[modeleng] Re: Slide valves

Peter,

The contact pressure between the rubbing surfaces is much greater with slide 
valves than piston valves. With a slide valve the valve is pressed onto it's 
mating surface by steam pressure. With a piston valve the contact pressure 
is merely the weight of the spool piece and the contact pressure of the 
rings.

Regards,

Barrie


----- Original Message ----- 
From: <peter.chadwick@xxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Thursday, April 09, 2009 5:40 PM
Subject: [modeleng] Re: Slide valves


> Why would piston valves have less problem with lubrication when using
> superheated steam than slide valves would? That's what I don't understand.
> Peter Chadwick
>
>
>
>
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