3 way valve horror
 

35 year old 3 way valve had stripped its gearteeth, so the head was replaced with an identical one. Or so I thought. The new one won't work though, it stays on HW only all the time. Taking the head off reveals that the socket that engages onto the valve shaft sits at a different angle, so that at one end of the head's travel, the valve is at the other end of its travel. Hence any control of the valve is impossible, it sits at one end only. Any ideas before I copy Simon?


NT

3 way valve horror
 

3 way valve horror
 

On Sunday, 29 January 2017 13:09:46 UTC, tabby wrote:

35 year old 3 way valve had stripped its gearteeth, so the head was replaced with an identical one. Or so I thought. The new one won't work though, it stays on HW only all the time. Taking the head off reveals that the socket that engages onto the valve shaft sits at a different angle, so that at one end of the head's travel, the valve is at the other end of its travel. Hence any control of the valve is impossible, it sits at one end only. Any ideas before I copy Simon?


NT

Looks like I was wrong, the fitted valve moves a lot less angle than the replacement base that didn't get fitted. So probably full of crud & a draindown required.


NT

3 way valve horror
 

On Sunday, 29 January 2017 15:26:30 UTC, Bob Minchin wrote:
tabbypurr wrote:

35 year old 3 way valve had stripped its gearteeth, so the head was replaced with an identical one. Or so I thought. The new one won't work though, it stays on HW only all the time. Taking the head off reveals that the socket that engages onto the valve shaft sits at a different angle, so that at one end of the head's travel, the valve is at the other end of its travel.. Hence any control of the valve is impossible, it sits at one end only. Any ideas before I copy Simon?


NT

When I had one that failed (2way) it was the motor pinion that had
dental decay and so a new motor sorted it out. It only has about 8 teeth
and so much more subject to wear

If your gear wear is elsewhere then you might have to bite the bullet
and fit a new valve. Sometimes there are new valve bodies on ebay to go
with your replacement head to save buying a whole new valve.

That's what was done. And I explained why it hasn't worked.


NT

3 way valve horror
 

3 way valve horror
 

3 way valve horror
 

Bob Minchin wrote:

wrote:
On Sunday, 29 January 2017 15:26:30 UTC, Bob Minchin wrote:
tabbypurr wrote:

35 year old 3 way valve had stripped its gearteeth, so the head was
replaced with an identical one. Or so I thought. The new one won't work
though, it stays on HW only all the time. Taking the head off reveals
that the socket that engages onto the valve shaft sits at a different
angle, so that at one end of the head's travel, the valve is at the
other end of its travel. Hence any control of the valve is impossible,
it sits at one end only. Any ideas before I copy Simon?


NT

When I had one that failed (2way) it was the motor pinion that had
dental decay and so a new motor sorted it out. It only has about 8 teeth
and so much more subject to wear

If your gear wear is elsewhere then you might have to bite the bullet
and fit a new valve. Sometimes there are new valve bodies on ebay to go
with your replacement head to save buying a whole new valve.

That's what was done. And I explained why it hasn't worked.


NT

Correct me if I'm wrong but I think you might have changed the whole
head and integral gearbox. The individual motors within the heads are
also available as spares on ebay for £10-12 IIRC and should work as I
explained. You then can retain the old gear head with its particular
spigot arrangement.

But this is perhaps less useful when, as in this case, the problem is
stripped gear teeth rather than motor failure.


--

Roger Hayter

3 way valve horror
 

On 29/01/2017 18:16, Roger Hayter wrote:
Bob wrote:



Correct me if I'm wrong but I think you might have changed the whole
head and integral gearbox. The individual motors within the heads are
also available as spares on ebay for £10-12 IIRC and should work as I
explained. You then can retain the old gear head with its particular
spigot arrangement.

But this is perhaps less useful when, as in this case, the problem is
stripped gear teeth rather than motor failure.



It depends on which teeth have stripped. There is a small gear on the
output of the motor assembly. If the teeth on that have stripped, a new
motor will replace them.

This small gear drives a larger (partial) gear connected to the valve.
If *its* teeth have stripped, a new motor won't fix it.
--
Cheers,
Roger
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Please reply to Newsgroup. Whilst email address is valid, it is seldom
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3 way valve horror
 

On Sunday, 29 January 2017 18:58:55 UTC, Roger Mills wrote:
On 29/01/2017 18:16, Roger Hayter wrote:
Bob wrote:

Correct me if I'm wrong but I think you might have changed the whole
head and integral gearbox.

yes

The individual motors within the heads are
also available as spares on ebay for £10-12 IIRC and should work as I
explained. You then can retain the old gear head with its particular
spigot arrangement.

But this is perhaps less useful when, as in this case, the problem is
stripped gear teeth rather than motor failure.



It depends on which teeth have stripped. There is a small gear on the
output of the motor assembly. If the teeth on that have stripped, a new
motor will replace them.

This small gear drives a larger (partial) gear connected to the valve.
If *its* teeth have stripped, a new motor won't fix it.

The problem has nothing to do with gear teeth or motor. The movement of the valve itself has become very restricted. So drain down & clean out seems the only option. If it turns out there is a persisting compatibility problem, hopefully I can fit the new base, which I still have, to match the new head. I hate plumbing.


NT

3 way valve horror
 

On 30/01/17 00:35, wrote:
The movement of the valve itself has become very restricted.

I had this. Suspect it was crap build up in some new plimbing

Took the motor off and used mole grips to work the valve body till it
freed up.

Fitted a new motor head and its still working


--
"When one man dies it's a tragedy. When thousands die it's statistics."

Josef Stalin

3 way valve horror
 

Kind of makes you wonder though, why they might want to redesign something
that has already been made for years.
Brian

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"Bob Minchin" wrote in message
...
wrote:
35 year old 3 way valve had stripped its gearteeth, so the head was
replaced with an identical one. Or so I thought. The new one won't work
though, it stays on HW only all the time. Taking the head off reveals
that the socket that engages onto the valve shaft sits at a different
angle, so that at one end of the head's travel, the valve is at the other
end of its travel. Hence any control of the valve is impossible, it sits
at one end only. Any ideas before I copy Simon?


NT

When I had one that failed (2way) it was the motor pinion that had dental
decay and so a new motor sorted it out. It only has about 8 teeth and so
much more subject to wear

If your gear wear is elsewhere then you might have to bite the bullet and
fit a new valve. Sometimes there are new valve bodies on ebay to go with
your replacement head to save buying a whole new valve.