Plural service rate sensitivity control valve

Details Plural service rate sensitivity control valve Plural service rate sensitivity control valve

1993-09-10

1995-02-07

Oberleitner, Robert J.

Fluid-pressure and analogous brake systems

Automatic

Supplementary reservoir pipe

303 39, 303900, B60T 1706

Patent

active

053870301

ABSTRACT:
A control valve having, in a series with a first inlet valve of a quick brake volume, two different rates of flow restrictions operable as a function of the position of the piston. The first flow rate of one first restriction is insufficient to cause the piston to a braking position for applying a minimum service application for first range of piston positions which would generally be produced by the mechanical vibration. The second restriction has a greater flow and will accelerate the piston to a braking position for a second range of piston positions which will be produced by the reduction of the brake pipe pressure on one face of the piston. By providing two flow rates, the valve becomes insensitive to mechanically produced forces while maintaining the reaction time of the valve to fluidically produced reduction of brake pipe pressure.

REFERENCES:
patent: 2077788 (1937-04-01), Goodknight
patent: 3545820 (1970-12-01), Scott
patent: 4536040 (1985-08-01), Eder
patent: 4848849 (1989-07-01), Epp et al.
patent: 4850654 (1989-07-01), Hart et al.

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