[modeleng] Re: Drain Cocks
- From: "John Pagett" <john_pagett@xxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Thu, 6 Nov 2008 19:58:30 -0000
Peter,
The answer depends on whether you've got slide valves or piston valves.
If it's slide valves, then they shouldn't see any more pressure than the
steamchest pressure, but with piston valves it is possible for water to be
trapped with nowhere to go as the piston approaches one of the dead centres.
The pressure attained depends on lots of things, wheel/rail grip, train
momentum etc, but can be enough on a full sized loco to remove the cylinder
cover and part of the cylinder with it.
JohnP
----- Original Message -----
From: "The Sheppard Residence" <psbr20252@xxxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Wednesday, November 05, 2008 10:06 PM
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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