Introduction to the knowledge of hydraulic valves

- Jun 25, 2019-

Working principle of hydraulic valve 


The hydraulic valve includes a spool, a valve body, and a device that drives the spool to move relative to each other within the valve body. It is used in the hydraulic system to control the pressure, flow and direction of the flow, ensuring that the actuators work as required.


The basic working principle of the hydraulic valve: the relative movement of the valve core in the valve body to control the opening and closing of the valve port and the size of the valve port to achieve pressure, flow and direction control; and the flow through the valve port and the differential pressure before and after the valve port It is related to the valve port area and always satisfies the pressure flow equation.


The role of hydraulic valves 


 The hydraulic valve is used to control the flow direction of the oil in the hydraulic system or to adjust its pressure and flow, so it can be divided into three categories: directional valve, pressure valve and flow valve. A valve of the same shape can have different functions depending on the mechanism of action. The pressure and flow valves use the throttling of the flow section to control the pressure and flow of the system, while the directional valve uses the replacement of the flow passage to control the flow direction of the fluid. That is to say, although there are many different types of hydraulic valves, they still maintain some basic commonalities.