There are two types of bonnet designs for Cryogenic Gate Valve. One is Bolted Bonnet.The other is Welded Bonnet.
1. Valve Size : 2-1/2” ~ 24”
2. Applicable Rating : ASME 150# ~ 1500#
3. Temperature : Down to -196 ℃
4. Code & Standard : BS, ASME, ASTM
Designed by BS6364, ASME B16.34, and ASME B16.25/16.5
5. Shell & Seat Leak Test : API 598 & BS6364
6. Constructions：
End Connection : Flanged, Butt-Welded or RTJ Type
Long Extended Bonnet
Operator : Gear-operated Type
Pressure Relief Design(Pressure Balance Design)
Fire Safety / Anti-static Design
Uni- / Bi-Directional
1.In order to prevent abnormal pressure rise in the middle cavity, a pressure relief hole is set on the inlet side of the ram.
2.Determine the top length of the bonnet according to the working temperature of the valve to ensure reliable sealing of the stem packing
3.Reasonable selection of materials for packing, gaskets and other parts according to the working temperature.
4.Cryogenic Gate Valve strictly controls the chemical composition of the material and the mechanical performance indicators such as cryogenic temperature impact toughness.
5.Cryogenic Gate Valve adopts a variety of piping flange standards and sealing surface types, suitable for various engineering needs.
| PARTS NAME | MATERIAL |
| BODY | Cast Steel- ASTM A351-CF8(M)/CF3(M) |
| BONNET | Cast Steel- ASTM A351-CF8(M)/CF3(M) |
| SEAT | SOFT SEAT : PCTFEMETAL SEAT : ASTM A276-304L(H.F) |
| WEDGE | ASTM A276-304(L)(H.F) / 316(L)(H.F) or Equivalent |
| STEM | ASTM A276-316(L) |
| GASKET | SPIRAL WOUND GRAPHITE |
| GLAND PACKING | GRAPHITE |
All metal parts are subjected to more than two deep cold treatments before finishing;
All extended valve stems (except check valves) are made of high-performance XM-19 or Inconel718 alloy materials;
All spheres are hardened and precision ground, with a surface accuracy of more than 0.2um;
All lip-seal seals are from international first-line brands;
All sealing surfaces that match the lip-seal are polished with precision technology to achieve a surface accuracy of more than 0.2um;
All "TEJI" brand cryogenic valves are tested for normal temperature and low temperature performance according to international industry standards before leaving the factory, and are shipped only after they pass the test;
All seals of the extended stem packing parts adopt a unique combined structure, which can not only ensure long-term sealing performance, but also reduce the switching torque;
All valves below -101℃ (except check valves) are equipped with cooling plates to effectively ensure that the temperature at the bottom of the packing is above 0℃; at the same time, it can effectively prevent condensed water from freezing on the valve body.
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