... 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 ... Slating, Grinding,, NC/CNC Machining etc.4) Tolerance is controlled by CMM Machine.5) OEM Service6) Special design is ... ISO etc.valve stem of 303 stainless steel4"API Gate ValveMaterial: Alloy Steel, Stainless SteelMachined from round bar by ...