Freight brake control valve having lap leakage protection

Details Freight brake control valve having lap leakage protection Freight brake control valve having lap leakage protection

1990-08-29

1991-09-03

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Automatic

Equalizing valves

303 35, 303 38, 303 41, B60T 1542, B60T 1704

Patent

active

050446983

ABSTRACT:
A service valve piston assembly for a freight brake control valve device in which the graduating valve is configured to cooperate with the associated slide valve to close off the application port via which auxiliary reservoir pressure acting on one side of the piston assembly feeds the brake cylinder prior to opening of the stability port via which the brake pipe pressure on the opposite side of the piston assembly is communicated with auxiliary reservoir pressure on the one side of the piston, thereby preventing the piston valve assembly from finding a quasi-lap position in which the brake cylinder continues to be pressurized.

REFERENCES:
patent: 2032145 (1936-02-01), Nelson
patent: 2055967 (1936-09-01), Campbell
patent: 4776642 (1988-10-01), Hart et al.
patent: 4974910 (1990-12-01), Hart

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