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Manufacturing standards for stainless steel internal thread impeller flow indicators

2018-03-02View Original

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Stainless steel internal-threaded impeller flow indicator / Stainless steel eccentric impeller sight glass / Flow indicator is used to observe the flow of fluid within pipes; it is generally installed on the seal flushing water and circulating water DN15 pipelines of pumps. What are the manufacturing standards for this kind of sight glass? Many online searches show the standard as HGJ501-502-86, but this standard has been discontinued and replaced by HG/T21619; however, the pipe diameters specified in both standards are above DN50. I want to know what the manufacturing standard for this sight is

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