Select a high-pressure plug valve by confirming maximum working pressure, nominal size, union figure and orientation, media and temperature compatibility, operating method, inspection status, and documentation requirements.
Start with the full operating envelope
A useful valve specification starts with more than nominal size. Document the maximum working pressure, expected temperature range, media, flow direction requirements, cycling frequency, and any sour-service or material constraints.
Confirm the connections
Connection details must match the rest of the pressure-control system. Record union figure, size, and male or female orientation. Avoid relying on a general description such as “two-inch valve” because several connection families may share the same nominal size.
Review operation and maintainability
- Confirm the required operating method and available clearance.
- Verify seal and trim suitability for the intended media.
- Ask for traceability and current inspection information.
- Plan isolation, depressurization, and maintenance around the site procedure.
Make the RFQ specific
A precise RFQ reduces clarification cycles. Use the drawing number when one is available and include every application constraint that affects safe configuration.
Frequently asked questions
What is the first specification to confirm?+
Confirm the maximum working pressure and ensure the valve’s documented rating meets the complete application envelope.
Why does end orientation matter?+
Male and female union ends determine how the valve fits into the line. The wrong orientation can delay rig-up or require additional components.