Economic Double Action Floor Spring(1800-7) 
1.Surface Paint: No painting peel  off     
2.We have passed five different test process(such as pressure-relieving processing) to prevent the oil spill.   Leak   rate:0.3%
3.Unpack Passed Rate:99%
4.We use the hydraulic oil with Anti-fire, Anti-burning, Anti-freezing,could be operated at –45℃                                                                                               
5.The main parts of the machine core have been done the heat treatment processing,it can prolong the working life.
6.Max door capacity:400kg  
7.Max door  opening   angle:105  
8.Max door width& height:1800mm×3500mm                                                                                                                                                     9.Dimension of  appearance :300×161×56mm   
10.Lowest working temperature:–45℃ 
11.Tested cycles:500,000                                                                                                                                                                                      
12.Hold-open at 90 degree
(double action open floor   spring)