| 摘要 |
<p>A sluice gate for controlling the discharge of water through a gateway (5) in a flood irrigation system comprises mounting means (8, 9) with stub axles (10) defining a hinge axis upstream of the gateway (5), a closure element (11) mounted for swing movement about that axis and able to swing from a lower position wherein it blocks the gateway (5) to an upper position wherein it allows liquid to flow through the gateway (5), a buoyancy chamber (14) integral with the closure element (11), a filler opening (21) through which liquid from the upstream side of the gateway (5) may enter the buoyancy chamber (14), a drain opening (22) that is larger than the filler opening (21) through which liquid may drain from the buoyancy chamber (14) to the downstream side of the gateway (5), and a battery powered solenoid valve (23, 24), actuated by actuator means (25) responsive to a radio signal from a remote water sensor, controlling the flow of water from the buoyancy chamber (14) through the drain opening (22).</p> |
