1. API Spec 11E pumping unit 2.Conventional beam pumping unit 3. simple, stable, convenient, long service life pumping unit characteristics: "H" section steel structure, high strength ... and crank pin bearing, reducing installationerrors and the vibration when pumping unit is operating.Hanging structure of the horsehead is “self-abdicating ... , 33, 2357,000C-57D-76-427,60042, 33, 2357,000 Pumping Unit