[modeleng] Flat valves
- From: peter.chadwick@xxxxxxxxxxx
- To: modeleng@xxxxxxxxxxxxx
- Date: Tue, 30 Oct 2007 09:03:39 +0000
When the 12 inch to the foot scale started using superheated steam, the
books tell us that lubrication problems meant flat valves were
unsatisfactory, and piston valves were needed. Why? I can see that it's
easier to get a given port openeing with a piston valve than a flat valve
in a given size, but I don't understand why lubrication makes the piston
valave more desirable.
Peter Chadwick
Swindon
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