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

In a dry barrel hydrant, the main operating valve is located in the base. This design is primarily for the purpose of preventing water from freezing in the hydrant during colder temperatures. When the hydrant is operated, water flows from the main distribution system into the hydrant, and after the hydrant is closed, water drains out through weep holes to ensure that the barrel remains dry and free from ice.

By situating the main valve in the base, the water supply can be shut off securely while allowing any remaining water in the hydrant barrel to drain out. This critical feature ensures that the hydrant remains functional in winter conditions, as it eliminates the risk of frozen water damaging the hydrant components. This design is particularly advantageous in maintaining reliable fire hydrant operation, ensuring accessibility and reliability in emergency situations.