1.API 11E pumping unit 2.Conventional beam unit 3.energy-efficient, long stroke, small dynamic load,high efficiency,stable ... for more than 15 years. Our main products include pumping unit, subsuface pump, wellhead, float collar & shoe, casing centralizer, ... long service life. Technical specification for B series pumping unit ItemPumping unit typeLifting Capacity(lbs)Stroke Length(in)Rated torque(in. ...