Is there a pneumatic switch, which will be turned off as soon as there is no pneumatic switch?

Yes Your switching function requires pneumatic components. There are two options:

1. check valve (pneumatic), also known as pneumatic check valve. It is an on-off valve, which can control the airflow to flow only in one direction, but not in the opposite direction. According to the thickness requirements of pneumatic pipeline, check valves with appropriate specifications are selected and installed on the pipeline. When there is pressure (gas), the valve will be automatically opened by the pressure to realize continuous circulation; When there is no pressure (no gas), the valve will automatically reset and close the gas valve. Are self-controlled

2. Pneumatic pressure switch (pneumatic). It is also used in pipes. But the pressure control can be set and adjusted. That is, there is an adjusting device on the switch, which can set the air pressure to several kilograms before opening the cycle, and then close it below several kilograms, which is controlled by the adjusted pressure. Gas circulation is not one-way, but has a direction of installation.