Quoting Standards Design & Manufacture ANSI B 16.34 Face to face ANSI B 16.10 Pressure-Temp Rating ANSI B 16.34 Flange dimensions to ANSI B 16.5 Test and inspecton API 598 Material of main parts Valve Bady WCB WC1 WC6 WC9 ZGCr5Mo CF8 CF8M ZGCr18Ni9Ti CF3 CF3M Valve Cover WCB 12Cr1MoV WC1 12Cr1MoV WC6 12Cr1MoV WC9 12Cr1MoV ZGCr5Mo 304 CF8 316 CF8M CF3 CF3M Yoke WCB WCB WCB WCB WCB CF8 CF8M CF3 CF3M Disc WCB WC1 WC6 WC9 ZGCr5Mo CF8 CF8M CF3 CF3M Stem WCB WC1 25Cr2MoV 1Cr18Ni9Ti Seat 25 304 304 304 304 304 304 304 304 Seal Wrapped gasket & Reinforced flexible graphite Packing Reinforced flexible graphite Stem Nut ZCuA110Fe3