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Hydraulic valve is one of the control components in the hydraulic system, which can control parameters such as flowing direction, pressure, and flow rate of the liquid. Hydraulic valve can be classified into direction valve, pressure valve and flow valve by its functions. Different types of hydraulic valves are used for different scenarios and working conditions, for example, the direction valve is used to control the liquid flowing direction, and the pressure valve is used to control the liquid pressure.

The working principle of hydraulic valve is to control the flowing direction, pressure and flow rate of the liquid by the movement of the valve spool. In the direction valve, the movement of the spool will change the flowing direction of the liquid. In the pressure valve, the movement of the spool will change the pressure of the liquid. In the flow valve, the movement of the spool will change the flow rate of the liquid.