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Cryogenic ball valve
Model: DQ41F
Nominal diameter: DN15 ~ 500mm
Nominal pressure: PN1.6 ~ 10.0MPa
Medium: water, oil, steam, acid: Medium
Temperature: -196-29 ℃
Main material: LCB, CF8
Driving mode : manual, electric, pneumatic
Design criteria: ASME B16.34 GB / T12224
Structural length: ASME B16.10 GB / T12221
Connection flange: ASME B16.34 JB / T79
Test and inspection: JB / T9092 API 598
Product details

Product working principle and purpose:

Series low-temperature ball valve is mainly used in ethylene, liquefied natural gas and other chemical devices, the output of low-temperature liquid medium such as ethylene, liquid oxygen, liquid hydrogen. Such media is not only flammable and explosive, but also in the heating gasification, gasification volume expansion hundreds of times. And these media penetration, easy to leak, processing more difficult.
Product Structure Features:

1. Pressure parts of the material can withstand the temperature changes caused by the medium expansion, shrinkage, the structure of the sealing part of the temperature changes will not produce permanent deformation. For the following conditions -100 ℃, the valve parts should be cryogenic treatment before finishing, the parts will be immersed in a liquid nitrogen tank for cooling, when the temperature reaches -192 ℃ parts, start holding 1-2h, and then removed Natural treatment to the room temperature, review cycle 2 times.

2, the valve cover with long structure, its purpose to protect the function of stuffing box, the stuffing box at a farther position from the low temperature to ensure the sealing effect of packing, but also can be wound cold insulation material to prevent loss of cold energy. Long neck neck length according to the use of temperature and cold insulation material to choose a different length. When the packing sealing effect is reduced, you can add the grease from the middle of the packing box to form the oil seal layer, reducing the pressure difference of the packing box and improving the sealing performance.

3, the use of temperature below -100 ℃, the stem material after chrome or nitriding, improve the stem surface hardness and improve the reliability of packing seal.

4, the low temperature ball valve to prevent abnormal pressure structure, due to the low temperature valve gasification, the rapid expansion of its volume, the pressure will rise abnormally, when the valve cavity pressure rises, the valve cavity and import connectivity, or the valve inlet Pressure relief valve placed at the end to ensure the safe use of the valve.

5, low temperature ball valve gasket with at room temperature, low temperature conditions and temperature changes can be reliable sealing and recovery.
 

Product performance parameters:

Test pressure (MPa)

Nominal pressure (MPa)

Pressure class

JIS (K)

1.6

2.5

4.0

6.4

10.0

150

300

600

10K

20K

Strength test

2.4

3.75

6.0

9.6

15.0

3.0

7.5

16.5

2.4

3.8

Seal test

1.76

2.75

4.4

7.04

11.0

2.2

5.5

12.1

1.5

2.8

Airtight test

0.4 ~ 0.7MPa


 The main parts of the product material:

Product number

DQ41F-10C-100

DQ41F-10P-100P

DQ47F-10C-100

DQ47F-10P-100P

Body

LCB

CF8

Sphere

304

304

Valve stem

304

304

Sealing ring

PTFE

PTFE

filler

PTFE + O-ring

PTFE + O-ring

Suitable media

Water, oil, steam and so on

Acid and other corrosive media

proper temperature

-50 ~ 29 ℃

-196 ~ 29 ℃

 
 Product main dimensions:

Product number

Nominal diameter

PN1.6-2.5MPa

WT

DN

L

D

D1

D2

b

Z-Φd

H

W

(kg)

DQ41F-16C

15

130

95

65

45

14

4-Φ14

178

140

3

20

140

105

75

55

14

4-Φ14

184

160

4

25

150

115

85

65

14

4-Φ14

195

180

5

DQ41F-16P

32

165

135

100

78

16

4-Φ18

280

250

9

40

180

145

110

85

16

4-Φ18

280

300

11

50

203

160

125

100

16

4-Φ18

300

350

15

65

222

180

145

120

18

4-Φ18

330

350

19

80

241

195

160

135

20

8-Φ18

360

400

27

DQ9B41F-16C

100

305

215

180

155

20

8-Φ18

400

500

38

125

356

245

210

185

22

8-Φ18

430

600

58

150

394

280

240

210

24

8-Φ23

500

800

81

200

457

335

295

265

26

12-Φ23

680

800

95

DQ9B41F-16P

250

533

405

355

320

30

12-Φ25

790

1300

140