FIELD: oil and gas recovery; manufacture of oil-well pumps. SUBSTANCE: vortex mixing chamber of oil-well pump has closed bottom; upper part of vortex chamber is provided with tangential active nozzle; passage supplying medium being handled is coaxial relative to vortex chamber and is brought in communication with it and with tangential outlet passages; supply passage is provide with check valve having taper seat. EFFECT: enhanced reliability. 3 dwg
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