Dual-response vent valve device

Details Dual-response vent valve device Dual-response vent valve device

1991-02-08

1992-03-17

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Releasing

Control pipe

137494, 303 69, 303 86, B60T 1704

Patent

active

050962663

ABSTRACT:
A brake control system having a vent valve device in which a control piston is effective to unseat a normally closed vent valve to provide rapid exhaust of brake pipe pressure to either propagate an emergency brake application in response to brake pipe pressure on one side of the piston being reduced at an emergency rate or to initiate an emergency brake application when pressure on the opposite side of the piston is increased by an auxiliary pilot valve connected to a second main reservoir at a higher pressure.

REFERENCES:
patent: 3165115 (1965-01-01), Erson
patent: 3570529 (1971-03-01), Pickert
patent: 4974911 (1990-12-01), Hart

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