... , truck valves 2) Strict quality control at ISO9002 3) Good process flow and cost effective Material ... CNC machining centerInspection : 100% leakage test and other test.Classification: Relay Valve, Protection Valve, Unloader Valve, Levelling Valve, Quick Release Valve ... Brake Valve, Hand Brake Valve, Drain Valve,Direction control valve,By strict control of every process in production, we improve our ...