The difference between single acting and double acting hydraulic cylinders

Do you know the difference between single-acting and double-acting hydraulic cylinders?
Single-acting oil cylinder means that the movement in one direction is realized by oil pressure, and the return is by external force such as self-weight or spring. Only one end of the two chambers of this oil cylinder has oil, and the other end is in contact with air. Double-acting cylinders have oil in both chambers, and movements in both directions are achieved by oil pressure.
So let's briefly understand the different structures and working principles of single-acting hydraulic cylinders and double-acting hydraulic cylinders！
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