Cancellation of mechanical seal, a solution to the headache of frequent servicing of other submerged pumps due to the easily worn-out mechanical seal, a saver of operational cost and a promoter of work efficiency.

• 取消了机械密封，解决了其他液下泵因机械密封容易磨损而须经常维修的烦恼，节约了泵的运行成本，提高了工作效率。