Trane VAL7991 TXV

The Trane VAL7991 TXV is a high-precision thermostatic expansion valve engineered for 1.5-ton HVAC systems. Designed for professional refrigerant flow control, this valve features 5/16-inch ODF x 5/8-inch ODF connections and includes a 36-inch capillary tube to ensure accurate superheat monitoring at the evaporator outlet. As a critical component in maintaining system efficiency, the Trane VAL07991 (the updated OEM part number) modulates refrigerant flow based on heat load, preventing liquid slugging and protecting the compressor. HVAC technicians rely on this OEM expansion valve kit for precise temperature regulation in both residential and light commercial applications. Its robust construction is rated for high-pressure environments, often up to 700 PSI, meeting the demanding specs required for Trane and American Standard units. Replacing a faulty TXV with this genuine Trane part ensures the cooling cycle operates within exact thermal parameters, optimizing the heat exchange process for long-term reliability.

Key Benefits

• Precise Superheat Control: The 36-inch capillary tube ensures responsive refrigerant modulation for 1.5-ton evaporators.
• OEM Compatibility: Specifically calibrated for Trane and American Standard equipment to maintain original performance specs.
• Durable Brazed Connections: 5/16" x 5/8" ODF fittings provide a secure, leak-resistant interface for field installation.
• System Protection: Actively prevents liquid refrigerant from entering the compressor, extending the life of the cooling circuit.

Common Questions

Is the VAL7991 compatible with R-410A systems?
Yes, this thermal expansion valve is designed to handle the high-pressure requirements of modern R-410A refrigerant systems.

Can I use this TXV on a 2-ton system?
No, this valve is fixed-orifice calibrated specifically for 1.5-ton capacity systems to ensure correct superheat levels.

Does the kit include the sensing bulb?
The assembly includes the integrated sensing bulb and 36-inch capillary line required for standard evaporator mounting.

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.