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A47H Flange type spring micro open type safety valve

A47H Flange type spring micro open type safety valve

This valve is suitable for the work temperature are less than 350 of steam, air and other media of the equipment or pipeline, as the overpressure protection device. Connecting flange standard press JB/T-94 Series 1

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Product Description

This valve is suitable for the work temperature are less than 350 of steam, air and other media of the equipment or pipeline, as the overpressure protection device. Connecting flange standard press JB/T-94 Series 1



Main parts material

 

NO.

Part name

material

1

valve body

WCB

2

valve seat

ZG2Cr13

3

Adjusting ring

ZG2Cr13

4

disc

2Cr13

5

Guide sleeve

2Cr13

6

bonnet

ZG230-450

7

Spring

50CrVA

8

The stem

2Cr13

9

Wrench

ZG200-400

10

stretching screw

45

11

Protective cover

ZG200-400

Sealing surface material

"H" type surfacing D507, "Y" surfacing Co based hard alloy

Outline dimensions and connection dimensions

Model

Size

DN

do

D

K

g

g1

b

f

f1

Z-φd

DN'

D 1

k1

g2

g'

b1

f'

f1'

Z1- φd1

L

L1

H

A47H-16C

20

15

105

75

55

16

2

4-14

20

105

75

55

16

2

4-14

100

85

270

25

20

115

85

65

16

2

4-14

25

115

85

65

16

2

4-14

100

85

270

32

25

140

100

78

18

2

4-18

32

140

100

78

18

2

4-18

115

100

312

40

32

150

110

85

18

3

4-18

40

150

110

85

18

3

4-18

120

110

320

50

40

165

125

100

20

3

4-18

50

165

125

100

20

3

4-18

135

120

390

65

50

185

145

120

20

3

4-18

65

185

145

120

20

3

4-18

140

130

395

80

65

200

160

135

20

3

8-18

80

200

160

135

20

3

8-18

160

135

400

100

80

220

180

155

22

3

8-18

100

220

180

155

22

3

8-18

170

160

600

125

100

250

210

185

22

3

8-18

125

250

210

185

22

3

8-18

190

190

620

150

125

285

240

210

24

3

8-18

150

285

240

210

24

3

8-23

205

195

625

200

150

340

295

265

26

3

12-23

200

340

295

265

26

3

12-23

240

230

798

250

200

405

355

320

30

3

12-26

250

405

355

320

30

3

12-26

350

320

981

300

250

460

410

375

30

4

12-26

300

460

410

375

30

4

12-26

370

300

1005

A47H-25

20

15

105

75

55

16

2

4-14

20

105

75

55

16

2

4-14

100

85

270

25

20

115

85

65

16

2

4-14

25

115

85

65

16

2

4-14

100

85

270

32

25

140

100

78

18

2

4-18

32

140

100

78

18

2

4-18

115

100

312

40

32

150

110

85

18

3

4-18

40

150

110

85

18

3

4-18

120

110

320

50

40

165

125

100

20

3

4-18

50

165

125

100

20

3

4-18

135

120

390

65

50

185

145

120

22

3

8-18

65

185

145

120

20

3

4-18

140

130

395

80

65

200

160

135

24

3

8-18

80

200

160

135

20

3

8-18

160

135

400

100

80

230

190

160

24

3

8-23

100

220

180

155

20

3

8-18

170

160

600

125

100

270

220

188

28

3

8-26

125

250

210

185

22

3

8-18

190

190

620

150

125

300

250

218

30

3

8-26

150

285

240

210

24

3

8-23

205

195

625

200

150

360

310

278

34

3

12-26

200

340

295

265

26

3

12-23

240

230

798

250

200

425

370

332

36

3

12-30

250

405

355

320

30

3

12-26

350

320

981

300

250

485

430

390

40

4

16-30

300

Model

 A47H

Connection type

 Screw thread

 4

 Flange type

 structural style

 Closed and open type

 2

 Closed full swing

 7

 Non closed with handle micro Rev.

 8

 Not closed with handle full swing type

 Sealing surface material

 F

 PTFE

 Y

 D507

 H

 Cemented carbide

 Size

 DN

 DN15-DN500

 Opening pressure

 Mpa

 xx Mpa

 Material type

 1

 WCB

 2

 CF8

 3

 CF3

 4

 CF8M

 5

 CF3M

 Pressure

 PN10-PN100

 150LB-600LB

 5K-40K

The working principle of spring safety valve

When the pressing force of the steam pressure of safety valve under the flap over the spring, the top valve was opened. Open the top valve, exhaust steam due to the lower ring rebound effect of clamping ring in the valve, the valve opening quickly. Move with the valve, steam impingement in the adjusting ring and the exhaust tends to vertical downward direction, the exhaust steam to generate counterforce to push the valve to and within a certain pressure range enable valve maintained in enough altitude to enhance the safety valve open, steam is continuously discharged, the steam pressure in the system gradually reduce. At this time, will overcome the spring force acting on the valve on the steam pressure and exhaust of the reaction, thereby closing the safety valve.

The structure characteristics of spring safety valve

Spring safety valve from the valve and valve seat sealing surface, valve and valve stem connected to the stem of the total displacement of the valve must meet the requirements from the closed to the open. The setting pressure of the safety valve is adjusted by adjusting the bolt to change the spring pressure. The upper part of the valve is provided with a lever mechanism, which is used for manually lifting the valve stem in the action test. The valve body is provided with an upper and a lower two regulating rings, and the lower part of the regulating ring can be adjusted to obtain a complete take-off action of the valve, and the regulating ring is used to adjust the pressure of the back seat. Back seat pressure is too low, the valve remains open for a longer time; back seat pressure is too high, the valve will continue to take off and shut down, resulting in chatter, resulting in damage to the valve, but also reduce the valve discharge. The optimum position of the upper part of the adjusting ring should be able to make the valve reach full stroke.

Adjust the upper ring and the lower ring

To the right (counterclockwise) move the adjustment ring (guide sleeve), namely increasing regulation loop to reduce safety valve exhaust volume, improve the safety valve back seat pressure; moves to the left on the adjustment ring, that is, to reduce on the adjustment ring, thereby increasing the safety valve emissions, safety valve back seat pressure decreases. On the adjustment ring to adjust the position of the actual change of steam valve of the reaction. The adjustment ring down, then the steam valve to increase the reaction force of the safety valve is not easy to block, then this can reduce the back seat pressure. The adjustment ring must be adjusted with the adjusting ring (nozzle) of the minor adjustment, in order to make the operation of the safety valve is more reliable, sensitive and correct. To the right (counter clockwise) rotation of the adjusting ring, rising to compete the adjustment ring, the valve opens quickly and is very powerful, emissions while increasing the valve; turn left down link, reduce lower adjustment ring, reduce the discharge amount of steam. If the adjusting ring shift position too low, the valve will open and close in a continuous state