Quick exhaust valve's principle is based on buoyancy. When the water level rises, the stainless steel floating ball in the exhaust valve will rise due to the buoyancy of water until it contacts the sealing surface of the exhaust port. When a certain pressure is reached, the ball will automatically close. When the water level in the valve drops, due to the influence of gravity and decompression, under appropriate conditions, the floating ball will also drop, and a large amount of air will be injected into the pipeline through the exhaust port to quickly eliminate the air backflow or negative pressure state.