01Z99 - ESAB W-17 Torch Injector for Fuel Gas, Size 250

ESAB W-17 #250 FG Injector Overview

The ESAB W-17 #250 FG Injector (SKU: 01Z99) represents a critical component in the assembly of heavy-duty oxy-fuel welding and heating equipment. Specifically engineered for the renowned W-17 torch handle—a legacy platform originally developed by Linde and now manufactured by ESAB—this injector facilitates the precise mixing of oxygen and fuel gases. The "FG" nomenclature is technically significant; it denotes that the injector's internal geometry and flow characteristics are optimized for "Fuel Gas" applications. In the context of industrial welding, this category typically excludes acetylene and instead encompasses alternative fuels such as propane, natural gas, propylene, and MAPP gas. These gases operate at different pressures and combustion velocities compared to acetylene, necessitating a specialized injector design to maintain flame stability and prevent backfires.

The #250 sizing of this injector indicates its capacity within the W-17 series lineup. It is a high-capacity unit intended for substantial heat output, making it suitable for heating large metal sections, bending, straightening, and heavy welding operations where deep thermal penetration is required. The injector operates on the aspiration principle, where the higher-pressure oxygen stream creates a venturi effect, drawing the lower-pressure fuel gas into the mixing chamber. This design is particularly advantageous in shop environments where fuel gas is supplied at low pressures, such as from a municipal natural gas line.

Maintenance professionals and fabricators rely on genuine ESAB parts like the 01Z99 to ensure the longevity and safety of their equipment. Using an injector that is mismatched to the fuel gas type or torch handle can result in inefficient combustion, carbon buildup, and hazardous operating conditions. This component is manufactured from high-quality brass alloys, offering resistance to heat and corrosion inherent in the welding environment. It installs directly into the W-17 handle, serving as the interface between the gas supply and the welding tip or heating nozzle. By ensuring the correct stoichiometric mixture of oxygen and fuel, the W-17 #250 FG Injector allows operators to achieve a neutral flame easily, which is fundamental for producing sound welds and controlled heating zones without oxidizing the workpiece.