Abstract: A valve has a body containing three ports, and a rotor is rotatable in the body, the rotor rotatable about an axis to bring two passages in the rotor selectively into and out of registration with the body ports, the body ports opening at a cylindrical bore in the body, and the rotor passages opening at a cylindrical periphery of the rotor, the rotor passages spaced about said axis. The valve also includes:(a) axially spaced seal rings extending about the axis between the rotor and the body, the rings spaced at axially opposite sides of the passages and ports,(b) at least three seal strands extending between the rings and integral therewith, with first and second strands spaced apart about the axis at angularly opposite sides of one of the rotor passages, and the second strand and a third strand spaced apart about the axis at angularly opposite sides of the second of the rotor passages.