DOWNHOLE ROD PUMP Russian patent published in 1996 - IPC

FIELD: oil industry. SUBSTANCE: installed in body 1 with possibility for axial displacement is plunger 4 with delivery valve 5 connected with movable rod 3. Located in lower part of body is inlet valve 3 and shank 7 with inlet valve 9. Cylindrical recess 11 is made in horizontal surface of shank 7 which is closed at two sides by plugs. Seated in recess 11 is axle 16, and rotatably mounted on it is single-way shut-off 18 of side bores 12 tangentially directed toward middle part of cylindrical recess 11. Also provided are longitudinal vertical tangential inlet bore 13 and outlet bore 14 in opposite side from axial line of shank 7 of recess 11. Area of end face of shut-off 18 is equal to or larger than cross-sectional area of tangential side hole 12 and inlet tangential bore 13 and less than cross-sectional area of outlet tangential bore 14. Body 1 and shank 7 are seated in housing 20. They are fixed and sealed by upper end face stop 24 with seal 25 of body 1, and lower end face stop 26 with seals 27 and stop member 28 of shank 7. EFFECT: high efficiency.