... stroke, small dynamic load,high efficiency,stable Specification of pumping unitOur company manufacture the oilwell pump in petroleum industry. ... oilfields for more than 15 years. Our main products include pumping unit, subsuface pump, wellhead, float collar & shoe, casing ... a long service life. Technical specification for B series pumping unit ItemPumping unit typeLifting Capacity(lbs)Stroke Length(in ...