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[Bernhard]

WHAT WILL BE THE BEST ORINGS TO TVR1A   AND WHERE TO BAY THEM
THANKS


0-ring, 1/1 6” x 3/16”  0-ring, 1/8” x 1/4” 0-ring, 3/8” x 1/2”

[frazer heslop]

I use this companies O rings and never had a problem . You can get them a lot cheaper in large quantities from trade suppliers but for the few I need it would take several lifetimes to use them up
https://www.glrkennions.co.uk/silicone-o-rings.html
regards
frazer

[Bernhard]

Many Thanks..so silicon is IT Better Than viton..

[rhavrane]

Bonjour Bernhard,
Found on the NET :
"Silicones are very stable at low and high temperatures. ... Viton provides excellent resistance to compression set at high temperatures which accounts for its ability to maintain sealing force and remain tough and elastic even after long exposure to 392 degree F. air or 300 degree F. oil."

In France, our manufacturers (JMC, JPB, Anton) use Viton O'rings for their pistons segments.

[Bernhard]

Thanks ..so..I Think the vitron it be
But Where do you bay ..just 6 of each  in eu..

[frazer heslop]

Try this company
https://www.engineersmate.com/products/Imperial-O-Rings/C106277

[derekwarner]

Bernhard......

1. Raphael is 100% correct.....elastomer manufacturers nominate that MQV [Silicone] is for static seal application, and although FPM [Viton] has a low abrasion resistance is the preferred elastomer for our relatively low pressure steam applications

2. If you were to view the Gerknnions listings of o-rings for steam, you will see the actual sizings you require are not shown

3. O-ring Standards are ....American AS 568, British BS 1806, German DIN 3371 and ISO 3601/1 and the Japanese JIS B2401, however are universally designated as bore size x section

So, the o-rings you require are sized from the following Table.....if you include the BS Codes + your chosen elastomer, no-one can supply you with an incorrect size

1/1 6” x 3/16”  = 0.0625 x 0.0625 = BS 2-003

1/8” x 1/4”  = 0.125 x 0.0625 = BS 2-006

3/8” x 1/2” =0.375 x 0.0625 = BS 2-014

Derek

[Bernhard]

Ohh  so  Many thanks for your Help  i Will ordre that..Thanks again
Regards Bernhard

[derekwarner]

Be careful Bernhard, the Table shown for Engineersmate is   NBR elastomer & not recommended for our 100 degrees C steam........



If you use this site table  you must change to an alternate elastomer [within the WEB page options]


So in addition to the correct sizing and BS Code, you must also specify the elastomer material you choose






Derek

[Bernhard]

Thanks Derek..
when i will ordre from Parker i lookto a big Company,,so  im not shure they will sell me just 6 of each,,,is there a place the do that in uk,, you know of
Thanks
BBB

[derekwarner]

Bernhard.....[I am in Australia]


The humble o-ring is the most blamed component for internal bypass or external leakage failure within fluid systems.....however studies conclude some 73% of the this is because the 0-ring has been incorrectly measured/specified, ordered or and installed 


If you are confident the dimensions you have supplied, I am confident with the sizing dimensions & BS Coding I have provided


The WEB site provided by Frazer displays a correct Table of dimensions.....[after you nominate the material......you can also look & confirm the dimensions of the o-ring are those required etc]


I cannot comment on the $costings....[if you needed 1000 of each size you would pay far less than advertised]


Derek

[Bernhard]

Thanks Derek...
i did try to ordre this
but im a old full ..
i think i better just stay with the ones i can get from Graham,, it is to much for my old monkey brain... i just got this...i did send them the number from usa size and the one you did for me,,

Good morning.Thank you for your email.When it comes to steam, viton material is not a good solution.A better solution would be as below.Less than 300 ℉ = 148.8889 ℃ better material will be EPDM.Above 300 ℉ = 148.8889 ℃ FFKM material will be better.But of course the choice is yours.Please confirm the size of the O-rings and material



BS003  O-ring 1.42mm ID x 1.52mm CS

BS006 O-ring 2.9mm ID x 1.78mm CS

BS014 O-ring 12.42mm ID x 1.78mm CS

[derekwarner]

Bernhard........such is the continuing complication of the o-ring  when the o-ring is not at fault


If the engine manufacturer 'Graham' can supply original o-rings as spares and at an acceptable cost.....well & good 


I choose not to comment on your suppliers reference on EPDM as a superior elastomer, .......as the Parker reference [below] advises that this EPDM is not compatible with mineral oil....


[maybe he is an 18 year old quoting his today's knowledge from a computer screen...and yes ..obviously so importantly quoting temperature limitations in degrees Fahrenheit to the 4th decimal place ]


[possibly this makes my 50+ years in fluid engineering prior retirement old school]


Now we know you are using a steam engine, however with a steam oil lubricator which contains mineral based steam oils.........


Many think it good to spray WD40 or RP7 aerosols  into our small steam engines to stop corrosion........yes good for steel components, however these WD40 and RP7 fluids contain chemicals that prematurely soften & degrade  o-ring elastomers......

[Bernhard]

Thanks yes  i didnt Know it was so a big problem to get Some
 Vitron orings..it was only .Ihave  promis to rebuild MY Friends
 Engine  so I just WONT the best orings..and sometimes it can take long time Before Graham replay..emails.. ok..Thanks

[KNO3]

You could pack the cylinders with Teflon tape instead of orings. I have done this in many engines and works well with lower friction than many orings.