Flame arrester ventilation cap is used for urban industrial and mining enterprises,gas stations,and it's an important accessory. Be installated in the tank(or pumping delivery valve not over 25m²/h of light oil on a small tank).

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 vacuum making the storage tank destruct, prevent the outside flame enter, reduce the tank fluid volatile.

It is one of the measures to protect the drainage gas system in all coal mine gas drainage systems.