Spring Return Cylinders is a cylinder in which a spring returns the piston assembly. These are components of single rod type with pressure to activate the work stroke. The spring in the nonpressurized end returns the piston to its original position when pressure is released. The cylinder must be about twice as long as the required stroke to include space for the spring. They are spring loaded in the opposite direction, so they extend with spring action and retract pneumatically or hydraulically.