Air brake control valve system

B - Operations – Transporting – 60 – T

Patent

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Details

B60T 13/38 (2006.01) B60T 13/26 (2006.01) B60T 17/04 (2006.01)

Patent

CA 2087386

AIR BRAKE CONTROL VALVE SYSTEM ABSTRACT OF THE DISCLOSURE An air brake control system for use in truck trailers, including tandem trailers, having at each axle compressed-air spring brakes and service brakes with each trailer being coupled to receive compressed air through an emergency (supply) gladhand and to receive service brake signals through a service (control) gladhand and which includes an integrated brake valve system for each trailer within a common valve housing. Each integrated brake control valve includes a spring brake valve cluster having a non-return check valve connected to receive and pass air pressure from the emergency supply and deliver it to the spring brakes and an air pressure responsive shuttle operative to open the check valve whenever the emergency supply line pressure falls below a predetermined spring brake isolation pressure above which the spring brake holding pressure is not affected by fluctuations of the emergency supply pressure, an air tank supply valve cluster connected between the emergency supply and a reservoir and operative to sense pressure in the emergency supply and to open at a spring brake threshold pressure above the predetermined spring brake isolation pressure to pass air to the reservoir and to close air passage to the reservoir to prevent supply line pressures from dropping below the threshold level during failure of the system elements; and a non-compounding valve cluster for releasing service brake pressure to atmosphere whenever, due to loss of pressure in the emergency supply lines, the spring brakes have been activated.

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