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.
供输送清水或物理化学性质类似于清水的其它液体进行增压之用。
It is used to handle clean water or other liquids similar to water in physical and chemical properties.
液体燃料增压泵撬装体。
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