The current valve plan is to use standard manual ball valves
driven by stepper or servo motors. These achieve acceptably fast control
without the massive continuos current draw of a solenoid valve.
-p
At 02:00 PM 10/2/02 -0400, Alex Fraser wrote:
> I am not manufacturing this valve. I put it on list as I think the
>idea is worth considering. Adapting off the shelf valves to rocketry is
>convenient and speeds production of working machines. This is good, but
>I wonder if what the limits of this methodology are. It's like a "L"
>head piston engine compared to a modern overhead cam design (Briggs and
>Stratton versus Honda).
> Balls and seats are not easy to make. I would think finding a
>suitable off the shelf valve that you could strip the components out of
>and mount in a new valve body/engine would be the way to go.
> Armadillo's main engine on the Spider Man Mover, IIRC sucks down 30
>amps on the main valve and I'm not sure at all what the attitude engines
>use. There will be a point in scaling things up where off the shelf
>electrically actuated valves just won't do for rocketry. I am thinking
>about this, I left the motive force out of the drawing as I just don't
>know how yet.
> Development time allotted to a large light throttable valve will be
>of NO use to KISS or any of the next couple of generations of ERPS
>machines, but there will come a time when you will have to make the
>change and spend the time. A good start would be to make detailed
>drawings of your current OTS valves (if you don't already have them) and
>start building a drawing library.
>
>Bill Clawson wrote:
>
> > Looked at the drawing using Turbo CAD 4.0 -- or
> > whatever the free distribution is called. Are you
> > considering custom manufacturing said ball valve on
> > top of the engine's head?
> >
> > --- Alex Fraser <[EMAIL PROTECTED]> wrote:
> > > Build the valve into the rocket engine body.
> > > I was thinking about this design for a while,
> > > thought I'd sketch it out.
> > > Drawing attached.
> > > The recent postings on emergency shut down made
> > > me regurgitate the
> > > idea. The idea was originally to save weight and
> > > space, but it occurred
> > > to me that if there was no plumbing after the valve
> > > that purging would
> > > be easier, as there would be no pipe to contaminate.
> > > I have omitted the
> > > nozzle and cat pack. This valve would be for H2O2.
> > > I'm cogitating on an
> > > integral fuel valve. I think the H2O2 would cool
> > > this valve enough not
> > > to melt the seal while it was open, when closed I
> > > wonder if the heat
> > > built up during the burn wouldn't burn the seals on
> > > the ball valve
> > > (omitted in drawing).
> > >
> > >
> > > --
> > > >>>>>>>>>>>>>>>>----<<<<<<<<<<<<<<<<<
> > > ........ Alex Fraser N3DER .........
> > > ......... [EMAIL PROTECTED] .......
> > > [~]_>^</\-[~]_>^</\-[~]_>^</\-[~]_>^<
> > >
> > >
> >
> > > ATTACHMENT part 2 application/x-zip-compressed
> > name=bonnet_12.ZIP
> >
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>--
> >>>>>>>>>>>>>>>>----<<<<<<<<<<<<<<<<<
>........ Alex Fraser N3DER .........
>......... [EMAIL PROTECTED] .......
>[~]_>^</\-[~]_>^</\-[~]_>^</\-[~]_>^<
>
>
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