Tractor relay valve with proportioning

Details Tractor relay valve with proportioning Tractor relay valve with proportioning

B - Operations, Transporting

60

T

303/87

B60T 8/26 (2006.01) B60T 15/20 (2006.01)

Patent

CA 1293289

ABSTRACTION OF THE INVENTION A proportioning control valve for a fluid pressure braking system for a tractor-trailer combination vehicle permits unproportioned communication of control pressure when the tractor is pulling a trailer but proportions communication of control pressure when the tractor is operated without a trailer to establish a proportionally lower pressure level at the outlet of the valve. The control valve, when operating in the proportioning mode, is also responsive to pressure in the brake reservoir. When pressure in the reservoir drops below a predetermined level, the control valve proportions at a rate which increases the pressure level at the outlet at a rate greater than the rate of increase of control pressure until the unproportioned pressure level is attained.

545516

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