Which valve provides a visual indication of the open or shut status on underground water mains?

Which valve provides a visual indication of the open or shut status on underground water mains?

• A. Post Indicator Valve - PIV
• B. OS&Y
• C. Sprinkler
• D. Riser

Answer: (A)

Post Indicator Valve (PIV) is designed to give a clear, surface-visible cue of the underground valve’s position. The valve sits underground, but a post above ground carries a visible indicator that shows whether the valve is open or shut. This lets firefighters and water staff quickly verify and operate the valve from the surface without digging, which is crucial during emergencies and routine operations. Outside Stem and Yoke valves also indicate position via the stem, but they don’t provide a dedicated surface-visible indicator for underground mains like a PIV does, and their indication can be less intuitive in practice. The sprinkler and riser components are not valves with surface-position indicators, so they don’t meet the requirement of showing open/shut status from above ground.

Post Indicator Valve (PIV) is designed to give a clear, surface-visible cue of the underground valve’s position. The valve sits underground, but a post above ground carries a visible indicator that shows whether the valve is open or shut. This lets firefighters and water staff quickly verify and operate the valve from the surface without digging, which is crucial during emergencies and routine operations.

Outside Stem and Yoke valves also indicate position via the stem, but they don’t provide a dedicated surface-visible indicator for underground mains like a PIV does, and their indication can be less intuitive in practice. The sprinkler and riser components are not valves with surface-position indicators, so they don’t meet the requirement of showing open/shut status from above ground.