Which method is required for sealing normally open valves?

Which method is required for sealing normally open valves?

• A. Locked
• B. Electrically supervised
• C. Padlocked
• D. Remote controlled

Answer: (B)

Sealing normally open valves requires a method that not only blocks unauthorized operation but also continuously verifies the valve’s position. Electrically supervised sealing provides this by combining a physical seal with an ongoing electrical check of the valve’s status. If the valve moves or the seal is tampered with, the supervision system detects it and raises an alarm or blocks action, ensuring any change is noticed immediately. In contrast, a padlock or simple lock may physically secure the valve but won’t continuously confirm that the valve remains in the intended open state or detect tampering. Remote control addresses operation, not the integrity of the seal. So, electrically supervised sealing is the only approach that reliably preserves the intended state and signals any deviation.

Sealing normally open valves requires a method that not only blocks unauthorized operation but also continuously verifies the valve’s position. Electrically supervised sealing provides this by combining a physical seal with an ongoing electrical check of the valve’s status. If the valve moves or the seal is tampered with, the supervision system detects it and raises an alarm or blocks action, ensuring any change is noticed immediately. In contrast, a padlock or simple lock may physically secure the valve but won’t continuously confirm that the valve remains in the intended open state or detect tampering. Remote control addresses operation, not the integrity of the seal. So, electrically supervised sealing is the only approach that reliably preserves the intended state and signals any deviation.