Is there any Europe Standards and US standards define the BFV leakage rate?

[bao2ye]

API 609, API 598 ??
Thanks in advance.

Bao2

 

[EnergyMix]

According to Engineering Toolbox, API 609 covers: Butterfly Valves: Double Flanged, Lug- and Wafer-Type. The standard covers design, materials, face-to-face dimensions, pressure-temperature ratings, and examination, inspection, and test requirements for gray iron, ductile iron, bronze, steel, nickel-base alloy, or special alloy butterfly valves that provide tight shutoff in the closed position and are suitable for flow regulation.

API 598 covers: Valve Inspection and Testing. The standard covers inspection, supplementary examination, and pressure test requirements for both resilient-seated and metal-to-metal seated gate, globe, plug, ball, check, and butterfly valves. Pertains to inspection by the purchaser and to any supplementary examinations the purchaser may require at the valve manufacturer's plant.

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[NGiLuzzu]

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I believe that Who writes the valves' specification should define the maximum allowable seat leakage (and test procedure) based on the specific service conditions and actual plant needs: this can be done either by using customized criteria or, most likely, by choosing among the leakage rates or classes defined by API 598, EN 12266-1, ISO 5208, ANSI/FCI 70-2 and/or IEC 60534-4 standards, just to mention the most common ones.

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I'm not aware of any leakage test standard defining acceptance criteria based on valve type only, and I believe this in not by chance, because “the required leak tightness shall be related to the function of the object under consideration” (as also EN 1779 standard says, for instance).

Hope this helps,​

‘NGL​