28Z91 - ESAB Purox AC-4 Mixer Replacement Spring

Genuine ESAB Replacement Spring for AC-4 Mixers

The ESAB 28Z91 Spring is a specialized replacement component designed exclusively for the AC-4 Mixer assembly found in Purox-style oxy-fuel welding equipment. As a critical internal part, this spring is engineered to provide the precise tension required to maintain the correct seating and operation of the mixer's internal valving and flow control mechanisms. Manufactured to ESAB's exacting standards, this spring ensures that your equipment continues to meet the rigorous demands of industrial welding and brazing applications.

Over time, internal springs in welding torches and mixers can lose their tension due to thermal cycling, fatigue, or general wear. A compromised spring can lead to inconsistent gas mixing, fluctuating flame characteristics, or even internal leaks that pose safety risks. By replacing worn components with the genuine 28Z91 spring, operators can restore the original functionality of their AC-4 mixer, ensuring a stable, neutral flame and reliable performance. This part is essential for maintenance professionals and welders who rely on the W-200 series handles and compatible mixers for precision work.

Installation of the 28Z91 requires disassembly of the mixer unit. It is recommended that this procedure be performed by qualified personnel familiar with oxy-fuel equipment repair to ensure all seals and components are correctly reassembled. Using genuine OEM parts like this spring guarantees dimensional accuracy and material compatibility, preventing the issues often associated with generic aftermarket replacements. Whether performing routine maintenance or a complete overhaul of your gas apparatus, the ESAB 28Z91 is the correct specification for the AC-4 mixer.

Investing in proper maintenance parts extends the lifecycle of your welding apparatus. The AC-4 mixer is a workhorse in the industry, and keeping its internal components fresh is key to longevity. This spring is made from high-quality steel treated to resist corrosion and maintain elasticity under the variable temperature conditions found in welding environments.