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When the brake valve is not braked, the valve seat presses the inlet valve port of the lower shell under the action of the spring, closes the inlet channel, and the compressed air can not lead to the brake chamber, and the brake valve is in a non-working state.
When the brake pedal is depressed, the adjusting screw on the puller presses the tappet, opens the valve seat through the balance spring assembly and the core rod, and the compressed air in the air reservoir enters the front and rear brake chambers respectively through the inlet valve port, producing braking effect.
When the brake pedal is pressed to maintain a certain position Yi, due to the effect of the balance spring assembly, the valve seat will close the inlet and outlet ports, thus maintaining a constant air pressure in the brake chamber.
When the brake pedal is released, the balance spring assembly and core rod are raised by the return spring, and the valve seat is also lifted by the valve seat spring to contact the valve port of the lower housing of the brake valve, closing the channel between the air reservoir and the brake chamber. At this time, the core rod continues to rise, and its lower end face forms an exhaust gap with the valve seat. The compressed air in the brake chambers of the front and rear wheels returns from the channel, and is discharged into the atmosphere through the inner hole of the core rod through the outlet of the upper housing of the brake valve, which is the exhaust noise heard during driving.
The damage of brake valve parts is similar. Common faults include:
(1) Rubber nylon diaphragm (new type) or stainless steel diaphragm (old type) is deformed and cracked.
(2) The inlet and outlet valves are worn and grooved and not closed tightly.
(3) The spring force of the brake valve is insufficient or does not meet the technical standards.
(4) Cracks, deformation or nicks appear on the control valve housing.
