| 摘要 |
Fire sprinkler head suitable for mounting in a concealed location in the ceiling in a residential dwelling which provides quick and automatic response in the event of a fire. The valve assembly in the sprinkler head is biased to the open mode and is maintained in the closed mode against a positive force, provided by at least the pressurized fire extinguishing fluid, tending to move the valve assembly to the open mode, by a valve closure unit which is separable into its two sections at the onset of a fire. The two sections of the valve closure unit are maintained intact as a unit by a heat responsive member until the ambient temperature causes a heat fusible alloy composition to melt whereby any resistance to separation of the divided valve closure unit is removed and the positive force against the valve assembly causes it to be moved to the open position at the same time causing the valve body member to be retracted from the sprinkler head outlet, and allowing discharge of the fire extinguishing fluid onto the fire.
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