全密封結(jie)構，無油耗(hao)，免維護，綠色環(huan)保型產品，產品性能符合 EN81-1 要(yao)求， 每次動(dong)作后(hou)不需要(yao)人(ren)員調整開關打桿(gan)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