The 2000 psi isolation valve is fail safe open, requires power to close it, and remains open unless an isolation occurs. Which psi rating applies to this valve?

The 2000 psi isolation valve is fail safe open, requires power to close it, and remains open unless an isolation occurs. Which psi rating applies to this valve?

• A. 1000 psi
• B. 1500 psi
• C. 2000 psi
• D. 2500 psi

Answer: (C)

Understanding how valve ratings relate to the system pressure they are designed to handle is essential here. A 2000 psi isolation valve is specified to safely operate and isolate a hydraulic circuit at up to 2000 psi. The fact that this valve is fail-safe open and requires power to close describes its behavior when power is removed and how you actively close it to isolate a portion of the system; it does not change the pressure rating. In other words, the rating indicates the maximum system pressure the valve is designed to contain during isolation, not the actuation force or fail-safe state. Therefore, the valve is rated for 2000 psi. The other pressures would only be correct if the valve were explicitly labeled for those different service pressures, which isn’t the case here.

Understanding how valve ratings relate to the system pressure they are designed to handle is essential here. A 2000 psi isolation valve is specified to safely operate and isolate a hydraulic circuit at up to 2000 psi. The fact that this valve is fail-safe open and requires power to close describes its behavior when power is removed and how you actively close it to isolate a portion of the system; it does not change the pressure rating. In other words, the rating indicates the maximum system pressure the valve is designed to contain during isolation, not the actuation force or fail-safe state. Therefore, the valve is rated for 2000 psi. The other pressures would only be correct if the valve were explicitly labeled for those different service pressures, which isn’t the case here.