双头螺杆泵比单头螺杆泵工作腔室多，泄漏少，泵的排量大，效率高。
The twin screw pump is of the properties of less leakage, big displacement and effectivity.
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。
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.
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