General technical conditions for slow closing check valve for water supply and drainage
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On September 30, 2001, the Ministry of Construction approved the promulgation of the industry standard for urban construction in CJ / T154-2001 "General Technical Conditions for Slow Closing Check Valves for Water Supply and Drainage". And demanded that it be implemented on June 1, 2002. Slow closing valve to the drainage Now the standard about the content as follows: