HH46X, HH48X, HH49X type micro slow closure butterfly valve system products can be used in clean water, sewage, sea water and other media drainage pipe, not only to prevent the backflow of the medium, but also to effectively limit the destructive water hammer, to ensure the use of pipeline safety. It has the characteristics of novel structure, small size, light weight, small fluid resistance, reliable sealing, smooth opening and closing, wear resistance, long service life, oil pressure and slow closing are not affected by the medium, and good energy saving effect

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