A Device that Auto Shuts Domestic During a Fire?

NFPA 13R Section 9.3.1 talks about accounting for domestic flow "unless provisions are made to prevent the domestic waterflow on sprinkler system activation."

We have a low-rise apartment building that is four stories tall, under NFPA 13R. The sprinkler system can be supplied via a 6-inch service from a nearby main, but when domestic (2" or 2 1/2") is added it would require an expensive run to a remote main and an 8-inch service.

The MEP engineers are sort of shrugging at questions and would love to be paid to entirely re-design the system unless we tell them what to do/use. I don't know the correct terminology to find the elements of a system that would cut off the domestic tap when the fire system activates.

What is that called in the trade?

Am I correct in understanding that the sprinkler system has a flow sensor that activates when a sprinkler flows water, and this would then trigger alarms and as part of that, do something like activate a solenoid valve cutting off the domestic tap? 

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