[modeleng] Re: Naive question

  • From: fernj1@xxxxxxxxxxx
  • To: modeleng@xxxxxxxxxxxxx
  • Date: Tue, 20 Mar 2012 15:40:47 -0400 (EDT)

You might help the wear situation by using a balanced slide valve. 
There is an article in Live Steam magazine showing how to use an "O" 
ring to balance the flat valve which is called a "D" valve over here in 
the colonies..  If anyone wants a photo of the arrqngement, I can email 
one.  That is provided I can figure out how to do it with my new 
computer!!!!!!!

Jesse at Troy, TN


On Mon, Mar 19, 2012 at 4:15 PM, Barrie Purslow wrote:

> Hi Peter,
>
> As far as I am aware the problem is due to the high contact pressures 
> found in slide valves and the higher temperature of superheated steam. 
> If you are using cast iron valves in a model there shouldn't be a 
> problem especially if your lubricator(s) are reliable. Some other 
> material combinations may cause problems especially if you have decent 
> i.e. radiant superheaters and poor lubricator(s).
>
> The answer is to make the slide valves out of carbon filled ptfe. 
> Gives an excellent seal, low friction and is immune to corrosion. 
> Excellent for regulator slide valves too.
>
> Barrie
>
>
> ----- Original Message ----- From: <peter.chadwick@xxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Monday, March 19, 2012 6:56 PM
> Subject: [modeleng] Re: Naive question
>
>
>> Barrie,
>> Yes. Some books call them slide valves, some call them flat valves - 
>> which
>> they aren't really, but it perhaps illustrates the concept..
>>
>> Peter
>>
>>
>>
>> From:   Barrie Purslow <bpduo@xxxxxxxxxxxxx>
>> To:     <modeleng@xxxxxxxxxxxxx>
>> Date:   19/03/2012 16:52
>> Subject:        [modeleng] Re: Naive question
>> Sent by:        <modeleng-bounce@xxxxxxxxxxxxx>
>>
>>
>>
>> Peter,
>>
>> Do you mean slide valves?
>>
>> Barrie
>>
>> -----Original Message----- From: peter.chadwick@xxxxxxxxxxx
>> Sent: Monday, March 19, 2012 2:23 PM
>> To: modeleng@xxxxxxxxxxxxx
>> Subject: [modeleng] Naive question
>>
>> I keep reading in all the books that flat valves and superheated 
>> steam
>> don't go too well together.
>> Why? I can't see it being down to port area......
>>
>> Peter Chadwick
>> Swindon
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