Dual Plate Check Valve

100% Bi-directional tight shut off at full rated pressure.

Figure Number AbbreviationSW-DCW Dual Plate Check - WAFER TypeSW-DCL Dual Plate Check - LUG TypeSW-DCF Dual Plate Check - FLANGE Type

Standard ComplianceThe face to face dimension shall be in accordance with API594, or otherSTANDARDS are available upon request.

Production RangeSIZE : DN 50 to DN 1800 (2 inch ~ 72 inch)Working Pressure : up to 25 barWorking Temperature : -20 ~ +160

Connection FlangeANSI B16.1 CL. 125LB & B16.5 CL. 150LB / MSS SP44 CL. 150LB /AS2129 Table D & E / BS4504 PN6, PN10 & PN16 / BS10 Table D & E / DIN2501 PN6, PN10 & PN16 /ISO 2531 PN6, PN10 & PN16 / KS/JIS 5K, 10K, 16K & 20K

Face to Face DimensionsConform to API 594

ApplicationChemical, petrochemical Power generaiton Mechanical engineering Mineral-oil industryTextile industry ShipbuildingHeating, air-conditioning, pipelinesWood-working, pulp and paper industryIron and steel industry, mining industryFoodstuff and allied industriesPublic utilities, municipal undertakings

35Dual Plate Check Valve

NO

1

2

3

4

5

6

7

8

9

Body

Disc

Seat

Spring

Hinge Pin

Stop Pin

Disc Bearings

Plugs

Eye Bolt

Stainless Steel (SS304 / SS316)

Stainless Steel (SS304 / SS316)

Stainless Steel (SS304 / SS316)

Teflon / Stainless Steel

Teflon / Stainless Steel

Steel (DN350 and larger)

Cast Iron / Ductile Iron / Carbon Steel /SS304/SS316/ Alu-Bronze

Ductile Iron / Carbon Steel / BronzeSS304 / SS316 / Alu-Bronze

Rubber (NBR / EPDM / SBR / Viton /Silicone / Neoprene)Stainless Steel

DESCRIPTION METERIAL

3

1 2 5 6

74

8

9

1011

Dual Plate Wafer Check ValveThe short face-to-face design makes dual plate check valves more compact and lighter, providing easy

installation and less expensive costs than conventional swing check valves.

This design is standard on all ANSI series 125lb through 2500lb valves.

316ss Springs and INCONEL X-750 springs are mostly used with other materials available to meet all

service conditions.

The torsion spring is designed to maximise reliability and minimise pressure loss and quickly colse the

check valve at zero flow to prevent slamming and water hammer commonly associated with many

types of other check valves.

PRODUCT GUIDE36

2”

2 1/2”

3”

4”

5”

6”

8”

10”

12”

14”

16”

18”

20”

24”

26”

28”

30”

32”

36”

40”

42”

48”

54”

60”

72”

