What position should the boiler desuperheater inlet valves be in?

What position should the boiler desuperheater inlet valves be in?

• A. Locked and open
• B. Open and closed
• C. Fully closed
• D. Partially open

Answer: (A)

The desuperheater must have a reliable cooling-water supply while preventing accidental shutoff or uncontrolled changes. Keeping one inlet valve locked ensures it cannot move or close, while leaving the other inlet valve open guarantees that water can flow into the desuperheater when cooling is needed. This arrangement provides a guaranteed path for cooling water and protects against unintended valve movement. Fully closing both would cut off cooling, opening both without locking could allow unwanted flow changes, and a partially open valve would give unstable, inconsistent cooling.

The desuperheater must have a reliable cooling-water supply while preventing accidental shutoff or uncontrolled changes. Keeping one inlet valve locked ensures it cannot move or close, while leaving the other inlet valve open guarantees that water can flow into the desuperheater when cooling is needed. This arrangement provides a guaranteed path for cooling water and protects against unintended valve movement. Fully closing both would cut off cooling, opening both without locking could allow unwanted flow changes, and a partially open valve would give unstable, inconsistent cooling.