... 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,BS, JIS, UNI, ANSI, ISO etc. ... Standard: ASTM, BF,BS, JIS, UNI, ANSI, ISO etc.valve stem of 303 stainless steel4"API Gate ValveMaterial: Alloy Steel, Stainless ... Test can be made before packing. JIS API lengthening Valve Stem