Brake assurance circuit operative in response to a low brake pip

Details Brake assurance circuit operative in response to a low brake pip Brake assurance circuit operative in response to a low brake pip

1989-05-22

1990-12-18

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Automatic

Equalizing valves

303 9, 303 26, 303 39, 303 86, B60T 1134

Patent

active

049781790

ABSTRACT:
A low brake pipe pressure detecting circuit for a railway train is provided in conjunction with a conventional vent valve device typically associated with the locomotive brake valve device to exhaust the train brake pipe pressure and thereby effect an emergency brake application. Conventional pneumatic pilot valve devices are interconnected with the vent valve device to actuate the vent valve device only for a limited duration following which the pilot valves are automatically reset to effect closure of the vent valve device preparatory to recharging brake pipe pressure to obtain a subsequent brake release.

REFERENCES:
patent: 1895473 (1933-01-01), McCune
patent: 1910543 (1933-05-01), Hewitt
patent: 3781065 (1973-12-01), Kersting
patent: 4472001 (1984-09-01), Fannin

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