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Old 13th March 2007, 02:09 PM   #8
geo
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Join Date: Aug 2006
Posts: 327
Default RE: Valve Screws - Suggestion for a better design

Roger,

very interesting points.

Actually I am not much worried about the O-ring being used in the wrong way as it actually acts, as you delineated, as a safety valve, letting some pressure go when the board is heated and letting just a little water in actually when it is cooled/depressurized.

What I really don't like about the O-ring system (even if as a graduated engineer I don't like much such incorrect solutions) is the fact that if, or better say: "when", some sand gets in the hole, the O-ring will not even came close to seal anything, plus it is not easy to detect nor to clean it.

Maybe a good solution would be to use tapered self-sealing screws. My first sandwich board, a Phil McGain proto, just had a small self tapping screw in a piece of plastic, no gaskets, and it worked flawlessly.
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