Multiple-circuit valve apparatus

Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves

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Details

91448, 91510, 91532, 91516, F15B 1108, F15B 1304

Patent

active

048175013

ABSTRACT:
A bidirectional flow communication passageway is provided by the present invention in a multiple-circuit fluid pressure responsive system on a motor vehicle to allow a gradual reduction of pressure in a parking brake circuit which is a part of such system. The passageway is restricted to limit such bidirectional flow to a predetermined level. The pressure reduction permitted is sufficient to activate a parking brake valve in such parking brake circuit when a defect occurs in an operating service brake circuit which is also a part of such system.

REFERENCES:
patent: 4037617 (1977-07-01), Perales
patent: 4054327 (1977-10-01), Rebenstorf
patent: 4057298 (1977-11-01), Seegers

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