Main Parts and Materials NumberPart NameMaterial 1BodyGrey Cast Iron(ASTM A126-B) 2BonnetGrey Cast Iron(ASTM A126-B) 3NutCarbon Steel(ASTM A307) 4BoltingCarbon Steel(ASTM A307) 5BallStainless steel(A182 F304) 6SeatPTFE 7GasketPTFE 8StemStainless steel(A182 F304) 10Gland FlangeGrey Cast Iron(ASTM A126-B) 11Gland BoltCarbon Steel(ASTM A307) 12 Stop CollarCarbon Steel 13LeverSteel 14CirclipCarbon Steel. Application 1.Design and ManufactureANSI B16.1 2.Face to faceANSI B16.10 3.Flange End DimensionsBS4504 4.Working Pressure150PSI Steam Basic Rating 5.Pressure TestAPI598