A standard for allowable leak rates during ball valve testing,addressing shutoff valves (bubble tight) instead of control valves (which leak like a sieve). You need a copy of API Standard 598, Valve Inspection and Testing. However, you should apply a valve specification that requires the bubble-tight leakage testing per API STD 598 before requiring the valve to comply.(in particular: API 598, EN 12266-1 and ISO 5208... pay attention to the edition dates, as the standards may have been revised in the meantime!). But it must be observed that, unluckily, the most common standards about seat leakage testing of (on-off) valves usually refer to particular fixed test conditions, and to not take in account the influence of pressure, type of fluid and temperature on the leakage flow rates... so you may want to try, on your own, to adapt and/or extend the FCI-70-2 concepts to on-off valves... and try to get your Customer ratiocinating on that (and this seems to be the hardest thing. About this issue, I'd suggest to see thread408-150132 and EN 1779 standard mentioned there.

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