What does the post-indicator valve (PIV) indicate in a sprinkler system?

What does the post-indicator valve (PIV) indicate in a sprinkler system?

• A. Whether the valve is open or closed
• B. The water temperature
• C. The water pressure
• D. The age of the system

Answer: (A)

The post-indicator valve tells you the valve’s position—whether it is open to allow water flow or closed to stop it. This visual indication is built into the valve body so anyone can quickly confirm if the sprinkler system main is isolating a section or allowing flow. Knowing the exact state of the valve is crucial during maintenance, testing, or an emergency, because it tells you if water can reach the system or if a line is currently shut off. The indicator does not convey temperature, pressure, or the age of the system; those details come from other instruments or records.

The post-indicator valve tells you the valve’s position—whether it is open to allow water flow or closed to stop it. This visual indication is built into the valve body so anyone can quickly confirm if the sprinkler system main is isolating a section or allowing flow. Knowing the exact state of the valve is crucial during maintenance, testing, or an emergency, because it tells you if water can reach the system or if a line is currently shut off. The indicator does not convey temperature, pressure, or the age of the system; those details come from other instruments or records.