Rod and Piston Seals

The function of a rod seal is to act as a pressure barrier and minimize fluid bypass along the dynamic (rod/ram) surface and the static (stuffing box bore) surface under various operating conditions. It regulates the fluid film during extension of the cylinder rod. 

The function of a piston seal is to minimize fluid bypass between the piston head and cylinder bore under various operating conditions and to act as a pressure barrier. It helps to maintain system efficiency and plays an important role in controlling the cylinder motion and maintaining position.