Cowboy special "Super plumbing tip"

Rhondo · 17 Oct 2010

How to convert a Myson 2 port (spring shut) valve to normally open.
Just finished this in my workshop as I need one for a job and noticed not many suppliers stock these.
Here I've drilled a new 3 mm hole for the valve shoes at right angles to the existing one...........

Here I've reinserted the shoe holding pin in its new location....

Here are the bits ready for assembly......

Hey presto the old previous spring shut motorized valve is now a spring open motorized valve after ten minutes work... ..

Well I think its genius if I do say so myself.

Has saved me ££££££££

petit_pablo · 17 Oct 2010

After draining, removing valve, dismantling, modifying, rebuilding, refitting and refilling, is it worth the effort?

picasso · 17 Oct 2010

Rhondo said:
Well I think its genius if I do say so myself.
Has saved me ££££££££

You have got far to much time on your hands

Paul Barker · 17 Oct 2010

How do you reverse the action of the synchron motor? Surely at the moment it is held open by the springs and motor action is also designed to open it. How do you shut it?

Rhondo · 17 Oct 2010

petit_pablo said:
is it worth the effort?

You make it sound very laborious petit.

I've just commissioned a huge solid fuel boiler integrated with an oil boiler and currently the oil boiler is rather partial to stealing a huge chunk of the flow from the sf boiler resulting in the sf boiler overheating.

I've just shut down one of the oil boiler circulator isolating valves at the moment.
Its all working rather well apart from this small problem.
I did have a few undersized pump problems initially but thats now resolved.
Customer is delighted.

There is a swing check valve in place fitted vertically and so far I'm looking at it as being the culprit.
At first I though it was gravity circulation but the moment the iso valve is cracked open ever so slightly the flow surges through the oil boiler.

I'll be taking the laborious route of draining, removing (swing check valve) , dismantling, modifying,(changing if necessary) rebuilding, refitting and refilling and then if this doesn't work my custom built n/o valve will be fitted.

Rhondo · 17 Oct 2010

Paul Barker said:
How do you reverse the action of the synchron motor? Surely at the moment it is held open by the springs and motor action is also designed to open it. How do you shut it?

The synchron motor works as normal. The spring opens the valve ,electric shuts it..The spindle revolves 360 degrees.
I've just tested it and it works superbly. Though the manual operation does not shut the valve as it only seems to go through a half stroke.

Gasguru · 17 Oct 2010

Lets just hope the spindle o ring survives this ordeal

I hate all those shoe valves...the spindles always sieze or the o ring weeps at some stage...flawed design with all that rotation on the ring.

Paul Barker · 17 Oct 2010

Rhondo said:
The synchron motor works as normal. The spring opens the valve ,electric shuts it..The spindle revolves 360 degrees.
I've just tested it and it works superbly. Though the manual operation does not shut the valve as it only seems to go through a half stroke.

Oh yes, I see.

twgas · 17 Oct 2010

Could you have not removed securing screws, rotated internals 90°, refit screws

. It may not work, I've never tried it.

Rhondo · 17 Oct 2010

Gasguru said:
Lets just hope the spindle o ring survives this ordeal

I hate all those shoe valves...the spindles always sieze or the o ring weeps at some stage...flawed design with all that rotation on the ring.

The rotation is entirely within the spindle shaft.
What seals are in there I don't know as I didn't disassemble that part but I see your point about seals wearing out.

Rhondo · 17 Oct 2010

twgas said:
Could you have not removed securing screws, rotated internals 90°, refit screws . It may not work, I've never tried it.

Yeah I think you're right.
There's a locater dimple on the base plate which could be grinded off and then the actuater head turns 90 degrees.

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Cowboy special "Super plumbing tip"

Rhondo

petit_pablo

picasso

Paul Barker

Rhondo

Rhondo

Gasguru

Paul Barker

twgas

Rhondo

Rhondo

DIYnot Local

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