Torch with integral flashback arrestors and check valves

Abstract

In a torch which uses oxygen and a fuel gas, a first flashback assembly and a second flashback assembly are formed as an integral part of the torch handle. Each flashback assembly includes three primary components as follows: a porous metal flashback arrestor, a retainer and a check valve subassembly. In the preferred embodiment, the porous metal flashback arrestor is mounted on one end of the retainer and the check valve subassembly is held in the other end. In an alternative embodiment, the check valve subassembly is positioned on the interior of the porous metal flashback arrestor. Each flashback assembly can be easily removed and replaced during periodic reconditioning of the torch. The flashback assemblies utilize a parts-in-place principle which precludes operation of the torch unless both flashback assemblies are installed in the torch handle. The porous metal flashback arrestor is designed to reduce the possibility of migration of a flashback upstream from the torch. The check valve subassemblies are designed to reduce the possibility of reverse flow of gas upstream from the torch. This invention does not prevent flashback from occurring; however, it does reduce the possibility of a flashback migrating from the torch into the hose or other components in a typical oxy-fuel cutting, heating, soldering, brazing or welding system.