[modeleng] Re: Piston Glands
- From: "Clif Walker" <clif.gwr@xxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Mon, 7 Nov 2005 20:20:26 -0000
Hi,
Whilst O-Rings are OK I think that in that situation I would rather fit
packing which consists of PTFE. The best stuff is the solid round section as
used for packing the glands of Steam Valves,Water Valves and the like. After
the initial tightening up after a bit of running,they do not usually need
adjusting for a long time and the stuff is friction free. The only snag over
here is getting it as it is usually only sold in expensive large reels
whereas in America it is sold in little packs as a DIY item.
Regards
Clif
----- Original Message -----
From: "Barrie Purslow" <bpduo@xxxxxxxxxxxxx>
To: "Model Engineering List" <modeleng@xxxxxxxxxxxxx>
Sent: Monday, November 07, 2005 7:27 PM
Subject: [modeleng] Piston Glands
>I am currently refurbishing a 5" Duchess. The engine has seen quite a bit
>of use, having had several owners the last of whom dumped it in a barn! I
>am currently working on the cylinders which have rusted quite badly.
> The piston rod glands are fairly conventional stuffing boxes but each
> gland has four 10ba studs with a pair of locking nuts on each stud. This
> arrangement is very difficult to adjust on the outside cylinders and
> virtually impossible on the inside cylinders (It is a four cylinder
> engine). I am contemplating modifying the arrangement and replacing the
> stuffing boxes with O rings. Similarly with the piston valve rods. Whilst
> I have used O rings with considerable success on piston valve rods I have
> never tried them as a piston rod seal.
> Any thoughts gents?
> Barrie
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