· Indeed, combined by two different diameter pumps
· Uses the hydraulic feedback theory, reduce the broken off of sucker rod
· Long service life
· Very good anti-corrosion property
RELATED STORIES
· Adopt long plunger and short barrel structure · Use the sand scraping and sealing...
· Unique outside work barrel and plunger rotator · Valve ball has a compulsive restoration...
· The pump reaches the advanced level in the world · Has good anti-corrosion performance...