What is the purpose of an Outside Screw and Yoke?

• A. It Allows Water Into The Sprinkler System
• B. It Seals The System
• C. It Drains The System
• D. It Monitors Water Pressure

Answer: (A)

Outside Screw and Yoke valves place the stem and operating nut on the outside of the valve, so you can see exactly where the valve is in the open or closed position. The vertical movement of the stem as the valve is turned provides a clear, at-a-glance indication of whether water can flow, which is crucial during emergencies when you need to quickly verify that the supply valve is fully open before charging a standpipe or sprinkler system. This design also makes it easier to operate from outside the valve and, in many cases, to padlock or secure the valve to prevent unauthorized changes.