Product Description
A breather valve also called a pressurevacuum relief valve is a safety device installed on atmospheric or lowpressure storage tanks to control internal pressure and protect the tank from damage
Heres a clear overview
What Is a Breather Valve
A breather valve automatically opens to
Release excess internal pressure pressure relief
Allow air to enter the tank when pressure drops vacuum relief
It breathes with the tank as the liquid level or temperature changes
Where Breather Valves Are Used
Common on tanks storing
Fuels diesel gasoline aviation fuel
Solvents
Chemicals
Water or wastewater
Any liquid where vapor and pressure buildup must be controlled
Why Breather Valves Matter
They prevent
Tank collapse from vacuum conditions
Tank rupture from overpressure
Product loss
Evaporation emissions VOC control
Some designs include flame arrestors for fire safety
How They Work
A breather valve has
A pressure pallet lifts when internal pressure gets too high
A vacuum pallet opens when internal pressure gets too low
Both are typically lightly weighted or springloaded
Types of Breather Valves
Pressureonly valve
Vacuumonly valve
Combined pressurevacuum relief valve most common
Breather valve with flame arrestor
Typical Setpoints
Very low pressure ranges inches of water column not psi
Set according to tank design pressure and environmental regulations
If you want I can also explain
How to choose the correct breather valve
Setpoint calculation
Differences between breather vs emergency vent
Diagrams or a simplified illustration