211 for
direct mounting of Bray power actuators
and manual operators.
FLANGE LOCATING HOLES (J)
Provide quick and proper alignment
during installation.
BODY (K) One-piece wafer or lug style.
Polyester coating for excellent corrosion
resistance. Bray valve bodies meet 12 bar
pressure ratings for hydrostatic test
requirements.

DESIGN FEATURES

POLYESTER COATING CORROSION

PROTECTION Brays standard product
offers valve bodies with a polyester coating, providing excellent corrosion and
wear resistance to the valves surface.
The Bray polyester coating is a hard,
gloss red finish.
Chemical Resistance resists a broad
range of chemicals including: dilute
aqueous acids and alkalies, petroleum
solvents, alcohols, greases and oils.
Offers outstanding resistance to humidity
and water.
Weatherability outdoor tested resistant
to ultra-violet radiation.
Abrasion Resistance excellent
resistance to abrasion.
Impact Resistance withstands impact
without chipping or cracking.

Brays Series 30 valve is a wafer version

with flange locating holes, and the
Series 31 is the companion lug version for
dead-end service and other flange requirements. All Bray valves are tested to 110%
of full pressure rating before shipment.
A major design advantage of Bray valve
product lines is international compatibility. The same valve is compatible
with most world flange standards - BS
EN 1092-1, PN 10/16, DIN ND, ANSI
125/150, BS10 Table D/E, AS 2129. In
addition the valves are designed to
comply with ISO 5752 face-to-face and
ISO 5211 actuator mounting flanges.
Therefore, one valve design can be used
in many different world markets.

Due to a modular concept of design,

all Bray handles, manual gear
operators and pneumatic and
electric actuators mount
directly to Bray valves.
No brackets or adapters
are required.

NYLON 11 COATING
Optionally available for valve bodies
where outstanding protection and
performance is needed. A thermoplastic
produced from a vegetable base, this
coating is inert to fungus growth and
molds. Nylon 11 is USDA Approved,
as well as certified to ANSI / NSF 61 for
water service.
Corrosion Resistance superior resistance
to a broad range of chemical environments. Salt spray tested in excess of 2,000
hours and seawater immersion tested for
over 10 years without corrosion to metal
substrates.
Nylon 11 features a very low coefficient
of friction and excellent resistance to
impact and ultra-violet radiation.

Bray interchangeability
and compatibility offers you
the best in uniformity of
product line and low-cost
performance in the
industry today.

DIMENSIONS

Lug Bolting Data*

50

94

43

51

72

140

90

70

9.5

14

10

32

2 1/2 106

46

64

85

152

90

70

9.5

14

10

32

Mounting Flange Drig.

PCD

No.
Holes

Hole
Dia.

PCD

33

51

125

M16

49

59

145

M16

No. ISO Count

Holes Threads

80

124

46

76

102 159

90

70

9.5

14

10

32

65

67

160

M16

100

154

52

102 131 178

90

70

9.5

16

11

32

91

87

180

M16

125

181

56

127 156 190

90

70

9.5

19

13

32

118

107

210

M16

150

206

56

146 178 203

90

70

9.5

19

13

32

138

120

240

M20

200

267

60

197 241 241

150 125

14

22

16

32

189

153

295

M20

250

10

324

68

248 291 273

150 125

14

30

22

50

242

188

350

12

M20

300

12

378

78

298 342 311

150 125

14

30

22

50

291

213

400

12

M20

KEY
SIZE

430

78

337

388

346

150

35

51 10x10 331 238

460

16

M20

16

M24

Valve Size
mm ins
350

See chart for

Actuator Mounting
Flange Drilling.

SERIES 31 Lug

Valve Size
mm ins

65

PCD
Lug
Valve

SERIES 30 Wafer

14

Mounting Flange Drig.

PCD

No.
Holes

Hole
Dia.

125

14

Lug Bolting Data*

PCD

No. ISO Count

Holes Threads

400

16

484

102

387

442

375

150

125

14

35

51 10x10 337 273

515

450

18

537

108

438

495

406

210

165

21

50

64 10x12 428 305

565

20

M24

500

20

591

127

489

548

438

210

165

21

50

64 10x12 475 348

620

20

M24

Actuator Mounting Flange ISO recess dimensions.

50mm-150mm valves
F07
200mm-400mm valves
F12
450mm-500mm valves
F16

*NOTE: Lug bolting data for

PN10 rated valves. For PN16
ratings, please consult factory.

SELECTION DATA

FLANGE
REQUIREMENTS
Bray valves are designed for
installation between ISO PN 10/
16, DIN ND, ANSI
125/150, BS10 Table D/E and
AS 2129 weld neck or slip-on
flanges, either flat faced or
raised faced. While weld-neck
flanges are recommended, Bray
has specifically designed its
valve seat to work with slip-on
flanges, thus eliminating
common failures of other
butterfly valve designs. When
using raised face flanges be sure
to properly align valve and
flange. Type C stub-end flanges
are not recommended.

