Daikin-McQuay 331761514 TXV Valve

The Daikin-McQuay 331761514 Thermostatic Expansion Valve (TXV) is a critical metering device engineered for precise refrigerant flow control in high-capacity HVACR systems. Featuring 1 1/8" x 1 3/8" ODF solder connections, this valve is designed to maintain optimal superheat across the evaporator coil, preventing liquid slugging and ensuring compressor longevity. As a genuine OEM replacement part, it integrates seamlessly with existing Daikin and McQuay air handling units and chillers. The mechanical assembly utilizes a balanced port design to compensate for varying head pressures and load fluctuations, providing stable performance even during off-design conditions. For technicians performing HVAC expansion valve replacement, this component ensures the thermal expansion cycle remains efficient, reducing energy consumption and system wear. Proper brazing techniques and the use of a wet rag on the valve body are essential during installation to protect the internal diaphragm and sensing bulb integrity.

Key Technical Benefits

• Precise Superheat Control: Maintains consistent evaporator efficiency across a wide range of operating temperatures.
• OEM Compatibility: Exact fit for Daikin-McQuay 331761514, eliminating the need for field modifications.
• Heavy-Duty Construction: Built to withstand high-pressure environments common in industrial cooling applications.
• Balanced Port Design: Minimizes the impact of pressure drops and supports stable refrigerant metering.
• Standard ODF Connections: Features 1 1/8 inch inlet and 1 3/8 inch outlet for standard copper piping integration.

Common Installation Questions

What are the symptoms of a failing TXV in a Daikin system?
Technicians typically observe high discharge pressures, low suction pressures, and excessive frost on the evaporator coil or hunt-and-surge cycles when the refrigerant metering device fails.

Does this valve include the sensing bulb and capillary tube?
Yes, this thermal expansion valve assembly includes the integrated power element and sensing bulb required for accurate temperature feedback to the diaphragm.

Is this TXV compatible with R-410A or R-22 systems?
You must verify the specific refrigerant charge and tonnage requirements of the power element head; this 331761514 model is calibrated for specific Daikin-McQuay commercial configurations.

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.