Proportioning control valve with spring biased control piston

Details Proportioning control valve with spring biased control piston Proportioning control valve with spring biased control piston

B - Operations, Transporting

60

T

137/81

B60T 11/12 (2006.01) B60T 8/18 (2006.01) B60T 11/34 (2006.01)

Patent

CA 1286947

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. When the pressure level at the control port exceeds a predetermined level established by a spring, 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.

554153

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