Lennox 51W27 TXV Valve

The Lennox 51W27 TXV Valve is a critical OEM replacement part designed for precise refrigerant flow control in residential and light commercial air conditioning systems. As a veteran technician knows, maintaining the correct superheat is vital for protecting the compressor and ensuring evaporator efficiency. This thermal expansion valve is specifically engineered to handle R-410A refrigerant, utilizing a balanced port design to compensate for varying head pressures and load conditions. The Lennox 51W27 features a stainless steel sensing bulb and high-grade diaphragm assembly for consistent performance under high-vibration and thermal cycling environments. Whether you are performing a TXV conversion or replacing a high-side restricted valve, this component provides the exact orifice calibration required for Lennox air handlers and heat pumps. Sold as a TXV kit, it ensures your HVAC system returns to factory-spec efficiency, preventing liquid slugging and optimizing cooling capacity across the entire coil surface.

• OEM Precision: Guaranteed Lennox 51W27 compatibility for seamless integration with existing liquid line fittings.
• Superior Metering: Optimized for R-410A systems to maintain stable evaporator superheat across fluctuating ambient temperatures.
• Durable Construction: Heavy-duty brass body and stainless steel components resist internal corrosion and mechanical fatigue.
• System Protection: Acts as a reliable safeguard for the compressor by preventing refrigerant floodback during low-load periods.
• Installation Efficiency: Engineered for standard braze or threaded connections, reducing time on the job site.

What are the symptoms of a failing Lennox 51W27 TXV?
Common signs include a starving evaporator (high superheat, low suction pressure), flooding (low superheat, high suction pressure), or significant frost buildup on the expansion valve body or distributor tubes.

Is this valve adjustable for field tuning?
The 51W27 is typically factory-set to maintain optimal superheat. While some versions may allow manual adjustment, it is recommended to verify system charge and airflow before altering factory settings.

Does this kit include the teflon O-rings or sensing bulb clips?
Yes, this Lennox replacement part is supplied with the necessary hardware to ensure the sensing bulb is securely strapped to the suction line for accurate temperature feedback.

This item is not eligible for free shipping.

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.