FIELD: manufacture of pumps. SUBSTANCE: gear pump has internal engagement without intermediate body; hollow impeller is mounted in race forming circular slot; impeller rotates together with race. Circular slot is divided into mutually sealed peripheral zones which are separated by means of sealing members inserted in cavities where they move circumferentially sealing-up the cavities relative to each other. EFFECT: simplified construction. 9 cl, 14 dwg
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