ASTRAL 4 Inch (110 MM) Back Flow Prevention Valve (Non-Return Valve) / (Pack of 1) Check Valves

The Backflow preventer valve is typically used to shield private underground seepage frameworks and for flooding protection which is mainly caused by the public sewer system. Application: • Buildings having plumbing fixtures on ground level & basements • Buildings in low-lying & flood-prone areas • Preferably all buildings, as a good engineering practice Woking Principle: In normal working conditions, the wastewater will flow from the building through the back flow valve into the sewer. Astral Back Flow Preventer Valve applies a simple and sturdy mechanism of non-return flow through a flap & sealing ring. During a backwater incident, backwater from the sewer is prevented from entering the building by the backwater flap. The flap can also be locked manually if required. Standards & Specifications: Astral Back Flow Preventer Valves are being manufactured according to EN 13564 Installation: • The valve should be installed in the main waste line connecting to the municipal manhole. Also, ensure to install it after the connection of the last plumbing fixture. • The valve should be installed in visible, easily accessible spaces • Preferably, the valve should be installed in the inspection chamber so that it can be easily operated & maintained and protected from any external damage • Valve should be installed on levelled & compacted surface. Spirit level provided on top of the valve can be used to maintain the correct level