The working principle of a new kind of double-acting hand piston pump having two-step output pressure was introduced. The displacement and the output pressure calculating formulae were given.

介绍了一种新型手动双作用双级柱塞泵的工作原理，给出了其排量与输出压力的计算公式。

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The system consists of two (2) separate "bottle" jack cylinder with integrated manual hand pump.

包括2套瓶式千斤顶并附带手动油泵。

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Everything is joined by a unique, hand-cut case whose backbone and elevated base hide the custom wiring, the watercooling pump, two solid-state drives and controllers for both fans and lighting.

ENGADGET: Project Inverted turns a gaming PC inside-out with hand-made casing