[modeleng] Modern Material

From: "Barrie Purslow" <bpduo@xxxxxxxxxxxxx>
To: "Model Engineering List" <modeleng@xxxxxxxxxxxxx>
Date: Tue, 27 Nov 2007 11:10:52 -0000

I am currently refurbishing a 5" gauge Simplex which has non ferrous cylinders. 
The slide valves are rather badly scored so I have skimmed the top of the 
cylinder block no problem but I am reluctant to skim the valve itself as it is 
obviously not made of a material with good rubbing characteristics against the 
cylinder block.
I have it in mind to make new valves out of carbon filled ptfe which I have 
previously used for a regulator valve with good results but this duty is a 
little more onerous. 
Any thoughts anybody?
Barrie
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