الوصف

Speed control : 2 stage adjustable
Body : wrought iron
Stainless Steel **4, 1mm thick cover
Double-spring design, opening lightly and smoothly, prolonging service life.

Inside pressure reducing valve to prevent the destruction on occasion that the door closed by strong pressure or wind force.

Use low temperature frostbite hydraulic oil, ensuring the normal door-closing speed when the temperature is forty degree below zero.

General design, suitable for left and right hand to open the door in single and both sides.