Danfoss 068Z3400 Expansion Valve

The Danfoss 068Z3400 is an industrial-grade T2 series thermostatic expansion valve designed for precise liquid injection into evaporators across commercial refrigeration and air conditioning systems. Field-proven for reliability, this internally equalized expansion valve is optimized for use with R404A and R507A refrigerants, supporting a broad operating temperature range of -40°F to +50°F. The valve features a durable brass body with 3/8" flare inlet and 1/2" flare outlet connections, ensuring a secure and leak-resistant fit in high-pressure environments up to 500 psig. Equipped with a 59-inch capillary tube and a high-grade stainless steel power head, this 068Z3400 TXV offers consistent superheat regulation. Technicians can achieve fine-tuned performance via the adjustable static superheat setting (factory set at 7.2°F), with 1/4 turn increments equivalent to approximately 1.75°F. By pairing this valve body with the appropriate Danfoss T2 orifice assembly, contractors can customize system capacity from 1/6 to 4.5 tons.

Key Benefits:

• Optimized Refrigerant Control: Designed specifically for R404A and R507A systems to prevent liquid slugging and protect the compressor.
• Internal Pressure Equalization: Simplifies installation in systems where pressure drop across the evaporator is negligible, eliminating the need for an external equalizer line.
• Modular Orifice System: High flexibility for various load requirements; compatible with interchangeable T2/TE2 orifices to match specific tonnage needs.
• Rugged Construction: Features a laser-welded stainless steel power head for extended service life and a brass body for superior corrosion resistance.
• Precise Adjustment: Easy-to-access adjustable superheat screw allows for field calibration to meet site-specific cooling demands.

Common Questions:

Which orifice should I use with the 068Z3400?
Capacity is determined by the specific orifice assembly (sold separately). You must select an orifice size (0X through 06) based on your system’s required tonnage and evaporator temperature.

Can this valve be used with an external equalizer?
No, the 068Z3400 is an internally equalized model. If your system has a high pressure drop across the evaporator or includes a distributor, a TE2 series valve with external equalization is required.

What is the proper sensing bulb placement?
For horizontal suction lines, the bulb should be secured between the 1 o'clock and 4 o'clock positions. Use the included bulb strap to ensure tight thermal contact and insulate the bulb after installation.

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.