Blast & Fire Protection Systems
Pressure-Vacuum Valve
Keep the pressure balanced in tanks and storage systems to protect the safety of the system.
How it works
A pressure-vacuum valve, also called a breather valve, protects a storage tank from both overpressure and vacuum. It lets vapour out when pressure rises, for example while filling, and lets air in when the tank empties or cools. In between it stays closed, which keeps product vapour in the tank.
Typical applications
- Atmospheric and low-pressure storage tanks
- Fuel, solvent and chemical tanks
- Tanks that need to limit vapour losses
Standards and guidance commonly referenced for this product type
These are general references. Compliance and test reports for a specific product are provided per project.
Why do tanks need both pressure and vacuum relief?
A tank shell is built for very low pressure and vacuum. Filling or heating pushes pressure up, while emptying or cooling can create a vacuum, and either can deform or burst the tank. A pressure-vacuum valve opens in both cases, within the limits given in API 2000 or ISO 28300.
Technical specifications, protection levels and test reports are provided per project. Contact our engineers for details.
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