What is used to ensure correct operation of a safety valve?

The correct answer pertains to the necessity of using a calibration tool to ensure that a safety valve operates correctly. This tool is essential for adjusting and testing the valve to ensure it opens at the specified pressure setting. Calibration is critical because it verifies that the safety valve will discharge excess pressure in the system, thereby preventing potential overpressure scenarios that could lead to equipment failure or safety hazards.

Utilizing a calibration tool guarantees that the safety valve functions within its designated parameters, ensuring safety and reliability in high-pressure boiler systems. It allows technicians to conduct precise measurements and adjustments, which are imperative for compliance with safety standards and regulations.

While visual inspection is important for identifying obvious signs of damage or wear, it does not provide the same level of assurance regarding the valve's performance under pressure. A backup pressure gauge can be beneficial for monitoring system pressure, but it does not directly impact the valve's operation integrity. Furthermore, a vent system is more related to the safe discharge of steam or pressure rather than ensuring the correct operation of a safety valve itself.