[modeleng] Re: Drain Cocks
- From: "Peter Beevers" <peter@xxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Thu, 6 Nov 2008 06:59:37 -0000
Peter,
Hmm, they will have to deal with steam at near boiler pressure - when they
are closed, and steam is admitted into the cylinder on the power stroke,
they will have to stay closed despite that pressure. Worst case, they may
have to resist (for very short periods, when starting), almost 100% boiler
pressure, depending on the efficiency of your steam circuit.
In general, the pressure will be less - while running probably no more that
30-40 psi.
Hope this helps
Peter
----- Original Message -----
From: "The Sheppard Residence" <psbr20252@xxxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: 05 November 2008 22:06
Subject: [modeleng] Drain Cocks
There was a very interesting article in the 7.25" news last time (I
think) about a "centralised" drain cock system which I am currently
building. There were no drawings, just a picture of the components and
the assembled item.
One thing I would like to do is test mine before I install it on the
locomotive, the question is, what sort of pressure do the drain cocks
have to cope with?
It obviously isn't boiler pressure as by the time that they are in use
the steam has done its work and it is being exhausted, but there must
still be some pressure there.
Does anybody have any idea how much (so I can set the air compressor
accordingly).
Cheers
Peter
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