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What does BB stand for?

BB stands for Bolted Bonnet

This definition appears very frequently and is found in the following Acronym Finder categories:

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We have 199 other meanings of BB in our Acronym Attic

Samples in periodicals archive:

The new line is available in sizes DN6 -- DN300 (1/4 inch -- 12 inches) and incorporates an anti-blowout spindle, anti-liquid lock drain and the unique Bestobell loose flange bolted bonnet design - which allows for thermal expansion and contraction and eliminates leakage at the bonnet gasket.
The valves feature top entry trim and bolted bonnet to facilitate easy access to all internal parts for in-line inspection, maintenance and trim replacement.