B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
303/87
B60T 17/18 (2006.01) B60T 8/34 (2006.01) B60T 8/94 (2006.01)
Patent
CA 1076627
ABSTRACT OF THE DISCLOSURE A shuttle valve is situated between the service brake and emergency brake lines downstream of the brake control valve which modulates both lines. The shuttle valve includes a dif- ferential pressure piston in a cylinder. The piston includes a large diametered end connected to the service brake line and a smaller diametered end connected to the emergency brake line with a port in the side of the cylinder adjacent the small dia- metered end. The air pressure in the service brake line acts upon the large diametered end of the piston and normally main- tains the piston at one end of the cylinder so that the port is closed off by the small diametered end of the piston. However, if the service brake pressure drops below a predetermined min- imum, the piston will move in the cylinder thus uncovering the port and connecting the emergency brake line to the emergency air tank. When the fault is corrected and the pressure builds up in the service brake line, the air pressure acts upon the pis- ton and moves it in the opposite direction thus shutting off the aforementioned port and disconnecting the emergency brake system.
247344
Motor Coach Industries Ltd.
Na
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