Cv VALUESVALVE SIZING COEFFICIENT

Valve Size

Disc Position (degrees)

90

80

70

60

50

40

30

20

50

144

114

84

61

43

27

16

65

2 1/2

282

223

163

107

67

43

24

11

1.5

80

461

364

267

154

96

61

35

15

100

841

701

496

274

171

109

62

27

125

1376

1146

775

428

268

170

98

43

150

1850

1542

1025

567

354

225

129

56

200

3316

2842

1862

1081

680

421

241

102

12

250

10

5430

4525

2948

1710

1076

667

382

162

19

300

12

8077

6731

4393

2563

1594

1005

555

235

27

350

14

10538

8874

5939

3384

2149

1320

756

299

34

400

16

13966 11761

7867

4483

2847

1749

1001

397

45

450

18

17214 14496 10065

5736

3643

2237

1281

507

58

500

20

22339 18812 12535

7144

4536

2786

1595

632

72

mm ins

10

Cv is defined as the volume of water in U.S.G.P.M. that will flow through a given restriction or
valve opening with a pressure drop of one (1) p.s.i. at room temperature. Recommended control
angles are between 2570 open. Preferred angle for control valve sizing is 6065 open.

Weld-Neck

Slip-On

EXPECTED SEATING/UNSEATING TORQUES (Nm)

3.5

P (Bar)
10

12

Reduced
Disc Diameter
P (Bar)
3.5

Valve
Size
PRESSURE RATINGS*
For bi-directional bubble-tight shut off,
disc in closed position:

mm ins

Full-Rated Pressure Valves

50

14

15

15

16

65

2 1/2

22

23

24

25

30

31

33

34

20

45

48

51

53

30

mm

Inches

bar

psig

80

50-300

2-12

12

175

100

350-500

14-20

10

150

125

70

76

82

86

47

150

91

104

114

119

61

200

168

187

207

217

112

250

10

254

286

318

334

170

300

12

388

440

491

516

259

350

14

562

647

733

375

400

16

727

875

1022

485

450

18

897

1124

1352

598

500

20

1170

1465

1760

780

For Dead-end Service Applications:

With downstream flanges installed the

dead-end pressure ratings are equal to
valve bi-directional ratings as stated
above. With no downstream flanges the
dead-end pressure rating for 50mm300mm valves is 5 bar (75 psi) for
350mm-500mm valves it is 3.5 bar
(50psi).
*Pressure Ratings are based on standard disc
diameters. For low pressure application, Bray offers
a standard reduced disc diameter to decrease seating
torques and to extend seat life, thus increasing the
valves performance and reducing actuator costs for
the customer.

VELOCITY LIMITS
For On/Off Services:
Fluids 9m /s (30 ft / sec)
Gases 54m /s (175 ft / sec)

Valve Torque Rating Bray has classified valve torque ratings according to 3 types: non-corrosive
lubricating service, general service, and severe service. Torques listed above are for general services.
Consult Bray for torque information corresponding to specific applications.
TO USE TORQUE CHART, NOTE THE
FOLLOWING:
1) For Bray valves, Series 20, 21, 30, 31 and 34.
2) Review Technical Bulletin No. 1001, Expected
Seating/Unseating Torques, for explanation of the
three service classes and their related seating/
unseating torque values for given pressure
differentials of Full-Rated and Reduced Disc
Diameter valves.

3) Dynamic Torque values are not considered.

See Technical Bulletin No. 1002 for evaluation of
Dynamic Torque values vs. Seating/Unseating
Torque values.
4) Safety factor included, but may vary dependant
of process conditions - consult factory.

SPECIFICATIONS

RECOMMENDED SPECIFICATIONS FOR BRAY

SERIES 30/31 SHALL BE:
Polyester coated, cast iron,
wafer or lug bodies.
With flange locating holes
that meet ANSI Class 125/150,
BS10 Tables D/E, BS4504 NP
10/16, DIN ND10/16 and AS
2129.
Through-stem direct drive
double D design requiring no
disc screws or pins to connect
stem to disc with no possible leak
paths in disc/stem connection.
Stem mechanically retained in
body neck and no part of stem or
body exposed to line media.
Tongue-and-groove seat design
with primary hub seal and a
moulded O-ring suitable for
weld-neck and slip-on flanges.
Seat totally encapsulates the body
with no flange gaskets required.
Spherically machined, hand polished
disc edge and hub for minimum torque
and maximum sealing capability.
Equipped with non-corrosive bushing and
self-adjusting stem seal.
Bi-directional and tested to 110% of
full rating.
No field adjustment necessary to maintain
optimum field performance.
The valve shall be Bray Series 30 wafer /
31 lug or equal.

