balanced mechanical seal

例句：

1. 1. The balanced mechanical seal in the pump is responsible for maintaining the pressure.
   泵中的平衡机械密封负责维持压力。
2. 2. The engineers carefully balanced the mechanical seal to ensure smooth operation.
   工程师们仔细平衡了机械密封，以确保平稳运行。
3. 3. The new design of the balance mechanical seal has significantly improved efficiency.
   新型平衡机械密封的设计大大提高了效率。