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Rubber Sewage Check Valve ( Duck-billed flexible check valve in Spain and Duck-billed Rubber Flat bill valve ) is redesigned revolutionarily on the base of Spanish Ross valve company and American Red Valve company.Thanks for its further improvement, the valve has greater intensity, toughness and tightness. What’s more,the valve is free from any repair and maintenance in the view of having no movable parts.Matching with straight pipe, flange pipe, concrete pipe and glassy steel pipe,it can be widely used on the seashore, sand, dock, reservoir and municipal sewage treatment.As green environment friendly valve,it can deal with the difficulty of obstruction by sand, block, silt and so on
