Abstract: The present seal (10) is a disc of a rigid but deformable plastic, the top surface of which is cylindrical, and the bottom of which has a circular groove (12) containing a flexible sealing mechanism (15). This seal is suited for use in a ganged rotor valve (22) having two or more levels of independent fluid passageways through the rotor along the length thereof. Each level will usually have two independent L-shaped passageways (34, 35). The seal (10) of this invention fits into the rotor about each of the ends of the passageways (34, 35) to seal the passageway between the rotor and the valve body (22).

Abstract: A rotor valve has a set of sealing members or inserts positioned in longitudinal channels formed on the outer surface of a cylindrical rotor. A resilient O-ring snuggly engaged in a groove in the rear surface of each insert urges it against a surrounding rotor chamber formed in a valve body. Due to the resilience of the O-ring, the fluid seal between the rotor and the rotor chamber does not bind due to contaminants or extreme variations in temperature. The sealing inserts are formed of a deformable material. Fluid pressure acting on the inserts deforms them to produce a lateral squeezing force on the O-ring. The interaction between the inserts and the O-ring enhances the integrity of both the seal between the inserts and the surrounding rotor chamber and the seal established by the O-ring itself between the rotor and the insert.