![]() ![]() Google the terms concentric and offset butterfly valves and you will get links to many manufacturer web sites that will have plenty of pictures and videos showing the difference. Note that the above is a generalization for each category, and there are many exceptions in each. Lots of variety which makes these suitable for a variety of temperatures and pressures. ![]() The offset type can have rubber, polymer (PTFE or other), metal &graphite, or even metal seats. Most of the offset types cause the disc to rotate freely from the seat after a few degrees of rotation, which minimizes seat wear and increases valve cycle life. These are popular in low pressure systems (Class 150 or less), relatively lower cycle life, rubber liners are also good for abrasive slurry services.Ĭategory B valves are "offset" type, meaning the shaft is offset from the disc, so they can handle higher differential pressures. Valves shall be tested with full pressure end thrust effect to check. ![]() Also known as rubber lined butterfly valves. and Annex V acceptance criteria FE Class B. However, category A valves are "concentric" type. All valves shall be self-locking manual gear operation type which is. You would get more responses if this is posted in Valve Engineering. ![]()
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May 2023
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