Freight brake emergency valve

Details Freight brake emergency valve Freight brake emergency valve

1989-01-13

1989-07-25

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Automatic

Equalizing valves

303 37, 303 82, B60T 1134, B60T 1530, B60T 1704

Patent

active

048506540

ABSTRACT:
An improved freight brake emergency valve device providing improved stability against undesired emergency brake applications without degradation of emergency sensitivity. This is achieved, in one aspect of the invention, by introducing a spring force on the emergency piston as the piston approaches emergency position to thereby retard the piston momentum suffiently to allow a random brake pipe pressure fluctuation to dissipate. In another aspect of the invention, a choke and check valve are arranged to create a dashpot effect to retard piston momentum resulting from a random brake pipe pressure fluctuation.

REFERENCES:
patent: 2939746 (1960-06-01), Pickert
patent: 4690463 (1987-09-01), Hart
patent: 4744609 (1988-05-01), Weber, Jr.
patent: 4770472 (1988-09-01), Weber, Jr. et al.
"AB" Single Capacity Freight Car Air Brake Equipment with the ABD Control Valve, published Sep. 1979.
"AB" Single Capacity Freight Car Air Brake Equipment with the ABDW Control Valve, published Nov. 1980.

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