Patent ID: 7270145

Claim:
An air system with a pressure reducing valve having a discharge port in communication with the air system and a vent comprising: a valve body, said valve body biased to form a seal between the discharge port and the vent; a governor for monitoring the air pressure in the system, said governor generating a signal when a first threshold pressure within the system is reached; wherein, said valve body is movable against the bias in response to the signal generated by said governor, such that the discharge port is in communication with the vent thereby allowing air to escape from the system; and wherein, in the case of a governor failure when said valve body is not moved when the first threshold pressure within the system is reached, said valve body is movable against the bias in response to a second threshold pressure, greater than the first threshold pressure, within the system being reached such that the discharge port is in communication with the vent thereby allowing air to escape from the system.