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.
双变径轮式抽油机是在继承常规游梁式抽油机优点的基础上设计而成的大载荷、长冲程、低冲次节能型抽油机。
A dual variable-diameter wheel pumping unit, which has long stroke and low pumping speed and large load capacity, is designed based on conventional beam pumping units.
该电磁阀可进行连续工作。该222 C阀还有一个短冲程水活塞用于作出快速反应和有自我清洁功能的双引导区域。
The valve is rated for continuous duty. 222c Valves have a short stroke water piston for fast response and dual guide areas have self-cleaning action.
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