Where is the main operating valve located in a dry barrel hydrant?

The main operating valve of a dry barrel hydrant is located in the base. This design is crucial for the hydrant's operation, especially in climates where freezing conditions are a concern. By placing the valve at the base, the hydrant can drain completely when it is closed, preventing water from remaining in the barrel and potentially freezing.

When the hydrant is not in use, the valve remains shut, and any water that may have been in the barrel flows out through weep holes at the bottom. This prevents ice formation that can damage the hydrant. Therefore, it's essential for the valve's location to facilitate proper drainage and ensure the device remains functional and safe during cold weather conditions.

In contrast, locating the valve in other areas, such as at the top or in the barrel itself, would not allow for complete drainage, increasing the risk of freeze damage and limiting the effectiveness of the hydrant.