... 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 ... etc.3) Machining Types: Machined by Round Bar and steel plate, Drilling, Milling, Turning, Boring, Slating, Grinding,, NC/CNC ... , ISO etc.valve stem of 303 stainless steel4"API Gate ValveMaterial: Alloy Steel, Stainless SteelMachined from round bar by ...