The driver's brake valve is a complicated valve system for controlling the compressed air brake of a railway vehicle. Depending on its setting, it controls whether the brake pipes of a compressed air brake are evacuated and thus whether braking is applied or maintained; or if the brake pipes are connected to a compressed air reservoir, it controls whether the brakes are released again or remain released.
The driver's brake valve is a complicated valve system for controlling the compressed air brake of a railway vehicle. Depending on its setting, it controls whether the brake pipes of a compressed air brake are evacuated and thus whether braking is applied or maintained; or if the brake pipes are connected to a compressed air reservoir, it controls whether the brakes are released again or remain released.
Source: Wikipedia "Driver's brake valve" · CC BY-SA 4.0
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