Trane VAL8702 TXV

The Trane VAL8702 TXV is a precision-engineered 4-ton thermal expansion valve designed specifically for R-410A refrigerant systems. This externally equalized valve features 3/8" ODF inlet and 1/2" ODF outlet connections, ensuring a secure, leak-resistant braze fit during field installation. As a critical metering device, the VAL8702 maintains the precise superheat required to optimize evaporator coil efficiency and prevent liquid slugging, which protects the compressor from premature failure. Built for compatibility with high-efficiency Trane and American Standard air handlers and cased coils, this R-410A expansion valve responds rapidly to load changes, ensuring stable system performance across varying ambient temperatures. For technicians performing retrofits or repairs, utilizing this OEM-spec component ensures the system meets original factory subcooling and superheat design parameters, maintaining the integrity of the HVAC refrigerant circuit and overall cooling capacity.

• Optimized Superheat Control: Maintains precise refrigerant flow to maximize heat transfer across the evaporator.
• OEM Compatibility: Exact fit for 4-ton Trane and American Standard residential and light commercial split systems.
• Durable Construction: Engineered to withstand high-pressure R-410A environments and thermal cycling.
• System Reliability: Minimizes compressor stress by preventing refrigerant migration and liquid carryover.

What is the connection size for the VAL8702?
This valve features standard 3/8" x 1/2" solder connections and an external equalizer line for accurate pressure sensing at the evaporator outlet.

Can this TXV be used with R-22 systems?
No, the VAL8702 is calibrated specifically for the pressure-temperature characteristics of R-410A and should not be used in legacy refrigerant systems.

What are the signs of a failing 4-ton TXV?
Common indicators include hunting, high suction-side superheat, or evaporator coil icing due to restricted refrigerant flow.

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.