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Vacuum cut off valve

Products > Power station valve > Vacuum cut off valve

Vacuum cut off valve

Model: NKZ44H-10C
Nominal diameter: DN50 ~ 800mm
Nominal pressure: PN1.0 ~ 35.0Mpa, 150Lb-3500Lb
Operating temperature: -40-600 ℃
Connection: flange, thread, butt welding, socket welding, NPT
Main material quality: PTFE, PVC, ABS, RPP, 304,316,304L, 316L, SS316, WCB, CF3, CF8, CF3M, CF8M, cast steel, cast iron, forged steel, stainless steel, copper, etc.
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First, the product overview: 

This series of valve connection sub-flange, welding two kinds of driving methods are manual, electric two. The valve is suitable for working temperature ≤ 425 ℃ and ≤ 550 ℃, the working medium is water, steam or air pipe, as the opening and closing device; especially suitable for thermal power plant condensing and vacuum vacuum system, vacuum isolation seal.
 

Second, the structural features:

 1, designed a vacuum sealed packing room, the system isolated from the atmosphere, with good environmental performance. 
 2, selection of sophisticated materials, all relevant standards at home and abroad, the overall high-quality materials. 
 3, advanced and reasonable pairing pair, improve the sealing performance, long service life. 
 4, the opening and closing pieces of parallel gate with two-way flexible seal, small friction, easy opening and closing, easy maintenance, reliable sealing, excellent performance. 
 5, the stem by quenching and nitriding surface treatment, good corrosion resistance, scratch resistance and wear resistance. 
 6, flange gasket composite materials, expansion coefficient, airtight, and ensure the system and the atmosphere isolated and reliable.

 

Third, the test pressure:

Nominal pressure 
       PN / MPa

Test pressure / MPa

Shell strength test

Seal test

Seal test

1.0

1.5

1.1

1.1

1.6

2.4

1.8

1.8

2.5

3.8

2.8

2.8

4.0

6.0

4.4

4.4

6.4

8.6

7.0

7.0

10.0

15.0

11.0

11.0

 

Fourth, the scope of application:

product type

Suitable media

Applicable temperature / ℃

NKZ41H 
       NKZ44H 
       NKZ944H-C type 
       NKZ941H

Water, steam, air

≤425

NKZ41H (Y) 
       NKZ44H (Y) -I type 
       NKZ944H (Y) -I type 
       NKZ941H (Y)

Water, steam, air

≤550

 

Fifth, the main components and parts:

Part Name

Body, bonnet

Valve stem

gate

Sealing surface

Stem nut

filler

fastener

NKZ44H 
       NKZ41H-C type 
       NKZ944H-C type 
       NKZ941H

WCB

2Crl3

25

H: Alloy steel

Aluminum bronze

Expanded composite graphite

High-quality carbon steel

NKZ44 
       NKZ41Y-I type 
       NKZ944-I type 
       NKZ941

Chrome-molybdenum steel

20CrlMo1VA 
       38CrMoAlA

Chrome-molybdenum steel

Y: Carbide

Chrome-molybdenum steel

 

Six , size and weight:

