Breather valve

Breathing Valve is a special safety valve installed on the top of storage tanks. It can automatically control exhaust and intake based on the pressure difference between the inside and outside of the tank without external energy, thereby protecting tank safety and reducing medium evaporation losses. Its working principle is driven by pressure differential. The breathing valve integrates two functional units internally: a pressure relief valve and a vacuum relief valve. When the pressure inside the tank rises above the set point of the pressure relief valve, the pressure valve opens to release excess gas. When the pressure drops and creates a vacuum, the vacuum valve opens to admit air and balance the pressure. Under normal conditions, both valves remain closed, effectively preventing the escape of medium vapors. Main types include all-weather type with flame arrester (to prevent lightning-induced fires), pressure-only/vacuum-only valves (providing single-direction protection), and type with a connection pipe (to direct vented gas to a recovery system). They can be flexibly selected according to different operating conditions. The breathing valves produced by Kaivex Valve Group are widely used on fixed-roof storage tanks in the petroleum, chemical, and food industries. Selection should comprehensively consider parameters such as the tank's design pressure, medium characteristics, breathing capacity, and set pressure to ensure reliable operation under all operating conditions.