FIELD: handling pulps of medium consistency and liquids containing gas and solids. SUBSTANCE: method of control of operation of system of centrifugal pump whose impeller 14 and vacuum pump rotor 44 are mounted on common shaft 49 comes to discharge of gas separated from material being handled in centrifugal pump from this by means of vacuum pump through gas discharge passage 26 located between centrifugal and vacuum pumps; flow of gas between centrifugal and vacuum pumps is controlled in gas discharge passage 26 by means of control member limiting the gas flow which is mounted in gas discharge passage 26. EFFECT: possibility of creating required vacuum without sacrifice of reliability and discharge of required volume of gas from centrifugal pump due to control of gas flow in gas discharge passage 26 with no change in output of vacuum pump; increased productivity. 23 cl, 10 dwg
