Single acting spring return cylinder
What is a single acting spring return cylinder?
A single acting cylinder is a cylinder in which the working fluid acts on only one side of the piston. The other side of the cylinder utilizes a mechanical rod, spring, compressed air or the momentum of a fly wheel to push the piston back in the other direction. This particular cylinder utilizes a spring on the non-fluid side. this spring retracts in the pull direction.
When the control valve directs fluid out of the port, the fluid pressure is removed. The force of the spring pushes against the piston in the other direction and the rod returns to the cylinder. This is called the retraction stroke. Single acting cylinders are most often found in reciprocating engines, pumps etc.