What type of valve is required to be installed upstream of each burner in a flame effect?

The installation of an automatic fuel shut-off valve upstream of each burner in a flame effect is critical for ensuring safety in the event of a malfunction or an emergency situation. This type of valve is designed to automatically interrupt the flow of fuel to the burner if certain parameters are not met, such as flame presence or operational integrity. This automatic response minimizes the risk of fuel leakage or uncontrolled flame, thereby enhancing audience safety and compliance with safety standards outlined in the NFPA 160.

In contrast, while manual fuel shut-off valves require human intervention to operate and can effectively stop fuel flow, they do not provide the immediate response necessary in dynamic performance situations where quick action is crucial. Emergency fuel stop valves are essential for rapid manual control, but the reliance on human intervention could delay shutting off fuel flow during a critical incident. Pressure relief valves serve a different function related to preventing overpressure in fuel systems, rather than controlling the fuel flow to a burner, making them unsuitable for this specific application.