本系列密封为106型改型产品，双弹簧、双端面、非平衡型结构，其密封腔内应保持循环冷却润滑磨擦付。

Model 206 sealing is the modified product of Model 106 and adopts double spring, double end face and non  cquilibrium structure. The sealing cavity shall be retained with circulation liquid inside and coolant lubricates the friction pair.