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Spring-loaded air valve with very high venting capacity for rapid discharge of the medium present in the pipeline, for air release when filling the pipeline and during operation. Large cross-section for venting large amounts of air during fast switch-off procedures, rapid discharge or pipe bursts. Used in bottom outlets, barrages or dams, long-distance pipelines or downstream of large butterfly valves. The integrated friction damper reduces the speed of the closing movement and thus pressure surges.