DN / mm

PN / MPa

The main dimensions and connection dimensions / mm

Valve 
       weight 
       / kg

Attached flange size / mm

L

H

D

D1

D2

b

f

zd

W

h

D0

Dn

50

1.0

250

345

160

125

100

16

3

4-18

250

28

45

49

58

65

270

395

180

145

120

18

3

4-18

250

40

48

64

75

80

280

425

195

160

135

20

3

4-18

300

55

50

78

97

100

300

510

215

180

155

20

3

8-18

300

72

52

96

110

125

325

570

245

210

185

22

3

8-18

350

106

60

120

136

150

350

725

280

240

210

24

3

8-18

350

146

60

145

163

200

400

820

335

295

265

26

3

8-18

400

220

62

202

223

250

450

890

390

350

320

28

3

12-23

400

315

62

225

278

300

500

1070

440

400

368

28

3

12-23

450

398

65

303

330

350

550

1320

500

460

428

30

4

16-23

550

530

65

351

382

400

600

1450

565

515

482

32

4

16-25

550

690

65

398

432

450

650

1560

615

565

532

32

4

20-25

600

870

70

460

485

500

700

1720

670

620

585

34

4

20-25

650

1080

78

500

535

600

800

1880

780

725

685

36

5

20-30

700

1350

90

600

636

700

900

2085

895

840

800

40

5

24-30

750

1950

90

690

726

800

1000

2590

1010

950

905

44

5

24-34

800

2500

106

790

826

50

1.6

250

345

160

125

100

16

3

4-18

250

28

48

49

58

65

270

395

180

145

120

18

3

4-18

250

40

50

64

75

80

280

425

195

160

135

20

3

8-18

300

58

52

78

91

100

300

510

215

180

155

20

3

8-18

300

75

52

96

110

125

325

570

245

210

185

22

3

8-18

350

110

60

120

136

150

350

725

280

240

210

24

3

8-23

350

150

60

145

163

200

400

820

335

295

265

26

3

12-23

400

223

62

201

223

250

450

890

405

355

320

30

3

12-25

450

326

68

253

278

300

500

1070

460

410

375

30

3

12-25

550

432

70

303

330

350

550

1320

520

470

435

34

4

16-25

600

572

78

351

382

400

600

1450

580

525

485

36

4

16-30

650

740

90

398

432

450

650

1560

640

585

545

40

4

20-30

700

955

95

450

485

500

700

1720

705

650

608

44

4

20-34

750

1195

98

500

535

600

800

1880

840

770

718

48

5

20-41

800

1455

105

600

636

700

900

2085

g10

840

788

50

5

24-41

850

2110

110

690

726

800

1000

2590

1020

950

898

52

5

24-41

950

2630

115

790

826

DN / mm

PN / MPa

The main dimensions and connection dimensions / mm

Valve 
       weight 
       / kg

Attached flange size / mm

L

H

D

D1

D2

b

f

Zd

W

h

D0

Dn

50

2.5

250

345

160

125

100

20

3

4-18

250

30

48

49

64

65

270

395

180

145

120

22

3

8-18

250

43

52

66

82

80

280

425

195

160

135

22

3

8-18

300

60

55

78

95

100

300

510

230

190

160

24

3

8-23

300

79

62

100

117

125

325

570

270

220

188

28

3

8-25

350

114

68

125

144

150

350

725

300

250

218

30

3

8-25

350

157

72

151

172

200

400

820

360

310

278

34

3

12-25

400

243

60

201

223

250

450

890

425

370

332

36

3

12-30

450

345

85

253

278

300

500

1070

483

430

390

40

4

16-30

550

455

92

303

330

350

550

1320

550

4g0

448

44

4

16-34

650

615

98

351

382

400

 

1450

610

550

505

48

4

16-34

700

7g4

115

398

432

450

650

1560

660

600

555

50

4

20-34

750

1018

115

450

483

500

700

1720

730

660

610

52

4

20-41

800

1250

120

498

535

600

800

1880

840

770

718

56

5

20-41

850

1528

130

598

636

700

900

2085

955

875

815

60

5

24-48

900

2265

140

688

726

800

1000

2590

1070

990

930

64

5

24-48

1000

2847

150

788

826


DN / mm

PN / MPa

The main dimensions and connection dimensions / mm

Valve 
       weight 
       / kgt

Attached flange size / mm

L

H

D

D1

D2

b

f

D6

f2

zd

W

h

D0

Dn

50

4.0

250

345

160

125

100

20

3

88

4

4-18

300

35

48

48

64

65

270

395

180

145

120

22

3

110

4

8-18

300

49

52

66

82

80

280

425

195

160

135

22

3

121

4

8-18

350

65

58

78

95

100

300

510

230

190

160

24

3

150

4.5

8-23

350

87

68

100

117

125

325

570

270

220

188

28

3

176

4.5

8-25

400,

124

68

125

144

150

350

725

300

250

218

30

3

204

4.5

8-25

400

172

72

151

172

200

400

820

375

320

282

38

3

260

4.5

12-30

450

275

88

19g

223

250

450

890

445

385

345

42

3

313

4.5

12-34

550

392

102

251

278

300

500

1070

510

450

408

46

4

364

4.5

16-34

650

515

116

301

330

350

550

1320

570

510

465

52

4

422

5

16-34

750

684

120

34g

382

400

600

1450

655

585

535

58

4

474

5

16-41

850

902

142

396

432