Which statement is true regarding the 2,000 psi isolation when it is deenergized OPEN?

Which statement is true regarding the 2,000 psi isolation when it is deenergized OPEN?

• A. They will stop immediately
• B. They will continue to operate normally
• C. They will operate with reduced capacity
• D. They will be unaffected

Answer: (B)

When the isolation valve is deenergized and OPEN, it is in its normally open position, so the hydraulic path remains unblocked and flow can pass through as usual. The 2,000 psi rating describes the pressure the isolation path is built to handle if it were used to isolate, not how the valve behaves when it’s open. So with the valve open, the circuit isn’t isolated and the system continues to receive pressure and operate normally. If the valve were closed (energized), it would interrupt flow and could change operation, but that’s not the case here.

When the isolation valve is deenergized and OPEN, it is in its normally open position, so the hydraulic path remains unblocked and flow can pass through as usual. The 2,000 psi rating describes the pressure the isolation path is built to handle if it were used to isolate, not how the valve behaves when it’s open. So with the valve open, the circuit isn’t isolated and the system continues to receive pressure and operate normally. If the valve were closed (energized), it would interrupt flow and could change operation, but that’s not the case here.