30/07/2026
🛡️ Oxy-fuel safety is not optional! Understanding your equipment is the first step to staying safe.
Many welders use Non-Return Valves (NRV) and Flashback Arrestors (FBA) interchangeably, but their jobs are completely different. Using only an NRV can leave you vulnerable to a serious, high-pressure explosion.
Here’s the step-by-step breakdown of what each one does to keep you safe:
What Happens in an NRV (Left side of video):
1️⃣ Gas Flow: Normal flow travels up from the Inlet Port.
2️⃣ Non-Return: If gas tries to flow backwards, the Pressure Seat and Internal Valve slam closed, stopping backflow.
3️⃣ Backfire: NRV only stops backflow of gases. It does not stop a flame front.
What Happens in an FBA (Right side of video):
1️⃣ Inlet: Flow enters the Gas Chamber.
2️⃣ Double Check: The Non-return mechanism stops backflow.
3️⃣ Flame Quench: If a flame front occurs, the Multi-layer Sintered Filter (copper mesh) quenches the flame by absorbing the heat and stopping its path.
4️⃣ Secondary Filter: The Gray mesh provides another layer of flame prevention.
Remember: One stops only gas; the other stops gas and flames. Never use oxy-fuel equipment without an approved FBA!
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