SWING CHECK VALVE SIZE 18 INCH CLASS 150# RF BODY MATERIAL STAINLESS STEEL 304 VALVE COVER STAINLESS STEEL 304 DISC STAINLESS STEEL 304 ACCORDING API TRIM 2 SEAT RING STAINLESS STEEL 304 API TRIM 2 GRAPHITE PACKAGING,JOINT MATERIAL STAINLESS STEEL WITH GRAPHITE ENCAPSULATION COMPLY API 603,ASME B16.34