On 23/04/2019 21:27, newshound wrote:
On 22/04/2019 22:16, wrote:
On Monday, 22 April 2019 22:01:53 UTC+1, newshoundÂ* wrote:
On 22/04/2019 19:21, tabbypurr wrote:

Honeywell 3 way valve for plan Y. It's shaft was very stiff, I've
freed it by waggling but need to disassemble & replace the rubber
seal otherwise the problem will just recur.

This is the plate carrying the shaft & ball:
http://i63.tinypic.com/drco5l.jpg

Have removed circlip from topside of shaft, and assumed the shaft
would then drop out the bottom. But no joy, even hammering down on
it fairly firmly it won't budge. The bottom end of the shaft is
peened to the arm carrying the ball, so I'm asking if there's a way
to remove it but suspect the worst. I assume it must be
disassemblable somehow, but I'm not seeing how.

If it proves impossible, I'm thinking of trying forcing grease into
the thing from the top using a grease gun & flexible tube clamped
on. Is there any particular grease that would stay in place longest?
It's under 2 storeys of water pressure, and runs primary circuit hot
water upto 80 degrees C.

Cheers


NT

I don't think grease will work. I imagine the problem is something like
limescale or magnetite taking up all the clearance around the spindle on
the "water" side.

We won't really know unless I get the thing apart, which looks
unlikely. I read elsewhere that the problem was a rubber O ring
failing, resulting in water getting to the shaft & causing corrosion.
But if it's not dismantlable do they in fact know that. Either way the
thing moves ok now, I just need to grease it to (I hope) keep the
water away from it for a fair while. Obviously disassemble & new O
ring would be a lot better.

I already bought a replacement, but it was faulty & is going back, so
I thought I'd see if it's fixable.


NT

Assuming the replacement won't take long, for a temporary fix I would be
soaking the whole lot in penetrating oil to get the friction down, and
not worrying about a bit of leakage. Grease is not going to prevent that
anyway, with two bar behind it.

Correction, a bit less than one bar if it's two storeys.