[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

Zarlink Semiconductor Limited is a Company registered in England and Wales
under number 00705031 with its registered office at Cheney Manor, Swindon,
Wilts SN2 2QW, England.

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