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General Plug Valve (Double block & bleed valve), ASME Class 150 / 300 / 600 / 900 lb
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General Plug Valve (Double block & bleed valve), ASME Class 150 / 300 / 600 / 900 lb


 Plug valves are valves with round or conically tapered "plugs" which may be rotated within the valve body to manage flow with the valve. The plugs in plug valves have a number of hollow passageways going sideways with the plug, to ensure that fluid can flow with the plug once the valve is open. Plug valves are pretty straight forward and frequently economical.

 Introduction

Double block & bleed valve (DBBV) is a non-lubricated, resilient seal, plug-type valve which has a mechanical means of freeing the plug before it is rotated from the closed to the open position.

In opening the valve, the plug is raised, thus retracting the seating segments or slips through their tapered dovetail connections. Only after the slips are fully retracted from the body seat is the plug rotated to the open position.

Conversely, in closing the valve, the plug and slips are rotated freely, with no seal-to-body contact until the slips are positioned over the ports.

Then the plug is driven down between the slips and the tapered surfaces wedge out the slips for a positive upstream as well as downstream shut-off.

Double block & bleed valve (DBBV)

The small DBB general plug valve is handwheel operated, and require up to 3 turns to open or close. Up to 2 3/4 turns expand or retract the slips, while turn rotates the plug. Large valves operate in a similar manner, except that they have enclosed weather-proof worm gearing.

At the top of the valve, a position indicator flag shows the exact plug position. It appears in line with the flow when the valve is open and perpendicular to the flow when the valve is closed.

Since DBBV hold bubble-tight, for ease of opening in liquid service, it is important to prevent trapped body pressure from exceeding the working pressure of the valve.

Therefore, a relief system is required to prevent pressure buildup in the body cavity.

For maximum upstream sealing, do not back off the hand wheel.
Warning: Do not over torque by using cheater bars.

Double block & bleed valve (DBBV)

Pressure Test

ASME Class

150

300

600

900

Result

Shell Test Pressure
  (Valve Open)

(Pisg)
  (kg/cm2)

500
  35

1200
  85

2250
  158

3350
  235

No Leakage Permitted

Seat Test Pressure

(Pisg)

300

800

1600

2400

Test upstream & downstream

(Valve Closed)

(kg/cm2)

21

56

113

168

Seats. No leakage permitted

Supplementary (API 598)
  Air Seat Test Pressure

(Pisg)

80

80

80

80

Test upstream & downstream

(Valve Closed)

(kg/cm2)

