Leak-proof device for water inlet valve

A leak-proof device for a water inlet valve, comprising a valve body, an outer water tank, an inner water tank, a leak-proof water tank, an outer float, an inner float, a leak-proof float, and a lever;

• a water inlet channel and a water outlet channel being formed in the valve body, a control valve being installed in the valve body, the control valve controlling opening and closing of the water inlet channel and the water outlet channel;
• the outer water tank being installed on the valve body, a water inlet hole being disposed at a bottom of the outer water tank, the inner water tank being disposed in the outer water tank, the inner water tank having a height lower than that of the outer water tank, water overflowing from the outer water tank to the inner water tank;
• the lever being pivotally connected to the valve body, one end of the lever being connected to the outer float, the outer float being disposed in the outer water tank, another end of the lever being connected to the inner float, the inner float being disposed in the inner water tank, a plug being mounted to a lower end of the inner float;
• the leak-proof water tank being mounted on the valve body, the leak-proof water tank being in communication with the inner water tank via a water-passing channel, the lever being swung for the plug to close the water-passing channel or to open the water-passing channel;
• the leak-proof float being disposed in the leak-proof water tank, the leak-proof float being connected to the control valve, wherein when the leak-proof float rises, the control valve is driven to close the water inlet channel of the valve body.