1. Hydraulic valve is an automatic element operated by pressure oil. It is controlled by the pressure oil of the pressure distribution valve. It is usually used in combination with the electromagnetic pressure distribution valve to remotely control the on-off of the oil, gas and water pipeline systems of hydropower stations. There are direct-acting type and pilot type.
2. The acting hydraulic valve is used to control the flow direction of oil in the hydraulic system or adjust its pressure and flow. It can be divided into three categories: direction valve, pressure valve and flow valve. A valve with the same shape has different functions due to different action mechanisms.
3. The pressure valve and flow valve control the pressure and flow of the system by throttling the flow section, while the direction valve controls the flow direction of the oil by replacing the flow passage. There are various types of hydraulic valves with some basic similarities.