| 摘要 |
A positive displacement pump includes a cylindrical housing which is divided in half by a partition. Each end of the housing lies proximate to an end plate to define peripheral inlet openings into each of said halves. Axial outlets and pistons are also provided for each half of the chamber. By including a mechanism for driving the pistons in unison and opening and closing the peripheral inlets and axial outlets in a particular order, pumping action can be achieved. The pump disclosed is particularly useful from down hole oil pumping applications.
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