SPRING RELAY VALVE Material: Aluminum Alloy Machining: CNC machining center Inspection : 100% leakage test We are rich in experience and ... 1.High quality foot brake valve,hand brake valve,relay valve,protection valve,air dryer,levelling valve and so ... Alloy, NylonMachining: CNC machining centerInspection : 100% leakage test and other test.Application: SINO TRUCK,FAW,FOTON,JAC TRUCKWe also develop ...