FIELD: power engineering, transport, mechanical engineering; pumps, compressors, hydraulic motors. SUBSTANCE: blades 4, 5 of rotor 3 rotate in annular channel 2 of case 1 and displace working medium from admission port 9 to outlet one 10. Blades are shaped so that they follow section of annular channel and are joined to rotor through slit 8 made in annular channel. To prevent working medium flow between ports, relief valve 6 is provided; it is shaped as cylinder with side space through which blades move. Relief valve is kinematically linked with rotor in proportion 2:1. EFFECT: simplified design; enlarged functional capabilities. 2 cl, 11 dwg
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