A well-established German manufacturer of flame arresters and tank relief valves approached us with the request to design and build a test unit for testing their pilot operated valves in Cryogenic conditions.
The reason for the test is recently introduced ISO 21013-4. This standard specifies the requirements for the design, manufacture and testing of pilot operated pressure relief valves for cryogenic service (-150 to ‑196 °C / -238 to -321 °F), i.e. for operation with cryogenic fluids in addition to operation at temperatures from ambient to cryogenic.