The conventional pumping unit is a modern version of the beam pumping unit first built in with the invention of crank counterbalance. It is a rear mounted class 1 lever system with crank counterbalance. Typically, if one were to drop a plumb line off the equalizer bearing that line would fall over the center of the crankshaft. It is manufactured in a wide variety of sizes and it can be fitted with many types of prime-mover bases that attach to the normal unit base. This is the most common pumping unit type, because of its relative simplicity of operation, low maintenance requirements and adaptability to a wide range of field applications. As the cranks on a conventional unit rotate, the pitman side members cause the walking beam to pivot on a center bearing, moving the polished rod.
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The beam pumping unit has been a mainstay in providing a reliable artificial lift solution for the oil and gas industry. Liberty Lift is a manufacturer and supplier of beam pumping units and brings a management team with decades of artificial lift experience, including the design and engineering of many competitive products used today. There are several specific ways that Liberty Lift distinguishes itself from competition. Its manufacturing procedures, exceeding API Q1 standards, are comprehensive.