| 摘要 |
A recreational spray device is adapted to be installed on a conventional fire hydrant and comprises spray passage means and a spray valve. The spray passage means is connected at one end to the hydrant inlet and has a spray head at its other end. The spray passage means is arranged so that the spray device is operable even though the main hydrant valve is closed. The spray valve controls the flow in the spray passage means and is normally closed, but the spray valve may be manually opened and will automatically close after a period of time. Thus, the spray device uses only a small amount of water and prevents an excessive pressure drop in the hydrant water system.
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