... increasing stroke length of the plunger. The stroke length of the previously designed installations ranges from one to hundreds of meters. Based on the conducted experiments, the optimal acceptable stroke length has been determined for the developed Long Stroke Deep Well Pumping Unit DGNU-2-2.5. where the traction element for the string of rods is a round-link chain, which is attached to a chainwheel performing bidirectional rotation. The designed equipment provides the following: smooth adjustment ...

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