Abstract: A fill valve is disclosed for use in a toilet tank, to work in conjunction with a flapper, includes a float cup forming a recess and at least one opening in or near the bottom and at least one opening at or near the top thereof, a valve body installed through the recess, on which the float cup freely moves up and down, and a coil spring placed between the top of the valve body and the top inside of the float cup. The coil spring exerts upward pressure from the top of the valve body against the top of the float cup. The float cup fills at least partially with water taken in through the at least one opening. When the flapper is lifted and water flows out of the tank, the float cup moves down the valve body until the spring is substantially compressed. When the water has substantially drained from the tank, then the water that at least partially filled the float cup runs out of the float cup through the at least one opening in the bottom, and the spring returns the float cup to the upper position.