VALVE FOR CONTROL OF FLOW RATE OF HOT GAS Russian patent published in 1998 - IPC

FIELD: mechanical engineering; valves operating at high temperatures, up to 2300 K and pressures up to 10 MPa in gas medium; control of thrust vector of flying vehicles. SUBSTANCE: valve has body with inlet and outlet branch pipes which is protected internally with heat shield, seat with supply opening fitted in outlet branch pipe and engageable with cylindrical regulating member connected with shaft which is coaxial relative to cylindrical surface of regulating member; shaft is sealed up by means of seal. Heat shield of body has circular cavity on side directed towards output end of shaft. This circular cavity has three rings whose end faces are directed towards one another. End rings are engageable with lateral surface of circular cavity and are located at circular clearance relative to outer surface of shaft. Center ring is engageable with outer surface of shaft by its inner surface. Center ring is mounted at circular clearance relative to lateral surface of circular cavity. Rings are fitted in circular cavity at axial play. EFFECT: enhanced operational reliability of valve. 3 cl, 3 dwg