Working principle of mechanical seal dynamic and static rings

Actually, the terms "dynamic ring" and "static ring" are relatively common and sometimes not accurate. The accurate terms should be active loop and compensation loop.
The end with a spring is usually a moving ring. There are also exceptions, for high-temperature and high-speed working conditions, some sealing products are designed with a static ring rotating, a dynamic ring stationary, and a dynamic ring only moving axially under the thrust of the spring.
The static ring is usually installed on the cover, and the dynamic ring is installed on the shaft together with the spring. The static ring does not rotate, and the dynamic ring rotates together with the shaft. A few mechanical seals use springs for static rings!
There is another method to determine the dynamic and static rings: the contact surface between the dynamic and static rings is wider and narrower, with the narrower ring being the dynamic ring and the wider ring being the static ring!
The seal that rotates in relative contact between the moving ring and the stationary ring is called a dynamic seal. It relies on a spring loading device and medium pressure to generate a suitable clamping force on the contact surface between the moving ring and the stationary ring. The two smooth and straight end faces are tightly adhered, and a very thin fluid film is maintained between the end faces to achieve the purpose of sealing.