Emergency portion for a brake control valve

Details Emergency portion for a brake control valve Emergency portion for a brake control valve

1977-01-10

1977-08-23

Reger, Duane A.

Fluid-pressure and analogous brake systems

Automatic

Synchronizing

303 42, 303 81, B60T 1530

Patent

active

040436055

ABSTRACT:
An inexpensive emergency valve device embodies a first movable abutment, subject on its respective opposite sides to the pressures in a brake pipe and a quick action chamber, that, upon a service rate of reduction of brake pipe pressure, unseats a poppet valve from one of two valve seats between which it is disposed so that, while unseated from both valve seats, fluid can flow at a service rate from the quick action chamber, one side of the first abutment and both sides of a second abutment, operatively connected to a combined emergency and brake pipe vent valve to atmosphere so long as brake pipe pressure is reduced at a service rate thereby preventing an emergency brake application. Upon an emergency rate of reduction of brake pipe pressure, the quick action chamber pressure acting on the one side of the first abutment shifts the poppet valve into seating engagement with the other valve seat to cut off flow from the quick action chamber and one side of the second abutment to atmosphere whereupon the pressure of the trapped fluid under pressure on the one side of the second abutment deflects it to unseat the brake pipe vent valve to cause an emergency brake application.

REFERENCES:
patent: 2031213 (1936-02-01), Farmer
patent: 3232678 (1966-02-01), Wilson

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