Tank blanketing valves offer complete protection to the storage tank product against contamination and to the storage tank itself against rupture or damage. This type of valve is mainly used in the chemical, bulk storage, and pharmaceutical industries to reduce emissions and lower the cost of product loss. In addition to preventing outside air and moisture from entering the storage vessel, a blanket gas pressure reduces the evaporation of the stored product to a negligible amount.
The operating principle of the tank blanketing valve is to maintain a positive pressure within an enclosed storage tank by introducing a gas such as nitrogen into the vapour space above the product at a required pressure.
This 'blanket' prevents the stored product from vaporising into the atmosphere, prevents contamination to the stored product, and also helps to reduce product combustibility by eliminating oxygen-rich air.