Heavy Truck Parts Solenoid Valve is composed of solenoid and core, is a body containing one or several holes. When the coil is energized or powered off, the operation of the core will cause the fluid to pass through the valve body or be cut off to change the direction of the fluid. Electric valve drive is generally with a motor, more resistant to voltage impact. Solenoid valve is fast open and fast close, generally used in small flow and small pressure, the requirements of the switching frequency of the electric valve. The opening degree of the electric valve valve can be controlled, the state is open, off, half open and half off, can control the flow of the medium in the pipeline and the solenoid valve can not meet this requirement.