The “Floor Control Valve Assembly for Wet Pipe Systems” drawing that appears in the current edition of NFPA 13, Chapter 8, has remained unchanged for as long as most of us can remember. However, even though this drawing has remained unchanged, the “Floor Control Assembly and Inspector’s Test Loop” has gone through a number of evolutionary changes. The “Inspector’s Test Loop” was the first part of the “Floor Control Valve Assembly” to evolve. As drawn, it has 15 pieces and 19 connection points and is designed to allow for that branch to be tested to the flow of one sprinkler and to be drained if needed for maintenance or service.
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