If the valve does not open within +/- 3% of set pressure then it is considered to have failed the Pre-test! ( out of set pressure tolerance as per ASME)
Now, some customers that we deal with use 10% overpressure! this is their own guide lines set by their inspectors which take into account over...
Chinwar,
Fire-safe testing of ball valves involves two main tests, integral test (to proof the body,trunnion,stem seals) and a function test ( to proof the ability of the valve to close and seal) in the event there is a fire.
The primary seals (elstomers) of the valve can be materials of such...
