| 摘要 |
<p>The float valve ( 11 ) controls water level e.g. in an associated plant pot. A housing ( 21 ) has a water inlet ( 25 ) with an inlet port ( 26 ), a float ( 31 ) able to rise and fall with the level of the water in the housing ( 21 ), a valve operating mechanism ( 60 ) able to open and close the port ( 26 ), and an actuator means ( 40 ) to operate the valve operating mechanism when the float ( 31 ) rises and falls to predetermined levels. For opening and closing the inlet port ( 26 ), there is a valve operating mechanism comprising a valve operator ( 60 ) having a valve member ( 67 ) and a lever ( 61 ) mounted for pivoting movement about generally central pivot point ( 65 ). Actuator means ( 40 ) is coupled to the float ( 31 ) and switches between a standby condition an active condition respectively to the closed and open positions of the valve operating mechanism ( 60 ). The actuator means ( 40 ) comprises an over-center mechanism having an actuator ( 71 ) which is operatively associated with the valve operator ( 60 ), a float follower ( 41 ) movable in response to rising and falling of the float ( 31 ), and a spring mechanism ( 58 ) acting between force points on the float follower ( 41 ) and the actuator ( 71 ).</p> |
