Patent ID: 6966338
Filing Date: 2005-11-22
Classification: F01L,F16K,Y10T

Abstract:
1. An electrohydraulic valve for a hydraulic system which controls operation of a cylinder valve of a multi-cylinder engine, the electrohydraulic valve comprising: a valve body having a bore into which open an inlet, an outlet and a workport, with a first valve seat formed in the bore between the inlet and the workport, and a second valve seat formed in the bore between the workport and the outlet; a first valve element movable in the bore in a mechanically unbiased manner and selectively engaging and disengaging the first valve seat to close communication between the inlet and workport, wherein when the multi-cylinder engine starts air in the hydraulic system is allowed to bleed from the inlet past the first valve seat regardless of whether the cylinder valve is active or de-active; and an actuator having an electromagnetic coil, an armature is slidably received in the electromagnetic coil, and a stem projecting from the armature to engage and move the first valve element within the bore.