Applicable standards: 1.Basic design:Api602 & Ansi B16.34 2.Socket-weld(S.W):Ansi B16.11 3.Screwed end(S.E):Ansi B1.20.1 4.Valves test and inspect:Api598 5.Standard material:A105.LF2.F5.F11.F22.F304.F304L.F316.F316L Features: 1.Reduced or full port pact outside screw & yoke 3.Spiral wound gasket of stainless steel 4.Bolted bonnet or welded bonnet 5.Socket welding or threaded ends 6.Replaceable hardfaced seats 7.Size:1/2"-2 1/2"