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Motorised valve allowing water flow even though spindle closed

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Barry Clark

hi. I removed actuator from motorised valve. Spindle at 12 noon so valve should be closed. However hot is flowing through the valve. I can manually turn the spindle about 20 degrees. Is it possible the gland inside is not turning even though spindle is? Many thanks.
 
Barry Clark said:
hi. I removed actuator from motorised valve. Spindle at 12 noon so valve should be closed. However hot is flowing through the valve. I can manually turn the spindle about 20 degrees. Is it possible the gland inside is not turning even though spindle is? Many thanks.
Click to expand...

What model valve?

The most common ones IME are Honeywell and the ones I've dismantled have a 'rubber' ball on a crank that is rolled in front of the outlet to close the valve. It's a neat design that works well until it doesn't. You should be able to rotate the shaft with your fingers and 20° is about the normal range. Usual failure mode is the ball gets a dent in it and stops sealing reliably. You can buy a repair kit for about a tenner but I suspect that most people just replace the valve so the customer feels they've got something for their money most of which goes on the time to drain, refill and bleed the system. And then there's the Fernox tax...
 
time for a new valve and body

finding there only lasting 5-10 years (decent valve) could be less
 
Chuck said:
What model valve?

The most common ones IME are Honeywell and the ones I've dismantled have a 'rubber' ball on a crank that is rolled in front of the outlet to close the valve. It's a neat design that works well until it doesn't. You should be able to rotate the shaft with your fingers and 20° is about the normal range. Usual failure mode is the ball gets a dent in it and stops sealing reliably. You can buy a repair kit for about a tenner but I suspect that most people just replace the valve so the customer feels they've got something for their money most of which goes on the time to drain, refill and bleed the system. And then there's the Fernox tax...
Click to expand...

Thanks for quick response. It appears to be an older Drayton. It only says BGMVSP-2 on label but this Drayton replacement fits it perfectly: http://www.NoLinkingToThis/p/drayton-zone-replacement-valve-actuator/76959?_requestid=445491
I fitted it but still problem, hence my asking if it's possible the valve is damaged internally. The spindle turns but it never shuts off and from what you say it sounds like it's leaking even though closed.
 
drayton have a flapper, you will need to hold it in the shut position (as the flow will open it without the head on)

and tbh heads on there own arnt worth it, its only another £10 or less if your in the trade (about 38 + vat)
 
Ok. But even with the new head on it's still allowing hot water to flow to the CH if there is demand from the HW cylinder, so I guess it's leaking internally even though held closed by the actuator. It's mounted horizontally and is under the floor (had to take up floor tiles and boards to find) and it's at the lowest point of the system. Guess it could be silted up and so not closing fully? Will have to drain and replace with a new unit. Screwfix said they'd refund the head only. Thanks for your help.
 
Barry Clark said:
Ok. But even with the new head on it's still allowing hot water to flow to the CH if there is demand from the HW cylinder, so I guess it's leaking internally even though held closed by the actuator. It's mounted horizontally and is under the floor (had to take up floor tiles and boards to find) and it's at the lowest point of the system. Guess it could be silted up and so not closing fully? Will have to drain and replace with a new unit. Screwfix said they'd refund the head only. Thanks for your help.
Click to expand...

yea tbh normally best to change the body as well unless its under 5 years old, and thats good of them
 
Sorry, just had a thought. There is a small black lever on the Drayton actuator head. It seems to be locked in place and I'm not sure how to move it without breaking it? I guess it's meant to be the manual override for filling? There's nothing in the instructions about what it does or how to move it. Sorry, I must sound a bit stupid. Maybe I should get a Myson, as the valve for the HW Santon tank is Myson and its manual lever is just spring loaded.
 
Barry Clark said:
Sorry, just had a thought. There is a small black lever on the Drayton actuator head. It seems to be locked in place and I'm not sure how to move it without breaking it? I guess it's meant to be the manual override for filling? There's nothing in the instructions about what it does or how to move it. Sorry, I must sound a bit stupid. Maybe I should get a Myson, as the valve for the HW Santon tank is Myson and its manual lever is just spring loaded.
Click to expand...

If it's has a and b on a label above it, leave that one

There's one other end of the wire, you will see a hole in the centre put a small screwdriver in there and pull away from the body, should pop out easy and move
 
Yes, thanks, but I can't see anything in the instructions about moving it. Do you only unlock it for filling the system? The existing one is in the lock position so I guess that is "normal operation"? Can you just remove the actuator and manually turn the spindle for filling? What's the lock for? Sorry to keep asking all these questions. Trying to help save my son some money. :)

I wonder if I should get a Myson, they are expensive but just have a lever which slides over and springs back. Thanks so much for all your help.
 
You could take the head off for filling the spindle should be lose and easy to move. As mentioned earlier about 20 degrees.
 
Barry Clark said:
Yes, thanks, but I can't see anything in the instructions about moving it.
Click to expand...

On page 2 of the installer's guide:

"When the manual lever is moved to the right and pushed in to ‘lock’, the valve is open, it automatically releases when the valve is powered."
 
Hi. All Sorted your help was much appreciated. Discovered the drain valve near the motorised valves so just drained - only about 2 litres came out, rest stayed in system. No problems repressurising and restarting boiler. Thanks again. Barry
 
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