Electric expansion valve Danfoss AKVH 10-0 068F4058 / 068F4088
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in stock
Specification
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VAT:23,00%
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Symbol:068F4058
Product Description
Danfoss AKVH 10-0 Electronic Expansion Valve – R744 / CO2 (068F4058 / 068F4088)
Danfoss AKVH 10-0 is a PWM-controlled electronic expansion valve designed exclusively for R744 (carbon dioxide / CO2) refrigerant. It operates as a normally closed expansion valve with solenoid function, providing precise refrigerant injection control across a wide range of 10–100% capacity. Designed for integration with ADAP-KOOL® series controllers from Danfoss.
Key Features and Benefits
- PWM control – precise regulation without waste: valve opens and closes in a 6-second cycle according to the controller signal. The ratio of opening time to closing time determines the current capacity – from 10 to 100% – allowing refrigerant injection to be precisely matched to instantaneous cooling demand.
- Dual function – expansion valve and solenoid valve: when cooling is not needed, AKVH 10 remains tightly closed (leakage < 0.02% of Cv value), eliminating the need for an additional liquid solenoid valve in the system.
- Replaceable orifice and replaceable filter: worn or damaged orifice and 100 µm filter can be replaced on-site without valve disassembly – lower service costs and reduced installation downtime.
- Turbulent flow for better distribution and oil return: orifice design generates turbulence downstream of the valve, ensuring uniform refrigerant distribution in the manifold and facilitating oil return flow to the compressor.
- Max. operating pressure 90 bar: critical in transcritical CO2 systems (R744), where high-side pressures may exceed 100 bar – valve has sufficient safety margin for transcritical operation.
- Energy-saving algorithms: integration with ADAP-KOOL® controllers enables minimum stable superheat (MSS) function and adaptive defrost, directly reducing energy consumption of the entire system.
- Wide range of compatible coils: available coils for 120 V, 208 V and 240 V (50/60 Hz) in NEMA 2 terminal box (IP 12–32) or NEMA 4 conduit connection (IP 54) versions – flexible selection to meet electrical and environmental requirements.
Technical Data
| Parameter | Value |
|---|---|
| Catalog Number | 068F4058 / 068F4088 |
| Type | AKVH 10-0 – normally closed (NC), PWM control |
| Refrigerant | R744 (CO2) |
| Orifice Number | 0 – replaceable |
| Flow Coefficient Cv | 0.132 gal/min |
| Nominal Capacity – Cooling | 0.1 TR |
| Nominal Capacity – Freezing | 0.2 TR |
| Control Range | 10 – 100% |
| PWM Period | 6 seconds |
| Connection inlet / outlet | Brazed 10 mm × 12 mm ODF |
| Flow Direction | Angle |
| Max. Operating Pressure | 90 bar / 1305 psig |
| MOPD (max. pressure difference for opening) | 30 bar / 435 psi |
| Min. Pressure Difference for Opening | 0 bar (no 916;p required) |
| Orifice Opening Size | 0.3 mm |
| Seat Leakage | < 0.02% of Cv value |
| Internal Filter | 100 µm, replaceable |
| Medium Temperature | –60 to +60 °C / –76 to +140 °F |
| Ambient Temperature | –50 to +50 °C / –58 to +122 °F |
| Valve Weight (without coil) | 0.38 kg / 0.84 lbs |
| Approvals | PED 97/23/EC (A3.P3), LVD 73/23/EC, EN 60730-2-8 |
AKVH 10-0 Capacity for R744 as a Function of Pressure Difference
Capacity determined at: te = –25 °C (–13 °F), subcooling 916;tsub = 4 K (7.2 °F), superheat 916;tsup = 5 K (9 °F).
| 916;p [bar] | 2.0 | 4.0 | 6.0 | 8.0 | 10.0 | 12.0 | 14.0 | 16.0 | 20.0 | 30.0 |
|---|---|---|---|---|---|---|---|---|---|---|
| 916;p [psi] | 29 | 58 | 87 | 116 | 145 | 174 | 203 | 232 | 290 | 435 |
| Capacity [TR] | 0.094 | 0.125 | 0.151 | 0.168 | 0.185 | 0.199 | 0.208 | 0.216 | 0.227 | 0.242 |
When selecting a valve, choose an orifice so that at nominal 916;p the valve operates at 50–75% opening. For precise selection, the Coolselector®2 tool available on the Danfoss website is recommended.
