What is a common location for a sprinkler system OS&Y valve?

What is a common location for a sprinkler system OS&Y valve?

• A. In a Mechanical Room
• B. On the Service Side of the Water Meter
• C. In an Underground Service Box
• D. Outside Next to the Post Indicator Valve

Answer: (B)

OS&Y valves are the main shutoff for a sprinkler system, and they should be placed where you can quickly open or close them and clearly see whether they’re open or closed. A common location is on the service side of the water meter—that is, downstream from the meter toward the building. This puts the valve between the city’s supply and the building’s sprinkler main, allowing isolation of the sprinkler system without affecting the water supply to the street. It also tends to be located in an accessible spot near the meter or in a mechanical area, so responders or facility personnel can operate it quickly and verify its position. Other locations are possible in some setups, but placing the valve after the meter is the standard practice because of accessibility, visibility, and straightforward isolation of the sprinkler system.

OS&Y valves are the main shutoff for a sprinkler system, and they should be placed where you can quickly open or close them and clearly see whether they’re open or closed. A common location is on the service side of the water meter—that is, downstream from the meter toward the building. This puts the valve between the city’s supply and the building’s sprinkler main, allowing isolation of the sprinkler system without affecting the water supply to the street. It also tends to be located in an accessible spot near the meter or in a mechanical area, so responders or facility personnel can operate it quickly and verify its position. Other locations are possible in some setups, but placing the valve after the meter is the standard practice because of accessibility, visibility, and straightforward isolation of the sprinkler system.