Trane VAL8634 TXV

Modern HVAC technicians and commercial contractors require reliable refrigerant metering to maintain system efficiency, and the Trane VAL8634 (identical to X15111278080) is a high-performance R-410A thermostatic expansion valve engineered for 5-ton refrigeration systems. This OEM thermostatic expansion valve is designed to precisely modulate liquid refrigerant flow into the evaporator, preventing compressor slugging while maintaining an optimal TXV superheat of approximately 14 to 18 degrees, depending on the specific HVAC system compatibility and outdoor unit requirements.

The VAL8634 TXV with mechanical fittings eliminates the need for torch work at the valve body, reducing the risk of internal component damage during installation. Featuring 5/8-inch inlet and outlet connections with a 1/4-inch SAE flare and nut external equalizer connection, this VAL8634 R410A 5-ton valve ensures a leak-resistant seal for 4TEC3F air handlers and 4TXA A-coils. Built for high-pressure R-410A systems, this valve uses a non-bleed port design to support maximum energy efficiency and stable pressure differentials across the evaporator coil.

• Direct OEM Replacement: Fully compatible with Trane and American Standard 5-ton evaporators, cross-referencing to part numbers VAL08634 and X15111278080.
• Mechanical Fitting Design: Threaded connections allow for straightforward installation and future maintenance without requiring onsite brazing.
• Optimized Efficiency: Precision internal check valve design maintains consistent refrigerant flow to maximize cooling capacity and hardware longevity.
• System Matching: Specifically calibrated for the higher operating pressures of R-410A refrigerant and POE oil configurations.

• Is the VAL8634 compatible with R-22 systems? No, this expansion valve is specifically calibrated for R-410A refrigerant and must match the refrigerant type listed on the nameplate of the condenser.
• Does this valve require an external equalizer line? Yes, this specific TXV features a 1/4" SAE flare connection for an external equalizer to monitor evaporator pressure accurately.
• What units does this expansion valve fit? It is a primary replacement for various 5-ton Trane and American Standard 4TEC3F and 4TXC coil models.

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.