Danfoss 068Z3404 Expansion Valve

Maintain precise superheat control in secondary refrigeration and low-temperature storage with the Danfoss 068Z3404. Engineered specifically as a TES 2 expansion valve, this component is optimized for R404A and R507 refrigerants, featuring a specialized Range B charge capable of managing evaporating temperatures from -75°F to -15°F. Unlike standard internal equalizing valves, this unit utilizes an externally equalized 1/4 inch flare port to compensate for pressure drops across the evaporator, ensuring maximum coil efficiency in complex high-PSI systems up to 500 psig.

The Danfoss 068Z3404 TXV is built with a rugged brass body and 3/8" x 1/2" flare connections, simplifying field replacement without the need for hot work. The 59-inch capillary tube provides ample reach for remote bulb mounting, while the stainless steel bulb construction allows for rapid thermal response and accurate sensing of suction line temperatures. Contractors often utilize this valve for its interchangeable orifice assembly, which permits exact tonnage matching and easier inventory management across varied service calls.

• Universal Refrigerant Compatibility: Specialized for high-pressure R404A and R507A applications in commercial cooling.
• Extreme Temperature Range: Optimized for deep-freeze environments with a dedicated Range B thermal charge (-60°C to -25°C).
• External Equalization: Essential for systems with high pressure-drop evaporators to maintain stable superheat levels.
• Field Serviceability: Features an adjustable superheat spindle and flare-to-flare connections for streamlined installation and tuning.
• Superior Durability: Laser-welded stainless steel power element ensures reliable performance in corrosive or high-vibration environments.

Common Questions:

Does this valve include a specific orifice?
This is the thermostatic element and valve body only; the orifice must be sized and purchased separately based on your specific BTU/load requirements.

Can I use this for air conditioning applications?
No, the Range B charge is specifically designed for low-temperature refrigeration. Using it for high-temperature AC applications will cause improper superheat regulation and potential compressor flooding.

What is the benefit of the flare-to-flare design?
The 3/8" x 1/2" flare connection eliminates the need for brazing, which reduces oxidation risk inside the lines and allows for faster swaps in occupied spaces where torches are restricted.

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.