| 摘要 |
A fire hydrant having a generally elbow-shaped hydrant shoe with an improved interior bowl configuration and an improved hydrant valve for minimizing head or flow loss of the fire hydrant between the inlet opening of the shoe and the outlet nozzle positioned on the upper portion of the hydrant barrel. The interior bowl of the shoe, adjacent its inlet, is provided with a diverging transitional surface of rotation having a generally part frusto conical shape and, adjacent its outlet, is provided with a converging transitional surface of rotation having a generally part frusto conical shape, the transitional surfaces of rotation merging with the shoe's part spherical chamber. The valve element of the hydrant valve is provided with a generally conically shaped converging surface on its downstream side which when open defines with said converging transitional surface of rotation and with a portion of said diverging surface of rotation an annular passage for the flow of fluid through the hydrant shoe into the hydrant barrel, the annular passage varying in radial section from a diverging radial section to a converging radial section.
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