PUMP UNIT Russian patent published in 2010 - IPC F04B47/00 

FIELD: engines and pumps.

SUBSTANCE: proposed pump unit comprises first cylinder with plunger and valve, lateral valve and filter, coupling, packer separating top bench from bottom bench, second cylinder with plunger and valve, lateral valve and filter, adapter on its end furnished with valve, filter and polished tail end tightly fitted in polished cylinder of the packer separating medium bench from bottom bench, rod rigidly coupling cylinder plungers, rod string and tubing string. Strings and rod are made hollow and communicated with bottom cylinder plunger chamber, while chamber above top cylinder plunger is communicated via delivery tube with check valve with the chamber above top cylinder plunger.

EFFECT: separate water lifting on to surface.

1 dwg