AS-C303 customized double cartridge mechanical seal

This customized seal belongs to the SAF series of seals having  such features as：double balanced cartridge design seals， particularly engineered to adapt to heavy process industries where liquids are mainly containing solid particles and impurities，with ease of installation & low maintenance costs，nearly for all applications，Ultimately suitable  for screen sealing usuage，with a wide range of OEM designs like the one in the vedio. 

Background Knowlkedge：

The working principle of air film seal（a kind of mechanical seal ）（2）

During normal operation, the seal's closing force and opening force (film force) are in equilibrium (under ideal design conditions). When the sealing gap is reduced by external interference, the air film pressure on the end face increases rapidly, and the efficiency of the opening gap of the spiral groove increases, so that the opening force is greater than the closing force, forcing the end face to return to the original state; on the contrary, when the external interference increases, The pressure of the air film in the gap drops, so that the opening force is smaller than the closing force, and the gap between the sealing surfaces is reduced and returned to the original state. It can be seen that the gap recovery mechanism of the air film seal ensures the good followability of the compensation ring under the action of the spring to the axial displacement, angular displacement or yaw of the non-compensation ring.

In the gas film seal, to ensure that the sealing end face has sufficient opening force and gas film stiffness, the gas film seal must increase the hydrodynamic pressure effect on the basis of the hydrostatic pressure. At the same time, the fluid dynamic pressure groove has the function of providing and controlling the hydrostatic pressure effect and dynamic pressure effect of the gas film.

Therefore, the gas film seal is considered to be a hybrid seal with both static pressure effect and dynamic pressure effect.

（pls find （1）in https://www.aefluidtec.com/products/as-b298-customized-metal-bellow-mechanical-seal.html?is_preview=79fcf45eb2f443e74937417898a277db）