全密封結(jié)構(gòu)，無油耗，免維護，綠色環(huán)保型產(chǎn)品，產(chǎn)品性能符合 EN81-1 要求， 每次動作后不需要人員調(diào)整開關(guān)打桿垂直位置。

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