The electropneumatic valve consists of a body 3, a cover 1, an electromagnet 4, a stem 5, springs 6, valves 8.
Air from the pneumatic system is supplied to outlet I into the cavity in the valve cover
When the electromagnet is turned on, the stem, extending, presses the upper valve 8 against the body seat 3.
In this case, the lower valve 8 moves away from the seat and air from the cavity in the valve cover through the channel in the body and output III enters the pneumatic actuating chambers of the control valve or into the body of the pneumatic cylinder of the power take-off.
When the solenoid is turned off, the lower valve is pressed against the body seat by a spring, and the upper valve moves away from the seat.
The air from the pneumatic chamber is released into the atmosphere through outlet II.
A distributor is fixed on the control valve of the KamAZ-55102 dump truck, which serves to distribute the oil flow either to the hydraulic cylinder of the tractor or to the hydraulic cylinder of the trailer.
Seats 6 are installed in the body, fixed with retaining rings 5.
The threaded end of the valve 8 with the membrane 12 enters the cavity of the pneumatic chamber, closed by the cover 13.
A spring holds the valve in the leftmost position.
The seats of the bushings and the valve are sealed with rings 9 and 10, respectively.
Possible leaks through the valve seals are removed on the one hand through the drain hole of the plug 4, on the other - through the opening of the pneumatic chamber under the membrane.
Oil passes through the hole in the distributor housing under valve 7 through the seat, fitting and enters the hydraulic cylinder line of the dump truck.
When compressed air is supplied to the cavity of the pneumatic chamber above the membrane, valve 8 moves to the right, the dump truck hydraulic cylinder line is blocked and oil begins to flow through fitting 2 into the trailer hydraulic cylinder line.