6

6

6

6

Seats. No leakage permitted

Structure of Short Pattern with Handle Wheel

Structure of Short Pattern with Handle Wheel

1

2

3

4

5

6

7

8

9

10

Body

Cover

Bearing

Drain valve

O-ring

Spiral
  Wounded
  Gasket

Stud

Nut

Plug

Disc

11

12

13

14

15

16

17

18

19

20

Upper Cover

Upper
  Bearing

Seal ring

O-ring

Packing

Packing
  Gland

Yoke

Slide
  Bushing

Stem

Hand Wheel

Structure of Short Pattern with Gear

Structure of Short Pattern with Gear

1

2

3

4

5

6

7

8

9

10

Body

Lower Cover

Non-lubricated
  bearing

Drain Valve

O-ring

FS Gasket

Stud

Nut

Plug

Disc

11

12

13

14

15

16

17

18

19

20

Upper Cover

Stem

FS Packing

Pin

Inner Hex
  Screw

Block

Stud

Nut

Driving device

Seal Ring

Structure of Reduced Bore Type with Gear

Structure of Reduced Bore Type with Gear

1

2

3

4

5

6

7

8

9

10

Body

Lower Cover

Non-lubricated
  bearing

Drain Valve

O-ring

FS Gasket

Stud

Nut

Plug

Disc

11

12

13

14

15

16

17

18

19

20

Upper Cover

Stem

FS Packing

Pin

Inner Hex
  Screw

Packing
  Gland

Block

Stud

Nut

Handwheel

21

22

23

24

25

26

27

28

29

30

Seal Ring

Guiding Bush

Shaft Bushing

Indicating Arm

Set Screw

Pointer

Nut

Stud

Handwheel

Pin

31

32

33

34

35






Seal Ring

Inner Hex
  Screw

FS Packing

Bearing

Drain Valve






Structure of Full Bore Type with Gear

Structure of Reduced Bore Type with Gear

1

2

3

4

5

6

7

8

9

10

Body

Lower Cover

Non-lubricated
  Bearing

Drain Valve

O-ring

FS Gasket

Stud

Nut

Plug

Disc

11

12

13

14

15

16

17

18

19

20

Upper Cover

Stem

FS Packing

Pin

Inner
  Hex Screw

Emgency seal device

Plug

Bolt

Nut

Driving Device

21

22

23

24

25

26

27

28

29

30

Seal Ring

Guiding Bush

Bearing

Indicating
  Arm

Set Screw

Pointer

Nut

Bolt

Hand Wheel

Pin

31

32

33

34

35






Inner
  Hex Screw

Inner
  Hex Bolt

FS Packing

Bearing

Drain Valve






Structure of Gear

Structure of Reduced Bore Type with Gear

NO.

Name

1

Yoke

2

Driving Stem

3

Driving Bushing

4

Worm Gear

5

Gear Stem

6

Box

7

Bearing Seat

8

Box Cover

9

Indicating Arm

10

HW

11

Lever

12

End cover

13

Gasket

14

Lockable Nut

15

Locking Nose

16

Lock Pad

17

Cover Cap

18

Nut

19

Stud

20

Bolt

21

Bolt

22

Lock screw

23

Bolt

24

Bolt

25

O-ring

26

O-ring

27

O-ring

28

O-ring

29

O-ring

30

Normal Key

31

Normal Key

32

Shaft Washer

33

Oil Cup

34

Bearing

35

Bearing

Materials

Materials of Double block & bleed valve (DBBV)

