1. Definition of guide ring
Strictly speaking, it is not a seal because it has no sealing function. Broadly speaking, it can also be said to be a seal because it is an indispensable supporting role in the seal combination structure.
2. The function of the guide ring
The guide ring is also called a wear-resistant ring or a support ring, and when supplied as a coil, it is also called a guide belt or wear-resistant belt. His function is to guide and absorb radial forces on the piston and piston rod.
3. Common sealing materials for guide rings
The guide ring generally uses the same sealing material as the piston ring, and commonly used sealing materials include filled polytetrafluoroethylene (PTFE) and filled polyimide (PI). PTFE filling is made by using polytetrafluoroethylene (PTFE) as the matrix and adding a certain proportion of filling agents (such as glass fiber, bronze powder, graphite, molybdenum disulfide, etc.). It has excellent physical, chemical, and wear resistance, is cheap, easy to form, and is a commonly used sealing material for guiding.
Secondly, modified polytetrafluoroethylene guide ring: low aerodynamic resistance, not suitable for crawling at low speeds; Low friction, suitable for high-speed, medium, light load and hydraulic cylinder applications; Adding fillers such as graphite is suitable for oil-free lubrication of cylinders.