What is the purpose of a manual shutoff valve in a pneumatic circuit?

The purpose of a manual shutoff valve in a pneumatic circuit is to isolate sections for maintenance or repair. This is crucial for ensuring safety when conducting maintenance work, as it allows technicians to physically cut off airflow to specific parts of the system. By isolating certain components, the manual shutoff valve prevents unintentional operation of the equipment while servicing it, thereby reducing the risk of accidents or injury. This functionality is especially important in complex pneumatic systems where multiple lines and components operate simultaneously.

In contrast, the other options do not accurately reflect the role of a shutoff valve. Continuous air flow is typically maintained through other methods, while increasing air pressure and regulating air temperature are managed through different types of equipment, such as compressors and temperature control devices.