This valve is manual directional valve which consists of several paralleled sectional valves, mainly used for centralized controlling of many actuators in hydraulic systems for engineering, agricultural, hoisting and transporting and press machineries.The valve includes an integral relief valve and a check valve. When spool stays in middle position, pressure oil circuit will be unloaded. It has a common pressure port P and tank port O, each section has two working ports connecting hydraulic cylinders or motors. Various spool-spring arrangements (spring centered-without spooling-detented) are available.For relief valve adjusting, when turning adjusting screw in clockwise, the pressure will be increased, otherwise the pressure decreased.

ZF S - L * * - Y* - ****