The driver moves the piston inside the cylinder, alternately pulling in and pushing out the process fluid (Fig. ).

原动机驱动在汽缸内的活塞，交替地吸入和排出工艺流体（图）。

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Flow into the cylinder can be directed to either end, producing either a pushing or pulling force at the piston rod end.

可以控制油液流如液压缸的其中一端，在活塞杆上产生一个拉力或产生一个推力。

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Flow into the cylinder can be directed to either end, producing either a pushing or pulling force at the piston rod end.

可以控制油液流如液压缸的其中一端，在活塞杆上产生一个拉力或产生一个推力。

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