BY TEMPERATURE CLASS
Cryogenic Valves
Temperature bands used to start a shortlist. Seat, packing and body material still have to be written into the RFQ.
Choosing Cryogenic Valves
Cryogenic selection depends on the actual cold fluid and operating temperature, including cooldown and warmup. An extended bonnet, suitable materials, seat design and cavity-pressure management may be relevant, but each must be confirmed for the specific valve.
What to include in the RFQ
- Provide minimum/normal temperatures, pressure, fluid and thermal cycles.
- Request cold-service rating, leak testing and permitted installation orientation.
- For cavity-forming designs, review trapped-liquid relief and flow direction.
Selection scenario
For a cold-liquid isolation point, include shutdown and warmup conditions in the RFQ. Ask how the offered design handles liquid trapped within the assembly.
Common selection mismatch
An extension between body and handle is not by itself proof of a cryogenic bonnet or cold-service qualification.