The hydraulic solenoid valve is a kind of common control element, which is used to control the hydraulic flow, pressure and direction in the hydraulic system. According to different control methods and functions, hydraulic solenoid valve can be divided into the following types: 1. One-way valve: one-way valve is used to control the hydraulic system of one-way flow of fluid valves. It usually consists of a valve body and a valve core, the valve core can be controlled by electromagnetic force or spring force to open and close the valve. One-way valve can be divided into direct and indirect two types. 2. Directional valve: directional valve is used to control the flow direction of hydraulic fluid in hydraulic system. It is usually composed of multiple valve body and spool, spool movement can be achieved by electromagnetic force or mechanical force. The directional valve can be divided into two-position directional valve, three-position directional…