Hi,

Had some feedback on the wiki/faq that mentioned:

"Hi John, I enjoyed reading the article on the operation of the 3 port
valve which was just up my street. You may be interested to know that
the rubber ball inside sometimes swells up to more than twice it's
normal size and block's port A & B and prevents circulation so before
replacing the actuator make sure the shaft can be moved back and forth,
it only moves about 1/2" each way but it proves the ball has not
swollen. A service kit is available which includes the innard's of the
valve. I blame all the different addative's that get added into the
system and the incorrect doses of the same. I have laso known this
swelling happen to the rubber seals inside diverter valves on combi
boiler's etc. preventing their correct operation. Hope this info is of
some use to you and your reader's"

Debating on where would be appropriate to include this. Does anyone know
which brand / type of valve includes a ball of this type? (never taken
the wet bit of one apart before!)


--
Cheers,

John.

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In message , John
Rumm writes
Hi,

Had some feedback on the wiki/faq that mentioned:

"Hi John, I enjoyed reading the article on the operation of the 3 port
valve which was just up my street. You may be interested to know that
the rubber ball inside sometimes swells up to more than twice it's
normal size and block's port A & B and prevents circulation so before
replacing the actuator make sure the shaft can be moved back and forth,
it only moves about 1/2" each way but it proves the ball has not
swollen. A service kit is available which includes the innard's of the
valve. I blame all the different addative's that get added into the
system and the incorrect doses of the same. I have laso known this
swelling happen to the rubber seals inside diverter valves on combi
boiler's etc. preventing their correct operation. Hope this info is of
some use to you and your reader's"

Debating on where would be appropriate to include this. Does anyone
know which brand / type of valve includes a ball of this type? (never
taken the wet bit of one apart before!)


Older Honeywell valves had balls which were later replaced with a paddle

I don't think that swelling up is much of a common problem - what causes
the rubber ball to swell? ... some pratt spraying it with WD40 ? I can't
see which proprietary additive would be absorbed by rubber


Where's Ed when you need him ?




--
geoff

geoff wrote:

I don't think that swelling up is much of a common problem - what causes
the rubber ball to swell? ... some pratt spraying it with WD40 ? I can't
see which proprietary additive would be absorbed by rubber

White lithium grease. I've found. Oops ;-)

Though it wasn't a 3-port valve but some rubber seals in one of those
Aqualisa motorised shower pumps. Now have tube of plumbing lubricant.

--
Scott

Where are we going and why am I in this handbasket?

On Oct 11, 11:52*am, Scott M wrote:
geoff wrote:
I don't think that swelling up is much of a common problem - what causes
the rubber ball to swell? ... some pratt spraying it with WD40 ? I can't
see which proprietary additive would be absorbed by rubber

Fernox MB-1 used to, allegedly, but they've sorted that problem.

http://www.diynot.com/forums/viewtopic.php?p=624484

The inhibitor could/should stay in the system for several years, so
it may still show up.