Intro to Dynamic Seals

Interference Seals   Flat Diaphragm Seals   Molded Diaphragm Seals

Hydraulic and pneumatic systems that convert fluid pressure into force or motion invariably use some form of dynamic seal.

The energy conversion in such systems is usually accomplished by a cylinder – an enclosed, stationary barrel containing a moveable piston.  Liquid or gas introduced under pressure into the cylinder exerts force on the piston head, creating motion that can pull, push, position, open, close or regulate a mechanical device or assembly.

To keep the pressurized fluid from leaking past the moving piston, a dynamic (motion-tolerant) seal of some kind is required.  Several types of dynamic seals are commonly used, with the selection depending on the specific requirements of the application.