How does a 3 stage hydraulic cylinder work?

Anbao Hydraulic As a professional hydraulic cylinder manufacturer, 3 stage hydraulic cylinder is our common working mode.Typically, the stages of a telescopic cylinder extend from largest to smallest. The largest stage will complete its stroke before the next stage begins moving. This continues until all stages are fully extended and the cylinder has reached its overall extended length.

A common application for a multi-stage cylinder is the dump body on a dump truck. In order to empty a load completely, the dump body must be raised sometimes to an angle of 60 degrees. A single rod cylinder is not suitable here as the retracted length would need to be longer than the required stroke. A dump truck chassis cannot accommodate this collapsed length and a telescopic cylinder is the ideal solution.

A single/double acting telescopic cylinder is typically used when retract force is only required for a portion of the stroke. A typical application is a mast raising cylinder on a drilling rig, where the load is pulled over center and then gravity takes over to complete the retract cycle. By enabling a number of stages to remain single acting, the design maintains simplicity and reduces the overall cost.