Which component regulates the flow rate of air delivered to the patient?

• A. Proportional solenoid valves
• B. Digital valves w/ on/off configuration
• C. Flow Control Valves
• D. Breath Triggers

Answer: (C)

Regulating the flow rate comes from adjusting how much air can pass through the path to the patient. A flow control valve is designed to set and maintain a specific air flow by changing the opening size and adding the right amount of resistance. This lets the ventilator deliver a stable, target amount of gas regardless of small pressure changes in the system. Proportional solenoid valves can modulate flow based on a control signal, but the device whose primary job is to establish and hold a chosen flow rate is the flow control valve. Digital on/off valves would only open or close the path, not provide a steady regulated rate, and breath triggers are about sensing patient effort, not controlling how much air is delivered.