Material: Aluminum Alloy, Zinc Alloy, Nylon Machining: CNC machining center Inspection : 100% leakage test and other test. Classification: Relay Valve, Protection Valve, Unloader Valve, Leveling Valve, Quick Release Valve, Foot Brake Valve, Hand Brake Valve, Drain Valve, Electro Valve,Direction Control Valve,gearbox valveGoverner By strict control of every process in production, we improve our quality in consistency. By improving the process flow and standardize operation, webring downour cost. So we can supplied good products with competitive price.