Inner relief valve: The relief valve inside the valve body is able to adjust the hydraulic system working pressure. Oil way: Parallel circuit, power beyond option Control Way: Manual control, pneumatic control, hydraulic and electric control for optional. Valve construction: monoblock construction, 1-5 levers. Spool Function: O, Y, P, A. The valve is widely used in the hydraulic system of forklift environment vehicles and light loading machines.