Freight brake control valve for railway cars

Details Freight brake control valve for railway cars Freight brake control valve for railway cars

1991-12-09

1993-05-25

Oberleitner, Robert J.

Fluid-pressure and analogous brake systems

Automatic

Synchronizing

303 37, 303 33, B60T 1542, B60T 1704

Patent

active

052133974

ABSTRACT:
A piston valve assembly for a freight brake control valve device in which axial displacement of a piston member is provided relative to its slide valve in response to slide valve friction creating excessive resistance to movement of the piston assembly from lap to release position. This relative movement between the piston member and slide valve causes a graduating valve that is carried fast with the piston member to open a release insuring passage in the slide valve and thereby exhaust auxiliary reservoir pressure from one side of the piston member. Accordingly, a relatively high pressure differential is created across the piston member to quickly overcome the slide valve resistance and assure prompt movement of the piston valve assembly and thereby obtain brake release without delay.

REFERENCES:
patent: 2156720 (1939-05-01), Campbell
patent: 4773713 (1988-09-01), Rojecki
patent: 4848849 (1989-07-01), Epp et al.
patent: 4974910 (1990-12-01), Hart
patent: 5071198 (1991-12-01), Troiani

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