What distinguishes a dynamic seal from a stationary seal?

A dynamic seal is specifically designed to prevent fluid or gas leaks at interfaces where parts are in relative motion. This type of seal operates under conditions where there is movement between the sealing surfaces, such as in rotating shafts or sliding parts, making it essential in applications like pumps, motors, and compressors. The ability of dynamic seals to maintain a tight seal while accommodating movement is crucial for the efficient operation of machinery without loss of fluid or pressure.

In contrast, a stationary seal is intended for use in applications where the components remain fixed relative to one another. Therefore, it is not required to deal with the additional stresses and potential failure modes associated with movement. This distinction is significant for proper sealing solutions in various mechanical assemblies, highlighting the role and function each type of seal plays in machinery.