[modeleng] Re: O rings
- From: "Clif Walker" <clif.gwr@xxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Fri, 21 Nov 2008 17:24:25 -0000
Hi All,
Owing to slippery fingers my post about Silicone O Rings should have read "
cannot take mechanical wear"
Regards
Clif
----- Original Message -----
From: "Clif Walker" <clif.gwr@xxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, November 21, 2008 10:58 AM
Subject: [modeleng] Re: O rings
> 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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>
>
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