Dimensions issue of basic type winding gasket
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For basic type winding gaskets such as those with DN50, different nominal sizes and pressure ratings result in different external dimensions; where can one find the relevant standards?
It is important to be aware of issues that may arise. When using metal wound gaskets, attention should be paid to the flow rate of the fluid inside the pipe. Static conditions are suitable for ordinary types of gaskets, while in environments with internal pressure and flow rates, an inner steel ring should be used (except in cases where flanges with uneven surfaces are involved), in order to prevent damage to the inner layer of the metal wound gasket due to the flow rate. This is especially important at the valve inlet, as it can otherwise cause the valve to be blocked. For reference. It is best to consult the supplier regarding the question you raised.
The Ministry of Chemical Industry has a standard designated as 20610. What I don’t understand is: for ordinary basic type gaskets, namely Type A gaskets, which are the most commonly used gaskets, what standards should be applied regarding their dimensions and pressure ratings?
HG20610-2009 Winded gaskets for steel pipe flanges (PN series), the contents therein
What pipes are we talking about? For pressure pipes, just use HG20610 as the standard. For water pipes and similar, use PTFE gaskets or asbestos gaskets, and cut them to the appropriate size. (In practical use, the asbestos board is directly carved out on the flange.)
It depends on which standard you choose; for DN50, I generally refer to the standards specified in HG20592-20635, which are the standards set by the Ministry of Chemical Industry.
There are several standards in China alone; one simply looks up the standard corresponding to the design in question.
You can get in touch with me; we specialize in manufacturing gaskets.
ASME-B16.20-Gaskets