hj said:Your basic mistake is assuming that the valve are "full size" so all the water in a 1/2" pipe is going into the tub. Most valves have openings which are much, much smaller than 1/2" diameter, so the flow from each of them will be less than a 1/2" pipe, but combined they may equal a "full sized" 1/2" pipe and more than a 1/2" PEX line, which is really only about 3/8", and if you remember your geometry, reducing the diameter of a circle causes an IMMENSE reduction in the area and thus the volume.
OldPete said:So you're saying the restriction occurs at the valve. If the orifice at the valve is much smaller and then it "opens" again to 1/2" (at tubing) -- then why would it matter?
This is awkward, but...
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