The Rexroth hydraulic valve we often say is an automation component operated by pressure oil. It is controlled by the pressure oil of the pressure control valve and is usually used in combination with the electromagnetic pressure control valve. It can be used to remotely control the oil, gas, and water pipeline systems of hydropower stations. On and off. Commonly used for clamping, control, lubrication and other oil circuits. There are direct-acting type and pilot type, and the pilot type is mostly used.