In the design of safety valves, how are the sealing surfaces determined?
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I calculated do=40mm and DN=65mm using the \"Practical Valve Design Manual (2nd Edition)\” (page 1204). Next is the calculation for the safety valve seal; for this purpose, the average diameter of the sealing surface as well as its width are required. The PDF states that these values are to be specified during design, but my teacher did not provide me with these figures. . . Is this value based on experience, or can it be found in some standard? I designed a fully open spring safety valve.
This post was last edited by Yimi on 2016-4-7 20:25. This is not experience points; it can be found in the standards. The purchase data sheet or specification sheet for safety valves should specify the flange standard and seal face type to be used. Designed or user-defined.
Yisuan Cloud has recently released a safety valve calculation software; it’s quite good. Those who find it useful can give it a try
Valve design should rely entirely on standards; estimation should not be used, otherwise construction will not be possible. Especially when it comes to safety issues, these are not trivial matters
First, thank you all. I searched extensively and found an article on CNKI that stated that the formula for the sealing pressure ratio in the \"Practical Valve Design Manual\" was incorrect. Then I went to the library and obtained a copy of the \"Valve Design and Calculation Manual\", where I found the information on the dimensional design of the sealing surfaces in Appendix B.
The formula for calculating the sealing specific pressure is correct; what’s wrong is the requirement that there must be a certain sealing specific pressure. If we follow the guidelines in the valve design manuals, no safety valve would be able to meet the design requirements.