ROTARY CHECK VALVE Russian patent published in 2003 - IPC

FIELD: mechanical engineering; compressor stations of gas mains. SUBSTANCE: proposed rotary check valve has housing with inlet and outlet branch pipes. Rotary valve plate and hydraulic rotary damper are arranged on valve shaft in through channel of housing. Two fixed partitions are arranged in damper housing and two turnable blades are secured on its shaft. Working spaces of damper are formed by separating partitions and placed in communication through adjustable restrictive device. Shaft of damper is connected with shaft of valve. Additional chamber is provided in damper. Lower point of chamber is arranged above upper generatrix of inner diameter of damper housing and it communicates separately with both working spaces of damper through calibrated holes. Upper point of additional chamber is connected by pipeline with outlet branch pipe of valve housing. Self-cleaning filtering element is installed in through channel of pipeline. Invention provides protection of slot clearances of damper from clogging with hard impurities contained in gas. EFFECT: improved reliability and increased service life of rotary check valves with hydraulic rotary damper. 2 dwg