Questions about flange metal wound gaskets
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For flanges with PN320 and PN400 standards in the flange standard GB/T9124.1, corresponding dimensions are provided for both the male and female sealing surfaces. However, no metal wound gaskets matching these standards can be found; the highest pressure level available for PN series gaskets is PN160 only. How should one choose the sealing surface, and how can one find the corresponding standard numbers?
For the male and female sealing surfaces of PN320 and PN400 flanges, high-pressure metal wound gaskets are required. These gaskets may fall outside the scope of the GB/T9124.1 standard; therefore, other relevant standards for high-pressure flanges and gaskets, such as GB/T4622.2, should be referred to. The specific grades and sizes of metal wound gaskets need to be discussed with the manufacturer, or selected in accordance with the requirements of the relevant equipment and engineering design. If information cannot be found in existing standards, consult a professional seal product supplier to obtain the correct product model and specifications. .
I have looked up these standards, but there are no clear specifications regarding the specific operating pressure and dimensions
If the standards do not specify the required pressure and dimensions, it is recommended to contact professional manufacturers or suppliers of metal wound gaskets. They usually offer custom services and can design and produce metal wound gaskets suitable for PN320 and PN400 pressure levels based on your specific requirements and the parameters of the flanges. At the same time, it is also possible to consult engineers or designers with relevant experience in order to obtain more professional advice and solutions. .
Other standard flanges and gaskets can be used, such as HG/T20592-2009
For PN320 and PN400, it is generally considered that metal wound gaskets should not be used at pressures above a certain level. Flanges with flat sealing surfaces, such as those that use surface sealing, can be equipped with toothed gaskets covered with flexible graphite.
This post was last edited by Wang Kuan_ArzDB on 2024-5-11 at 10:30. I checked the standard PN series (GB/T-4622.1); no recommendations are available for winding gaskets with a PN rating above PN250. However, the Class (HG/T20631) series can be used at PN420. I’m not sure why that is
For the PN320 high-pressure flange type, metal wound gaskets are generally not used; instead, lens gaskets are employed
I find it strange that the 9124.1 sealing surface specification provides exact dimensions; yet when manufactured according to those standards, there is no gasket available for use. So what’s the point of giving exact dimensions and application ranges?