The body must be rated for minimum 1965 kPa (19.65 bar) but best to check pressure at highest point on curve (usually closed-valve) and design for that.
The maximum back pressure against the closed valve might be less, and depends on the system details. If the pump is one of a set pumping into a common header (eg duty/standby arrangement) backpressure rating has to be same as for body, above.
Cheers.......Codey
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You may refer API 6D for the valve , as per clause 6.1 , the class may be selected as per ASME B16.34
Once you have decided on the pressure rating class, the tests may be carried out again as per API6D clauses 10.1, 10.2 (stem back seat test) , 10.3 (Hydrostatic test of body), 10.4 (seat test) with sub clauses.
The details may be checked from the API 6D standard (can not duplicate here , however just for information, the Hyd Test of body is 1.5 times and not equal to the rated pressure as decided by the relevant class)
Note: API6D is also ISO14313-1999
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valve pressure rating
Re: valve pressure rating
