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2 Answers

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answered Mar 29, 2014 by Dan01 (1,560 points)
No, never hear of this issue. Until and unless the operable conditions are above the designed conditions of the flanges, this should not happen.
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answered Apr 17, 2014 by Normandy (21,040 points)
Actually, the valve flange-end that is considered the sealing face is part of the valve body (flanged or flangeless valves) and so the separate flanges are there to connect the valves-body, they are not required to seal.  To consider sealing, there are flanged end connections such as flat face, raised face, and ring type joint.