The anti-pollution check (or non-return) valve is used as water protection to prevent the return of polluted water to the water supply. This can occur as a result of pressure variations in the distribution network that cause reverse flow. The anti-pollution check valve installed between the public network and that of the water distribution systems prevents contact between the waters of the two networks and automatically closes when necessary. Maximum operating temperature 70°C.
The anti-pollution check valve has a drain for controlled closure, test water, and an additional drain for the dehydration system. All parts of the anti-pollution check valve are protected against corrosion.