Valve Standard

Triple-offset Butterfly Valves are designed in accordance with key international standards. They also meet the requirements of major oil & gas and power industry standards/ customer specifications.

Parameter Standard
Design API 609 (Category B),
ASME B16.34
Ends Wafer/ Wafer Lugged Face-to-face API 609
End Flange Dimensions ASME B16.5
Flanged Face-to-face API 609/ ISO 5752 Ser. 13/
Ser. 14/ Ser. 8
End Flange Dimensions ASME B16.5/ ASME B16.47
Butt-weld End-to-end ASME B16.10
End Dimensions ASME B16.25
Testing API 598
Pressure – Temperature Rating ASME B16.34

Triple – Offset Geometry

In Triple-offset Butterfly Valves, the shaft is offset from the sealing surface and body centreline. Further the sealing cone is rotated away from the bore centreline to create a third offset.

The triple-offset geometry ensures that the body and disc come into contact only at the final shut-off position. This eliminates wear and tear due to interference, reduces operating torque and enhances product life.

Triple – Offset Sealing System

Offset #1:  The Shaft is Offset from the seat plane providing an uninterrupted
seating surface.
Offset #2: Centerline of disc is Offset from the centerline of the shaft
allowing the seal to freely lift off and away from the seat on
opening.
Offset #3: The cone axis is Offset from the centerline of the seal to provide a
conical sealing surface that allows the seal to rotate in and out of
the seat without interference.
No Components Materials
WCB/
WCC
LCB/
LCC
WC6/
WC9
C5

1

Body
A 216 Gr. WCB/ WCC A 352 Gr. LCB/ LCC A 217 Gr. WC6/ WC9 A 217 Gr. C5

2

Disc
A 216 Gr. WCB/ WCC A 352 Gr. LCB/ LCC A 217 Gr. WC6/ WC9 A 217 Gr. C5

3

Laminar Seal
UNS S31803 + Graphite/,UNS S20910 + Graphite SS 410 + Graphite/,UNS S20910 + Graphite

4

Retainer
A 516 Gr. 70 SS 316 SS 410 SS 410/ SS 316

5

Shaft
A 479 Type SS 410/,A 564 Type 630 A 479 Type S20910/,A 564 Type 630 A 479 Type SS 410 A 479 Type SS 410/,A 479 Type S20910

6

Packing
Graphite - 5 Braided
rings / Graphite - 3 moulded and 2 braided rings / PTFE

7

Key
SS 410/ 17-4-PH UNS S20910 /,17-4-PH SS 410 SS
410/ UNS S20910

8

Dowel Pin
SS 410/ 17-4-PH UNS S20910 /,17-4-PH SS 410 SS
410/ UNS S20910

9

Bearing
SS
316/ UNS S20910 Nitrided

10

Thrust Plate
SS
316/ UNS S20910 Nitrided

11

Bottom Cover
A 516 Gr. 70 SS 316 / A 516 Gr. 70 SS 410 SS 410/ SS 316

12

Bearing Protector
Graphite

13

Gasket - Disc
SS 316 / 316L with
Graphite

14

Gasket - Cover
SS 316 / 316L with
Graphite

15

Gear Unit
Worm type
(self-locking)

16

Bolting
A 193 Gr. B7/,A 194 Gr. 2H A 320 Gr. L7/,A 194 Gr. 7 A 193 Gr. B16/,A 194 Gr. 7 A 193 Gr. B16/,A 194 Gr. 7
Body seat hard-faced with Stellite 21 or 6
Features and Benefits

 Available inventory includes sizes 2”-24”.Larger sizes (26”-48”+) are available upon request.
 Standard body materials are 316 SST or WCB. Application specific options include: Alloy 20, Monel, CD3MN, Hastelloy C-276, Inconel 625, Aluminum Bronze, LCB and others.
 ANSI/ASME Class 150 and 300 Lug and Wafer
 Standard seat materials are RTFE, RTFE/316L SST (Firesafe), and 316L SS (metal seat). Application specific seat materials include: 50/50 STFE, PTFE, PEEK, UHMWPE, TFM-1600 and Inconel 625.
 Standard Stem Material is 17-4 pH. Other options include 316 SST or XM-19.
 RTFE and Firesafe seat designs offer bubble-tight, bi-directional shutoff to full ANSI/ASME Class 150 and 300 standards.Metal seat design offers Class V shutoff.

Seat Design

PS Series

 RTFE seat for bubble-tight shutoff of general purpose applications up to 450°F.*

PF Series

 Primary RTFE seat for bubble-tight shutoff backed up by secondary 316L SST fire-safe seat. Secondary fire-safe seat provides Class V shutoff when primary RTFE seat is compromised in a fire event.*

PM/PH Series

 316L SST seat for Class V shutoff of high temperature applications to 660°F (1100°F with Inconel 625 seat and 316 SST with Stellite disc).*

Seat Packing

Graphite (G)

 RTFE seat for bubble-tight shutoff of general purpose applications up to 450°F.*

PTFE V-Ring (P)

 Live Loaded PTFE Chevron packing for standard applications that are not compatible with graphite.

PTFE Inverted V-Ring (V)

 Live Loaded Inverted PTFE Chevron packing will facilitate vacuum service applications

PTFE Pressure & Vacuum V-Ring (D)

 Live Loaded PTFE Chevron packing comes together with Inverted PTFE Chevron packing to support applications of pressure and vacuum

Triple-offset Butterfly Valves - Short Pattern


Size
Class 150 Class-300
NPS DN A B C ZN ZF Wt A B C ZN ZF Wt.

3

80

114

265

130

30

114

265

130

50

4

100

127

275

140

35

127

275

150

70

6

150

140

300

160

45

8

45

140

390

200

125

28

80

8

200

152

415

205

128

28

65

152

455

230

180

46

125

10

250

165

475

240

182

45

110

165

490

253

235

66

165

12

300

178

510

265

235

65

150

178

545

295

275

78

216

14

350

190

560

305

265

75

190

190

585

335

291

77

305

16

400

216

590

335

294

78

250

216

625

375

336

105

380

18

450

222

585

360

345

100

280

222

680

405

395

120

420

20

500

229

670

395

380

115

385

229

755

455

476

150

530

24

600

267

725

475

475

145

570

267

910

530

513

155

1040

26

650

292

760

475

515

156

600

292

920

530

564

185

1060

28

700

292

820

495

555

180

760

292

950

565

595

190

1440

30

750

318

930

585

595

185

845

318

970

625

655

211

1450

32

800

318

1000

640

677

224

860

318

1082

665

699

235

1720

34

850

330

1025

650

706

235

1060

330

1130

695

699

235

1960

36

900

330

1030

675

740

250

1100

330

1192

745

762

235

2035

38

950

410

1055

690

752

238

1240

410

1120

715

815

261

2460

40

1000

410

1145

745

783

250

1657

410

1140

735

868

290

2750

42

1050

410

1200

795

867

285

1871

410

1220

775

994

335

3275

48

1200

470

1385

905

980

320

2858

470

1405

885

5100

54

1350

530

1365

950

1110

369

3800

60

1500

600

1450

1040

1240

402

4600

64

1600

600

1700

1150

1271

416

6080

100

2500

700

2550

1745

2270

865

23500