What is a circuit protection valve, and what is its function?

A circuit protection valve (CPV) is a type of valve used in air brake systems on heavy-duty vehicles, such as trucks and buses. Its primary function is to protect the brake system in case of a failure, preventing the loss of air pressure and ensuring that the brakes continue to work properly.
The CPV is usually located on the supply line between the air compressor and the reservoirs, and it is designed to close automatically if the air pressure drops below a certain level. When this happens, the CPV isolates the failed section of the system, preventing the air pressure from escaping and allowing the remaining brakes to continue to function. This helps to maintain control of the vehicle and reduce the risk of an accident.
In addition to its primary function, the CPV also serves as a pressure regulator, ensuring that the pressure in the brake system remains within safe limits. This helps to prevent damage to the brakes and other components of the system, and it can also improve the overall performance and efficiency of the vehicle.
Overall, the circuit protection valve is an essential component of any air brake system, providing critical protection and ensuring the safe and reliable operation of heavy-duty vehicles.
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