Dual circuit brake valve differential pressure control mechanism

Details Dual circuit brake valve differential pressure control mechanism Dual circuit brake valve differential pressure control mechanism

1987-02-02

1988-03-08

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Motorman's valves

Multiple motors

1376275, 303 56, B60T 1502

Patent

active

047296070

ABSTRACT:
A dual circuit brake valve is provided with a delivery differential control mechanism which controls the differential between the delivery pressures of the primary and secondary braking circuits. The delivery differential control mechanism includes a spring retainer which is mounted on the end of the stem of the relay valve and which receives a spring-biased plunger. The plunger engages with the actuating member during the brake application to thereby transfer the force of the spring to the relay member and therefore to the valve members of the secondary circuit. This transfer of the spring force reduces the crack open pressure of the valve members controlling communication through the secondary circuit, to thereby reduce the differential between the pressures generated and the primary and secondary circuits.

REFERENCES:
patent: 3580646 (1971-05-01), Ternent
patent: 3712685 (1973-01-01), Hoffman
patent: 3758168 (1973-09-01), Parsons
patent: 3992065 (1976-11-01), Pekrul
patent: 4553789 (1985-11-01), Pugh et al.
patent: 4660894 (1987-04-01), Bartholomew et al.
patent: 4679594 (1987-07-01), Fogg
patent: 4691968 (1987-09-01), Pugh et al.
Patent Abstract of Japan, vol. 9, No. 57, of 13 Mar. 1985, JP 59-192662.

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