... at ISO9002 3) Good process flow and cost effective Material: Aluminum Alloy, Zinc Alloy, NylonMachining: CNC machining centerInspection : 100% leakage test ... test.Type: Relay Valve, Protection Valve, Unloader Valve, Leveling Valve, Quick Release Valve, Foot Brake Valve, Hand Brake Valve, Drain Valve, governor ...