The pumping unit is the mechanism that converts the rotary motion of the prime mover into the reciprocating vertical movement required at the polished rod. Most types of pumping units utilize a walking beam, inherited from the days of the cable-tool drilling rigs. Beam-type sucker rod pumping units are basically a four-bar mechanical linkage, the main elements of which are:

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China Sucker Rod Pumps, Downhole Motor, Oil Production Equipment Suppliers, Manufacturers, Factory - KPT

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