Danfoss 068Z3421 TXV

The Danfoss 068Z3421 TXV is a high-precision thermostatic expansion valve (TE 2 series) engineered for contractors and technicians working with R404A and R507 refrigerants. This externally equalized valve features a 3/8" flare inlet and a 1/2" solder ODF outlet, making it a versatile choice for commercial refrigeration, cold storage, and supermarket display cases. Designed for reliable performance in low-temperature applications, it operates within an evaporating temperature range of -75°F to +50°F (-60°C to +10°C). The Danfoss TE 2 body is built with a durable brass housing and includes a 59-inch capillary tube with a stainless steel sensing bulb for superior temperature transfer and sensitive superheat control. With a maximum working pressure of 500 psig (34 bar), the 068Z3421 expansion valve ensures stable evaporator feeding even under varying load conditions. For peak efficiency, ensure the interchangeable orifice is correctly sized for your specific system capacity and that the external equalization line is securely connected to the suction header.

• Precise Superheat Control: Adjustable static superheat setting allows for fine-tuning to prevent compressor slugging and optimize coil efficiency.
• Durable Construction: Laser-welded stainless steel power head and hermetic design provide long-term reliability in harsh mechanical environments.
• Interchangeable Orifice System: Simplifies inventory and allows for easy capacity matching across multiple R404A/507 refrigeration systems.
• External Equalization: Essential for systems with high pressure drops across the evaporator, ensuring accurate bulb response.
• Wide Temp Range: Suitable for both medium and low-temp applications, including walk-in freezers and refrigerated transport.

What is the connection type for the Danfoss 068Z3421?

This specific model utilizes a 3/8" flare inlet and a 1/2" solder (ODF) outlet. It requires a 1/4" solder connection for the external equalization line.

Does this valve include the internal orifice?

No, the Danfoss TE 2 series uses an interchangeable orifice system. The orifice assembly must be selected based on the required cooling capacity (tons or kW) and purchased separately.

Can this TXV be used with R134a or R22?

The 068Z3421 is specifically charged and calibrated for R404A and R507. Using it with other refrigerants will result in incorrect superheat levels and potential system failure.

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.