Mecha-hydraulic actuated inlet control valve

A method of fluid control comprising:

• blocking, by a stopper at a first end of a shaft of a valve, a fluid circuit between a fluid inlet to a fluid outlet, wherein the valve is at a first position;
• moving a plunger axially within a plunger cavity from a first plunger position toward a second plunger position, wherein the shaft is arranged within a shaft cavity defined within the plunger between an enclosed end and an open end;
• reducing, by movement of the plunger toward the second plunger position, fluid pressure of a fluid within the shaft cavity between the shaft and the plunger;
• urging, by the reduced fluid pressure, axial movement of the shaft within the shaft cavity from a first valve position toward a second valve position;
• and
• unblocking, by the stopper based on axial movement of the shaft, the fluid circuit.

An engine system comprising:

• a combustion chamber;
• a camshaft;
• a fuel rail;
• and
• a fluid control device comprising:
• a housing defining a fluid inlet in fluid communication with the fuel rail;
• a fluid outlet in fluid communication with the combustion chamber and the plunger cavity;
• a valve comprising:
• a shaft having a first end and a second end;
• and
• a stopper at the first end, configured to substantially block fluid flow from the fluid inlet to the fluid outlet in a first configuration of the inlet control valve and allow fluid flow from the fluid inlet to the fluid outlet in a second configuration of the inlet control valve;
• and
• a plunger configured to follow the camshaft and move axially within the plunger cavity, the plunger defining a shaft cavity having an inner wall extending from an enclosed end to an open end in fluid communication with the fluid outlet, and configured to accommodate axial movement of the shaft within the shaft cavity.