Re: [PSUBS-MAILIST] exhaust shut off valve

[Rob Innes <innespace@jett.net>]

Couldn't you just use a standard brass plumbing ball valve? How big does
the exhaust opening have to be? Most water cooled marine exhaust outlets
shouldn't get very hot, as long as they're a reasonable distance from
the exhaust manifold. We have home made rubber flappers in our exhausts
which haven't melted yet. I tried getting a ball valve large enough to
use for our dolphin's air intake (about 2" in diameter) but shyed away
from them due to their price, bulkiness, and stiff movement. Also
getting a solenoid to open and close it got too complicated. One really
great slide valve we came across and use for our valve between engine
compartment and cockpit is a 3" diameter valve from an R. V. toilet.
Cheap, airtight and watertight but I imagine you plan to dive below
toilet water depth!

Rob

Brent Shaw wrote:

> I'm looking for a source for reasonably priced high
> temperature ball valves or check valves
>
> Basically I want to be able to drive my boat along on
> the surface under diesel power, turn the engine off,
> close the valve and dive under electric power with no
> water going back up the exhaust and killing the
> engine. From exhaust manifold to hull is 450mm
>
> Any suggestion
>
> Thanks
> Brent - nz
>
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