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A pressure relief valve is a safety device, and it is sized from the relieving scenario rather than from the line — fire case, blocked outlet, thermal expansion and control failure each give a different required orifice. Set pressure, back pressure and the relieving temperature all have to be stated, because built-up or superimposed back pressure changes whether a conventional valve is acceptable or a balanced bellows or pilot-operated design is required. These need a datasheet and usually certification.
The more of this you send, the closer the first quotation lands.
| Set pressure | State units and whether gauge or absolute |
|---|---|
| Relieving scenario | Fire case, blocked outlet, thermal expansion, control failure |
| Required relieving capacity | Mass or volume flow at relieving conditions |
| Back pressure | Superimposed and built-up; decides conventional vs bellows vs pilot |
| Valve type | Conventional, balanced bellows, or pilot operated |
| Orifice designation | API letter D through T, if already sized |
| Inlet and outlet size and rating | e.g. 2 in x 3 in, ASME 300 x 150 |
| Body and trim material | WCB, CF8M, Hastelloy; soft or metal seat |
| Fluid and phase | Gas, vapour, liquid, or two-phase |
| Relieving temperature | At the relieving condition, not normal operating |
| Certification | ASME Section VIII UV stamp, or PED, if required |
| Sour service | State if NACE MR0175 applies |
Select one and it travels with your enquiry. Not sure? Leave it and describe the application instead.
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