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Topic: hard to replace grouphead gaskets (3 msgs / 63 lines)
1) From: Dennis Parham
These would be good for possible replacement group o'rings for old  
espresso machines!http://www.marcorubber.com/square_rings.htmHomeroast mailing list
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2) From: J.W.Bullfrog
Does look right.
On Fri, Aug 28, 2009 at 10:28 AM, Dennis Parham  wrote:
<Snip>
-- 
I've seen things you people wouldn't believe.
Attack ships on fire off the shoulder of Orion.
I watched C-beams glitter in the dark near the Tannhauser gate.
All those moments will be lost in time, like tears in rain.
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3) From: raymanowen
Read their material comparison guide, and note that some materials are rated
well for use at temperatures up to 250 F   For use with steam < 250 F=
, you
might think they're good stuff to get, but the chart says NO.
BUNA-N and Viton might seem to be adequate replacement materials, but
horrible for low temperature steam. The flat washer shaped O-rings, like
garden hose gaskets, are not necessary unless they are the specified part.
Make sure the size specification is correct.
Unless the groove is absolutely clean and the mating face is speckless clean
and unmarred, and you're using the right part or replacement material, it's
almost guaranteed to leak or weep.
Happily, we saved the state of Colorado several thousand dollars. I saw
Teflon tape shreds in the 37 flare fittings of a 12,000psi hydraulic
system. Didn't need a new intensifier or 3,000psi pump, although the
department had been convinced to cut a PO and bill our sponsors for truly
big bucks by someone else.
9bar or 135psi is unlikely to cause (lethal) injury if it sprays on you, but
would be almost impossible to dry up if the grooves are seasoned or the
O-rings are the rong size or material.
Cheers, Mabuhay -RayO, aka Opa!
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