Freight brake control valve having improved quick service functi

Details Freight brake control valve having improved quick service functi Freight brake control valve having improved quick service functi

1989-08-14

1990-12-04

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Automatic

Synchronizing

303 33, 303 35, 303 41, B60T 1542, B60T 1704

Patent

active

049749102

ABSTRACT:
A freight brake control valve device for a railway vehicle having a service piston slide valve arranged with a detent to latch the service piston in preliminary quick service position until such time as the application pressure differential acting on the piston exceeds a predetermined value.

REFERENCES:
patent: 1929576 (1933-10-01), Campbell
patent: 2050783 (1936-08-01), Campbell
patent: 2055967 (1936-09-01), Campbell
patent: 4188071 (1980-02-01), Hart
patent: 4776642 (1988-10-01), Hart et al.
patent: 4798420 (1989-02-01), Rojecki

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