50

65

80

100

125

150

200

250

300

350

400

450

500

600

650

700

750

800

900

1000

1050

1200

1350

1500

1800

60

73

89

114

141

168

219

273

324

356

406

457

508

610

660

711

762

813

914

1016

1067

1219

1372

1524

1829

2.4

2.9

3.5

4.5

5.6

6.6

8.6

10.7

12.8

14.0

16.0

18.0

20.0

24.0

26.0

28.0

30.0

32.0

36.0

40.0

42.0

48.0

54.0

60.0

72.0

60

67

73

73

86

98

127

146

181

184

191

203

219

222

222

305

305

356

368

419

432

524

540

660

914

2.4

2.6

2.9

2.9

3.4

3.9

5.0

5.7

7.1

7.2

7.5

8.0

8.6

8.7

8.7

12.0

12.0

14.0

14.5

16.5

17.0

20.3

21.3

26.0

36.0

60

67

73

73

86

98

127

146

181

222

232

264

292

318

318

318

368

368

483

483

568

629

629

650

650

2.4

2.6

2.9

2.9

3.4

3.9

5.0

5.7

7.1

8.7

9.1

10.4

11.5

12.5

12.5

12.5

14.5

14.5

19.0

19.0

22.4

24.8

24.8

25.6

25.6

60

67

73

79

105

136

165

213

229

273

305

362

368

438

438

438

505

505

635

635

701

701

701

750

750

2.4

2.6

2.9

3.1

4.1

5.4

6.5

8.4

9.0

10.7

12.0

14.3

14.5

17.2

17.2

17.2

19.9

19.9

25.0

25.0

27.6

27.6

27.6

29.5

29.5

105

124

137

175

197

222

279

340

410

451

514

549

606

718

773

832

883

940

1048

1162

1219

1384

1549

1715

2051

4.1

4.9

5.4

6.9

7.8

8.7

11.0

13.4

16.1

17.8

20.2

21.6

23.9

28.3

30.4

32.8

34.8

37.0

41.3

45.7

48.0

54.5

61.0

67.5

80.7

111

130

149

181

216

251

308

362

422

486

540

597

654

775

835

903

953

1006

1118

1115

1166

1274

1493

1645

-

4.4

5.1

5.9

7.1

8.5

9.9

12.1

14.3

16.6

19.1

21.3

23.5

25.7

30.5

32.9

35.6

37.5

39.6

44.0

43.9

45.9

50.2

58.8

64.8

-

111

130

149

194

241

267

321

400

457

492

565

613

683

791

867

915

968

1024

1130

1155

1220

1392

1556

1735

-

4.4

5.1

5.9

7.6

9.5

10.5

12.6

15.7

18.0

19.4

22.2

24.1

26.9

31.1

34.1

36.0

38.1

40.3

44.5

45.5

48.0

54.8

61.3

68.3

-

2.4

4.3

5.7

7.5

12

16

33

50

79

93

159

178

234

348

740

692

835

665

1197

1247

1405

1307

2895

3645

6375

mmmm in

inch

SIZE

VALVE DIMENSIONS

dL

150LB

mm in

Weight(kg)

150LB300LB

mm in

600LB

mm in

D

150LB

mm in

300LB

mm in

600LB

mm in

unit : mm

Specification and design are subject to change without notice

DCW Series Wafer Type Valves

37Dual Plate Check Valve

2"

2 1/2"

3"

4"

5"

6"

8"

10"

12"

14"

16"

18"

20"

24"

26"

28"

30"

32"

36"

40'

42"

48"

54"

60"

72"

