Designed to comply with API 594 Adopting dual plate design for efficient sealing Valve inspection and testing comply with API 598 Available in series F16 and series F125 Series F16 check valve compatible with DIN, BS flanges Face to face according to ISO 5752 basic series 16 (wafer long) F125 check valve compatible with ANSI 125/150 flanges Available in size 2 to 24 inches Available in wafer type body Materials list: Body materials: cast iron, ductile iron Disc: ductile iron (with nickel plating or nylon coated), SS 304, 304L, 316, 316L, aluminum-bronze Seat: NBR, EPDM, neoprene, PTFE, Viton Shaft: SS304, SS316, SS410 Spring: SS304, SS316, SS410 Seal washer: NBR, EPDM, neoprene, Viton