China Swing Check Valve: pressure sealing, butt welded end connection, 2"-36", DN50-DN900, Class 600-Class 1500 LB, PN100-PN250, WCB/LCB material. Detail Information Design & Manufacture: API 6D, BS 1868, ASME B16.34; Face to Face: API 6D, ASME B16.10, DIN 3202; Connection End: ASME B16.5, ASME B16.11, ASME B16.47, DIN 2543-2550; Test and Inspection: ISO 5208, API 6D, BS 6755. Sizes: 2"-36" or DN50-DN900 Pressure Rating: Class 600-Class 1500 LB or PN100-PN250 Material: WCB, LCB, WC6, WC9, C12, C5, CF8, CF3, CF3M, CF8M, etc. Application: Industrial Usage