Kitchen sink pull down spray taps

Joined
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Hull
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Are these usually single flow? Mix in the tap body. Or dual flow?
 
Thanks I have one to do mains cold and gravity hot. Would need a single check valve on both supplies?
 
Or just the cold as it's protecting the cold mains? Will only have 0.5 of pressure on the hot side.
 
Taking the regs into account then it would really be a double check valve, if the spout can reach down into the water in the sink and that water could contain cleaning/disinfecting agents (CAT3).
 
Need a low pressure one, need to look at the tap specifications.
 
This is the tap
 

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The hot water flow isn't gonna be great if gravity fed with that type of tap
 

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