Emergency valve for ABD freight brake control valve device

Details Emergency valve for ABD freight brake control valve device Emergency valve for ABD freight brake control valve device

1991-01-22

1991-12-10

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Automatic

Synchronizing

303 33, 303 38, 303 41, 303 82, B60T 1530

Patent

active

050711989

ABSTRACT:
An improved freight brake emergency valve device having improved stability against undesired emergency brake applications, without loss of emergency sensitivity. Flow regulator in the form of a valve and choke combination or a choke itself is employed between the quick action chamber and the chamber normally subject to quick action chamber pressure on the side of the emergency piston opposite brake pipe pressure. This has the effect of momentarily reducing the volume of quick action chamber pressure in order to achieve an intensified pressure reduction in response to initial deflection of the piston member sufficient to counteract a momentary, spurious brake pipe pressure fluctuation.

REFERENCES:
patent: 4690463 (1987-09-01), Hart
patent: 4830438 (1989-05-01), Hart et al.
patent: 4850654 (1989-07-01), Hart et al.

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