FIELD: oil producing industry. SUBSTANCE: proposed pump is designed for use in oil and gas producing industry at recovery of crude oil from productive strata. Pump contains cylinder, plunger, sucker rod string connected with delivery valve, and suction valve. Cylinder is connected with suction valve pusher to displace valve in housing through value of suction valve stroke. Suction valve housing is stationary connected with tubing string. Invention improves reliability in operation and increases pump fill factor by preventing failures at closing and opening of suction and delivery valves. EFFECT: improved reliability in operation. 2 dwg
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