| 摘要 |
A flush tank having a downwardly open outlet and a valve for filling the tank with a liquid has a flush valve having a tube fitted to the outlet and having an upper end vertically displaceable in the tank. A float fixed to the tube upper tube end has a buoyancy changeable between a high buoyancy capable of holding the tube upper end above a liquid level in the tank and a low buoyancy insufficient to hold the tube upper end above the liquid level. An actuator connected to the float can temporarily change the float from high buoyancy to low buoyancy and thereby sink the tube upper end below the liquid level and cause the is liquid in the tank to flow through the tube out of the outlet. The float has a lower part annularly surrounding the tube and an upper part formed as an upper space having a large upwardly open mouth level with the upper end of the tube and a small opening below its mouth opening into the tube.
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