20775173 volvo truck relay valve

  The working principle of the Solenoid valve, the Solenoid Valve has a closed cavity, there are holes in different positions, each hole leads to a different oil pipe, the middle of the cavity is the valve, the two sides are two solenoids, which side of the magnet coil energized valve body will be attracted to which side, by controlling the movement of the valve body to block or leak out different oil discharge holes, and the oil inlet hole is normally open, the hydraulic oil will enter different oil discharge pipes, and then push the piston of the oil gang through the pressure of the oil, the piston drives the piston rod, and the piston rod drives the mechanical device to move. In this way, the mechanical movement is controlled by controlling the current of the electromagnet.

  The above is the general principle of the solenoid valve, in fact, according to the temperature, pressure and other conditions of the flowing medium, such as the pipe has pressure and the self-flowing state is pressure-free. The working principle of solenoid valves is different.