The main purpose
GFQ-II all-weather explosion-proof breathing valve for the installation of crude oil, gasoline, kerosene, light diesel oil, aromatics and other fixed top-type storage tank on the main safety equipment is from the evaporation loss and protection When the tank overpressure or vacuum Protect from destruction. This valve is usually used with flame arrester. 
 
The main features of
the valve with ventilation, sealing performance, leakage, corrosion resistance and other characteristics. 
  
 The main shape and flange connection size

Note: Connecting flange in line with JB78-59 "cast iron flange" requirement.