What is the difference between a check valve and a flashback arrestor? Do I need both?
Flashback arrestors are typically constructed with a sintered filter to absorb the flame in the event of a flashback and typically have a reverse flow check valve integrated into them. The check valve is designed to prevent gases from flowing in the wrong direction which could help produce flashback. In the event that a flashback still occurs, the sintered filter on the flashback arrestor is designed to pull the heat energy away from the flame and extinguish it. Because check valves are generally present in flashback arrestors, it is not necessary to install additional devices. In fact, doing so can cause gas flow restrictions that may lead to torch and/or tip overheating, backfires, or even a flashback.
