Independent continual quick service valve device

Details Independent continual quick service valve device Independent continual quick service valve device

1989-01-17

1989-10-24

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Automatic

Equalizing valves

303 38, 303 82, 303 69, B60T 1542

Patent

active

048757390

ABSTRACT:
A continual type quick service valve adapted to be independently mounted on a railway car to provide local, supplemental venting of the car brake pipe pressure, as long as the brake pipe pressure continues to be reduced externally. This quick service venting of the brake pipe pressure is achieved utilizing a single piston actuated exhaust valve that is either cyclically-operated between open and closed states or is held open continuously depending upon the degree of brake application in effect. By selective tuning, the open duration of the exhaust valve can be made to exceed the duration the exhaust valve is closed during each cycle of operation or to remain open for the duration of the external brake pipe pressure reduction to achieve high operating efficiency.

REFERENCES:
patent: 3716276 (1973-02-01), Wilson et al.
patent: 3988044 (1976-10-01), Hill
patent: 4073544 (1978-02-01), Hart
patent: 4103977 (1978-08-01), Wickham
patent: 4145090 (1979-03-01), Hart
patent: 4157849 (1979-06-01), Wickham
patent: 4175792 (1979-11-01), Hart
patent: 4206949 (1980-06-01), Rathband et al.
patent: 4449759 (1984-05-01), Eder

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