Standard

Design and Manufacture: API 602,BS1868 or ASME B16.34
Inspection and Test: API 598/API 602
End flange dimension: ASME B16.5
Butt weld ends dimension: ASME B16.25(BW)
Face to face,end to end: ASME B16.10
Thread ends:ASME B1.20.1(NPT)
Socket weld ends:ASME B16.11(SW)
Pressure-temperature ratings: ASME B16.34
NACE: NACE 0175
Piston type check valves
Material
ASTM A105,A182 F304 304L 316 316L 321 F11 F22,A350 LF2 LF1 LF3 or by customers 
(Cast Steel, Alloy Steel, Stainless Steel, Special Steel)
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