The rod seal is one of the most critical seals on any type of fluid power equipment. The rod seal prevents the pressurized hydraulic fluid within the cylinder from leaking. Leakage can lead to reduced equipment performance, system failure, and environmental/safety issues.

As illustrated at right, rod seals are dynamic seals that are positioned inside the cylinder head (also called gland) and compressed against the cylinder’s rod, thus containing the fluid, which allows pressure to be generated. Some rod seals are engineered specifically for demanding applications that are subject to extreme and arduous operating conditions. These designs are commonly found in medium- to heavy-duty construction, off-highway, excavating and mining equipment. Rod seals designed for low-friction and/or high-speed operating conditions can be found in pumps and engine bearings.


To read more, please visit our friends at Sealing & Contamination Control Tips to see the full article written by Paul Heney and contributed by Ryan Webster, Director of Engineering, Hallite Seals International.