... 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, ... Casting, Die Casting, Centrifugal Casting, Forging and Stamping etc.3) Machining Types: Machined by Round Bar and steel plate, ... : ASTM, BF,BS, JIS, UNI, ANSI, ISO etc.valve stem of 303 stainless steel4"API Gate ValveMaterial: Alloy Steel ...