The GFQ anti tempered, anti return air device is a coal mine gas pipeline explosion and combustion chamber to prevent tempering to prevent the return air, the upgrading of products for anti-tempering device. This device with explosion-proof device to belong to the gas drainage and utilization of the system necessary safety facilities. Suitable for installation in gas output pipe system is usually installed near the location from the user or the gas pump, play down, to protect the mine drainage pump station and the user's security. 
 Main technical specifications: 
 Length: 1550 ~ 2400 (mm) 
 Copper network layers, 4-6 layers 
 Copper network diameter: DN200-DN1200 (mm) 
 Height of 1400 ~ 2500mm 
 Pipe diameter of DN200 ~ DN1200 
 Diameter 1000 ~ 1820mm 
 Weight 510 ~ 1550kg