1. There is a baffle on the lid that can slide in parallel. 2. There is a through hole on the stop plate, which cooperates with the stop valve to realize the stop function. 3. In normal operation, the check valve should be able to pass through the hole of the check valve plate smoothly, so as not to leak when pressurized. 4. If the lid is not in place, the valve will not correspond to the opening of the stop plate, and the valve will not be able to rise and seal smoothly when pressed up, so it will leak and spray porridge. 5. If you cook porridge frequently and don't wash the lid often, porridge will stick to the sealing ring under this valve. In the long run, it is difficult to achieve sealing here, and air will leak. Therefore, it is necessary to wash the pot cover frequently, and the pot cover should be in place reliably. When the valve leaks, check whether it is aligned with the stop plate hole, which is basically the case.