Size: NPS 1/2"-30" Pressure: Class 150-1500 Material: 1/2"-2": A105, LF2, F11, F22, F5, F304, F316, F304L, F316L 2"-30": WCB, LCB, WC6, WC9, C12, C5, CF8, CF3, CF3M, CF8M Structure Type: Regular Pattern, Pressure Sealed Pattern, Damping Pattern Standard: Design & manufacture: API 6D, API 602, ASME B16.34, BS 1868 Face-to-face and end-to-end: API 6D, ASME B16.10, DIN 3202 End flange dimension: ANSI B16.5; ANSI B16.47; MSS SP-44; API 605; JIS B2238 BW end dimension: ANSI B16.25 Test and inspection: API 6D, API 598, BS 6755, ISO5208. We can design and manufacture various kinds of check valves according to customer's requirements.