[modeleng] Re: O rings
- From: "Clif Walker" <clif.gwr@xxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Fri, 21 Nov 2008 10:58:46 -0000
Hi All,
I tend to use Viton O rings for steam and sliding joints, the only snag
being that untill I read Craig's e-mail I did not realise that there were
different types so perhaps I have been lucky.
Long before Martin Evans started specifing O rings for the steam pipe
joints at the front tube plate I had worked out that it was far easier to
make a compression joint using O rings than all the fun and games of trying
to screw a bush onto the steam pipe from the regulator while at the same
time screwing the bush into the front tube plate and get it all steam tight.
I also make compression joints for the steam and exhaust connections to the
steam chests.
I have never used Silicone O rings for sliding joints,despite the fact that
ME suppliers recommend them owing to the fact that the O ring manufacturers
say that Silicone cannot mechanical wear. Any comment please Craig?
Regards
Clif
----- Original Message -----
From: "Craig Gluyas" <craig@xxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, November 21, 2008 10:08 AM
Subject: [modeleng] Re: O rings
> As a former seal specialist for a valve manufacturer, i guess this is my
> area!
>
> O-rings are very suited to our uses, we just have to be careful what
> material to use. Silicone is about the best & most widely suitable for -15
> to 200'C. Other materials vary, even to within blends. For example Viton A
> is not recommended for use with steam where as Viton B or Viton GF is.
> Viton is good for about the same temperatures as Silicone.
>
> Other seals such as EPDM and Nitrile are readily available, but are less
> tolerant to chemicals (Natural Rubber does not like Oils for example)
>
> An excellent compatibility website used in the industry is available here
> http://www.coleparmer.com/techinfo/ChemComp.asp
>
>
> Hope that helps!
>
> Craig
>
>
>
>> There is a discussion on a message board about the use of O rings in
>> model
>> steam engines.
>> Both the types and where they are, or are not, suitable, together with
>> the
>> advantages /disadvantages of them compared to other forms of seal.
>>
>> What opinions do members here have?
>>
>> Alan
>>
>>
>>
>> MODEL ENGINEERING DISCUSSION LIST.
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>
>
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