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Globe dark globe valves
Model: J41B
Nominal diameter: DN15 ~ DN300
Nominal pressure: PN16 ~ PN25
Medium: liquid, gas, ammonia, nitrogen, hydrogen,
Temperature: -10 ℃ -150 ℃
Body Material: Cast iron, cast steel
Operation: manual , gear drive, electric, pneumatic and other
Design and manufacturing: GB12235
Structural length: GB12221
Flange dimensions: GB9113 JB79
Pressure - temperature: GB9131
Test and Inspection: GB / T13927 JB / T9092

First, the structural characteristics and uses
 1, through the flange for the square structure, the stem rod connection. 
 2, the valve body sealing surface using ball convex shape, and the valve to line seal. 
 3, the sealing surface with Babbitt, sealing performance, long service life.
 

Globe dark globe valves often use oxygen, nitrogen, hydrogen, argon and other gases. These gases are generally stored in a dedicated high-pressure gas. When using the ammonia through the cut-off valve to gas pressure drop to the desired range of experiments, and then through the other control valve fine-tuning, the gas input system. The most commonly used pressure reducing valve for the ammonia valve, referred to as ammonia valve. 
 

Second, performance specifications

Nominal pressure PN (MPA)

Test pressure PS (MPa)

Suitable media

Applicable temperature (℃)

2.5

3.8

Ammonia, 
ammonia and other 
NH3

Babbitt alloy 
 -40 ℃ 
+ 150 ℃

PTFE 
-40 ℃ 
+200 ℃

4.0

6.4


Third, the main size and weight:

DN (mm)

Size (mm)

L

D

D1

D2

D4

b

f

f1

Z-φd

turn off

open

D3

10

130

90

60

40

35

16

2

4

4-φ14

165

185

110

15

130

95

65

45

40

16

2

4

4-φ14

165

185

110

20

150

105

75

55

51

18

2

4

4-φ14

170

200

120

25

160

115

85

65

58

18

2

4

4-φ14

197

210

120

32

180

135

100

78

66

20

2

4

4-φ18

199

213

140

40

200

145

110

85

76

20

3

4

4-φ18

248

264

160

50

230

160

125

100

88

22

3

4

4-φ18

265

295

180

65

290

180

145

120

110

24

3

4

8-φ18

310

349

220

80

310

195

160

135

121

26

3

4

8-φ18

340

357

240

100

350

230

190

160

150

30

3

4.5

8-φ23

380

413

280

125

400

270

220

188

176

32

3

4.5

8-φ25

430

451

320

150

480

300

250

218

204

32

3

4.5

8-φ25

505

492

360

200

600

360

310

278

260

34

3

4.5

12-φ25

550

806

400

250

650

425

370

335

31

36

3

4.5

12-φ30

730

880

450

300

750

485

430

390

364

40

3

4.5

16-φ30

-

995

550

 

Fourth, the appearance and working principle
 Ammonia valve high pressure chamber and the cylinder connection, low pressure chamber for gas exports, and access to the use of the system. Indication of high pressure gauge is the pressure of gas stored in the cylinder. Low pressure gauge outlet pressure can be controlled by adjusting screw. 
 Open the cylinder main switch when using, then turn the low pressure gauge pressure adjusting screw clockwise to compress the main spring and drive the diaphragm, spring pad and ejector to open the valve. Such imports of high-pressure gas from the high-pressure chamber after throttling decompression into the low-pressure chamber, and through the exit leading to the working system. Turn the adjusting screw to change the opening height of the valve to regulate the passage of high-pressure gas and achieve the desired pressure value. 
 Ammonia cut-off valves are equipped with safety valves. It is to protect the ammonia valve and make it safe to use the device, but also the ammonia valve failure signal device. If due to the valve pad, valve damage or for other reasons, resulting in the pressure on the outlet and rise above a certain allowable value, the safety valve will automatically open the exhaust.
 

Fifth, the use of
 (1) according to the different requirements of use, ammonia valve has many specifications. Most of the highest import pressure, the minimum import pressure of not less than 2.5 times the outlet pressure. Export pressure specifications more generally, the maximum outlet pressure. 　　
 (2) Ammonia valve should be installed to determine whether the connection specifications consistent with the use of the system connector. Ammonia globe valve with hemispherical connection, by tightening the nut so that the two completely match. Therefore, the use of the two hemispherical surfaces should be kept clean to ensure a good airtight effect. Use high-pressure gas to blow off the dust before installation. If necessary, PTFE and other materials can also be used for gaskets. 
 (3) ammonia valve should be prohibited from contact with grease, so as to avoid fire accidents. 
 (4) stop working, the relief valve should be more than air net, and then loosen the adjustment screw to prevent long-term compression of the elastic deformation. 
 (5) Ammonia stop valve should be avoided impact vibration, not with corrosive substances in contact.


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