Which device is used to stop oil flow if an oil line leaks?

• A. Check valve
• B. Ball valve
• C. Pressure regulator
• D. Oil safety valve

Answer: (D)

In oil-fired systems, safety relies on automatically stopping fuel flow if something goes wrong with the line. The oil safety valve is designed to shut off the oil supply automatically when the burner control detects a fault or a leak condition. It stays open during normal operation, but if a problem is detected—such as flame failure or a leak—the control commands the valve to close, preventing further oil from flowing and reducing fire risk. The other devices don’t provide that automatic shutoff: a check valve only prevents backflow, a ball valve is a manual shutoff, and a pressure regulator simply controls pressure, not stop flow in a leak.