还综述了柱塞冲程、速度和加速度的计算，为特种抽油泵结构和工作参数的正确选择提供了依据。

The calculations for the stroke, speed and acceleration of the plunger are summarized, providing a basis for selecting the structure and working parameters of the pump.

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采用固定冲程的柱塞泵，省去复杂的机械冲程调节装置，使柱塞直接推动膜片工作。

Adopting piston pump with fixed stroke, the piston directly propels the diaphragm, thus deleting the complex mechanic stroke adjustment equipment.

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柱塞的长度总大于它的冲程，并只有柱塞的一个端面为液体增压。双作用柱塞泵至少需要两个缸体和柱塞。

A plunger is always longer than its stroke and only one end is available for pumping. Double-acting plunger pumps require at least two cylinders and plungers.

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