Welcome to ETC Educational Technology Connection (HK) Ltd!
A pump cylinder is used to pump air into the compressed air reservoir. Pressure increases in the interior, similar to blowing up a balloon. The compressed air reservoir is so stable that it does not deform due to the air pressure. The check shuttle valve prevents compressed air from leaking from the compressed air reservoir towards the pump cylinder. If a connected valve is opened, air can flow into the connected cylinder due to the pressure.