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。
液体燃料增压泵撬装体。
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