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Cylinder, Double Rod

A hydro mechanical device, usually a cylindrical chamber, with movable shafts at the both ends. When fluid flow is applied to a port in either end, the shaft extends until the collar or piston reaches the shaft end.
When fluid is applied to the other port, the shaft will retract into the chamber until the piston or collar reaches the opposite end.
The cylinder will produce an output force at the shaft end in proportion to its internal area multiplied times the pressure potential of the fluid power system.