FIELD: oil production. SUBSTANCE: inlet hole of cylinder has a suction valve. The cylinder accommodates reciprocating plunger forming a working chamber and has a radial hole for communication with well annulus by a channel with return valve disposed above inlet hole and capable of opening into channel. The cylinder has additional radial holes spaced along cylinder-generatrix in the plunger travel zone. Said holes communicate with the channel. EFFECT: improved design. 1 dwg
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