21K77 - Victor 21K77 Mixer Assembly for CA2460

Technical Overview of the Victor 21K77 Throat Mixer

The Victor 21K77 Throat Mixer is a precision-engineered component designed for use within heavy-duty oxy-fuel cutting attachments, specifically the renowned CA2460 series. Manufactured by ESAB under the Victor brand, this mixer plays a pivotal role in the thermodynamics of the cutting process. It is responsible for the aspiration and turbulent mixing of low-pressure fuel gas with high-pressure preheat oxygen. This mixing occurs within a calibrated chamber to ensure a stoichiometric ratio that produces the maximum flame temperature and heat transfer efficiency.

Constructed from high-grade brass, the 21K77 is machined to tight tolerances to ensure a perfect seal against the torch body and the cutting attachment head. The internal geometry is designed to optimize gas velocity, which is critical for preventing the flame from receding into the torch (flashback). Over time, carbon deposits and heat cycling can degrade the internal surfaces of a mixer, altering the flow characteristics. Replacing the mixer with this genuine OEM part restores the factory-specified flow rates and mixing dynamics, ensuring the cutting attachment operates within its safe design parameters.

Technicians and safety officers should note that a compromised mixer is a common cause of flame instability and popping. The 21K77 is a direct replacement unit that integrates seamlessly with the existing torch handle and cutting head assembly, requiring no modification. It is compatible with various fuel gases as dictated by the cutting tip and injector configuration of the torch system.