[modeleng] Re: Parts prices
- From: stepney <alan@xxxxxxxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Tue, 25 Sep 2012 18:22:32 +0100
Clif,
There was one of the full-size pumps that used a shuttle valve as you
described.
Not sure why yours doesnt work.
Never having seen or played with one, I cant offer any suggestions though.
Alan
On 25/09/2012 17:57, Clifton wrote:
> Hi All,
>
> On Duplex pumps I have been building one of the Southworth steam feed pumps,
> the little 3" high one& it is driving me round the twist.
>
> On a full size pump it is usual to have a rocking arm to transpose the down
> motion at the end of the piston rods travel to an up motion of the steam
> slide valve to make it double acting. (& vice versa at the top of the
> stroke). This little beast uses a slide valve which via steam passages
> operates a shuttle valve which then moves the main steam valve in the
> opposite direction.
> As the whole pump is only 3" high you can imagine the size of the steam
> chest which has two slide valves& a shuttle valve in it.
>
> I have now spent about a week trying to get it to work including making
> three news sets of slide valves& a new port face. I have trued to slide
> valve faces& port face using engineers blue& as far as I can see it is
> perfect.
>
> But will it go, will it heck!
>
> I think a bit of redesign is going to happen to get a rocking arm in.
>
> Regards
>
> Clif
>
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