C Design According to MSS · SP-71 Pressure/ Temperature Rating: ANSI B 16.1 Face to Face Dimensions: ANSI B 16.10 Flange End Dimensions: ANSI B 16.1 Wall Thickness: ANSI B 16.1 Valves Tested According to API 598 Main Parts and Materials Number Part Name Material 1 Body Grey Iron/ A126-B 2 Bonnet Grey Iron/ A126-B 3 Seat Stainless Steel/ Brass 4 Disc Ductile Iron + Bronze 5 Gasket Graphite 6 Bolts A307-B 7 Nuts Brass B16 8 Pin Stainless Steel 9 Hinge Pin Brass B16 10 Gasket Brass B16 11 Plug Steel