The inspector’s test valve is a vital component of any wet fire sprinkler system. At the heart of this connection is the test orifice. A small but critical feature that certifies the system’s waterflow alarm functions correctly. Both NFPA 13 (Installation of Sprinkler Systems) and NFPA 25 (Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems) provide requirements that govern the size, purpose, and functionality of this orifice.
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