... 20-0 triangle doorcloser A063,special type which is follow design of Dorma-84 MODELDESCRIPTIONPCS/CTNG.W./CTNN.W./CTNMEASA063triangle ... leakage.4.Two hydraulic pressure valves control two sections of door closing separately.5.passed the fire-testing by National ... are often used on the door of safe exit and entrance,hotel,washroom,Resturant, and many places. triangle/hut design door closer (A063)