BY PRESSURE CLASS
High-Pressure Valves
Service envelope language used in Chinese and ASME/GB catalogues. Class is not a substitute for the nameplate and the standard.
Choosing High-Pressure Valves
At high pressure, material, body construction, seals and end connections must be reviewed together. A valve nameplate rating cannot qualify a lower-rated adapter or tube. Include transient and closing differential conditions when evaluating the full package.
What to include in the RFQ
- Give design/operating pressure and temperature, including credible transients.
- Request the complete assembly rating, material traceability and test basis.
- Check actuator load, seat leakage and every mating connection.
Selection scenario
For a high-pressure instrument isolation point, compare the rated valve, tube and fitting configuration as a system. Document the assembly and examination requirements before installation.
Common selection mismatch
The strongest individual component does not establish the system rating. Do not infer acceptable temperature or fatigue duty from maximum pressure alone.