The 2000 psi isolation valve remains OPEN unless what occurs?

The 2000 psi isolation valve remains OPEN unless what occurs?

• A. An isolation occurs
• B. Power loss occurs
• C. Overpressure occurs
• D. Routine maintenance

Answer: (A)

The valve is designed to be normally open to keep the 2000 psi hydraulic circuit pressurized and available. It only closes when an isolation event occurs, meaning a commanded action or fault condition that requires isolating that circuit. In other words, the purpose of this valve is to stay open for normal operation and only shut off when isolation is required for safety or maintenance. Power loss, overpressure, or routine maintenance don’t automatically cause it to close unless an isolation command is issued as part of those procedures.

The valve is designed to be normally open to keep the 2000 psi hydraulic circuit pressurized and available. It only closes when an isolation event occurs, meaning a commanded action or fault condition that requires isolating that circuit. In other words, the purpose of this valve is to stay open for normal operation and only shut off when isolation is required for safety or maintenance. Power loss, overpressure, or routine maintenance don’t automatically cause it to close unless an isolation command is issued as part of those procedures.