Number

Name

Material

1

Body

Casting steel ASTM A216 WCB,
  body inside Cr plated

Casting steel ASTM A352 LCB,
  body inside Cr plated

Casting steel
  ASTM A351 Cf8

2

Upper cover

Forged steel ASTM A105

Forged steel ASTM A105

Forged steel ASTM A182 F304

3

Lower corer

Casting steel ASTM A216 WCB

Casting steel ASTM A352 LCB

Casting steel ASTM A351 CF8

4

Stem

ASTM A182 F6a

ASTM A182 F6a

ASTM A182 F6a

5

Plug

Casting steel ASTM A216 WCB,
  surface ENP

Casting steel ASTM A352 LCB,
  surface ENP

Casting steel ASTM A351 Cf8

6

Disc

A536 65-45-12

A536 65-45-12

Casting steel ASTM A351 Cf8

7

Seal ring

Viton

Viton

Viton

8

Packing

Expanded graphite

Expanded graphite

Expanded graphite

9

O-ring

Viton

Viton

Viton

10

Stud

ASTM A 193 B7

ASTM A 193 B7

ASTM A 193 B8

11

Nut

ASTM A 194 2H

ASTM A 194 2H

ASTM A 194 8

Dimension of Short Pattern with Handwheel

Dimension of Short Pattern with Handwheel

Class

NPS

A

d

g

c

o

T

E

N-ΦD

H

H1

G

Wt

Cv

150

2

178

50

92

120.7

150

14.3

2

4-19

470

135

250

26

190

3

203

76

127

152.4

190

17.5

2

4-19

517

159

300

34

254

4

229

100

157.2

190.5

230

22.3

2

8-19

573

185

400

72

582

6

267

150

215.9

241.3

280

23.9

2

8-22.5

712

215

450

107

1360

8

292

201

269.9

298.5

345

27

2

8-22.5

760

288

500

210

2250

300

2

216

50

92

127

165

20.7

2

8-19

470

135

250

30

201

3

283

76

127

168.3

210

27

2

8-22.5

530

159

350

43

265

4

305

100

157.2

200

255

30.2

2

8-22.5

577

185

450

86

610

6

403

150

215.9

269.9

320

35

2

12-22.5

712

220

550

180

1680

600

2

292

50

92

127

165

25.4

7

8-19

515

139

350

52

275

3

356

76

127

168.3

210

31.8

7

8-22.5

530

159

400

77

290

4

432

100

157.2

215.9

275

38.1

7

8-25.5

618

190

500

120

830

PN

DN

A

d

9

c

0

T

E

N-ΦD

H

H1

G

Wt

Cv

1.6

50

178

50

100

125

160

16

3

4-18

470

135

250

26

190

80

203

76

135

160

195

20

3

8-18

517

159

300

34

254

100

229

100

155

180

215

20

3

8-18

573

185

400

72

582

150

267

150

210

240

280

24

3

8-22

712

215

450

107

1360

200

292

201

265

295

335

26

3

12-23

760

288

500

210

2250

2.5

50

216

50

100

125

160

20

3

4-18

470

135

250

30

201

80

283

76

135

160

195

22

3

8-18

530

159

350

43

265

100

305

100

160

190

230

24

3

8-23

577

185

450

86

610

150

403

150

218

250

300

30

3

8-25

712

220

550

180

1680

4.0

50

216

50

100

125

160

20

3

4-18

470

135

250

30

201

80

283

76

135

160

195

22

3

8-18

530

159

350

43

265

100

305

100

156

190

230

24

3

8-23

577

185

450

86

610

150

403

150

218

250

300

30

3

8-25

712

220

550

180

1680

6.3

50

292

50

105

135

175

26

3

4-23

515

139

350

52

275

80

356

76

140

170

210

30

3

8-23

530

159

400

77

290

100

432

100

168

200

250

32

3

8-25

618

190

500

120

830

10

50

292

50

112

145

195

28

3

4-25

515

139

350

52

275

80

356

76

148

180

230

34

3

8-25

530

159

400

77

290

100

432

100

172

210

265

38

4.5

8-30

618

190

500

120

830

 

