... small fluid resistance, labor-saving operation, and unconstrained flow direction. 3. The wheel is made of HT200 ... process before delivery.Material Control, Machining Quality Control, In-coming Material Inspection, Assembly Line Quality Control, Leakage Testing, Final ... air. Specialized in development and production of Copper Valves, Gas Valves, Gate Valves, Ball Valve, Radiator Valve, Stop Valve, Check ...