Main check valve products:Swing check valve,Lift check valve,Wafer type check valve,Forged steel check valve Design & manufacture standard: API6D,BS1868,API594(Wafer type) Face to face dimensions: ANSI/ASME B16.10 Flange connection: ANSI/ASME B16.5 for NPS24,ASME B16.47A/MSS SP-44 for NPS>24. Butt-welding end dimensions: ANSI/ASME B16.25 Socket-welding dimensions: ANSI/ASME B16.11 Screw ends dimension: ANSI B1.20.1 Inspection & test standard: API6D,API598. Connection ends:RF,RTJ,BW,SW,Wafer type Pressure: 150Lb,300Lb,600Lb,900Lb 1500lb 2500lb etc. Nominal diameters: CAST: 2"~ 60" FORGED: 1/2"~ 2" Major materials: CAST: WCA,WCB,WCC,WC1,WC4,WC6,WC9,C5,C12,CA15,CF8,CF3,CF3M,CF8,CF8M,CN7M,CD4MCU,CK3MCUN,LCA,LCB,LCC,LC3,MONEL 400 FORGED: A105,A106,F1,F2,F11,F22,F5,F9,F6A,F304,F304L,F316,F316L,B473,F50,F44,LF2.LF3 etc.