A threaded stem indicates the valve position on which sprinkler control valve?

A threaded stem indicates the valve position on which sprinkler control valve?

• A. Outside Stem and Yoke
• B. Post Indicator
• C. Gate
• D. Butterfly

Answer: (A)

Reading valve position on sprinkler control valves is done by looking at how the stem is arranged. A threaded stem is a hallmark of an Outside Stem and Yoke valve. In this type, the stem sits outside the valve body and moves with the gate; as the valve opens, the stem rises and the threaded portion is visible above the yoke, making it easy to tell whether the valve is open or closed just by the stem’s position. Other valve types use different indicators—for example, a post indicator valve has a separate indicator post, not a threaded stem, while gate and butterfly valves may not rely on a threaded stem to show position. Therefore, a threaded stem signals an Outside Stem and Yoke valve.

Reading valve position on sprinkler control valves is done by looking at how the stem is arranged. A threaded stem is a hallmark of an Outside Stem and Yoke valve. In this type, the stem sits outside the valve body and moves with the gate; as the valve opens, the stem rises and the threaded portion is visible above the yoke, making it easy to tell whether the valve is open or closed just by the stem’s position. Other valve types use different indicators—for example, a post indicator valve has a separate indicator post, not a threaded stem, while gate and butterfly valves may not rely on a threaded stem to show position. Therefore, a threaded stem signals an Outside Stem and Yoke valve.