[modeleng] Flat valves

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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