which is medium-nigh pressure integrity way direction changed valve, over-flow valve, over load valve,single way valve and oiloffset valve etc may be installed per different customer's requirements.  Over-flow valve may adjust the system pressure, over-load valve may combined the working pressure of single oil cylinder, singleoil eylinglevalve is to prevent oil returning, direction changed valve function have A,O,Y,Petc, it may be combined random.  The directional changed level has two installg ways for different operation.  The valve is used parallel connection oil route.  It has pressure releasing outlet to connect other hydraulic components to provide power source. The sealing is specially designed sith good sealing.  The valve is widely used in the hydraulic system of forklift environment vehicle and light loading machines.