(1) the plunger hydraulic cylinder is a single acting hydraulic cylinder, and only one direction can be achieved by hydraulic pressure. The return stroke depends on other external forces or the self weight of the plunger.
(2) the plunger is only supported by the cylinder sleeve without contact with the cylinder sleeve, so the cylinder sleeve is very easy to be machined, so it is suitable to be a long stroke hydraulic cylinder.
(3) the plunger is always pressed at work, so it must have enough stiffness.
(4) the weight of the plunger is often larger and the horizontal placement is easy to droop because of its self weight. It causes the wear of the seal and the direction of the single side, so it is more favorable for its vertical use.