Minimum design temperature
State design temperature, operating temperature and relevant pressure-temperature conditions. “Cryogenic” alone is not an adequate material or design requirement.
Bonnet and stem extension
The extension arrangement depends on insulation requirements, valve orientation and the need to keep stem packing away from cold zones. Dimensions must follow project drawings.
Seals and testing
Seat and stem seal materials must be suitable for the specified temperature and cycling duty. Define any required low-temperature testing and leakage requirements.
Materials and documents
Check pressure shell material, trim, bolting, seat and packing; obtain approved drawings and testing procedures before fabrication.
Frequently asked questions
Does a cryogenic ball valve always need a bonnet extension?
The requirement depends on the service temperature, installation, applicable standard and project design.
Is F316 automatically suitable for every cryogenic application?
No. Suitability depends on the complete component specification and required testing.
