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

流体泵的一种类型。它的往复运动的活塞或柱塞驱替流体。

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

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。

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This pump impeller blades can be adjusted automatically to adapt to speed, fluid viscosity and pressure.

这种泵的叶轮叶片可以自动调节来适应转速、流体粘度和不同压力。

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When the officer confronted him, the man sprayed the air with fluid from a plastic pump bottle that he had inside his jacket.

CNN: Subway checked for hazardous material; none found

Today, the company has a patent-pending solution that conceals the pump, the fluid and the tubes so that they can all be easily worn (and concealed) under clothing.

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E-Steer which eliminates the need for the traditional power-steering system's hydraulic pump, hoses, fluid and belts.

ECONOMIST: MONITOR