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answered Sep 5, 2014 by cobiesmith (3,310 points)

As per API Std-598 the new valves maximum allowable leakage rates are as follows:

Valve   Type Maximum Leakage Allowed, gpm (m3/sec)
Gate 0.0003 (1.9 X 10-8)
Globe 0.0003 (1.9 X 10-8)
Plug 0.0003 (1.9 X 10-8)
Metal Seated Check 0.0006 (3.8 X 10-8)

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