Dimension of Short Pattern with Gear

Dimension of Short Pattern with Gear

Class

NPS

A

d

g

c

o

T

E

N-ΦD

H

H1

H2

G

B

Wt

Cv

150

2

178

50

92

120.7

150

14.3

2

4-19

412

155

135

320

265

35

190

3

203

76

127

152.4

190

17.5

2

4-19

429

155

159

320

265

48

254

4

229

100

157.2

190.5

230

22.3

2

8-19

454

155

185

320

265

88

582

6

267

150

215.9

241.3

280

23.9

2

8-22.5

575

185

215

460

330

126

1360

8

292

201

269.9

298.5

345

27

2

8-22.5

656

185

288

460

330

246

2250

10

330

252

323.8

362

405

28.6

2

12-25.5

734

185

333

460

330

289

3506

12

356

303

381

431.8

485

30.2

2

12-25.5

752

194

350

460

372

458

3920

14

381

334

412.8

476.3

535

33.4

2

12-28.5

808

194

385

460

372

560

5420

16

406

385

469.9

539.8

595

35

2

16-28.5

847

210

417

500

400

775

6910

300

2

216

50

92

127

165

20.7

2

8-19

412

155

135

320

265

42

201

3

283

76

127

168.3

210

27

2

8-22.5

429

155

159

320

265

55

265

4

305

100

157.2

200

255

30.2

2

8-22.5

454

155

185

320

265

88

610

6

403

150

215.9

269.9

320

35

2

12-22.5

575

185

215

460

330

185

1680

8

419

201

269.9

330.2

380

39.7

2

12-25.5

656

185

288

460

330

362

2955

10

457

252

323.8

387.4

445

46.1

2

16-28.5

734

185

333

460

330

462

3490

12

502

303

381

450.8

520

49.3

2

16-32

752

194

350

460

372

736

4630

600

2

292

50

92

127

165

25.4

7

8-19

430

180

140

320

280

54

275

3

356

76

127

168.3

210

31.8

7

8-22.5

445

180

159

320

280

80

290

4

432

100

157.2

215.9

275

38.1

7

8-25.5

525

185

190

460

330

145

830

6

559

150

215.9

292.1

355

47.7

7

12-28.5

655

194

249

460

372

360

2235

8

660

201

269.9

349.2

420

55.6

7

12-32

760

210

310

500

400

574

3550

PN

DN

A

d

g

c

o

T

E

N-ΦD

H

H1

H2

G

B

Wt

Cv

1.6

50

178

50

100

125

160

16

3

4-18

412

155

135

320

265

35

190

80

203

76

135

160

195

20

3

8-18

429

155

159

320

265

48

254

100

229

100

155

180

215

20

3

8-18

454

155

185

320

265

88

582

150

267

150

210

240

280

24

3

8-23

575

185

215

460

330

126

1360

200

292

201

265

295

335

26

3

12-23

656

185

288

460

330

246

2250

250

252

323.8

320

355

405

30

3

12-25

734

185

333

460

330

289

3506

300

303

381

375

410

460

30

3

12-25

752

194

350

460

372

458

3920

350

381

334

435

470

520

34

3

16-25

808

194

385

460

372

560

5420

400

406

385

485

525

580

36

3

16-30

847

210

417

500

400

775

6910

2.5

50

216

50

100

125

160

20

3

4-18

412

155

135

320

265

42

201

80

283

76

135

160

195

22

3

8-18

429

155

159

320

265

55

265

100

305

100

160

190

230

24

3

8-23

454

155

185

320

265

88

610

150

403

150

218

250

300

30

3

8-25

575

185

215

460

330

185

1680

200

419

201

278

310

360

34

3

12-25

656

185

288

460

330

362

2955

250

457

252

332

370

425

36

3

12-30

734

185

333

460

330

462

3490

300

502

303

390

430

485

40

3

16-30

752

194

350

460

372

736

4630

PN

DN

A

d

g

c

o

T

E

N-ΦD

H

H1

H2

G

B

Wt

Cv

4.0
  Female
  face

50

216

50

100

125

165

20

3

4-18

412

155

135

320

265

42

201

80

283

76

135

160

195

22

3

8-18

429

155

159

320

265

55

265

100

305

100

160

190

230

24

3

8-23

454

155

185

320

265

88

610

150

403

150

218

250

300

30

3

8-25

575

185

215

460

330

185

1680

200

419

201

282

320

375

38

3

12-30

656

185

288

460

330

362

2955

250

457

252

345

385

445

42

3

12-34

734

185

333

460

330

462

3490

300

502

303

409

450

510

46

4

16-34

752

194

350

460

372

736

4630

6.3
  Female
  face

50

292

50

105

135

175

26

3

4-23

430

180

140

320

280

54

275

80

356

76

140

170

210

30

3

8-23

445

180

159

320

280

80

290

100

432

100

168

200

250

32

3

8-25

525

185

190

460

330

145

830

150

559

150

240

280

345

38

3

8-34

655

194

249

460

372

360

2235

200

660

201

300

345

415

44

3

12-34

760

210

310

500

400

574

3550

10
  Female
  face

50

292

50

112

145

195

28

3

4-25

430

180

140

320

280

54

275

80

356

76

148

180

230

34

3

8-25

445

180

159

320

280

80

290

100

432

100

172

210

265

38

3

8-30

525

185

190

460

330

145

830

150

559

150

250

290

350

46

3

12-34

655

194

249

460

372

360

2235

200

660

201

312

360

430

54

3

12-41

760

210

310

500

400

574

3550

Dimension of Reduced Bore Type with Gear

Dimension of Reduced Bore Type with Gear

Class

NPS

A

d

9

