... valve,hand brake valve,relay valve,protection valve,air dryer,levelling valve and so on.1.High quality foot brake valve ... ,hand brake valve,relay valve,protection valve,air dryer,levelling valve and so on2. Strict quality control at ISO 9001 ... , Zinc Alloy, NylonMachining: CNC machining centerInspection : 100% leakage test and other test.Application: SINO TRUCK,FAW,FOTON,JAC TRUCKWe also ...