Mar.25.2025
This passage provides a step-by-step guide on how to replace the pneumatic cylinder seal in a pneumatic system. The process involves shutting off the compressed air, disconnecting components, and disassembling the cylinder carefully. It details inspections for corrosion and wear on the cylinder components, recommending appropriate actions such as sandpaper polishing and lubrication. This article comes with videos of factory replacement seals.
Step 1. Close the compressed air main valve of the faulty pneumatic valve, and disconnect the compressed air connection pipe from the solenoid valve to the cylinder. Loosen the cylinder tightening bolts, gently tap the cylinder end cap with a purple copper rod, and remove the cylinder end cap (which contains the seal).
Step 2. Rotate the manual operating lever on the other side of the pneumatic head with a manual rod, slowly open the pneumatic valve, allowing the cylinder piston to move to one end of the cylinder seat. Gently tap the cylinder barrel (to prevent deformation), and remove the barrel.
Step 3. Check if the inner wall of the cylinder barrel is corroded. If the corrosion is not severe, use metallographic sandpaper to polish the rust spots on the inner wall of the cylinder barrel. After smoothing, apply rust-proof oil. If the corrosion is severe, the cylinder barrel must be replaced. Check the seals in various locations and replace the aged and worn-out seals. After installing the seals on various components, lubricate the surface with Vaseline for easy installation.
Step 4. Check if the piston rod is worn or corroded. If corrosion and wear are not severe, use metallographic sandpaper to polish the rust spots on the piston rod. After smoothing, apply rust-proof oil. If the corrosion is severe, the piston rod must be replaced. Then check the rotating mechanism for wear and ensure good lubrication (add grease).
Step 5. Reassembly: Align the exhaust hole on the cylinder seat with the exhaust hole on the valve body, install it on the pneumatic head valve body, then gradually install the cylinder, cylinder end cap, tighten the cylinder tightening bolts, and install the compressed air pipe from the solenoid valve to the cylinder. Finally, rotate the manual operating lever, slowly close the pneumatic valve, allowing the cylinder piston to return to one end of the cylinder end cap. After the inspection is complete, open the compressed air main valve, conduct a pneumatic valve switch test, ensure smooth and unhindered operation, and no air leakage in the cylinder. Restore the system.
