Description
The Trane VAL7346 is a factory-engineered Thermostatic Expansion Valve (TXV) designed for 2-ton residential and light-commercial air conditioning systems operating on R410A refrigerant. With 3/8″ liquid-line and 1/2″ suction-line ODS (Outside Diameter Sweat) connections, this valve integrates seamlessly into Trane split systems and matched equipment, delivering precise refrigerant metering to maintain optimal evaporator superheat under varying load conditions.
How a TXV Works
A thermostatic expansion valve regulates refrigerant flow into the evaporator coil by sensing suction-line temperature and pressure. As the load on the system changes, the TXV modulates flow to keep superheat within a tight range — protecting the compressor from liquid slugging while maximizing evaporator efficiency. The Trane VAL7346 is factory-set and calibrated specifically for R410A operating pressures and 2-ton capacity, eliminating field adjustment and ensuring reliable, repeatable performance.
Key Features
- Designed for R410A refrigerant — compatible with modern high-efficiency systems
- Rated for 2-ton (24,000 BTU/hr) system capacity
- 3/8″ ODS liquid-line inlet connection
- 1/2″ ODS suction-line outlet connection
- Factory-calibrated superheat setting for plug-and-play installation
- Genuine Trane OEM replacement part (SKU: VAL7346)
- Engineered for direct compatibility with Trane matched systems
Application & Compatibility
The VAL7346 is intended as a direct OEM replacement for Trane split-system air conditioners and heat pumps utilizing R410A refrigerant at 2-ton capacity. Always verify the original equipment model number and refrigerant type before installation. Proper TXV selection is critical to system efficiency, compressor longevity, and warranty compliance.
Installation Notes
- Use ODS sweat connections — clean, deburr, and flux tubing before brazing
- Purge with dry nitrogen during brazing to prevent internal oxidation
- Ensure the sensing bulb is properly clamped to the suction line per Trane installation guidelines
- Verify system charge and superheat after installation
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