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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Taps and water pressure
Last Saturday, I spoke to the man behind the counter, of the place where
I am going to buy my wash hand basin and loo. He tells me that the modern quarter turn taps can be difficult when supplied with low pressure water. Water getting from the hot supply to the cold, or the other way round. A plumber told me today, that they should work fine on tank fed water. Who do I believe? Dave |
#2
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Taps and water pressure
On Tue, 7 Feb 2006 18:51:56 +0000 (UTC), Dave wrote:
A plumber told me today, that they should work fine on tank fed water. They will work, but unless you have a good head, the flow may not be very good - some don't open as far as conventional taps. The bit about hot & cold mixing is nonsense, unless your feeds are at different pressures. -- Nigel M |
#3
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Taps and water pressure
Nigel Molesworth wrote:
On Tue, 7 Feb 2006 18:51:56 +0000 (UTC), Dave wrote: A plumber told me today, that they should work fine on tank fed water. They will work, but unless you have a good head, the flow may not be very good - some don't open as far as conventional taps. OK on that. I can understand it if the orifice is smaller than the taps I have been used to. Kitchen mixer is much the same, but this tap is fed from a smaller bore pipe than usual. The bit about hot & cold mixing is nonsense, unless your feeds are at different pressures. I didn't like to press this home, as I had just agreed £27-00 discount per set from him :-) Dave |
#4
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Taps and water pressure
On Tue, 7 Feb 2006 22:27:16 +0000 (UTC), Dave wrote:
Kitchen mixer is much the same, but this tap is fed from a smaller bore pipe than usual. Kitchen taps are generally not "mixers" they just look like them. Normally the water goes up separate channels to the spout. -- Nigel M |
#5
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Taps and water pressure
In an earlier contribution to this discussion,
Dave wrote: Last Saturday, I spoke to the man behind the counter, of the place where I am going to buy my wash hand basin and loo. He tells me that the modern quarter turn taps can be difficult when supplied with low pressure water. Water getting from the hot supply to the cold, or the other way round. A plumber told me today, that they should work fine on tank fed water. Who do I believe? Dave Some modern taps have very poor flow rates when fed with tank pressure rather than mains pressure. If you're feeding a tap with cold water at mains pressure and hot water at tank pressure, it's important that the hot and cold have independent paths all the way to the discharge nozzle - rather than mixing further back in the tap. Maybe this was what the man behind the counter was saying? If the mixing takes place further back, the mains pressure cold can push the low pressure hot *backwards* up the feed pipe. I think you're supposed to fit double check valves to prevent that sort of thing anyway - but I'm not sure how many people do! -- Cheers, Roger ______ Please reply to newsgroup. Reply address IS valid, but is disposable in the event of excessive spam. |
#6
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Taps and water pressure
Dave wrote:
Last Saturday, I spoke to the man behind the counter, of the place where I am going to buy my wash hand basin and loo. He tells me that the modern quarter turn taps can be difficult when supplied with low pressure water. Water getting from the hot supply to the cold, or the other way round. A plumber told me today, that they should work fine on tank fed water. Who do I believe? I have seen quarter turn taps that dripped when turned off holding back low presure tank fed water. However once the pressure was raised (shower pump) they shut off perfectly. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#7
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Taps and water pressure
John Rumm wrote: I have seen quarter turn taps that dripped when turned off holding back low presure tank fed water. However once the pressure was raised (shower pump) they shut off perfectly. FWIW I've a quarter turn tap which is the exact opposite1 Regards Capitol |
#8
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Taps and water pressure
Roger Mills (aka Set Square) wrote:
Some modern taps have very poor flow rates when fed with tank pressure rather than mains pressure. Noted, thanks. If you're feeding a tap with cold water at mains pressure and hot water at tank pressure, it's important that the hot and cold have independent paths all the way to the discharge nozzle - rather than mixing further back in the tap. Maybe this was what the man behind the counter was saying? That sounds about right from memory. If the mixing takes place further back, the mains pressure cold can push the low pressure hot *backwards* up the feed pipe. I think you're supposed to fit double check valves to prevent that sort of thing anyway - but I'm not sure how many people do! The counter man mentioned this as well. Many thanks for your input to my question. It looks like I will have to as at the plumbing supplier. Regards Dave |
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