c

0

T

E

N-ΦD

H

H1

H2

G

B

Wt

Cv

150

18

864

436

533.4

577.9

635

38.1

2

16-32

923

210

393

600

463

1385

10740

20

1016

487

584.2

635

700

41.3

2

20-32

958

210

436

600

463

1748

15460

24

1219

589

692.2

749.3

815

46.1

2

20-35

1121

230

492

720

488

3405

23660

30

1524

735

857.2

914.4

984

74.6

2

28-35

1269

250

590

860

770

7240

32500

36

1981

874

1022

1085.8

1168

90.4

2

4-22

1500

250

730

860

815

11198

47300

300

14

762

334

412.8

514.4

585

52.4

2

20-32

860

210

338

600

463

1080

59200

16

838

385

469.9

571.5

650

55.6

2

20-35

943

210

372

600

463

1440

9250

18

914

436

533.4

628.6

710

58.8

2

24-35

1048

230

414

720

488

1895

11320

20

990

487

584.2

685.8

775

62

2

24-35

1094

250

465

860

770

2220

16050

24

1320

589

692.2

812.8

915

68.3

2

24-41

1148

250

519

860

770

4430

26590

30

1651

735

857.2

997

1092

92

2

4-22

1435

250

590

860

815

8178

32990

600

10

787

252

323.8

431.8

510

63.5

7

16-35

919

230

336

720

488

1055

5020

12

838

303

381

489

560

66.7

7

20-35

950

230

361

720

488

1375

9160

14

889

334

412.8

527

605

69.9

7

20-38

964

230

375

720

488

2228

9400

16

991

385

469.9

603.2

685

76.2

7

20-41

1132

250

413

860

770

2338

10800

18

1029

436

533.4

654

745

82.6

7

20-44.5

1150

250

442

860

770

3566

13500

20

1194

487

584.2

723.9

815

88.9

7

24-44.5

1336

250

479

860

815

4992

16260

24

1397

589

692.2

838.2

940

101.6

7

24-51

1407

250

607

860

815

8154

2660

900

2

368

50

92

165.1

215

38.1

7

8-25.5

514

185

186

460

330

97

155

3

381

76

127

190.5

240

38.1

7

8-25.5

582

185

171

460

330

126

245

4

457

100

157.2

235

290

44.5

7

8-32

627

185

203

460

330

216

640

6

610

150

215.9

317.5

380

55.6

7

12-32

710

194

270

500

372

530

2350

8

737

201

269.9

393.7

470

63.5

7

12-38

908

230

303

720

488

618

4140

10

838

252

323.8

469.9

545

69.9

7

16-38

1068

250

356

860

770

1956

5420

1500

2

368

50

124

165.1

215

38.1

7.9

8-25.5

592

185

190

460

330

97

155

3

470

76

168

203.2

265

47.7

7.9

8-32

607

185

202

460

330

152

240

PN

DN

A

d

g

c

o

T

E

N-ΦD

H

H1

H2

G

B

Wt

Cv

1.6

450

864

436

550

585

640

40

4

20-30

923

200

393

600

463

1385

10740

500

1016

487

610

650

715

44

4

20-33

958

200

436

600

463

1748

15460

600

1219

589

725

770

840

54

5

20-36

1121

230

492

720

488

3405

23660

900

1981

874

1000

1050

1125

64

5

28-39

1500

250

730

860

815

11198

47300

2.5
  Female
  face

350

762

334

450

490

555

38

4

16-33

860

200

338

600

463

1080

59200

400

838

385

505

550

620

40

4

16-36

943

200

372

600

463

1440

9250

450

914

436

555

600

670

46

4

20-36

1048

230

414

720

488

1895

11320

500

991

487

615

660

730

48

4

20-36

1094

250

465

860

770

2220

16050

600

1143

589

720

770

845

58

5

20-39

1148

250

519

860

770

4430

26590

4.0
  Female
  face

350

762

334

465

510

580

46

4

16-36

860

200

338

600

463

1080

59200

400

838

385

535

585

660

50

4

16-39

943

200

372

600

463

1440

9250

450

914

436

560

610

685

57

4

20-39

1048

230

414

720

488

1895

11320

500

991

487

615

670

755

57

4

20-42

1094

250

465

860

770

2220

16050

600

1143

589

735

795

890

72

5

20-48

1148

250

519

860

770

4430

26590

6.3
  Female
  face

250

673

252

345

400

470

46

3

12-36

919

230

336

720

488

1055

5020

300

762

303

410

460

530

52

4

16-36

950

230

361

720

488

1375

9160

350

826

334

465

525

600

56

4

16-39

964

230

375

720

488

2228

9400

400

902

436

535

585

670

60

4

16-42

1132

250

413

860

770

2338

10800

10.0
  Female
  face

250

787

252

345

430

505

60

3

12-39

919

230

336

720

488

1055

5020

300

838

303

410

500

585

68

4

16-42

950

230

361

720

488

1375

9160

350

889

334

465

560

655

74

4

16-48

964

230

375

720

488

2228

9400

400

991

436

535

620

715

80

4

16-54

1132

250

413

860

770

2338

10800

16.0
  Female
  face

50

368

50

102

145

195

30

3

4-26

514

185

186

460

330

97

155

80

381

76

138

180

230

36

3

8-26

582

185

171

460

330

126

245

100

457

100

162

210

265

40

3

8-30

627

185

203

460

330

216

640

150

610

150

218

290

355

50

3

12-33

710

194

270

500

372

530

2350

200

737

201

285

360

430

60

3

12-36

908

230

303

720

488

618

4140

250

838

252

345

430

515

68

3

12-42

1068

250

356

860

770

1956

5420

 

