Anti-flood valve datasheet
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■^^^■^ Plumbing & Drainage Solutions Product Datasheet Sewage backflow prevention There are 2 million properties at risk from flooding in the UK. Many will be directly affected by river or coastal flooding, but more homes are damaged indirectly by the backflow of sewage. The causes can include severe storms, breakdown of pumping plant or blocked pipelines. The Marley anti-flood (or non-return) valves have been designed to prevent backflow from surcharging sewers. Wherever there is danger from rising water backing up into a property through the drainage system the valve will close off the backflow automatically to prevent flood damage. The financial losses caused by sewage flooding events can be in the region of £30,000 to £50,000 per property. In less than 30 minutes a house or basement flat can flood with untreated sewage to a depth greater than 1 metre. An anti-flood valve is particularly suitable for the following places: • Low-lying coastal, lake or valley areas • Properties connected to a high flow rate sewage system • Private discharge systems connected to public sewers supplied with pumping stations • Where non-pressure flow control is needed Simple installation, effective operation The anti-flood valves are produced in both PVCu and ABS Plastic and are corrosion resistant. As well as preventing back flow in the system, the anti-flood valve also stops rodent penetration. The Marley anti-flood valve is easy to install within the drainage system. When installing, ensure the valve is set horizontally, as a fall is already built in. Also check that the direction of the flow matches that indicated by the arrow on the cover of the valve. The valve should be installed in a chamber to allow access for maintenance. Emergency closure device The valve can be locked in the closed position for added security (no through drainage allowed) for holiday periods, When backflow occurs in the system the non-return valve closes function correctly ensure the handle is on 'open.' Regular flow rate is regained when the backflow ceases. The emergency closure device mentioned above should be tested once every six months. In case of a blockage, remove the cover, clean the constituent parts, check the gaskets and replace any damaged parts. It is essential that the valve is accessible at all times. The Marley anti-flood valve should be serviced once every twelve months.

The Marley double-flap valve meets the requirements of Building Regulations, Document H1 Marley anti-flood valves An anti-flood valve is a simple and effective way to eliminate backflow through drainage systems. The flap(s) in the valve opens to allow discharge. In a potential flood situation, the rising water levels seals the flap(s) shut. Normal use Anti-flooding situation The Marley anti-flood valve range: Size Colour Code 110 Orange USW120 Width L1 L2 L3 L4 184 61 61 307 230 Single flap Size Colour Code 110 160 Black Black USW130 USW140 Width L1 L2 L3 L4 171 255 65 83 63 82 350 491 184...