全密(mi)封(feng)結構，無油耗，免維護，綠色環(huan)保型(xing)產(chan)品，產(chan)品性能符(fu)合 EN81-1 要求， 每次(ci)動作后(hou)不需(xu)要人員調(diao)整開關(guan)打桿垂直位置(zhi)。

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