Available Coils for AKVH 10
| Coil Type | Voltage [V AC] | Frequency [Hz] | Power [W] | Enclosure | Code |
|---|---|---|---|---|---|
| BJ120BS | 120 | 60 | 16 | NEMA 2 Terminal Box (IP 12–32) | 018F4130 |
| BJ208BS | 208 | 60 | 16 | NEMA 2 Terminal Box (IP 12–32) | 018F4132 |
| BJ240BS | 240 | 60 | 16 | NEMA 2 Terminal Box (IP 12–32) | 018F4134 |
| BX120BS | 120 | 60 | 16 | NEMA 4 Conduit Connection (IP 54) | 018F4131 |
| BX208BS | 208 | 60 | 16 | NEMA 4 Conduit Connection (IP 54) | 018F4133 |
| BX240BS | 240 | 60 | 16 | NEMA 4 Conduit Connection (IP 54) | 018F4135 |
Coils sold separately. Power consumption: pull-in 49 VA (inrush), holding 28 VA / 16 W. Winding insulation class: H (per IEC 85).
Available Orifices for AKVH 10 Series for R744
| Orifice Number | Cv [gal/min] | Nom. Capacity – Cooling [TR] | Nom. Capacity – Freezing [TR] | Connection | Code (single pack) | Code (industrial 32 pcs.) |
|---|---|---|---|---|---|---|
| 0 | 0.132 | 0.1 | 0.2 | 10 × 12 mm | 068F4088 | 068F4058 (this product) |
| 1 | 0.044 | 0.3 | 0.6 | 10 × 12 mm | 068F4089 | 068F4059 |
| 2 | 0.074 | 0.5 | 1.0 | 10 × 12 mm | 068F4090 | 068F4060 |
| 3 | 0.110 | 0.7 | 1.5 | 10 × 12 mm | 068F4091 | 068F4061 |
| 4 | 0.202 | 1.2 | 2.5 | 10 × 12 mm | 068F4092 | 068F4062 |
| 5 | 0.282 | 1.9 | 3.8 | 10 × 12 mm | 068F4093 | 068F4063 |
| 6 | 0.502 | 3.0 | 6.1 | 10 × 12 mm | 068F4094 | 068F4064 |
Applications
- Refrigeration and freezing systems with R744 (CO2) refrigerant – subcritical and transcritical
- Commercial refrigerated display cases and freezers powered by CO2
- R744 heat pumps
- Systems requiring control with ADAP-KOOL® series controllers (e.g. AK-CC, AK-PC)
- OEM applications where high reliability and large pressure margin are required
Manufacturer Documentation:
FAQ – Frequently Asked Questions
Is AKVH 10-0 (068F4058) suitable for refrigerants other than R744?
No. The AKVH 10 series is designed and certified exclusively for R744 (CO2). For other refrigerants (R134a, R404A, R290, etc.), Danfoss offers separate series of electronic expansion valves, such as AKV.
What is the difference between 068F4058 and 068F4088?
Both codes refer to AKVH 10-0 valve with 10 × 12 mm connection and identical technical specifications. The only difference is in packaging: 068F4058 is industrial packaging (32 pcs.), while 068F4088 is single unit packaging (1 pc.) – intended for service and small orders.
Is the coil included with the valve?
No. AKVH 10-0 valve (068F4058) is sold without coil. The coil must be ordered separately, selecting the voltage (120 / 208 / 240 V AC, 60 Hz) and enclosure type (NEMA 2 terminal box or NEMA 4 conduit connection). The list of available coils with codes is shown in the table above.
What is the maximum operating pressure of the valve?
The maximum operating pressure is 90 bar (1305 psig) – applies to system shutdown conditions. During normal operation, the valve inlet must contain liquid. The maximum allowable pressure difference for opening (MOPD) is 30 bar / 435 psi with standard AC 10 W coil.
How does PWM control work in the AKVH valve?
In each 6-second cycle, the ADAP-KOOL® controller sends a voltage signal that opens the valve, then closes it. The ratio of opening time to total cycle duration (duty cycle) determines the current cooling capacity – from 10% at low demand to 100% at full load. When cooling is not required, the valve remains tightly closed and acts as a solenoid valve.
Can the orifice and filter be replaced without disassembling the valve from the system?
Yes. Both the orifice assembly and the 100 µm internal filter are replaceable on-site. Replacement orifice parts for #0 orifice are available under code 068F5283 (set of 4 orifices + 4 seals). This simplifies system service without requiring brazing and system refilling.
How should the correct orifice size be selected?
Orifice selection is based on the required evaporator capacity, pressure difference across the valve, and adjustment for subcooling and evaporating temperature. Danfoss recommends using the Coolselector®2 tool so that at nominal capacity the valve operates at 50–75% opening – ensuring control margin and stable operation.