FIELD: oil production equipment, namely for lifting gas-liquid mixture out of wells provided with insert and non-insert rod pump apparatuses. SUBSTANCE: pump has plunger whose length is more than its stroke value. Cylinder has lateral windows that may engage with plunger and are arranged between pumping and suction valves at side of pumping valve in position spaced from suction valve. EFFECT: simplified structure, enhanced reliability, increased useful life of installation. 7 cl, 4 dwg
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