Question

OS&Y valves (Outside Stem/Screw and Yoke) are installed at several locations on a standpipe and sprinkler system, and can be used to shut down just part of the system when scheduled work is taking place. If the stem is flush with the control wheel the valve is:

Answer 1

OS&Y valves indicate their status by the position of the stem in relation to the control wheel. A stem flush with the control wheel signifies that the valve is open, allowing water to flow through the system.

Step-by-step explanation:

When working with OS&Y valves (Outside Stem/Screw and Yoke) in a standpipe and sprinkler system, the position of the stem relative to the control wheel indicates whether the valve is open or closed. If the stem is flush with the control wheel, the valve is in the open position. This means that water is allowed to flow through that section of the system. It's important that OS&Y valves are visibly discernible when open or closed for maintenance and emergency purposes. When the stem is visible and protrudes out, that indicates the valve is closed and no water flow is permitted through that part of the system. This design feature allows for easy identification of the valve's status, which is crucial during scheduled work as well as emergencies.