For flanges that comply with the “HG/T20615” standard, what standard should be referred to regarding the specifications of the connection bolts between the flanges and the valves?
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This post was last edited by zhaoqingsheng on 2023-12-29 at 13:20. For flanges that comply with the \"HG/T20615\" standard, what standard should be referred to regarding the specifications of the connection bolts between the flanges and the valves (including bolt length and diameter)?
The bolt specifications should be determined by referring to the valve manufacturing standards or the corresponding flange connection standards. .
Flanges of the class series use fasteners of the class series according to HG/T 20634
For flanges that comply with the \"HG/T20615\" standard, the specifications for the connection bolts to the valves generally require reference to relevant chemical industry standards or valve standards. For specific details, refer to one of the following standards: GB/T 12222-2007 General Valves – Steel Valves with Flanges and Welded Connections. This standard specifies general steel valves with flanges and welded connections, including valves of various types and specifications with flanged ends or welded ends. Among them, Appendix A lists the specification dimensions of the flange connection bolts for reference. HG/T 20615-2009 Steel Pipe Flanges (PN Series) – This standard specifies the requirements for the dimensions, tolerances, sealing surfaces, and fasteners used for connecting steel pipe flanges in the PN series. The specification dimensions for flange connection bolts can be found in the standards.
hg/t20634 specifies the corresponding bolt length. Of course, it can be done by adding up the thickness of the flange, the thickness of the gasket, the thickness of the nut, the thickness of the gasket, etc.