Auxiliary stabilizer valve for VX vent valve

Details Auxiliary stabilizer valve for VX vent valve Auxiliary stabilizer valve for VX vent valve

1993-05-10

1994-09-27

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Releasing

Control pipe

303 33, 303 57, 303 68, 303 86, B60T 1134, B60T 1544

Patent

active

053502221

ABSTRACT:
A railway car vent valve device having a nullifier valve that is selectively operable to disable the vent valve device during a single car test procedure in which the service stability of the car control valve is checked. The nullifier valve is automatically reset when the car brake pipe pressure drops below a predetermined value, such as occurs when the single car test apparatus is disconnected from the car brake pipe following completion of the single car test procedure.

REFERENCES:
patent: 4974911 (1990-12-01), Hart
patent: 5207482 (1993-05-01), Hart et al.

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