FIELD: engines and pumps.
SUBSTANCE: invention relates to pump engineering and can be used in borehole pumps designed to extract oil, water and other fluids from wells. Solid-state filler top end is secured to lifter while bottom end is secured to lower end of the rod reciprocating at filler up-and-down displacement.
EFFECT: higher head and efficiency at notable content of gas in borehole fluid.
3 dwg
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