Piston pump mainly by the piston in the pump cylinder for reciprocating motion to breathe and remove the liquid.

活塞泵主要由活塞在泵缸内作往复运动来吸入和排除液体。

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Reciprocating pump flow and pressure head has nothing to do with the pump cylinder size, and the reciprocating frequency of the piston stroke.

往复泵的流量与压头无关，与泵缸尺寸、活塞冲程及往复次数有关。

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Three mutual engagement of the screw in the pump cylinder for each lead of the formation of a sealed chamber, causing the seal between the suction mouth.

三根互相啮合的螺杆，在泵缸内按每个导程形成为一个密封腔，造成吸排口之间的密封。

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They contain a battery-powered pump and bladder, allowing the cylinder to control its buoyancy.

BBC: Cyber-sailors to survey oceans

So the city, in 1867, sank an immense cylinder, or crib, 2 miles from shore to pump fresh water back to the inhabitants.

FORBES: A most unromantic river