Abstract: A regulator for an internal combustion engine having at least one working cylinder space is disclosed. The regulator comprises a housing for connection to the engine and a rotary slide valve rotatably mounted in the housing to rotate on a rotation axis. The rotary slide valve has at least one passageway for alternatively connecting the cylinder working space with intake and discharge channels in the housing as the valve is rotated in the housing. Cooling means are also provided for cooling the rotary slide valve. The cooling means includes a coolant fluid inlet in the valve into which coolant fluid is introduced at a first radial position with respect to the rotation axis, and first and second cooling channel portions for conducting the coolant fluid through the rotary slide valve.

Abstract: A cycling valve for an internal combustion engine comprises a valve housing on top of the engine block and a circular rotary valve body within the housing geared to the crank shaft of the engine. Air of sub-atmospheric pressure developed in the engine crankcase is drawn through a system of cooling passages in the valve body and through an additional system of cooling passages in the base of the valve housing.