WEIGHTS
Valve Size
mm ins

Series
30

50

2.95

65

2 1/2

3.86

80

4.31

100

5.44

125

7.26

150

9.07

200

15.90

250

10

22.70

300

12

39.50

350

14

53.50

400

16

83.90

450

18

96.20

500

20

139.00

MATERIALS SELECTION

TEMPERATURE RANGE OF SEATS

50mm-500mm (2"20")
Type
Maximum
Minimum
BODY:
EPDM
121C (+250F) -40C (-40F)
Cast Iron ASTM A126 Class B
Buna-N 100C (+212F) -18C (0F)
Ductile Iron DIN 1693 GGG403
FKM*
204C (+400F) -18C (0F)
(ASTM -A395 Grade 60-40-18)
Carbon Steel ASTM A216 WCB
Aluminum ASTM B26
9
SEAT:
Buna-N Food Grade
8
EPDM Food Grade
7
FKM*
White Buna-N Food Grade
6
STEM:
416 Stainless Steel ASTM A582 Type 416
304 Stainless Steel ASTM A276 Type 304
5
316 Stainless Steel ASTM A276 Type 316
Monel K500
DISC:
Aluminum Bronze ASTM B148-954
Ductile Iron, Nylon 11 Coated, ASTM A536 Gr. 65-45-12
Ductile Iron, Halar Coated, ASTM A536 Gr. 65-45-12
316 Stainless Steel ASTM A351 CF8M
Nickel Aluminium Bronze UNS95800 (ASTM B148)
Others on request
4
COMPONENTS
No.

Qty.

Body

Description

Seat

Disc

Stem

Stem Seal

Stem Bushing

Stem Retainer

Thrust Washer

Retaining Ring

Weights are in kgs.

*FKM is the ASTM D1418 designation for Fluorinated Hydrocarbon Elastomers

(also called Fluoroelastomers).
Hastelloy is a registered trademark of Haynes International, Inc.
Halar is a registered trademark of Ausimont U.S.A., Inc.

ASSEMBLY

INSTALLATION
Position the disc in the partially
open position, maintaining the
disc within the body face-toface. Place the body between
the flanges and install flange
bolts. Do not use flange gaskets.
Before tightening flange bolts,
carefully open the disc to the
full open position to ensure
proper alignment and clearance
of the disc O.D. with the adjacent pipe I.D. Leave disc in the
full open position and tighten
flange bolts per required
specification. Once bolts are
tightened, carefully rotate disc to closed
position to ensure disc O.D. clearance.
MAINTENANCE AND REPAIR
The many Bray features minimize wear
and maintenance requirements. No routine
lubrication is required. All components
stem, disc, seat, bushing, stem seal, etc.,
are field replaceable, no adjustment is
needed. If components require replacement, remove the valve from the line by
placing the disc near the closed position,
spread the flanges, support the valve,
then remove the flange bolts. No valve
maintenance, including removal of
manual or power actuators, should be
performed until the piping system is
completely depressurized.

Disc in the Partially Open Position

Disc in the Full Open Position

DISASSEMBLY
Remove the handle, gear operator, or
actuator from actuator mounting flange.
Remove Spirolox retaining ring.
Remove stem with its thrust washer and
two C-ring stem retainers. Remove
bushing and seal. Remove the disc from
the seat, protecting disc edge at all times.
Push the seat into an oval shape, then
remove the seat from the body.

in the disc must be toward the bottom of

valve body. (Take special care when
lining disc up with stem.) With a downward pressure and rotating the stem back
and forth, push the stem until the stem
touches the bottom of the body stem hole.
Make certain that when pushing the stem
through disc bottom, the broached flats of
stem and disc are aligned. After the stem
has engaged the disc, but before the stem
is firmly seated in the body, replace the
stem seal and bushing. Install the two
C-ring stem retainers in the groove in
the stem and thrust washer on top of the
C-rings. Seat the stem firmly in the body
and install the Spirolox retaining ring
back into position.

ASSEMBLY
Push the valve seat into an oval and push
it into the body with seat stem holes
aligned to body stem holes. Push stem
into the stem hole of body. For aid in
inserting disc, slightly protrude stem
beyond the I.D. of the top of the seat.
Install a light coating of foodgrade
silicone oil (for silicone free applications
use soap and water) on the I.D. of seat.
Insert the disc into the seat by lining up
the disc hole with the stem hole of the
seat. Note: the broached double D flats

DISTRIBUTOR
Disc in the Near Closed Position

All statements, technical information, and recommendations in this bulletin are for general use only.
Consult Bray representatives or factory for the
specific requirements and material selection for
your intended application. The right to change or
modify product design or product without prior
notice is reserved.
United States patent number 5,152,501.
Other patents issued and applied for worldwide.
Bray is a registered trademark of BRAY INTERNATIONAL, Inc.

CONTROLS (UK)

A Subsidiary of BRAY INTERNATIONAL, Inc.

16 -18 Fountain Cresent, Inchinnan Business Park
Inchinnan PA4 9RE Scotland
Tel:+44(0)141 812 5199 Fax: +44(0)141 812 6199 www.bray.com
2004 Bray International. All rights reserved.
B-1002 7/04