0386-1031 - TurboTorch STOR-3 Replacement Orifice for ST-3 and ST-4 Tips

Technical Overview of the TurboTorch STOR-3 Orifice

The TurboTorch 0386-1031 STOR-3 Orifice is a critical replacement component engineered specifically for the ST-3 and ST-4 Extreme™ Self Lighting Tips. In air-acetylene torch systems, the orifice plays a pivotal role in the fluid dynamics of the combustion process. It acts as the primary restriction point that accelerates the fuel gas, creating the necessary pressure drop to entrain atmospheric air through the tip's intake ports. This venturi effect is essential for achieving the stoichiometric mixture required for a stable, high-temperature flame used in soldering and brazing applications.

Over time, carbon buildup, heat cycling, and mechanical wear can degrade the precision geometry of the orifice. A worn or clogged orifice often results in a distorted flame pattern, reduced heat output, or flame instability such as sputtering and popping. Replacing the orifice with a genuine TurboTorch STOR-3 unit restores the tip's internal gas velocity and mixing ratios to factory specifications. This component is manufactured from high-quality brass to withstand the thermal stresses inherent in oxy-fuel and air-fuel environments.

Installation of the STOR-3 is straightforward, involving the removal of the tip assembly to access the internal seating. It is designed to thread securely into the torch body, ensuring a leak-free seal. Technicians utilizing ST-3 and ST-4 tips for HVAC and plumbing installations rely on the precision of this orifice to maintain the efficiency of their brazing operations. Using the correct orifice size is mandatory; installing an incorrect size can lead to dangerous flashback conditions or insufficient flame temperature.

Specifications and Compatibility

This orifice is strictly compatible with TurboTorch ST-3 and ST-4 tips. It is not interchangeable with larger tips in the ST series (such as the ST-5 or ST-6) which require different flow rates. The 0386-1031 is designed for use with Acetylene gas and is not suitable for Propane or MAPP gas tips, which utilize different injector designs.