1. Emergency shutdown: In case of system failure (such as overpressure, overtemperature, leakage), quickly cut off the flow of media (gas, liquid) to prevent the accident from expanding (such as chemical pipelines, gas systems).
2. Process start stop: Under normal operating conditions, control the on/off of the medium to achieve the start or stop of equipment/processes (such as production line feeding, tank feeding and discharging).
3. Safety isolation: When repairing equipment, cut off the upstream and downstream media to form a safety isolation area, ensuring the safety of personnel and equipment.