100A angle type water level valve is a diaphragm type valve that adjusts the liquid level height of water tank and water tower. The valve is divided into two chambers by a special reinforced nylon diaphragm, when the liquid level reaches the set position, the float pilot valve is closed, the pressure of the upper cavity is greater than the lower cavity, the valve is closed, that is, the water supply is stopped. When the liquid level drops beyond the preset position, the float pilot valve opens, the upper cavity pressure is less than the lower cavity pressure, and the valve opens. The valve supplies water to the pool.