A hydraulic valve is an automation component operated by pressure oil. It is controlled by the pressure oil of the pressure distribution valve. It is usually used in combination with an electromagnetic pressure distribution valve. It can be used to remotely control the on and off of the oil, gas,hydraulic valve and water pipeline systems of hydropower stations. Commonly used for clamping, control, lubrication and other oil circuits. There are direct-acting type and pilot type,hydraulic valve and the pilot type is mostly used. It is used to reduce and stabilize the oil pressure of a branch in the system. It is often used for clamping, controlling, lubricating and other oil circuits. There are direct-acting type, pilot type,hydraulic valve and stacking type.
According to the purpose, it is divided into one-way valve and reversing valve. One-way valve: Only allow the fluid to be connected in one direction in the pipeline,hydraulic valve and cut off in the reverse direction. Reversing valve: change the on and off relationship between different pipelines. According to the working position of the spool in the valve body, it can be divided into two positions, three positions, etc.according to the number of channels controlled, it can be divided into two, three, four, five, etc.hydraulic valve according to the spool drive mode, it can be divided into manual, motorized, electric , Hydraulic etc. Figure 2 shows the working principle of the three-position four-way reversing valve. P is the oil supply port, O is the oil return port, and A and B are the output ports leading to the actuator.
When the spool is in the neutral position,hydraulic valve all oil ports are cut off, and the actuator does not move; when the spool is moved to the right position, P is connected to A,hydraulic valve and B is connected to O; when the spool is moved to the left position, P and B are connected Pass, A and O pass. In this way,hydraulic valve the actuator can move forward and backward.