FIELD: engines and pumps.
SUBSTANCE: invention relates to pumping unit and can be used for extraction of high-viscosity fluids from wells. Proposed pump comprises smaller-diametre upper cylinder furnished with lock. Lower cylinder communicates with pipe string via branch pipe and lock support. Upper plunger coupled with pipe string comprises spring-loaded ball valve and is coupled, via rod, with plate-type lower valve shut-off element. Seat of said lower valve is arranged on lower plunger that moves relative to rod through distance equal to shut-off element travel.
EFFECT: increased factor of pump filling.
1 dwg
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