What is a feature of some electric valves regarding manual operation?

• A. They cannot operate without electricity.
• B. Some electric valves have a manual on/off override that can turn on without electricity but must be turned off manually.
• C. They always require manual shutoff.
• D. They automatically turn off after a minute.

Answer: (B)

Electric valves often include a manual override so you can operate the valve without power. This override lets you turn the valve on without electricity, which is handy for testing, flushing, or maintenance. However, after using the override, you must turn it off manually because there isn’t an automatic shutoff in that mode—the valve will stay open until you return it to the off position or restore power and let the control system manage it. The other options miss this practical feature: you don’t rely solely on power to operate, there isn’t an automatic one-minute shutoff, and manual shutoff isn’t required in normal operation.