PLUNGER FOR SUCKER-ROD PUMP

摘要

FIELD: hydraulic mechanical engineering.;SUBSTANCE: plunger comprises load-bearing rod and conical bushings provided with conical faces and mounted on the load-bearing rod for permitting axial movement. The conical faces form grooves diverging toward the load-bearing rod, and the spacer and sealing rings are made in block from the flexible ring having trapezoidal cross-section.;EFFECT: simplified structure.;3 dwg