Patent ID: 7270149

Claim:
A rotary valve assembly comprising: a valve body including a cylindrical or polygonal column valve seat, a bore defined longitudinally through a center of the valve seat, seat seals being provided on both ends of the valve seat, a plurality of valve oil passages and a main oil passage being respectively distributed radially around the bore, each valve oil passage including an inlet channel and an outlet channel for oil in or out, the main oil passage including a first orifice and a second orifice for communicating with bi-directional oil supply; a rotor defining center holes in a center thereof and respectively proximate ends thereof, annular grooves being defined in an outer peripheral of the rotor and respectively corresponding to the first orifice and the second orifice, at least a leading hole being defined at bottoms of the annular grooves and communicates with the center holes, guiding holes being defined in the rotor for respectively communicating the inlet channel and the outlet channel of the valve oil passages with the bore, at least a connecting element being provided on an end of the rotor for external operation; and a plurality of guidance check valves mounted in the valve oil passages, wherein the rotor is movably received in the bore of the valve body, with ends of the rotor being accommodated in the seat seals, disengagement prevention elements are respectively mounted on outward sides of the seat seals.