Valve
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I have a question: what is the difference between having two vertical bars on the valve legend and not having them?
At first I guessed it to be a flange connection type, and after doing a search I confirmed that my understanding was correct!
The one with a vertical bar indicates a flange connection, while the one without a vertical bar indicates welding? I’ve never seen welded butterfly valves
This post was last edited by CHANGBAISHI on 2020-8-6 at 16:04. It’s true that welding valves are basically used in all low-temperature cryogenic systems. Such symbols also include threaded connections and socket connections.
Two vertical lines indicate a flange connection, while the absence of vertical lines indicates a threaded connection
Two vertical lines indicate a flange connection, while the absence of vertical lines indicates a welded connection
Two vertical lines indicate a flange connection, while the absence of vertical lines indicates a welded connection
Yes, they do exist, but they’re not very common; they are present in low-temperature conditions
The short horizontal line indicates a flange connection; there should be no thread connection
It has been answered in great detail upstairs. Another issue is that when designing PID diagrams, the connection styles of the valves are ignored; there are no vertical lines shown in them. Using the poster’s legend, the vertical lines represent flange connections. The most common connection methods for butterfly valves are flange connection and wafer connection; other connection methods exist in special working environments. Therefore, the designer of the PID diagram included both flanged and unf Flanged connections in the main diagram.