Anti-pollution check valve
Anti-pollution check (or non-return) valves are used as water protection to prevent the return of polluted water into the water supply. This can occur as a result of pressure changes in the distribution network that cause flow reversal. The anti-pollution check valve, which is installed between the public network and the water distribution system, prevents contact between the waters of the two networks by closing automatically when needed. Maximum operating temperature 70°C.
The anti-pollution check valve has a drain for controlled shut-off, test water, and an additional drain for the dewatering system. All parts of the anti-pollution check valve are protected against corrosion.
They can be PN10 threaded and PN16 flanged. Our anti-pollution check valves have the PZH hygiene certificate. They are used for protection against polluting liquids in drinking water installations in the event of backflow. They can be mounted vertically or horizontally. The correct use of anti-pollution non-return valves of type EA is regulated by the new European regulations on the prevention of backflow pollution. The reference standard is EN 1717: 2000. In this standard, water in systems is classified according to the level of risk to human health.
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 connect upstream and downstream. Under smooth flow conditions, the anti-pollution check valve opens automatically when the pressure in the direction of flow is greater than the pressure of the downstream value. The anti-pollution check valves close early under the action of the force exerted by the spring when the downstream pressure tends to be equal to the upstream value, after the flow has stopped.
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