One of the most challenging demands of bulding-drainage is to prevent backwater. Anti flood valves are used to prevent backwater from entering rooms that lie under sewer level and are equipped with drainage facilities. HL offers a complete and sophisticated range of backwater preventors reaching from simple pendular flaps to electronic sensor-controlled anti flood valves. Fully opening stainless steel flaps, accurate and easy-to-handle manual blockings, big sized cleaning eyes and reliable impermeability by the use of high-quality rubber seals are attributes for the high standards of construction and production. As a matter of course the whole model-range of HL backwater preventors meets the requirements of ÖNORM EN13564-1 and can - depending on the type - be used to prevent backwater of faeces containing or free sewage in rooms under sewer level according to ÖNORM B2501.
- for feaces containing sewage
anti flood valve with 2 stainless steel flaps, cleaning eye and manual blocking
floor drain DN75/110 horizontal with flange, trap seal, 3-way non-return valve, cleaning eye and 3 inlets DN40/50, cut-to-size grate frame 12 - 70 mm / 123 x 123 mm and stainless steel grate 115 x 115 mm. Comes with lot cover.
floor drain DN75/110 horizontal with flange, trap seal, 3-way non-return valve, cleaning eye and 3 inlets DN40/50, cut-to-size plastic extension 34 - 78 mm, cast iron grate frame 150 x 150 mm and cast iron grate 137 x 137 mm. Comes with lot cover.
basement drain DN110 horizontal with removable triple anti-flood valve (2 x automatical, 1 x manual blocking), 2-piece plastic grate 180 x 250 mm and bucket.
basement drain DN110 horizontal with inlet DN50, removable triple anti-flood valve (2 x automatical, 1 x manual blocking), 2-piece plastic grate 180 x 250 mm and bucket.
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