... 2)4"API JIS Gate Valve 3)Checked by Go & No go gage ... 4)Surface Polishment and NDT Test 5)ISO9001:2 Gate Valve StemsStandard: ASTM, BF,BS, JIS, UNI, ANSI, ISO ... ASTM, BF,BS, JIS, UNI, ANSI, ISO etc.valve stem of 303 stainless steel4"API Gate ValveMaterial: Alloy Steel, Stainless SteelMachined ... be madeSurface be polished1. We cast and machine stems of different sizes and types.2. The materials include ...