Pipe flange connection
Thread Content
Many fine chemical plants choose flanges with male and female surfaces for connections when the pipeline pressure is high； So far, flanges with male and female surfaces have not been seen in the pipe connections of American standards. Why choose concave-convex face flange connections? Moreover, when replacing the gasket on such a surface with uneven contours, external force is required to separate the two flanges in order to make the replacement possible, which makes the process quite inconvenient ； Secondly, the male and female flanges are sealed by face contact, just like several other types of flanges such as RF flanges. So unless there are regulations requiring the use of these outdated raised and recessed flanges, I generally wouldn’t consider such troublesome raised and recessed flanges at all.
Raised-face flange connections are often chosen for high-pressure pipelines because they provide better sealing performance. The ribbed surface design allows the gasket to achieve a tighter fit between the flanges, thereby enhancing the sealing effect and preventing leaks from pressure or corrosive substances. Although it may require extra effort to separate the two flanges when replacing the gasket, this type of connection offers significant advantages in ensuring the safety and reliability of high-pressure systems. Although it is not as convenient to operate as other types of flanges, its superior performance under high pressure and in specific operating conditions leads to its use. .
Valves above PN40 on the market typically use female flanges; correspondingly, only male flanges can be used with them.
This is closely related to the design specifications of the design institute, as well as the development of sealing gaskets and the requirements regarding medium safety. Today, the wound gasket technology is quite mature, and it offers significant advantages over previous composite gaskets in terms of blast resistance, among other aspects; it can generally replace gaskets with male-female surfaces. The advantages of the RF surface also include easier installation and replacement of gaskets compared to the ribbed surface.