Hydraulic seat pressure test (in forward & reverse directions) Valve in closed position Structural integrity of seat under stress 100 1. thread408-210466: What is 'Bubble Tight Shutoff' ? BS 6755 Part 1/ API 598 Test certificate Vendor Vendor Inspector Inspector Purchaser 5. thread408-229560: Control Valve Leakage Calculation thread408-216731: Valve passing at site So a comparison is not feasible, unless you fix a valve size and a test pressure (at least).įor more information about this issue, please take a look at: In particular, Class VI depends proportionally on the differential pressure and on the square of valve ND. Leakage Classes defined by IEC 60534-4 or equivalent FCI-70-2, instead, depend on the "valve rated capacity" or on the test pressure, in addition to the valve size. ![]() The following Rates are multiples of "Rate B". ![]() ![]() a few ml/min, in a linear function of the valve size. which is more or less the same as API 598 for "resilient seats". no air bubbles or no liquid drops) for the specified test duration. However, "Rate A" means "no visible leakage" ( i.e.
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