AZ992593000027 Relay Valve Bracket
The relay valve is part of the car's air brake system. The air inlet of the relay valve is connected to the air reservoir, and the air outlet is connected to the brake air chamber. When the brake pedal is depressed, the output air pressure of the brake valve is used as the control pressure input of the relay valve. Under the action of the control pressure, the air inlet valve is pushed open, so the compressed air enters the brake directly from the air reservoir through the air inlet. The brake air chamber does not need to flow through the brake valve, which greatly shortens the inflation pipeline of the brake air chamber and accelerates the inflation process of the air chamber. Therefore, the relay valve is also called the acceleration valve. The relay valve is used at the end of a long pipeline to quickly fill the brake chamber with compressed air from the air reservoir.
Relay valve applications
Such as in the braking system of a trailer or semi-trailer. In the braking system of a truck, the relay valve plays a role in shortening the reaction time and pressure build-up time. Generally, differential relay valves are used. Prevent the simultaneous operation of the driving and parking systems, the overlap of forces in the combined spring brake cylinder and the spring brake chamber, thereby avoiding overload of the mechanical transmission components and rapid charging and exhausting of the spring brake cylinder.
Generally, differential relay valves are used. Prevent the simultaneous operation of the driving and parking systems, the overlap of forces in the combined spring brake cylinder and the spring brake chamber, thereby avoiding overload of the mechanical transmission components and rapid charging and exhausting of the spring brake cylinder.
Differential relay valve
1. Purpose: When the service brake and parking brake systems are operated at the same time, the forces in the combined spring brake cylinder and the brake chamber (spring brake chamber) are prevented from overlapping, thereby preventing the mechanical transmission components from being overloaded and causing the spring brake cylinder to Quickly charge and exhaust. 2. Working principle: Driving state: Under driving state, the handbrake valve continuously supplies air to cavity A through port 42. Piston (a) and piston (b) are pressed downward, close the exhaust valve (e), push the valve stem (c) downward, open the intake valve (d), and let the compressed air from the air reservoir pass through port 1 Through the output of port 2, compressed air is supplied to the spring brake air chamber connected to port 2, and the spring brake is released.
When the service brake system operates alone and the main brake is operated, the compressed air enters chamber B through port 41 and presses piston b down. Due to the reaction force of chamber A and chamber C, the pressure reaching chamber B has a differential effect on the differential relay. The operation of the valve is not affected, the compressed air continues to flow to the spring brake part of the spring brake chamber, thereby releasing the brake, and at the same time, the compressed air directly from the tractor brake valve reactivates the diaphragm part.
When the parking brake system operates alone, when the hand brake valve is operated, the A chamber is completely emptied. The piston (a) is not under pressure and is pushed upward by the piston (b) exposed to the air pressure of the air reservoir in the C chamber. The exhaust valve (e) opens, and at the same time the valve stem (c) rises and closes the intake valve (d). In this way, the spring brake cylinder discharges the gas through port 2, valve stem (c) and exhaust valve 3 according to the position of the hand brake handle, thereby spring braking.
During partial braking, the exhaust valve (e) is closed after exhaust, and the air pressure in chambers A and C rises in balance and the differential relay valve is in a balanced position. However, under full braking, the air inlet (d) continues to open. When the main brake and the spring brake are activated at the same time A. When the service brake is exhausted, that is, when the spring brake cylinder is activated, the compressed air enters the B chamber through port 41 and acts on the piston (b). Since the C chamber is emptied, the piston (b ) moves downward, closing the exhaust valve (e) through the valve stem (c) and opening the intake valve (d) at the same time. The compressed air from port 1 reaches port 2 through chamber C, and enters the spring brake chamber.
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