Fluid handling – Systems – Sequentially progressive opening or closing of plural valves
Patent
1987-03-13
1989-01-10
Schwadron, Martin P.
Fluid handling
Systems
Sequentially progressive opening or closing of plural valves
1375961, 251282, B60T 1312
Patent
active
047966670
ABSTRACT:
The invention relates to a brake pressure control valve which contains a brake pressure build-up valve. The brake pressure build-up valve comprises a pressure compensated seat valve. A second valve member, a rod between the two valve members and a tubular compensating piston are provided to produce pressure compensation at the valve member. The compensating piston which encloses the rod is displaceable relative to the latter and comprises a second valve seat at its end directed towards the second valve member. A sealing ring also encloses the tubular compensating piston. When the first valve member is raised from its valve seat, the second valve member can precede the tubular compensating piston, thereby preventing friction forces between this compensating piston and its sealing ring from being disruptive during opening of the seat valve. Also provided is a valve slide which only uncovers flow bores when the seat valve is opened for the purpose of increasing brake pressure. Brake pressures can be smoothly controlled by means of the control slide.
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Kehl Georg
Schafer Ernst-Dieter
Greigg Edwin E.
Hepperle Stephen M.
Robert & Bosch GmbH
Schwadron Martin P.
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