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The pneumatic cylinder liner provides a stable trajectory for the piston. The piston reciprocates within the pneumatic cylinder liner, transmitting power to external devices via the piston rod. If the internal surface of the pneumatic cylinder liner is uneven or damaged, the stability of the piston's movement will be affected.

A sealing fit is formed between the pneumatic cylinder barrel and the seals. When scratches appear on the inner wall of the pneumatic cylinder barrel, the surface is no longer smooth, and the seals may not fit tightly when passing over the scratched area.

Generally, the radial clearance between the pneumatic cylinder barrel and the piston is typically in the range of 0.01mm to 0.05mm (depending on size grade), but the specific value must be determined in conjunction with design standards and operating conditions.

When purchasing pneumatic cylinder barrels, the following methods can be used to assess product quality: • Choose a manufacturer with mature production processes • Inspect the pneumatic cylinder barrel machining and testing equipment • Understand the quality control standards in the production process

From an engineering maintenance and mechanical structure safety perspective, although some minor problems can theoretically be repaired by machining, in most cases, a deformed pneumatic cylinder barrel is better suited for direct replacement than repair.

During long-term operation, pneumatic cylinder seal kits constantly come into contact with and rub against the cylinder wall and piston surface. If lubrication is insufficient or the surface roughness is high, the wear rate of the seals will accelerate. Ultimately leading to a drop in internal cylinder pressure.