The Right Rod Seals for Every Application

rod sealsGallagher is a longtime partner of Freudenberg Sealing Technologies (FST).  Over the years, we have represented their many brands within the sealing industry, sealing hundreds of different applications.

One such application is a rod seal, primarily used in a hydraulic or pneumatic cylinder. Read on to learn more about the benefits of Freudenberg’s rod seals.

Rod seals are used mainly in pneumatic and hydraulic cylinders. Their task is to seal the incoming and outgoing cylinder rod, with the goal of preventing the pressurized operating medium from escaping the cylinder. At the same time, the medium needs to be protected against external contaminants. FST offers the right rod seal for every kind of cylinder and application.

Freudenberg rod seals are used in state-of-the-art sealing systems for all kinds of cylinders. These seals adapt to the conditions of use and tasks while still meeting customer expectations in terms of service life, functionality and reliability.

State-of-the-art hydraulic rod sealing systems typically consist of several individual seals. The primary seal faces the cylinder’s working space and seals against the cylinder’s high operating pressure.

Behind the primary seal sits as secondary rod seal, which takes over the main sealing function. It is designed to reduce the residual oil film on the rod to a minimum during its extension.  Polyurethane seals are best suited for this task. Their defined sealing lips ensures the finely-tuned wiping of the medium, guaranteeing the leak tightness of the cylinder toward the exterior.

The third element in the rod sealing system is the so-called “wiper, used in addition to the guide elements that prevent the contact of incoming and outgoing rod with the housing. They protect the system’s primary and secondary seals from external influences and contamination. Static seals are also needed for the cover/cylinder housing intersection.


Freudenberg Sealing Technologies has continued to add new functions to its rod sealing systems.

“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,” the company says on its website. “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.”

State-of-the-art pneumatic rod sealing systems use combined wiping/sealing elements, because their operating pressures are lower than hydraulic system operating pressure. Combined with special materials, these sealing systems provide high performance and outstanding value.


Contact Gallagher Fluid Seals to learn more about how Gallagher and Freudenberg can assist you in your next sealing application.