Tilting Disc Check valve Design and Manufacturing : API6D,BS1868 Flange dimension: ASME B16.5 ASME B16.47 BW end: ASME B 16.25 Face to Face dimension:2'' to 26'' as per ANSI B 16.10 26'' above As per Manufacture's Standard Inspection: API598 Material: Stainless Steel / Carbon Steel /Alloy Steel Type: 2PCS Body, Tilting Type Disc ,FLexible Seat Ring for 150LB to 600LB Pressure seal cover , Tilting Type DIsc , FLexible Seat ring for 900LB above Pls contact Caminix Valve for more information. Thank you .