Recreational Vehicle (RV) Technician Practice Test

An excess control valve serves a critical safety function in propane systems by closing when the flow exceeds a specified rate. This mechanism is essential for preventing potential hazards such as leaks or excessive pressure build-up within the system. When the flow rate surpasses the predetermined threshold, the valve activates to cut off the propane supply, thereby mitigating risks associated with overpressure or massive leaks which could lead to dangerous situations. While there are other devices in the propane system that manage flow and pressure, the excess control valve specifically addresses the critical need for safety by monitoring flow rates and responding appropriately. It plays a vital role in ensuring that the system operates within safe parameters, highlighting the importance of this component in propane system design and function.