Gate Valve stem 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, ... Turning, Boring, Slating, Grinding,, NC/CNC Machining etc.4) Tolerance is controlled by CMM Machine.5) OEM Service6 ... , BF,BS, JIS, UNI, ANSI, ISO etc.valve stem of 303 stainless steel4"API Gate ValveMaterial: Alloy ...