Danfoss 068Z3206 (TX2) Thermostatic Expansion Valve

Danfoss 068Z3206 is an internally equalized thermostatic expansion valve of the TX2 type in the T2/TE2 series, designed specifically for R22/R407C refrigerants with 3/8″ × 1/2″ flare connections. It is used for refrigerant flow control in dry evaporators of commercial and industrial refrigeration and air conditioning systems.

1. Model Code Breakdown

Core Attributes: No MOP (Maximum Operating Pressure) Kontrolle, no pre-installed nozzle (matching nozzle must be selected according to system requirements)

2. Technische Kernparameter

3. Applicable Operating Environment
4. System Types: Dry evaporators in commercial refrigeration equipment, industrial water chillers, and air conditioning systems
5. Operating Conditions:

Evaporation temperature: -40°C to +10°C

Working pressure: Complies with standard pressure ratings for R22/R407C systems

Compatible compressors: Reciprocating and scroll compressors

3. Installationsanforderungen:

Must be installed on the liquid line between the condenser and evaporator

Powerhead must be firmly mounted on the suction line at the evaporator outlet for good thermal contact

Capillary tube shall avoid excessive bending and contact with high-temperature surfaces

4. Markenübergreifende Referenz / Ersatzmodelle

5. Offizielle Bestellinformationen

6. Engineering Implementation Points
7. Nozzle Selection: Select the appropriate nozzle based on system cooling capacity, evaporation temperature and refrigerant type. If an exact capacity match is unavailable, select the next larger size nozzle.
8. Installationshinweise:

Liquid line must be sufficiently subcooled to avoid flash gas affecting valve performance

Powerhead mounting location shall avoid suction line bends and welds

Ensure system cleanliness; a 100μm strainer is recommended to prevent nozzle clogging by contaminants

3. Commissioning Points:

Typical superheat setting: 5-8 K, adjustable via the top adjustment screw on the valve body

Perform fine adjustment only after the system runs stably, with no more than 1/4 turn per adjustment

7. Partial Complete Model List for T2/TE2 Series

8. Key Risk Warnings
9. Refrigerant Restriction: This model is only suitable for R22/R407C and must not be used with other refrigerants such as R410A, R134a, otherwise valve damage or system failure will occur.
10. Equalization Matching: Internally equalized valves are only suitable for systems with low evaporator pressure drop (<0.3 Bar). For higher pressure drops, the externally equalized TEX2 (068Z3209) must be used.
11. Nozzle Compatibility: Only genuine Danfoss matching nozzles shall be used; non-genuine nozzles may reduce flow control accuracy and service life.

Complete List of Danfoss Thermostatic Expansion Valves

Danfoss thermostatic expansion valves cover multiple series to suit different refrigeration system requirements. Below is a categorized list by core series, including model, refrigerant, connection type, equalization type and key features for easy selection and replacement reference.

1. T2/TE2 Series (Replaceable Nozzle, Mainstream Universal Type)

The T2/TE2 series is a classic Danfoss thermostatic expansion valve with a replaceable nozzle design, suitable for dry evaporators in freezing, refrigeration, air conditioning and other applications.

1.1 Internally Equalized (T2)

1.2 Externally Equalized (TE2)

1.3 Solder Type Internal / External Equalized

2. TE5-55 Series (Industrial Grade, Large Cooling Capacity)

The TE5-55 series is designed for large commercial and industrial refrigeration systems with a wider cooling capacity range, also featuring a replaceable nozzle design.

3. TGE Series (AC Type, High-Pressure Applications)

The TGE series is specially designed for high-pressure refrigerants (z.B. R410A) with a working pressure up to 46 Bar, suitable for air conditioning and heat pump systems.

4. TU Series (Universal Type, Multiple Configurations)

The TU series offers various configuration options to suit different system requirements.

5. Special Series & Zubehör

5.1 Nozzle Accessories (Universal for T2/TE2 Series)

5.2 Powerhead & Capillary Tube

6. Key Selection Parameter Comparison Table

7. Risk Warnings & Notizen
8. Refrigerant Matching: Each model is only compatible with specified refrigerants; improper use causes valve damage and system failure.
9. Equalization Selection: Externally equalized valves must be used when evaporator pressure drop >0.3 Bar, otherwise flow control accuracy degrades.
10. Nozzle Compatibility: Only genuine Danfoss matching nozzles shall be used; non-genuine nozzles may cause unstable performance.
11. Installation Requirement: Powerhead must be firmly mounted on the suction line at the evaporator outlet for good thermal contact.
12. Commissioning Points: Typical superheat setting is 5-8 K; adjust no more than 1/4 turn each time, and fine-tune only after system stabilization.