What is the function of a post-indicator valve (PIV) in a sprinkler system?

• A. It indicates the valve position remotely to assist in status verification during operation and maintenance.
• B. It regulates system pressure to design level.
• C. It increases water flow during a fire event.
• D. It filters debris from the water line.

Answer: (A)

Knowing the valve’s status from a distance is what a post-indicator valve provides. The indicator post moves with the valve stem, giving a clear remote signal of whether the main sprinkler shutoff is open or closed. This makes it easy to verify during operation and maintenance that water can reach the system when needed and that the valve isn’t inadvertently left closed. It doesn’t regulate pressure, boost flow, or filter debris—those functions come from other components in the system.