All our balls come with an adjustable valve that regulates the flow of air. When the valve is open, air can move in both directions, leading to potential deflation when the pump is removed. However, once the valve is closed, it becomes one-way, preventing the air from escaping. There are two types of valves on our balloons. If your valve has a white button, simply push it in to close the valve. If your valve is grey, it needs to be pushed in and then given a 1/4 turn to secure it. Once the valve is correctly adjusted, your balloon should remain inflated even after you remove the pump.