A valve actuator assembly for an engine includes a movable engine valve, a movable spool valve and four on/off valves. An intermediate channel interconnects the spool valve and first and second on/off valves. A driving channel connects the spool valve and a first fluid chamber for driving the engine valve. First and second feedback channels communicate between the second and third fluid chambers and fourth and fifth fluid chambers of the spool valve. Third and fourth on/off valves enable and disable the feedback channels to improve valve controllability.

 
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