Oxygen has no flashback preventer, because oxygen supports combustion and will not burn by itself. Oxygen has a safety valve. It is a device to protect the pressure reducing valve and make it safe to use, and it is also a signal device for the failure of the pressure reducing valve. If the outlet pressure rises by itself and exceeds a certain allowable value due to the damage of the trap gasket and valve or other reasons, the safety valve will automatically open the exhaust.

Acetylene has a flashback preventer, which is installed behind the acetylene pressure gauge and connected to the pipeline to prevent flashback during gas welding and gas cutting and prevent flame from entering the gas cylinder and exploding.