Double Block & Bleed Valve Selection Guide
Double block and bleed valve selection guide — dBB valve selection guide for integral DBB, double-ball and trunnion DBB valves, including isolation philosophy, bleed connection, bore, class, seats and testing.
Double Block & Bleed Valve Selection Guide: information to prepare before quotation.
DBB valve selection guide for integral DBB, double-ball and trunnion DBB valves, including isolation philosophy, bleed connection, bore, class, seats and testing.
Recommended workflow
Start with service conditions, then confirm valve construction and project compliance. This order avoids choosing a valve from only one product name or pressure class while missing the engineering constraints that control the final design.
- Define the required isolation philosophy
- Confirm whether one DBB valve replaces multiple line valves
- Select integral, double-ball or trunnion DBB construction
- Confirm full bore or reduced bore
- Define vent and bleed connection arrangement
- Review seat direction and cavity pressure behavior
- Confirm fire-safe and fugitive-emission requirements
- Check face-to-face and piping loads
- Specify materials, testing and documentation
Use the checklist with project documents
Attach the piping class, valve datasheet and applicable project specifications when available. State any mandatory deviation format, document list, inspection witness points and painting requirements in the RFQ.
Double Block & Bleed Valve Selection Guide FAQ
Why use a DBB valve selection?
It helps provide complete technical data and reduces clarification cycles before quotation.
Should project specifications be sent with the datasheet?
Yes. The valve datasheet should be reviewed together with the governing valve, material, testing and coating specifications.
Can the manufacturer select missing data automatically?
Missing data should be clarified rather than assumed when it affects design, materials, safety, compliance, price or delivery.