Fainger engineering is providing a wide range of breather valves. It comes with following technical specifications: size range: 25 mm to 250 mm [1" to 10"] pressure range - 50 mm wc to 10000 mm wc; and vacuum range - 10 mm wc to 5000 mm wc. These are low-pressure and vacuum, high-flow valves. They adjust tank pressure with the change of environmental pressure. They also prevent excessive differentials at the time of airlifts and reduce evaporation losses
