... of special steel which can provide large opening force Hydraulic Door Opener,Rescue Tools,CE passedOpener foot is made of special steel ... in metal cabinet, implementing rapid mobility aid.Parameter for hydraulic door openerModelGYKM-63-79/120-ARated Working Pressure63MpaMax. Starting Force79KNClosing Distance ... Load≤20timesClosing Time without Load (Free Fall)≤50 s Hydraulic Door Opener,,Rescue Tools