It is very important to resolve the problems of anti-friction ring failure due to partial worn at Northern Erdos Work Areas by reasonable selection of high-abrasive materials and welding techniques.

When the humidity in the air content of more than 100%, the sealing ring bacteria get enough water, and the oxygen in the air friction and luminescence, dry after the disappearance.

Teflon Piston-ring integrated with piston, not only reduce the friction and noise, but also avoid inner-leakage.