Dimension of Round Hole Full bore Type with Gear

Dimension of Round Hole Full bore Type with Gear

Class

NPS

A

d

g

c

o

T

E

N- ΦD

H

H1

H2

G

B

Wt

Cv

150

2

267

50

92

120.7

150

14.3

2

4-19

424

155

158

320

265

114

525

3

343

76

127

152.4

190

17.5

2

4-19

516

175

186

320

280

171

1280

4

432

100

157.2

190.5

230

22.3

2

8-19

535

175

218

320

280

218

2330

6

546

150

215.9

241.3

280

23.9

2

8-22

662

185

258

460

330

284

5250

8

622

201

269.9

298.5

345

27

2

8-22

732

194

290

460

372

468

10800

10

660

252

323.8

362

405

28.6

2

12-26

761

194

323

460

372

693

17500

12

762

303

381

431.8

485

30.2

2

12-26

900

210

377

600

463

908

25600

14

686

334

412.8

476.3

535

33.4

2

12-29

923

210

393

600

463

1308

31400

16

762

385

469.9

539.8

595

35

2

16-29

958

210

436

600

463

1634

42500

18

864

436

533.4

577.9

635

38.1

2

16-32

1042

230

484

720

488

3098

54700

20

914

487

584.2

635

700

41.3

2

20-32

1067

230

507

7520

488

3351

70900

24

1067

589

692.2

749.3

815

46.1

2

20-35

1269

250

590

860

770

6958

106000

Class

NPS

A

d

g

c

o

T

E

N- ΦD

H

H1

H2

G

B

Wt

Cv

300

2

283

50

92

127

165

20.7

2

8-19

500

175

159

320

280

142

520

3

387

76

127

168.3

210

27

2

8-22

516

175

195

320

280

215

1250

4

457

100

157.2

200

255

30.2

2

8-22

539

175

218

320

280

238

2280

6

559

150

215.9

369.9

320

35

2

12-22

668

185

260

460

330

334

5140

8

686

201

269.9

330.2

380

39.7

2

12-26

844

210

295

600

463

682

10580

10

826

252

323.8

387.4

445

46.1

2

16-29

872

210

332

600

463

978

17100

12

965

303

381

450.8

520

49.3

2

16-32

964

230

378

720

488

1359

25000

14

762

334

412.8

514.4

585

52.4

2

20-32

982

230

408

720

488

1856

30700

16

838

385

469.9

571.5

650

55.6

2

20-35

1154

250

460

860

770

2174

41600

18

914

436

533.4

628.6

710

58.8

2

24-35

1185

250

501

860

770

3238

53600

20

991

487

584.2

685.8

775

62

2

24-35

1216

250

532

860

815

3805

69400

Class

NPS

A

d

g

c

o

T

E

N- ΦD

H

H1

H2

G

B

Wt

Cv

600

2

330

50

92

127

165

25.4

7

8-19

510

175

171

320

280

217

510

3

445

76

127

168.3

210

31.8

7

8-22

607

185

195

320

330

297

1240

4

508

100

157.2

215.9

275

38.1

7

8-26

632

185

223

320

330

331

2260

6

660

150

215.9

292.1

355

47.7

7

12-29

736

210

284

500

400

598

4640

8

794

201

269.9

349.2

420

55.6

7

12-32

919

230

336

720

488

1185

9030

10

940

252

323.8

431.8

510

63.5

7

16-35

956

230

375

720

488

1924

14790

12

1067

303

381

489

560

66.7

7

20-35

1132

250

413

860

770

2663

23080

14

889

334

412.8

527

605

69.9

7

20-39

1157

250

442

860

815

4305

29020

16

991

436

469.9

603.2

685

76.2

7

20-42

1346

250

484

860

815

5164

39300

PN

Size

A

d

g

c

o

T

E

N-ΦD

H

H1

H2

G

B

Wt

Cv

1.6

50

267

50

100

125

160

16

3

4-18

424

155

158

320

265

114

525

80

343

76

135

160

195

20

3

8-18

516

175

186

320

280

174

1280

100

432

100

155

180

215

20

3

8-18

535

175

218

320

280

218

2330

150

533

150

210

240

280

24

3

8-23

662

185

258

460

330

284

5250

200

635

201

265

295

335

26

3

12-23

732

194

290

460

372

468

10800

250

787

323.8

320

355

405

30

3

12-25

761

194

323

460

372

693

17500

300

864

381

375

410

460

30

3

12-25

900

210

377

600

463

908

25600

350

889

334

435

470

520

34

3

16-25

923

210

393

600

463

1308

31400

400

914

385

485

525

580

36

3

16-30

958

210

436

600

463

1634

42500

450

1219

436

545

585

640

40

4

20-30

1042

230

484

720

488

3098

54700

500

1219

487

608

650

705

44

4

20-34

1067

230

507

720

488

3351

70900

600

1524

589

718

770

840

48

5

20-41

1269

250

590

860

770

6958

106000

PN

Size

A

d

g

c

o

T

E

N-ΦD

H

H1

H2

G

B

Wt

Cv

2.5

50

283

50

100

125

160

20

3

4-18

500

175

159

320

280

142

520

80

387

76

135

160

195

22

3

8-18

516

175

195

320

280

215

1250

