Breathing valve is a kind of air breather which install on the petrochemical fixed storage tank, in order to avoid tank over the pressure or over vacuum making the storage tank destruct, prevent the outside flame enter ,reduce the tank fluid volatile.
Model QZF-89 is designed to vent to atmospheric to protect your tank from damage created by over-pressure or excessive vacuum.The flame arrestor performs as an extinguishing barrier,which absorbs and dispels heat,reduces fire temperature and the oxyen level to stop the fire through layers of metal ribbons shaped with crimped corrugations.
Operating pressure: Type A: +355pa(+36mmH2O) -295pa(-30mmH2O) Type B: +980pa(+100mmH2O) -295pa(-30mmH2O) Type C: +1970pa(+200mmH2O) -295pa(-30mmH2O) Type D: according to user requirement (special pressure rating)
Note: under normal circumstances, (fire) breathing valve operating pressure to B shall prevail;
Applicable materials: gasoline, kerosene, diesel, aromatics, sulfur, air and other petrochemical materials;