6. Glossary

anti-extrusion ring; back-up ring

Washer-like device of relatively hard, resistant material installed on the downstream side of a seal (O-ring, U-ring, etc.) to prevent extrusion of the seal into the diametral space under pressure.

guide ring; bague de guidage

Ring supporting radial loads and guiding cylinder rods and pistons.

cavitation; cavitation

Air bubbles in the oil can be rapidly compressed to the point of implosion.

stick-slip; stick-slip

Jerky movement sometimes observed in hydraulic cylinders due to the difference between static and dynamic friction.

thermal degradation

Irreversible and undesirable modification of a material's properties due to overheating....