Doulbe Check Valves or Just service Valves

bernieboy · 23 Aug 2006

Hi all, I am installing a small sink with a monobloc mixer tap. The instructions say that the hot and cold supplies should be of equal pressure; ie: both from tanks, and not using the cold from the rising main, and that double check valves should be installed close to the tap. Firstly is this correct and secondly are double check valves service valves as well.

any advice appreciated greatly!

bster · 23 Aug 2006

check valves are not service valves as well.

and if the instructions say what they say, then follow them - nobody knows the product better than the people who design,make and market them.

Though i dont see the point in check valves if the supplys are balanced!

Softus · 23 Aug 2006

I can't think of one reason why you would install a check valve when the supply is higher than the tap - how could it ever backflow?!

Agile · 23 Aug 2006

I can and in any case its required under the water regulations if its mains fed.

Tony

Softus · 23 Aug 2006

duplicate post deleted

Softus · 23 Aug 2006

Agile said:
I can and in any case its required under the water regulations if its mains fed.

bernieboy said:
both from tanks, and not using the cold from the rising main

Er, so how can it backflow Agile?

corgiman · 24 Aug 2006

Softus said:
Agile said:

I can and in any case its required under the water regulations if its mains fed.

Click to expand...

bernieboy said:

both from tanks, and not using the cold from the rising main

Click to expand...

Er, so how can it backflow Agile?

By syphanage soft

in the unlikely even that the mains is turned off and opened thereis a minuscule chance that the grade 2 water could be syphoned back into mains

Thats what I was told anyway

as we do have this magic water that can leap from the sink into the tap and start syphoning

if you listern closely you can here the tiny sounds of men in suits making stuff up to justify thier wages

Softus · 24 Aug 2006

corgiman said:
Er, so how can it backflow Agile?

Click to expand...

By syphanage soft

I think you've got the wrong end of the stick - I do know about syphonage cm.

in the unlikely even that the mains is turned off and opened thereis a minuscule chance that the grade 2 water could be syphoned back into mains

...which is why there should be a check valve on the mains supply. however, Agile was asserting that there needed to be check valves on the tank-fed hot and cold supplies to the basin.

as we do have this magic water that can leap from the sink into the tap and start syphoning

It has more to do with garden hoses, and any float valve that stands a remote chance of getting immersed in water.

corgiman · 24 Aug 2006

like the man in orthopedic shoes I stand corrected

diynot

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Doulbe Check Valves or Just service Valves

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