Cryogenic Control Valve RFQ Checklist

Prepare a cryogenic control valve RFQ covering fluid, minimum temperature, flow, bonnet extension, installation and low-temperature testing.

11/9/20261 min read

Two cryogenic control valves can share the same line size and pressure class but require different trim, bonnet and testing arrangements. Give suppliers enough operating and installation data to quote the same duty.

DEFINE THE FLUID AND THE FULL OPERATING RANGE

Name the process fluid and its phase, identify the minimum design temperature and list pressure and flow for minimum, normal and maximum conditions. Flag startup, cooldown and any possibility of two-phase flow. If the valve handles a cryogenic liquid, provide enough data for a flashing or cavitation review where applicable. State connection type, line size and required shutoff differential.

SHARE THE INSTALLATION ENVELOPE

Specify the allowable stem orientation, insulation thickness, cold-box details if applicable, and available clearance for actuator and maintenance access. An extended bonnet helps keep stem packing away from the coldest region. Its suitability depends on the valve design and installation. Ask the supplier to show the extension and insulation interface on the general arrangement drawing.

SEPARATE OPERATING TEMPERATURE FROM TEST TEMPERATURE

State which ambient and cryogenic tests are required and give the applicable standards or project procedures, acceptance criteria and witness points. Ask the supplier to identify the test temperature, test medium and the parts of the assembly covered by the test. Include documentation and any material-traceability or cleanliness requirements specific to the service.

Send your cryogenic service datasheet to Zhongyue Valve. Include the piping orientation and any cold-test specification when you request a quotation.

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