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The pneumatic cylinder barrel needs independent intake and exhaust paths in both directions. Without ports, compressed air cannot enter or exit, and the pneumatic cylinder barrel cannot perform any action.

When the pneumatic cylinder barrel cannot stably, continuously, and controllably complete piston movement under design conditions, it should be considered damaged or close to damage.

The biggest advantage of a double-acting pneumatic cylinder lies in its bidirectionally controlled operation. From an engineering perspective, double-acting pneumatic cylinder barrels are more conducive to achieving stable and repeatable motion.

A double-acting pneumatic cylinder barrel refers to a pneumatic structure where both the extension and retraction of the piston are driven by compressed air. That is, the reciprocating motion of the piston is entirely controlled by air pressure, not relying on a spring or external force.

The three basic types—single-acting, double-acting, and telescopic cylinders—correspond to three distinct types of pneumatic cylinder barrels with significant differences in structural complexity, force application, and sealing requirements.

If the inner wall of the pneumatic cylinder barrel only has slight, uniform wear, without significant scoring or grooves, and the roundness is still within the allowable range, basic performance may be restored through appropriate inner wall treatment.