Antipollution check valve
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.
They can be threaded PN10 and flanged PN16. Our anti-pollution check valves have the PZH hygiene certificate. They are used to protect against polluting liquids in drinking water systems in the event of backflow. They can be mounted vertically or horizontally. The correct use of the type EA anti-pollution check valves is regulated by the new European standards for the prevention of pollution caused by backflow. The reference standard is EN 1717: 2000. In this standard, water in the systems is classified according to the level of risk to human health.
The anti-pollution check valves consist of a valve body, a check valve, and, if necessary, one or more inspection points for control operations and procedures in the exhaust system. These valves are connected upstream and downstream. In regular flow conditions, the anti-pollution check valve opens automatically when the pressure in the flow direction is greater than the pressure of the downstream value. The anti-pollution check valves close early under the action of spring force when the downstream pressure tends to be equal to the upstream value after the flow has stopped.