FIELD: oil producing industry. SUBSTANCE: device is designed for use in hydraulic machine engineering, particularly, in well diaphragm pumps. Proposed pump contains housing, bushing with diaphragms fitted in seats of bushing and made in form of sector cylinders and consisting of carrying and sealing members. With pump operating, its eccentric shaft acts onto eccentric bushing which acts onto pressure bearings and the latter act onto knockout device which compresses the diaphragms. Carrying members are not subjected to deformation on end face surfaces, i.e. they operate as piston. Sealing members are subjected to deformation which sharply increases operation reliability of device. As carrying and sealing members of diaphragms are made in form of solids of revolution, labor input at their manufacture and at manufacture of device as a whole is considerably reduced. EFFECT: reduced labor input at manufacture. 7 dwg
