Does monobloc mixer tap need a check valve?

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12 Dec 2010
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Wiltshire
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United Kingdom
Hi Guys

Was plumbing in the monobloc mixer tap on a new bathroom basin. Connected up the cold feed, thought I'd turn on the tap to see if it worked before I connected up the hot - and was surprised to get a lap full of water from the (not yet connected) hot pipe (the hot tap was "on").

This got me thinking - if both taps are on and one side of the system (either hot or cold) suffers a pressure drop for some reason, is there a risk if the hot water running in to the cold pipe or vice-versa? .... and if that does happen, is it a problem (they are both, after all, fed from the same header tank).

If it is a problem, does that mean I should install check valves? I would rather not as I have just installed the thing and I don't want to have to take it all apart again!!!

Just for clarification - the cold water is from a header tank in the loft, the hot water is from a standard water cylinder which is fed from the same header tank.
 
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its quite common to find check valves already build into the tails that come with the taps.
 

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