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Thread: One Way Valves

  1. #11
    Jim Eveland UT 240 designer has a spectacular aura about UT 240 designer has a spectacular aura about UT 240 designer has a spectacular aura about UT 240 designer has a spectacular aura about UT 240 designer has a spectacular aura about UT 240 designer has a spectacular aura about UT 240 designer's Avatar
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    Desco, UT 90, & UT 240

    Re: One Way Valves

    Quite right, Paul: it isn't easy and requires much careful & iterative design, more than most outfits will care to pursue. The improvement is small, worthwhile only when ultimate performance is desired. Usually the first step is an additional part to keep the valve from opening too far, and cause it's open shape to be the optimal curve, like those curved brass stop-bars on the 2-stroke block Yorkie showed. Someone, someday, will take it all the way to "AHA!" Until then, the mushroom will remain the standard, reasonably so.

  2. #12
    Draeger alexander.busch_st is an unknown quantity at this point alexander.busch_st's Avatar
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    LAR, Dolphin, Evolution

    Re: One Way Valves

    You might find the following patents an interesting read:
    3M https://www.google.com/patents/US7849856
    Qinetic https://www.google.com/patents/US20130112205
    Dräger https://www.google.com/patents/US20110203590
    The latter one also shows breathing loops for both conventional mushroom valves and the design claimed.
    The first has actually been used in one of 3Ms respiratory protective half masks. See picture attached.
    Attached Images

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