Applicable standards: 1.Basic design:Api600 & Ansi B16.34 2.Face to face:Ansi B16.10 3.Flanged end (F.E):Ansi B16.5 4.Valves test and inspect:Api598 5.Standard material:A216 WCB. A351 -CF8. A351-CF3M. A351-CF8M. A351-CF3. Features: 1.Outside screw & yoke 2.Flanged ends 3.Welde replaceable hardfaced seats 4.Solid wedge 2"-3" 5.Flexible wedge 4"-12"