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Forged Check Valves

Pressure Seal Swing Check Valves

No penetration of hinge pin to outside eliminating possibility of pin seal leakage and allowing for in-line service.
Compact cage unit: all moving parts are attached to the carrier and can be removed easily for service.
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Features and benefits

Diantai's proven pressure seal design.

● No penetration of hinge pin to outside eliminating possibility of pin seal leakage and allowing for in-line service.

● Compact cage unit: all moving parts are attached to the carrier and can be removed easily for service.

● Forged seat/disc is CoCr alloy, ground and lapped to a mirror finish for maximum erosion resistance and long service life. It is seal-welded to the body.

● Disc can partially rotate for tight shutoff. In the fully open position, it rests against a stop.

● CoCr alloy bearings for hinge pin.

● Easy in-line service. All parts are easily accessible for maintenance. Seating faces can be re-lapped.

● Forged bonnet.

● Size range(s)

● NPS 1/2 - 24
(DN 50 - 600)

● Pressure rating

● ASME Class
900 - 2500

● Standard connections

● Socket weld, Butt weld


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CLASS 600~2500 PRESSURE SEALING SWING CHEEK VALVE

Pressure sealing cover, swing type disc

Threaded or welded seat ring

ASTM A216 WCB,A217 Wc6,A351 Cf8,A351 CF8M,

A351 Cf3,A351 CF3M,A351 CN7M

Standards compliance

Design and Manufacture: ANSIB16.34,API 6D,BS1868

Face to face(end to end): ANSIB16.10,API 6D

Flanged connection: 2~~24~to ANSIB16.5

Butt welded end: ANSIB16.25

Test and inspection: API 598,API 6D

A. Back up ring: Absorbs thrust applied by internal pressure.

B. Thrust ring: Protects the soft metallic gasket.

C. Gasket Unique angular design provides superior sealing.


Materials List

NO.

Part name

Material

16

Split pin

Stainless steel

15

Washer

Stainless steel

14

Disc pin

CS/SS

13

Hinge pin

CS/SS

12

Seat ring

CS+SS/SS/SS+STL(see   body materials)

11

Disc

CS+SS/SS/SS+STL(see   body materials)


NO.

Part name

WCB

LCB

WC6

WC9

10

Yoke stud &nut

A193 Gr B7/A194   Gr 2H

A320 Gr L7/A194   Gr 4

A193 Gr B16/A194   Gr 4/7

A193 Gr B16/A194   Gr 4/7

09

Cover stud &nut

A193 Gr B7/A194   Gr 2H

A320 Gr L7/A194   Gr 4

A193 Gr B16/A194   Gr 4/7

A193 Gr B16/A194   Gr 4/7

08

Gasket

Soft iron

Soft iron

SS304

SS304

07

Thrust ring

A182 F6a

A182 F304

A182 F11

A182 F22

06

Back up ring

A182 F6a

A182 F304

A182 F11

A182 F22

05

Yoke

A216 Gr WCB

A352 Gr LCB

A217 Gr WC6

A217 Gr WC9

004

Hinge

A216 Gr WCB

A352 Gr LCB

A217 Gr WC6

A217 Gr WC9

03

Cover

A216 Gr WCB

A352 Gr LCB

A217 Gr WC6

A217 Gr WC9

02

Bonnet

A216 Gr WCB

A352 Gr LCB

A217 Gr WC6

A217 Gr WC9

01

Body

A216 Gr WCB

A352 Gr LCB

A217 Gr WC6

A217 Gr WC9


NO.

Part name

C5

LCB

WC6

WC9

10

Yoke stud&nut

A193 Gr B16/A194   Gr 4/7

A193 Gr B16/A194   Gr 4/7

A193 Gr B7/A194   Gr 2H

A193 Gr B7/A194   Gr 2H

09

Cover   stud&nut

A193 Gr B16/A194   Gr 4/7

A193 Gr B16/A194   Gr 4/7

A193 Gr B7/A194   Gr 2H

A193 Gr B7/A194   Gr 2H

08

Gasket

SS304

SS304

SS304

SS316

07

Thrust ring

A182 F5

A182 F22

A182 F304

A182 F316

06

Back up ring

A182 F5

A182 F22

A182 F304

A182 F316

05

Yoke

A217 Gr C5

A217 Gr C15

A351 Gr CF8

A351 Gr CF8M

004

Hinge

A217 Gr C5

A217 Gr C15

A351 Gr CF8

A351 Gr CF8M

03

Cover

A217 Gr C5

A217 Gr C15

A351 Gr CF8

A351 Gr CF8M

02

Bonnet

A217 Gr C5

A217 Gr C15

A351 Gr CF8

A351 Gr CF8M

01

Body

A216 Gr WCB

A217 Gr C15

A351 Gr CF8

A351 Gr CF8M


CLASS 600~2500 PRESSURE SEALING SWING CHECK VALVE

Dimensions

Class 600

Size

inch

2

2-1/2

3

4

5

6

8

10

12

14

16

18

20

L,L1

mm

292

330

355

431

508

558

660

787

838

889

991

1092

1194

L1-SP

mm

178

216

245

304

381

457

584

711

812

889

991

1092

1194

H

mm

240

265

275

325

370

425

500

555

610

725

755

850

925

WT.(approx)

Kg

20

38

45

45

95

125

220

330

505

595

800

1150

1600


Dimensions

Class 900

Size

inch

2

2-1/2

3

4

5

6

8

10

12

14

16

18

L,L1

mm

368

419

381

457

559

609

736

838

965

1029

1130

1219

L1-SP

mm

368

254

305

355

432

508

660

787

914

991

1092

1219

H

mm

250

580

290

335

380

440

510

570

620

730

790

860

WT.(approx)

Kg

44

57

75

105

140

230

440

590

870

1085

1225

1700


Dimensions

Class 1500

Size

inch

2

2-1/2

3

4

5

6

8

10

12

14

16

L,L1

mm

368

419

470

546

673

705

832

991

1130

1257

1384

L1-SP

mm

216

254

305

406

483

559

711

864

991

1067

1194

H

mm

265

295

310

345

385

460

515

590

645

765

800

WT.(approx)

Kg

65

72

80

125

160

300

525

960

1130

1450

2100


Dimensions

Class 2500

Size

inch

2

2-1/2

3

4

5

6

8

10

12

L,L1

mm

451

508

578

673

794

914

1022

1270

1422

L1-SP

mm

279

330

368

457

533

610

762

914

1014

H

mm

280

310

325

370

425

500

525

630

695

WT.(approx)

Kg

78

95

110

205

395

495

900

1300

1950


Gear operation suggested. Dimensions on request. Abbreviation: SP-Short pattern.


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