A fire protection system water supply valve in which the stem protrudes from the housing when the valve is shut, making the valve condition readily apparent, is known as what?

• A. Outside stem & yoke valve
• B. Angle valve
• C. Globe valve
• D. Ball valve

Answer: (A)

The main idea is having a valve that clearly shows its position at a glance. An outside stem and yoke valve is designed so the stem projects from the bonnet, and in the closed position the stem sticks out, making the valve’s status readily visible. This visual indication is crucial in fire protection systems, where quickly confirming whether a control valve is open or shut can affect response and safety. Other valve styles may not provide this immediate external cue, since their stems may be flush or not clearly indicating position, so they don’t meet the requirement described as well.