I am working on verification for many our valves. For seat leakage (internal leak), as my experience, API, AWWA, FM etc. they have the standards for leak rate and test specification. But my current company product line is instrument valves with low flow (small Cv). We use HE sniffer to detect external leak (10e-5) and seat leakage is check by bubble in water or liquid leak detector. The time duration is variant depend on operator, also the connect tube size is different too. So, is there standard or common rule for leakage? Out instrument valve are for petrochemical, refinery and so on. Although attached link are for control valves and regulators there are some comments and pointers for small Cv valves that could possibly be to your interest.As a thought wouldnt the best procedure be to be at least at par with competitors, or hopefully better by proving you can go below leakage at known tests, if possible?

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