流体泵的一种类型。它的往复运动的活塞或柱塞驱替流体。

A type of fluid pump in which reciprocating pistons or plungers displace the fluid.

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而膨胀式封隔器的膨胀则是通过泵送流体进入囊状物，与气球大约同样的方式，但是比气球具有更坚固的结构。

The expansion of the latter is accomplished by pumping a fluid into a bladder, in much the same fashion as a balloon, but having more robust construction.

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对于粘度或密度在工艺中有变化的流体，这种泵不会受到太多影响。

For the viscosity or density change in the process fluid, the pump will not be affected too much.

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