An important part of hydraulic cylinders, seals contain fluids that allow to prevent fluid leakage between components. Seals are mainly divided into two categories; static and dynamic. Dynamic seals are mostly used for parts present in relative motion. Rod sealing system uses seals that protect dynamic reciprocating motion used for piston rod and head.
Between piston and cylinder, the dynamic reciprocating motion is another dimension of hydraulic cylinder which uses dynamic seals.
Static seals on the other hand are used between fixed components. Commonly in a hydraulic cylinder, static seals are employed between a piston and a piston rod, and between a head and a cylinder bore tube.
Piston seals, rod seals, buffer seals, wiper seals, guide rings are some of the types of dynamic seals that feature special functions with regards to cylinder performance.
Seal failures are caused mainly due to exposure, abuse and over time use. Apart from this, hardening, wear, fracture, scarring, contamination, improper installation, and chemical erosion are also some of the main attributes for seal failures.
Based on fluid pressure range, stroke speed, fluid type, temperature range, hardware dimensions, cylinder application, one can select seal type. The selection mainly depends upon application parameters and information on operating conditions of hydraulic cylinders.