50

65

80

100

125

150

200

250

300

350

400

450

500

600

650

700

750

800

900

1000

1050

1200

1350

1500

1800

60

73

89

114

141

168

219

273

324

356

406

457

508

610

660

711

762

813

914

1016

1067

1219

1372

1524

1829

2.4

2.9

3.5

4.5

5.6

6.6

8.6

10.7

12.8

14.0

16.0

18.0

20.0

24.0

26.0

28.0

30.0

32.0

36.0

40.0

42.0

48.0

54.0

60.0

72.0

60

67

73

73

86

98

127

146

181

184

191

203

219

222

222

305

305

356

368

419

432

524

540

660

914

2.4

2.6

2.9

2.9

3.4

3.9

5.0

5.7

7.1

7.2

7.5

8.0

8.6

8.7

8.7

12.0

12.0

14.0

14.5

16.5

17.0

20.6

21.3

26.0

36.0

60

67

73

73

86

98

127

146

181

222

232

264

292

318

318

318

368

368

483

483

568

629

629

650

650

2.4

2.6

2.9

2.9

3.4

3.9

5.0

5.7

7.1

8.7

9.1

10.4

11.5

12.5

12.5

12.5

14.5

14.5

19.0

19.0

22.4

24.8

24.8

25.6

25.6

60

67

73

79

105

136

165

213

229

273

305

362

368

438

438

438

505

505

635

635

701

701

701

750

750

2.4

2.6

2.9

3.1

4.1

5.4

6.5

8.4

9.0

10.7

12.0

14.3

14.5

17.2

17.2

17.2

19.9

19.9

25.0

25.0

27.6

27.6

27.6

29.5

29.5

165

191

210

229

254

279

343

406

483

533

597

635

699

813

870

927

984

1060

1168

1289

1346

1511

1683

1854

2197

6.5

7.5

8.3

9.0

10.0

11.0

13.5

16.0

19.0

21.0

23.5

25.0

27.5

32.0

34.3

36.5

38.7

41.7

46.0

50.7

53.0

59.5

66.3

73.0

86.5

165

191

210

254

279

318

381

445

521

584

648

711

775

914

972

1035

1092

1149

1270

1238

1289

1416

1657

1810

-

6.5

7.5

8.3

10.0

11.0

12.5

15.0

17.5

20.5

23.0

25.5

28.0

30.5

36.0

38.3

40.7

43.0

45.2

50.0

48.7

50.7

55.7

65.2

71.3

-

165

191

210

273

330

356

419

508

559

603

686

743

813

940

1016

1073

1130

1194

1314

1320

1403

1500

1778

1994

-

6.5

7.5

8.3

10.7

13.0

14.0

16.5

20.0

22.0

23.7

27.0

29.3

32.0

37.0

40.0

42.2

44.5

47.0

51.7

52.0

55.2

59.5

70.0

78.5

-

7.4

7.4

8.4

13.5

16

22

44

86

100

127

162

190

254

403

482

543

696

855

1220

1410

1560

1770

1865

2110

2435

mmmm in

inch

SIZE

VALVE DIMENSIONS

dL

150LB

mm in

Weight(kg)

150LB300LB

mm in

600LB

mm in

D

150LB

mm in

300LB

mm in

600LB

mm in

unit : mm

Specification and design are subject to change without notice

DCF Series Flange Type Valves

Engineerring Data

Installation

The Minimum Flow Velocity, V(min) to be opened in full flow conditon(when the discs are to be stable position) iscalculated as following equation.

The Check valve is designed for steady flow condition and can be installed in horizontal and vertical pipelined butthe instructions shown must be adhered to.

Where,KT = Applicable Spring Torsional Coefficiency, Kgf/mm,Wd = Disc Weight, kgfL = Spring Arm Rest total length, mmD = Nominal Valve Size, DN(mm)

2"

2.5"

3"

4"

5"

6"

8"

10"

12"

14"

16"

18"

20"

24"

DN50

DN65

DN80

DN100

DN120

DN150

DN200

DN250

DN300

DN350

DN400

DN450

DN500

DN600

48

86

128

278

430

680

1370

2360

3760

5080

7430

10100

12900

24100

1.2

1.2

1.2

1.2

0.9

0.9

0.9

0.8

0.8

0.8

0.8

0.6

0.6

0.6

0.28

0.28

0.25

0.20

0.20

0.18

0.12

0.10

0.10

0.10

0.08

0.08

0.08

0.08

V (min) = 60 m/secLD2 10-

8(KT + Wd)

Cv-valve Capacity, ANSI 150#/300#

Valve Size CvMin. Flow Velocity

V(min), M/secMax. Pressure Drops

at V(min), bar

Min. Flow Velocity & Pressure Drops @ V(min)

Note. The valve must not be installed in pipelines with pulsating flow or near toreciprocating pumps.Additional pressure drop can be expected due to the weight of the discs

Installation in a horizontal pipeline Installation in a vetical pipeline

PRODUCT GUIDE38

Our company endeavor ceaselessly to develop new products and forquality improvement.

Specification Of Actuators

Electric actuator

Spur Gear

Cylinder actuator Drop-weight actuatorwith oil cylinder

Worm gear typewith actuator

flange

Worm gear direct type

Butterfly Valves

Chain wheel Square cap Handwheel Bevel gear Cylinder actuator

CCEERRTTIIFFIICCAATTEE

Factory & Office#721-2, Najeon-Ri, Saengnim-Myeon,Gimhae-Si, Gyeongsangnam-Do, KoreaTel : (055)323-6780~1, Fax : (055)323-6801Website : www.swvalves.co.krE-mail : swvalves@swvalves.co.krSpecification and design are subject to change without notice