Which of the following conditions triggers the need for valve supervisory systems testing?

The need for valve supervisory systems testing is indeed triggered when there is movement from the normal position. This movement indicates that the valve may not be properly functioning or has been tampered with, which can compromise the integrity and proper operation of the water-based fire protection system. Valve supervisory systems are designed to monitor the position of critical valves, ensuring they remain in the correct open or closed position as required for the system to operate effectively in an emergency situation.

When a valve moves from its normal position, it can cause significant issues, such as loss of pressure in the system, improper water flow, or even system failure during a fire event. Regular testing of supervisory systems allows for the early detection of such issues, ensuring that valves are operating as intended and that the fire protection system is reliable and effective when needed.

In contrast, conditions like temperature changes, pressure variations, and flow rate changes can be part of normal operational variances in the system and do not necessarily indicate an issue with valve position. Therefore, while they are important factors to monitor, they do not specifically trigger the need for testing a valve supervisory system in the same way that a position change does.