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Size DN25 – DN600 Type Self acting non return valve Rating PN 10 & PN 16 General design and manufacture API 6D / ANSI B 16 Valve face to face dimension API 6D / ANSI B 16 Flange Standard Conformity ANSI 150/ DIN PN 10 & PN16, BS10 Testing API 598 / ANSI B 16