How to maintain FESTO cylinder seals

How to maintain FESTO cylinder seals is not easy to be damaged?

The load increase and decrease of the FESTO cylinder is too fast, especially in the case of rapid start, stop and change of working conditions, the temperature change is large, the way of warming the cylinder is incorrect, the insulation layer is opened too early during shutdown, etc., and is generated in the cylinder and on the flange. Great thermal stress and thermal deformation.
FESTO cylinders generate stress during machining or after repair welding, but the cylinder is not tempered to eliminate the cylinder, resulting in large residual stress in the cylinder, resulting in permanent deformation during operation.
During the installation or overhaul of the FESTO cylinder, due to the maintenance process and maintenance technology, the expansion gap of the inner cylinder, the cylinder partition, the diaphragm sleeve and the steam envelope is not suitable, or the expansion gap of the hanger pressure plate is not suitable. After the operation, a large expansion force is generated to deform the cylinder.

The cylinder sealant used in FESTO cylinders is of poor quality, too many impurities or the wrong type; if there are hard impurity particles in the cylinder sealant, it will make the sealing surface difficult to tightly bond.

The FESTO cylinder bolt has insufficient tightening force or the bolt material is unqualified. The tightness of the cylinder joint surface is mainly achieved by the tightening force of the bolt. The thermal stress and high temperature generated when the unit starts or stops or increases or decreases the load will cause the stress relaxation of the bolt. If the stress is insufficient, the pre-tightening force of the bolt will gradually decrease. If the bolt material of the cylinder is not good, the bolt will be elongated under the action of thermal stress and cylinder expansion force during long-term operation, plastic deformation or fracture will occur, and the tightening force will be insufficient, causing leakage of the cylinder.

The order in which the FESTO cylinder bolts are tightened is incorrect. Generally, the cylinder bolts are fastened from the middle to the two sides when tightening, that is, from the maximum position of the vertical arc or the place where the force is deformed the most, so that the gap at the maximum deformation is free to the front and rear of the cylinder. The end shifts and the gap gradually disappears. If it is tight from the two sides to the middle, the gap will be concentrated in the middle, and the cylinder joint surface will form a bow-shaped gap, causing steam leakage.