When installing a chevron-type seal in an aircraft hydraulic cylinder, which direction should the open side of the seal face?

When installing a chevron-type seal in an aircraft hydraulic cylinder, it is essential that the open side of the seal faces in the direction of fluid pressure. This design allows the hydraulic fluid to exert force on the seal, effectively pressing it against the sealing surface. As the fluid pressure increases, it enhances the seal's grip on the mating surfaces, thereby improving its sealing capability and preventing leaks.

This configuration ensures that the seal remains effective in preventing fluid from escaping the cylinder, as the pressure pushes the lips of the seal tighter against the cylinder walls. If the open side were facing away from the fluid pressure, the seal would not be adequately pressed against the surfaces, potentially leading to leakage or failure of the seal under pressure.

Seals must be installed correctly to ensure operational efficiency and safety in hydraulic systems, which underscores the importance of understanding the correct orientation for chevron seals.