Trailer control valves are employed in a variety of applications. The most common application is to provide independent control of trailer service brakes. They are a type of graduating control valve that utilizes a cam, a cam follower and a graduation spring. These valves also employ a self-returning handle.
In the event of an electrical or pneumatic failure, the valve can be switched to operate in a braking mode. This allows the valve to function with minimal pressure reduction at the control input. Moreover, the valve is equipped with an additional chamber that is used in unlikely circumstances.
A pneumatic control circuit (26), which is connected to the service brake system, controls the control piston of the trailer control valve. It is essential to the functionality of the service brake system. When the circuit is closed, the valve cannot be operated. However, it is possible to achieve the desired control pressure if the electrical control circuit is working.
Several controls are integrated into the trailer control module. One is the pneumatic control circuit. The circuit is used to send a pneumatic brake pressure request signal to the trailer control valve. Another component is the retention valve, which is switched into a closed position by the module. Pneumatic air can be introduced into the control piston of the trailer control valve from the reservoir.
When the valve is in an open position, the inlet valve 48 monitors the line 58.2 and the control chamber 89. If the current is interrupted, the inlet valve 48 closes off communication with the control chamber. On the other hand, if the current is interrupted, the outlet valve 47 monitors the line 61 leading to the pressure relief location 3. Using simple means, the valve can be configured to control the compressed air consumer in a braking condition.
When the circuit is in a functional state, the electrical control circuit takes precedence over the pneumatic control circuit. The pressure sensor 49 is attached to the control line 70 by line 72. Control electronics 45 are used to modulate the electrical brake pressure request signal. As a result, the system operates with high functional reliability.
Alternatively, the control piston can be directly controlled. In this case, the control piston is installed regardless of the control circuit.
To rapidly increase or decrease the pressure of compressed air equipment and to shorten the response and pressure build-up times in air braking systems.
Features and Innovation
---Relay valves for service brake and parking brake applications shortens brake response times
---Integrated check valves for parking brake applications.
---Relay valves with load control can adjust the front axle brake pressure to vehicle loads.
---Overload protection valves help prevent addition of actuating forces when service and parking brake are actuated simultaneously.
Customer Value
---Better brake response times deliver shorter stopping distance.
---Quick to apply and release parking brake.
---Modular design concept enables fast installation and easier maintenance.
---Saves energy by reducing the spring-load pressure.
---Integrated check valves lower costs and shortens installation time.
---Wide portfolio of valve variants.
Application
---Trailer, Off-Highway, Bus.
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