Control valve device arranged for direct or graduated release op

Details Control valve device arranged for direct or graduated release op Control valve device arranged for direct or graduated release op

1984-08-20

1985-12-17

Reger, Duane A.

Fluid-pressure and analogous brake systems

Releasing

Motor

303 36, B60T 1554

Patent

active

045589070

ABSTRACT:
In a brake control valve device for railway vehicles in which a bias spring acts on the piston stack assembly of the valve device, an additional air reservoir and a differential check valve are arranged to assure proper full service brake pressure, when the control valve device is operated in a direct release mode, thereby overcoming the effect of the bias spring in producing a force balance to cause the piston stack assembly to assume a lap condition before full service brake pressure is achieved. The arrangement has no adverse effect when the control valve device is operated in a graduated release mode.

REFERENCES:
patent: 3429620 (1969-02-01), Scott
patent: 4025126 (1977-05-01), Wilson
patent: 4033632 (1977-07-01), Wilson
patent: 4125292 (1978-11-01), Worbois et al.

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