[modeleng] Re: Parts prices
- From: Jesse <fernj1@xxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Wed, 26 Sep 2012 11:35:13 -0500
Clif, just for the heckofit, send me a photo of that Southworth pump.
Never heard of one and would like to see a pic. Many thanks,
Jesse fernj1@xxxxxxxxxxxx
> 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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