Astra
Full Member
Posts: 219 
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Post by Astra on Aug 23, 2022 19:35:48 GMT
Hi Guy's I have a customer who lives in a two up two down cottage Now they have a bath mixer shower tap,, when they use the shower attachment water pours out of the overflow like mad .........I looked at it today and found this tap has cold water mains connection and only normal Hot water service ( Gravity ) so the cold water is pushing the Hot water back up into the cold water storage tank then overflowing so my only way I can see to stop this is to fit a Non Return Valve on the Hot pipe down service .......Now Ideally it should be fitted where the tap is but Non Accessible so the only place I can see to fit this is the airing cupboard Can you please look at attached photo of my poor drawing where I show my Proposed position just to confirm my thoughts thank you............  |
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Post by rocketmanbkk on Aug 23, 2022 20:05:31 GMT
Are non return valves full bore?
You don’t want the hot pressure becoming worse due to its position hence why close me to the offending tap would be better.
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Post by tomplum on Aug 23, 2022 20:29:55 GMT
I agree with rocky, I have had this situation and I have put a ball o fix valve on the cold water pipe just before the bath tap, this will restrict the flow of cold to the mixer tap, adjust as necessary
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Post by crowsfoot on Aug 24, 2022 8:35:46 GMT
#3 plumber agrees with all the above  . You could try fitting an adjustable pressure reducing valve on the cold main just below the cold bath tap (which is a more modern take on toms idea). Bear in mind though that the mains pressure does fluctuate at different times during the day.I've seen more than enough connected up this way though in my plumbing time (even though it infringes the water bylaws). Could you lower the water level in the storage tank (via the ball valve) so that it can take up the extra water without overflowing? There's not really a correct answer to this one Astra and you may be better just telling the customer just to do what rocky said in his post. NB. I can once remember getting an early 3:00am call-out to water "gushing out of tank". The householder had fitted a pair of those dreadful "telephone shower taps" earlier that same day doing just this - then he had a shower after getting in from doing shift work in the early hours. He had already turned the water off when I arrived and took me to the storage tank located in the airing cupboard and pointed to the expansion pipe saying "that's where tank is filling from"!! It's the many many jobs just like this that make me so glad that I'm now retired and I'm not going to get the silly call-outs like these ever again!! |
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Post by rocketmanbkk on Aug 24, 2022 14:08:29 GMT
I agree with rocky, I have had this situation and I have put a ball o fix valve on the cold water pipe just before the bath tap, this will restrict the flow of cold to the mixer tap, adjust as necessary A gate valve would also be ok I think as you could then balance the cold but it has to be close to the tap. |
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Astra
Full Member
Posts: 219
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Post by Astra on Aug 25, 2022 18:32:15 GMT
Hi Guy's many thanks for the replies I agree with you all ............................. My biggest problem is I just can not get to the tap it is definitely inaccessible all pipework is 22mm if I cut the pipe I can see in the cupboard there is definitely no movement in the pipework to pull apart to get a valve in .............also the pipe I can see is only a short length so I cannot even cut out a large section then fit a valve then refit a new piece of pipe and joint it with a slipper compression joint so I don't know or cannot see another way round this one, as this pipe then just disappears in the brick work after that..................  |
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Post by tomplum on Aug 25, 2022 20:24:13 GMT
Thats plumbing for you astra, Its a bugger, Putting the none return on the hot feed might not stop it because, it might still feed back through the cold feed to the cylinder or another tap, If you can't see the pipework, you need to control the cold inlet at a point you can get at, or walk away,  |
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Post by crowsfoot on Aug 25, 2022 21:04:44 GMT
I can also see the higher pressured cold water cutting off the lower pressured hot supply at the non return valve (if it's ever fitted) resulting in a cold shower every time!
The idea's a no goer Astra!
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Post by pb on Aug 26, 2022 22:19:49 GMT
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Post by dickpuller on Aug 27, 2022 6:44:53 GMT
15mm mate, so would greatly restrict the HW flow, but it could work. Generally designed for showers, 10-12Ltr/min. |
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