Hydraulic valve is the most common system in industrial production. It is mainly used to control the flow direction of oil in the hydraulic system, and can also effectively regulate the pressure and flow. There are three types of hydraulic valves, namely pressure valve, directional valve and flow valve. For valves with the same shape, enterprises can choose different functions according to their different action mechanisms. Although there are many kinds of hydraulic valves, these hydraulic valves always have some common points. From the structure of hydraulic valve, each hydraulic valve includes valve body, valve core and
