UL FM DRY BARREL FIRE HYDRANT
Dry Barrel Fire Hydrant
Dry barrel hydrants get their name from the fact that water is drained or pumped from the barrel when the hydrant is not in use. Dry barrel hydrants are pressurized and drained through the workings of a main valve located in the base of the hydrant. When the main valve is opened, the barrel is pressurized; when the main valve is closed the barrel drains. This type of hydrant may be used almost anywhere, but is especially suited to areas where freezing weather occurs.
In a dry barrel hydrant, a single main valve is located in the base of the hydrant adjacent to the inlet connection. In addition, the dry barrel hydrant is equipped with an automatically operated drain valve. When the main valve is closed, the drain valve automatically opens, draining all water from the barrel of the hydrant. When the hydrant is opened, the drain valve automatically closes. The main valve is located below the normal frost line to protect the hydrant from freezing. This allows the dry barrel hydrant to be used almost anywhere.