2 questions about butterfly valve product quality! ! ! ! ! !
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As title: 1. According to the inquiry on the Industrial Standard Network, JB-T 53171-1999 butterfly valve product quality grading standard has been invalidated. So which standard is the new replacement standard? 2. Can the current relevant standards for butterfly valves GB12238-89, JB/T8527-97, JB/T8863-2004 regulate butterfly valve products well? Because problems such as leakage occurred during use, it is difficult to find the answer when searching for relevant standards. This post was last edited by charles006 on 2009-3-12 13:15 ]
It is directly invalidated and there is no replacement standard.
You can check the GB/T13927 standard!