A hydraulic valve control device for internal combustion engines having a magnetic valve for controlling the opening and closing time of an inlet or outlet valve in which the fluid pressed out of the stroke transmission chamber by the engine valve springs is stored in a reservoir chamber integrated with the magnetic valve; the reservoir chamber, by displacing the valve member backward, functions as a reservoir piston in the opening direction. A spring acting upon the valve member in the closing direction of the magnetic valve presses the fluid back into the stroke transmission chamber, which now is expanding one again. The magnetic valve communicates with the stroke transmission chamber through the shortest possible fluid conduit.