| 摘要 |
An improved water supply valve (1) for a fire installation where water is to be supplied through said water supply valve (1) in the event of fire, said water supply valve (1) including a sensor (11) external of the valve chamber which can magnetically sense the gate (3) of the valve (1) being closed and being usable to provide an alarm activating output signal therefrom in such circumstances, said sensor (11) being, in use, connectable to a fire installation to give an alarm indication in response to said output signal when the gate (3) is closed. |
