How do compression type dry barrel hydrants open?

Compression type dry barrel hydrants are designed to open by moving the operating stem, which is situated in the barrel of the hydrant. The correct operation involves turning the nozzle, which lifts the valve mechanism located at the base of the hydrant against the flow of water. This configuration is specifically designed to ensure that when the hydrant is opened, water is allowed to flow freely into the piping system while maintaining a solid seal against backflow when it is closed.

Opening against the flow of water allows the hydrant to prevent water from spilling or creating a hazardous situation when the hydrant is being activated. This mechanism also minimizes the risk of water freezing in the barrel during cold temperatures, as it ensures that the water is being directed away from the hydrant’s operational components. The design and operation of such hydrants make them reliable and safe choices for fire protection in varying environmental conditions.

The other options describe methods that are not applicable to compression type dry barrel hydrants, which is why they do not accurately reflect the operation of this particular hydrant style. For instance, turning a valve in the base does not describe the action taken in this type of hydrant, and there is no hand-activated lever involved in their operation. Additionally, automatic opening