Switchable fluid control valve system

Details Switchable fluid control valve system Switchable fluid control valve system

2005-06-14

2005-06-14

Michalsky, Gerald A. (Department: 3753)

Fluid handling

Systems

Multi-way valve unit

Reexamination Certificate

active

06904937

ABSTRACT:
A switchable fluid control valve assembly having a regulating spool and a pilot spool disposed within a common bore. A regulating spring urges the regulating spool toward a rest position wherein an oil supply port is fully uncovered. Supply oil entering the assembly causes the regulating spool to assume a position wherein oil flow is throttled to a downstream pressure insufficient to activate an associated valve deactivation mechanism but sufficient to provide lubrication to the engine. When activation of the mechanism is desired, a solenoid moves the pilot spool wherein oil at full pressure is engaged against the regulating spool, de-throttling the flow of oil to the mechanism. When the solenoid is again deactivated, a dump port is opened into the oil flow path, immediately reducing the pressure on the regulating spool which then moves to eclipse the supply port and open a path from the mechanism to drain.

REFERENCES:
patent: 4321941 (1982-03-01), Hunschede et al.
patent: 5174338 (1992-12-01), Yokota et al.
patent: 5261455 (1993-11-01), Takahashi et al.
patent: 5343994 (1994-09-01), Kyrtsos
patent: 6408883 (2002-06-01), Motoki et al.

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