These low-pressure & Vacuum, high-flow valves automatically adjusts the container/storage tank pressure with respect to environmental pressure changes and prevent excessive differentials during airlifts and reduce evaporation losses.
These are used as the primary safety devices
Size Range: 25mm to 250mm (1" to 10")
Pressure Range: 50mm WC to 10000mm WC
Vacuum Range: 10mm WC to 5000mm WC