Are the standards for pump inlet and outlet flanges universal: GB/T9113-2010 and HG/T20592-2009
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I would like to ask whether the standards for the inlet and outlet flanges of pumps are universal: GB/T9113-2010 and HG/T20592-2009 PN1.6MPa. Also, what does the \"A\" in HG/T20592-2009 (A) mean? Is there any difference from HG/T20592-2009?
GB/T9113-2010 and HG/T20592-2009 can be used interchangeably for the same pressure grade. In HG/T20592-2009 (A), the letter A indicates that the outer diameter of the flanged fitting follows the A series. The flanged fittings specified in HG20592 are divided into A and B series; the A series is the internationally standard series (commonly known as imperial pipes), corresponding to series 1a of HG 20553, while the B series is the series used in China (commonly known as metric pipes), corresponding to series II of HG 20553