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- Oxygen butterfly valve
- Lug API butterfly valve
- Brass butterfly valve
- High pressure butterfly valve
- High pressure gate valve (bevel gear)
- High pressure gate valves
- High pressure globe valve
- High temperature resistant butterfly valve
- API gate valve
- API check valve
- API globe valve
- Hard seal ball valve
- Wear-resistant ball valve
- Discharge valve
- Low temperature gate valve
- Low temperature ball valve
- Bellows valve
- Insulated gate valve
- Insulated ball valve
- Insulated globe valve
- Forged steel high pressure ball valve
- Orbital ball valve
- V-type regulating ball valve
- Regulating valve
- Safety valve
- All metal sealed bidirectional pressure butterfly valve
Low temperature ball valve
Low temperature ball valve is mainly suitable for ethylene, liquefied natural gas and other chemical devices, the output of liquid low-temperature medium such as ethylene, liquid oxygen, liquid hydrogen, etc. This kind of medium is not only inflammable and explosive, but also needs to be gasified when the temperature rises. Gasification is hundreds of times of volume expansion.
1. The material of pressure bearing parts can withstand the expansion, contraction and sealing structure caused by the change of medium temperature, and the structure of sealing parts will not produce permanent deformation when the temperature changes. When the valve is used under - 100'c, cryogenic treatment should be carried out for valve parts before finishing. That is, the parts are immersed in liquid ammonia tank for cooling. When the temperature of parts reaches - 192 ℃, the valve parts will be kept for 1-2 h. then the outside of the box will be taken out for natural treatment to normal temperature, and then the valve parts will be reheated and cycled twice
2. The valve cover adopts a long stiffened structure. Its purpose is to protect the function of the stuffing box, so that the stuffing box is far away from the low temperature and ensure the sealing effect of the packing. At the same time, the cold insulation material can be wound to prevent the loss of cold energy. The neck length of the long neck can be selected according to the use temperature and the thickness of the Baoling material. When the packing sealing effect decreases, grease can be added from the middle of the stuffing box to form an oil seal layer, which can reduce the differential pressure of the stuffing box and improve the sealing performance.
3. When the temperature is low-100'c, the stem material is treated by chromium plating or chlorination, which can improve the surface hardness of the valve stem and improve the reliability of the packing seal.
4. Low temperature ball valve has the structure of preventing abnormal pressure rise. Since the volume of cryogenic valve expands rapidly after medium gasification, the pressure will rise abnormally. When the pressure of valve Zhongsheng rises, the valve will connect with the inlet, or install a pressure relief valve at the inlet end of the valve to ensure the safe use of the valve.
5. The gasket used for low temperature ball valve has reliable sealing and recovery under normal temperature, low temperature state and temperature change.
Design specification: GB/T12237
Structure length: GB/T12221
Connection flange: GB/T9113
Test and inspection: JB/T9092, GB/T13927
Pressure-temperature: GB/T12224
Nominal diameter: DN15~250mm
Nominal pressure: PN1.6mpa
Applicable temperature: -& LT;
45 ℃ ~ 196 ℃
Main materials: LCB, CF8
Suitable medium: methane, liquid natural gas, ethylene, carbon dioxide, liquid ammonia, liquid oxygen, liquid fluorine, liquid hydrogen and other low-temperature medium
|
Product model
|
DN(mm) |
L |
D |
D1 |
D2 |
b |
Z-Φd |
H |
W |
WT (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 |
|
|
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 |
|
|
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 |
|
|
250 |
533 |
405 |
355 |
320 |
30 |
12-Φ25 |
790 |
1300 |
140 |
◆Main connection dimensions PN1.6MPa
|
Product model
|
DN(mm) |
L |
D |
D1 |
D2 |
b |
Z-Φd |
H |
W |
WT (kg) |
|
DQ41F-25 |
15 |
140 |
95 |
65 |
45 |
16 |
4-Φ14 |
178 |
140 |
3 |
|
20 |
152 |
105 |
75 |
55 |
16 |
4-Φ14 |
184 |
160 |
4 |
|
|
25 |
165 |
115 |
85 |
65 |
16 |
4-Φ14 |
195 |
180 |
6 |
|
|
32 |
178 |
135 |
100 |
78 |
18 |
4-Φ18 |
280 |
250 |
10 |
|
|
40 |
190 |
145 |
110 |
85 |
18 |
4-Φ18 |
280 |
300 |
14 |
|
|
50 |
216 |
160 |
125 |
100 |
20 |
4-Φ18 |
300 |
350 |
20 |
|
|
65 |
241 |
180 |
145 |
120 |
22 |
8-Φ18 |
330 |
350 |
25 |
|
|
80 |
283 |
195 |
160 |
135 |
22 |
8-Φ18 |
360 |
400 |
30 |
|
|
100 |
305 |
230 |
190 |
160 |
24 |
8-Φ23 |
400 |
500 |
40 |
|
|
125 |
381 |
270 |
220 |
188 |
28 |
8-Φ25 |
430_ |
600 |
65 |
|
|
150 |
403 |
300 |
250 |
218 |
30 |
8-Φ25 |
500 |
800 |
85 |
|
|
200 |
502 |
360 |
310 |
278 |
34 |
12Φ25 |
680 |
800 |
100 |
|
|
250 |
568 |
425 |
370 |
332 |
36 |
12-Φ30 |
790 |
300 |
165 |
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