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Cryogenic Ball Valve

Cryogenic Ball Valve


Description of Cryogenic Ball Valve:

ZECO cryogenic ball valve can be designed floating ball and trunnion mounted ball type. To prevent abnormal rising pressure in the valve body cavity, at upstream side the ball will be made a hole to connect body cavity between the upstream pipeline and balance pressure, So at installing need to consider the medium flow direction. The valve seat structure is used DBB type, that can self-relieving pressure into the upstream or downstream pipeline when the body cavity pressure abnormal rising. Between body and seat the seal type is designed to double Lip-seal or with reversed-load double Lip-seal. Between stem and packing is used Lip-seal + graphite type. The valve packing will be loaded belleville spring in order to prevent looseness. The valve bonnet is designed extented-bonnet type. To different service temperature in order to keep packing seat temperature above 0℃.


Features of Cryogenic Ball Valve:

1. ZECO cryogenic ball valve pressure parts because after cryogenic treatment before machining, in liquid nitrogen tank - 196 ℃ repeat twice last insulation 1 ~ 2 hours, so ZECO ball valve parts won't because of the change of the medium temperature caused by heat bilges cold shrink, sealing structure will not cause deformation because of the low temperature;

2. In order to protect the long-term sealing effect of the packing box, the cover of the ZECO cryogenic ball valve adopts the long-neck structure to keep the packing box away from low temperature and add insulation material on it;

3. The special developed gasket of ZECO cryogenic ball valve can ensure the normal operation at low temperature and normal temperature;

4. The stem of ZECO cryogenic ball valve is also chrome plated and nitride treated, greatly improving the surface hardness of the stem.


Material of Cryogenic Ball Valve:

No

Part

Material

1

Body

ASTM A350 LF2

2

Bonnet

ASTM A350 LF2

3

Ball

ASTM A350 LF2

4

Seat

ASTM A182 F316 + TFM

5

Stem

17-4PH

6

Anti-static Device

SS316

7

Gasket

Graphite + SS316

8

Bolt

ASTM A193 B8

9

Nut

ASTM A194 8

10

O-ring

Viton A

11

Lever

ASTM A216 WCB


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