State-of-the-art pneumatic rod sealing systems use combined wiping/sealing elements as their operating pressures are lower than those of hydraulic systems. They effectively prevent an excessive system-related buildup of pressure within the sealing system and protect against the premature failure of the primary and secondary seals. For example, in addition to storage modules to take in drag oil, pressure discharge functions are used when special requirements arise, including long strokes or great differences in a rod’s incoming and outgoing speed. In addition, Static Seals are needed for the cover/cylinder housing intersection.įreudenberg Sealing Technologies has continued to develop its rod sealing systems and to equip them with additional functions. Their task is to protect the systems’s primary and secondary seals from external contamination and influences. So-called wipers are used as a third element in the rod sealing system, in addition to the guide elements that prevent the contact of the incoming and outgoing rod with the housing. With their defined sealing lip, they ensure the finely tuned wiping of the medium, guaranteeing the leak tightness of the cylinder toward the exterior. Seals constructed of polyurethane are preferably used for this task. It is above all designed to reduce the residual oil film on the rod to a minimum during its extension. The secondary Rod Seal fitted behind it takes over the main sealing function. The so-called primary seal faces the cylinder’s working space and reliably seals against the high operating pressure within the cylinder. State-of-the-art hydraulic rod sealing systems generally consist of several individual seals (see example in Fig. They are specially adapted to the respective conditions of use and tasks while meeting customers’ high expectations for maximum reliability, service life and functionality. Rod Seals from Freudenberg Sealing Technologies are used in state-of-the-art sealing systems for cylinders of all kinds. Maximum Efficiency From the Best Possible Combination

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