BY TEMPERATURE CLASS
High-Temperature Valves
Temperature bands used to start a shortlist. Seat, packing and body material still have to be written into the RFQ.
Choosing High-Temperature Valves
High-temperature service requires attention to body material, seating and stem sealing as well as the temperature itself. Pressure-temperature limits and thermal movement can change the appropriate construction. Specify normal duty and the hottest credible operating condition separately.
What to include in the RFQ
- Provide operating/design temperatures, pressures and thermal cycling.
- Request the seat, packing and bonnet construction with assembly rating evidence.
- Confirm actuator isolation, maintenance access and any emissions requirement.
Selection scenario
For a hot process branch, ask bidders to identify the offered sealing system and closing load after thermal cycling. Compare those details with the maintenance plan.
Common selection mismatch
A metal seat or a long bonnet does not by itself qualify the full assembly for every high-temperature fluid and pressure.