全密封结构，无油耗，免维护，绿色环保型产品，产品性能符合 EN81-1 要求， 每次动作后不需要人员调整开关打杆垂直位置。

Sealed without any oil leakage, free of maintenance. the are green productes, these buffers are produced and tested copmletely in conformity with EN81-1, It is not necessary to make any adjustment of the swicth activating rod when it is compressed