多年以来,采用常规的软质填料或填函型压盖满足了液体泵和其它唧取机械旋转轴的密封.这类填料压盖对粗大的转轴的密封是比较差的.而且需要经常维修.在过去的廿年中,已经发展了各种机械面密封.他们的工作性能优良,并且大大优于常规的各种软质填料.因此,他们在各种类型的泵和类似的液压机械上的应用日渐增加. For many years, the use of conventional soft packings or gland seals to meet the requirements of liquid pumps and other mechanical pump shaft seals has been poorly sealed on thick shafts and requires frequent maintenance. Over the past two decades, a variety of mechanical face seals have been developed that work well and perform significantly better than conventional soft packings, and therefore, they have been used in many types of pumps and similar hydraulic machines Increasing application.