Abstract: The present invention is directed to a valve having a plug with a pair of passages therethrough and a housing with ports which communicate with the passages of the plug in at least two orientations to form flow paths through the valve. The valve includes a space located at the interface of the plug and housing which, when pressurized, assures that fluid leakage between the flow paths of the valve is prevented in either the first or second orientation of the valve. In the preferred embodiment of the valve the space is defined by first and second endless paths which are orthogonal to each other and intersect at the poles of the axis of rotation of the plug. Seal members may be disposed along each endless path to further assure the integrity of established flow paths through the valve.