To water flow test a sprinkler system what is used?

• A. Flow meter
• B. Testing hydrant
• C. Inspectors Test Valve
• D. Main control valve

Answer: (C)

The test uses a dedicated test outlet known as the inspector’s test valve. This valve is specifically installed to create a controlled discharge path for a water flow test, allowing you to simulate sprinkler-demand flow while the rest of the system remains in service. Opening the inspector’s test valve provides a measured flow through the test line, so you can verify that the water supply can deliver the required flow and that the system components respond correctly. The other items aren’t used for this purpose: a flow meter measures flow but doesn’t provide the test path itself, a testing hydrant may be used for external supply checks in some cases but not the sprinkler system’s standard flow test, and the main control valve simply shuts off or resumes water to the entire system rather than enabling a focused flow test.