Combining Hot and Cold Supply Lines

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NSono21

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Is it against code to combine a hot and cold supply line into a tee, and then run a single line to a plumbing fixture? I know this is an odd question, but I actually have a need for this.

If this is a code violation, what if I put a check valve in between both the hot and cold supply lines before combining them? Would this be considered within code?
 
You can use a commercially available mixing valve. Any other set-up will work if you do not mind having only warm water coming out of every faucet in your home...
 

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