The pressure cooker is designed with a sealed structure, which means that when it is in a hot state, steam continues to be generated due to the retained heat inside. This steam can cause the float valve on the lid to rise, making it impossible to close the lid properly. This phenomenon is a normal result of pressure dynamics.
To address this, when you need to close the lid while the pressure cooker is still hot, make sure to remove the vent valve to allow the steam to escape. Once the steam is released and the lid is securely closed, remember to reinstall the vent valve to prevent it from getting lost. This ensures safe operation while maintaining the integrity of your cooking process.