API Forged steel Gate Valve Design and manufacture: JPI-7S-36, ANSI B16.34, BS 5352 Socket end: ANSI B16.11 Screw end: ANSI B120.1 Inspection and test: API 598 Body material: A105, F11, F12, F304, F316, F304L, F316L Seating: 13Cr/13Cr, STL/STL, 13Cr/STL, 304/304, 18-8/STL, 18-8/18-8, etc.