BREATHER VALVE PRODUCT INFORMATION
The NV400 Tri-Action direct acting Pressure/Vacuum Relief Valve or Breather Valve is a special relief valve specifically designed for tank protection.
It is fitted with a 2" (50mm) BSP threaded base and the outlet is vented to the atmosphere. The NV400 Tri-Action valve is used extensively on bulk storage tanks, the valve prevents the buildup of excessive pressure or vacuum which can unbalance the system or damage the storage vessel.
BREATHER VALVE APPLICATION
Bulk storage tanks, maturation tanks, low pressure gas applications and storage systems.



