... , Forging and Stamping etc.3) Machining Types: Machined by Round Bar and steel plate, Drilling, Milling, Turning, Boring, Slating, Grinding,, NC/CNC ... stainless steel4"API Gate ValveMaterial: Alloy Steel, Stainless SteelMachined from round bar by NC Machine or CNCChecked by Go & No go ...