PLUNGER OF SUCKER-ROD PUMP

摘要

A plunger of sucker-rod pump includes a body with reboring on the outer surface to which working bushings and rings are installed, between the working bushings of the cylinder dirt-collection rings are installed, those are installed at the reboring by slide fit, and the control ring is installed in such way that tightened up to stop of the reboring body of the ram provides rotation of working bushings.