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Vacuum isolation shut-off valve

Vacuum isolation shut-off valve

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Globe Valve
Describe
Product Usage
Vacuum isolation stop valve This valve is suitable for working temperature ≤ 425 ° C and ≤ 550 ° C, the working medium is water, steam or air, as an opening and closing device; especially suitable for steam turbine condensation and vacuum negative pressure system in thermal power plants, vacuum Isolation and sealing.
 
Features
 
1. The main body of this series of valves adopts cast-forged structure, with parallel double-sealed semi-forced two-way seal, sealing surface in-position movement and block wedge-tight motion step-by-step to achieve zero leakage.
 
2. The sealing surface has small frictional force, light opening and closing, and the automatic wear compensation function of the sealing surface.
 
3. Simple and compact structure, convenient maintenance and long service life.
 
4. The bonnet vacuum sealing structure has self-expanding and compacting function, and the sealing is sealed by high-strength expansion material, so that the system is completely isolated from the atmosphere and has a good system airtightness.
 
5. This series of valve connection forms are divided into flange and welding. The driving methods are manual and electric.
 
The valve is suitable for working temperature ≤ 425 ° C and ≤ 550 ° C, the working medium is water, steam or air, as the opening and closing device; especially suitable for the steam condensing and vacuum negative pressure system of the thermal power plant, and the vacuum isolation and sealing function.
 
Performance parameter
 

product type

Shell strength test

Upper seal test

Seal test

Applicable medium

Applicable temperature / °C

NKJ61H-40

6

4.4

4.4

Water, steam, air

≤425

NKJ61H-64

9.6

7

7

NKJ61H-100

15

11

11

NKJ61H-40I

6

4.4

4.4

Water, steam, air

≤550

NKJ61H-64I

9.6

7

7

NKJ61H-100I

15

11

11

Product parts and materials

Part Name

Valve body, bonnet

Valve stem

Valve flap

Sealing surface

Stem nut

filler

fastener

NKJ61H-C

25、WCB

Chrome stainless steel

Chrome stainless steel

H:alloy steel

Aluminum bronze

Expanded composite graphite

High quality carbon steel

NKJ61H-I

Chrome-molybdenum steel

20Cr1Mo1VA或38CrMoA1A

12Cr1Mo1VA

Y:Cemented carbide

Chrome-molybdenum steel

 

Nominal diameter

Main dimensions and connection dimensions

L

D

D1

D2

b

Z-d

H

D0

NKJ41H-16C

15

130

95

65

45

14-2

4-Φ14

170

120

20

150

105

75

55

14-2

4-Φ14

190

140

25

160

115

85

65

14-2

4-Φ14

205

160

32

180

135

100

78

16-2

4-Φ18

270

180

40

200

145

110

85

16-3

4-Φ18

310

200

50

230

160

125

100

16-3

4-Φ18

358

240

65

290

180

145

120

18-3

4-Φ18

373

240

80

310

195

160

135

20-3

8-Φ18

435

280

100

350

215

180

155

20-3

8-Φ18

500

300

125

400

245

210

185

22-3

8-Φ18

614

320

150

480

280

240

210

24-3

8-Φ23

674

360

200

600

335

295

265

26-3

12-Φ23

811

400

250

650

405

355

320

30-3

12-Φ25

969

450

300

750

460

410

375

30-3

12-Φ25

1145

580

350

850

520

470

435

34-4

16-Φ25

1280

640

400

980

580

525

485

36-4

16-Φ30

1452

640

NKJ41H-25C

15

130

95

65

45

16-2

4-Φ14

170

120

20

150

105

75

55

16-2

4-Φ14

190

140

25

160

115

85

65

16-2

4-Φ14

205

160

32

180

135

100

78

18-2

4-Φ18

270

180

40

200

145

110

85

18-3

4-Φ18

310

200

50

230

160

125

100

20-3

4-Φ18

358

240

65

290

180

145

120

22-3

8-Φ18

373

240

80

310

195

160

135

22-3

8-Φ18

435

280

100

350

230

190

160

24-3

8-Φ23

500

300

125

400

270

220

188

28-3

8-Φ25

614

320

150

480

300

250

218

30-3

8-Φ25

674

360

200

600

360

310

278

34-3

12-Φ25

811

400

250

650

425

370

332

36-3

12-Φ30

969

450

300

750

485

430

390

40-4

16-Φ30

1145

580

350

850

550

490

448

44-4

16-Φ34

1280

640

400

980

610

550

505

48-4

16-Φ34

1452

640