Plunger

(A) A plunger-type hydraulic cylinder is a single-acting hydraulic cylinder that can only achieve movement in one direction due to hydraulic pressure; the return stroke of the plunger relies on external force or the weight of the plunger itself.

(2) The piston is supported solely by the cylinder sleeve without contacting it, making the sleeve easy to machine, thus suitable for long-stroke hydraulic cylinders.

(3) The plunger is always under pressure during operation, therefore it must have sufficient rigidity.

(4) The plunger weight is often quite heavy, and when placed horizontally, it tends to sag due to its own weight.SealingsVertical usage is more beneficial due to its single-sided wear guidance.

Adjustable

Telescopic hydraulic cylinderHydraulic cylinders with two or more stages feature a piston extension sequence from large to small and a retraction sequence from small to large when unloaded. These telescopic cylinders can achieve longer stroke lengths but are shorter and more compact when retracted. Such cylinders are commonly used in construction and agricultural machinery. With multiple pistons moving in a single stroke, both the output speed and force vary as each piston sequentially moves.