What is the function of a feedwater control valve in a boiler system?

• A. To regulate feedwater flow to maintain the desired boiler water level and respond to demand.
• B. To regulate fuel flow to the burner.
• C. To vent steam from the system.
• D. To measure water level in the boiler.

Answer: (A)

The feedwater control valve modulates how much water is fed into the boiler so the water level stays at the desired setpoint while meeting steam demand. When steam usage increases or the level tends to fall, the valve opens to add more water; when demand drops or the level is high, it closes to reduce water input. This keeps the boiler operating safely, preventing low-water conditions, carryover, or unnecessary water hammer, and it works in concert with the level and plant controls. The other options describe functions of other components (fuel control for the burner, venting steam, or measuring water level), not the job of the feedwater valve.