100

457

100

160

190

230

24

3

8-23

539

175

218

320

280

238

2280

150

559

150

218

250

300

30

3

8-25

668

185

260

460

330

334

5140

200

686

201

278

310

360

34

3

12-25

844

210

295

600

463

682

10580

250

826

252

332

370

425

36

3

12-30

872

210

332

600

463

978

17100

300

965

303

390

430

485

40

3

16-30

964

230

378

720

488

1359

25000

350

965

334

448

490

550

44

4

16-34

982

230

408

720

488

1856

30700

400

965

385

505

550

610

48

4

16-34

1154

250

460

860

770

2174

41600

450

1219

436

555

600

660

50

4

20-34

1185

250

501

860

770

3238

53600

500

1219

487

610

660

730

52

4

20-41

1216

250

532

860

815

3805

69400

 

PN

Size

A

d

g

c

o

T

E

N-ΦD

H

H1

H2

G

B

Wt

Cv

4.0
  Female
  face

50

283

50

100

125

165

20

3

4-18

500

175

159

320

280

142

520

80

387

76

135

160

195

22

3

8-18

516

175

195

320

280

215

1250

100

457

100

160

190

230

24

3

8-23

539

185

218

320

280

238

2280

150

559

150

218

250

300

30

3

8-25

668

210

260

460

330

334

5140

200

686

201

282

320

375

38

3

12-30

844

210

295

600

463

682

10580

250

826

252

345

385

445

42

3

12-34

872

230

332

600

463

978

17100

300

965

303

409

450

510

46

4

16-34

964

230

378

720

488

1359

25000

350

965

334

465

510

570

52

4

16-34

982

250

408

720

488

1856

30700

400

965

385

535

585

655

58

4

16-41

1154

250

460

860

770

2174

41600

PN

Size

A

d

g

c

o

T

E

N-ΦD

H

H1

H2

G

B

Wt

Cv

6.3
  Female
  face

450

1219

436

560

610

680

60

4

20-41

1185

250

501

860

770

3238

53600

500

1219

487

612

670

755

62

4

20-48

1216

175

532

860

815

3805

69400

50

330

50

105

135

175

26

3

4-23

510

185

171

320

280

217

510

80

432

76

140

170

210

30

3

8-23

607

185

195

320

330

297

1240

100

432

100

168

200

250

32

3

8-25

632

185

223

320

330

331

2260

150

559

150

240

280

345

38

3

8-34

736

210

284

500

400

598

4640

200

660

201

300

345

415

44

3

12-34

919

230

336

720

488

1185

9030

250

787

252

352

400

470

48

3

12-41

956

230

375

720

488

1924

14790

300

838

303

412

460

530

54

4

16-41

1132

250

413

860

770

2663

23080

PN

Size

A

d

g

c

o

T

E

N-ΦD

H

H1

H2

G

B

Wt

Cv

10
  Female
  face

350

991

334

475

525

595

60

4

16-41

1157

250

442

860

815

4305

29020

400

991

436

525

585

670

66

4

16-48

1346

250

484

860

815

5164

39300

50

330

50

112

145

195

28

3

4-25

510

175

171

320

280

217

510

80

432

76

148

180

230

34

3

8-25

607

185

195

320

330

297

1240

100

432

100

172

210

265

38

3

8-30

632

185

223

320

330

331

2260

150

559

150

250

290

350

46

3

12-34

736

210

284

500

400

598

4640

200

660

201

312

360

430

54

3

12-41

919

230

336

720

488

1185

9030

250

787

252

382

430

500

60

3

12-41

956

230

375

720

488

1924

14790

300

838

303

442

500

585

70

4

16-48

1132

250

413

860

770

2663

23080

350

991

334

498

560

655

76

4

16-54

1157

250

442

860

815

4305

29020

400

991

436

558

620

715

80

4

16-54

1346

250

484

860

815

5164

39300

Reduced Bore Valve Operation Opening & Closing

Open

Reduced Bore Valve Operation Opening Pic 1Reduced Bore Valve Operation Opening Pic 2Reduced Bore Valve Operation Opening Pic 3Reduced Bore Valve Operation Opening Pic 4

Closing

Reduced Bore Valve Operation Opening Pic 5Reduced Bore Valve Operation Opening Pic 6Reduced Bore Valve Operation Opening Pic 7Reduced Bore Valve Operation Opening Pic 8

Full Bore Valve Operation Opening & Closing

Open

full Bore Valve Operation Opening Pic 1Full Bore Valve Operation Opening Pic 2Full Bore Valve Operation Opening Pic 3Full Bore Valve Operation Opening Pic 4

Closing

Full Bore Valve Operation Opening Pic 5Full Bore Valve Operation Opening Pic 6Full Bore Valve Operation Opening Pic 7Full Bore Valve Operation Opening Pic 8

Pressure Relief System

To meet the requirement of API 6D, general dual seal plug valve used for the liquid must furnish one set of pressure relief system.

