Fluid-pressure and analogous brake systems – Releasing
Patent
1982-09-08
1984-10-23
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Releasing
303 33, 303 86, B60T 1502
Patent
active
044784600
ABSTRACT:
This invention relates to a railway braking system in which a drop in brake pipe pressure calling for brake application initiates a pilot pressure and this pilot pressure is used to operate other valves pneumatically to effect braking. In this system, during the initial part of a brake application, air flows to atmosphere through a pilot exhaust choke. To avoid problems during release of the braking, it is proposed to isolate or restrict this pilot exhaust choke during at least the initial part of the brake application stage. To achieve this, an interlock valve is introduced into a passage between a release ball valve and a pilot exhaust choke. The interlock valve is operated by a diaphragm biassed by a spring and separating two chambers. Brake pipe pressure is applied to the first chamber and auxiliary reservoir pressure to the second chamber. A very small drop in brake pipe pressure closes the valve and cuts off connection between the release ball valve and the pilot exhaust choke.
REFERENCES:
patent: 3707314 (1972-12-01), Paginton
patent: 4125292 (1978-11-01), Worbois et al.
patent: 4163587 (1979-08-01), Limozin et al.
patent: 4378950 (1983-04-01), Hart et al.
Butler Douglas C.
Westinghouse Brake and Signal Co. Ltd.
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