Stabilized brake control valve

Details Stabilized brake control valve Stabilized brake control valve

2007-10-23

2008-09-30

Schwartz, Christopher P (Department: 3683)

Fluid-pressure and analogous brake systems

Automatic

Supplementary reservoir pipe

C303S036000, C303S039000

Reexamination Certificate

active

07429088

ABSTRACT:
A brake control valve includes a housing, a quick braking chamber and a piston subject to brake pipe pressure on one side of the piston. A bore in the housing connects the quick braking chamber via a first port at a first end and the one side of the piston at a second end. The bore has a first portion of a first diameter and a second portion of a second diameter larger than the first diameter. The first bore portion connects the one side of the piston to the second bore portion. A first operator in the bore is connected to the piston. A seal on the first operator is dimensioned to form a seal with the first bore portion and not with the second bore portion. The seal is located on the operator to lie in the first bore portion for a first segment of the range of piston positions and to lie in the second bore portion for a second segment of the range of piston positions.

REFERENCES:
patent: 4558907 (1985-12-01), Reiss et al.
patent: 4786117 (1988-11-01), Hart
patent: 5358315 (1994-10-01), Balukin
patent: 5387030 (1995-02-01), Gayfer et al.
patent: 5429426 (1995-07-01), Hart
patent: 5564794 (1996-10-01), Hart
patent: 5941280 (1999-08-01), Hart et al.
patent: 6318812 (2001-11-01), Newton et al.

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