It is used in double pumps and circuits high pressure variable system on model JY320 hydraulic excavator.

用于JY320型液压挖掘机等的双泵双回路高压变量系统。

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Meanwhile, this thesis introduces application of the new circuit in typical hydraulic system of double pumps.

并以典型双泵供油液压系统为例，介绍新回路的应用。

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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.

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。

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Its first action was to challenge oil companies to double the number of renewable fuel pumps at their stations within the year and pledge to offer E85 ethanol fuel at half of all gas stations within the decade.

CNN: Redford: Kicking the oil habit