When twin seal plug valve closed properly and is full of the liquid. Due to the sunshine or hot environment, any tiny temperature fluctuation will result in the sharp variation of the pressure of the cavity.

Through the laboratory evidence, once the temperature raise 1°F. The pressure of full fuel will raise 75 Psi, certainly this data will be changed depending on the actual application conditions. (Subject to the medium, the container toughness exist air or not).

It is well known in the absolutely closed valve which is full of the liquid, may produce high pressure. So the twin seal plug valve used for liquid must equip with pressure bleed device.

Pressure Relief System Pic 1

Pressure Relief System Pic 2

Safe factor / DRT can basically realize the function of safe bleeding. However, actually all work parts are installed in the integral plate, The advantage of this device is fire safe, easy replacement for the whole part, all socket welding ends or joints, which may control to resulting in the accident effectively.

Manual bleed valve (MBV)

Pressure Relief System Pic 3

With the valve closed the Thermal Relief Valve releases any thermal expansion of the body liquid, back safely and automatically, to the line. Relief set at 25 Psi.*

Note: the "goose neck" pipe to prevent drainage of the body liquid.

Thermal relief to body (TRB)

Pressure Relief System Pic 4

With the valve closed the Thermal Relief Valve releasesany thermal expansion of the body liquid, back safely and automatically, to the line. Relief set at 25 Psi.*

Thermal relief to atmosphere (TRA)

Similar to TRB except thermal relief valve is set at 50 Psi above pipeline rated pressure and is vented to atmosphere.

Manual bleed valve with thermal relief (MTR)

Pressure Relief System Pic 5

The manual bleed proves drop tight sealing. The Thermal Relief Valve releases any thermal expansion of the body liquid, back safely and automatically to the line. Relief set at 25 Psi.

Manual bleed valve with gauge (MBG)

Pressure Relief System Pic 6

The manual bleed valve is combined with a gauge when emission to atmosphere is undesirable. The closing action of a valve automatically reduces body cavity pressure due to the expanding seating segments.

The gauge alone will indicate tight seals. (After a period of time, body pressure may again increase due to thermal expansion of fluid in the body cavity).

Thermal relief valve with gauge (TRG)

Pressure Relief System Pic 7

A thermal relief valve, to relieve anybody pressure which may build up due to thermal change, is combined with a gauge to indicate tight seals. No emissions to atmosphere. No sump system required. Relief set at 25 Psi.

The gauge alone will indicate tight seals. (After a period of time, body pressure may again increase due to thermal expansion of fluid in the body cavity).

*When a manual bleed or automatic bleed is fitted, the vent pipe should always be above the highest point of the valve body cavity. This will prevent liquid in the body cavity from dripping out.

Leakage past either seal would expel liquid from the already-full body cavity.

*The relief valve is set to open at 25 Psi on all valves, regardless of their working pressure.

With the valve closed, the relief valve will open at 25 Psi above upstream pressure.

This system functions only when the valve is closed and the isolation valve Is open.

CAUTION

A thermal relief system, piped back to the valve throat, converts the valve to a “DIRECTIONAL" valve. Thermal relief should always be piped back to the upstream side.

If It were piped to the downstream, any leakage past the main seal on the "up" side would be permitted to by-pass the "down" seal, by way of the directional check valve.

Thermal relief systems are designed to relieve excess pressure rise in the body cavity of a closed valve due to ambient temperature causing expansion of the liquid in the valve.

Some fluid is emitted at each actuation. A sump system is important as fluid will spurt out as the valve approaches the closed position and the cam opens the ABV. The spurting will cease as valve is fully closed for positive verification of double sealing.

Note: All automated valves require some form of body pressure relief. TRB/TRA/MTR/ABV/TRG

In normal service, the manual bleed is kept closed, unless to check for tightness or to vent thermal pressure rise. With automatic bleed or thermal relief back-to-line, the manual isolation valve that is attached to the body must always be open, except for maintenance. If the isolation valve is closed, the relief system cannot operate.

 


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