Patent ID: 7174881

Claim:
A hydraulic system comprising: a source of high pressure fluid and a low pressure reservoir; an actuator control valve including a valve body defining a high pressure passage fluidly connected to said source of high pressure fluid, a low pressure passage fluidly connected to said low pressure reservoir and a device control passage; said actuator control valve being movable between a first position in which said device control passage is open to said low pressure passage, and a second position in which said device control passage is open to said high pressure passage; said device control passage being fluidly connected to a first hydraulic device and a second hydraulic device; said first hydraulic device is a fuel injector; said second hydraulic device is an engine compression release brake; said first hydraulic device includes a direct control needle valve having a closing hydraulic surface exposed to fluid pressure in a pressure communication passage; and an electrically controlled needle control valve operable to raise and lower pressure in said pressure communication passage.