Toilet inlet valve and control method thereof

A toilet inlet valve comprising a valve body, an inlet pipe, a water stop device, wherein, the water stop device also comprises:

• a water stop seat, which is located at a front end of an outlet pipe, and of which an opening is coupling with an end face of the water stop rubber gasket;
• a tray, which is connected to the water stop rubber gasket, and is located at a side of the water stop rubber gasket that is opposite to the water stop seat;
• a needle valve, which is fixed to the tray, and is located at a side of the tray that is opposite to the water stop rubber gasket;
• a back pressure cavity, which is a cavity with a discharge hole, containing the tray and the needle valve, and is provided with a needle valve hole sleeved around the needle valve;
• wherein water is divided into two ways by an inlet pipe valve body, one way is a dry way, and another way is a control branch;
• wherein in the dry way, water enters a fluid cavity of the inlet pipe, reaches the water stop rubber gasket, and then a reverse water pressure is generated, which is in an opposite direction to a water flow direction in the inlet pipe;
• wherein in the control branch, water passes through the gap between the needle valve and a needle valve hole, and then reaches the back pressure cavity containing a needle valve cover, and then a downstream water pressure to the tray is generated, in a same direction as the water flow direction in the inlet pipe;
• wherein when the discharge opening is blocked, water flows into the back pressure cavity through the inlet of the back pressure cavity, the control branch that is formed by the gap between the needle valve and the needle valve hole, the downstream water pressure to the water stop rubber gasket in the back pressure cavity is bigger than the reverse water pressure, and the water stop seat is blocked by the water stop rubber gasket;
• wherein when the discharge opening is opened, the stored water in the back pressure cavity flows out of the discharge opening, and the downstream water pressure is decreased;
• wherein when the intensity of water pressure to the water stop rubber gasket in the back pressure cavity is smaller than the reverse (outside) intensity of pressure, then the water stop rubber gasket is opened.