Trane FLG0258 Flange

The Trane FLG0258 is a high-performance ODF TXV flange set specifically engineered for seamless integration with thermal expansion valves in residential and commercial cooling systems. Featuring a 5/8 inch inlet and a 7/8 inch exit connection, these refrigerant line flanges provide a robust, leak-resistant interface between the metering device and the evaporator assembly. Designed to withstand operating pressures up to 750 PSI and a temperature range of 40-100 °F, the FLG0258 ensures the structural integrity of the high-side liquid line and low-side vapor connections. These OEM Trane parts are essential for technicians performing TXV replacements or fresh system commissions where precise fitment is required to prevent bypass leaks or pressure drops. The ODF (Oversize Diameter Female) sweat connections allow for standard brazing procedures, maintaining the precise refrigerant flow control necessary for optimal superheat regulation and compressor protection.

• Broad Compatibility: Engineered as a direct fit for various Trane and American Standard air handlers and cased coils.
• High Pressure Rating: Rated for up to 750 PSI, making it fully compatible with R-410A and high-pressure refrigerant cycles.
• Precision Machining: Ensures a flush seat against the TXV body to eliminate potential leak paths at the mechanical union.
• Technical Reliability: Maintains rigid structural support for the expansion valve, reducing vibration-induced fatigue on capillary tubes.

Is the FLG0258 compatible with R-410A systems?
Yes, the flange is designed to handle the elevated pressures of R-410A systems, rated for a maximum of 750 PSI.

Does this flange set include the required O-rings?
This part number typically refers to the metal flange components; however, it is standard practice to utilize new Teflon O-rings during any TXV service to ensure a gas-tight seal.

What is the proper tightening procedure for these flanges?
After ensuring the O-rings are seated, hand-tighten the bolts until the bodies bottom out, then use a backup wrench to tighten an additional 1/6 turn to provide the necessary crush seal without over-torquing.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.