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Brand: Danfoss
Danfoss 003N0042 AVTA 15 Thermostatic Water Valve, G 1/2
Description
AVTA 15: a self-acting thermostatic water valve for temperature control
Danfoss 003N0042 is an AVTA 15 thermostatic water valve with G 1/2 internal threads (ISO 228-1), a brass body and a Kv value of 1.9 m3/h. The sensor is a 9.5 x 180 mm bulb at the end of a 2000 mm capillary, with a mass charge, and the setting range is 0 to 30 C. The valve opens as the sensor temperature rises, a so-called direct-acting, self-acting control that needs no power.
The maximum working pressure is 16 bar (232 psig), the medium temperature range is -25 to 130 C, the maximum sensor temperature is 57 C and the maximum pressure on the sensor is 25 bar. The maximum differential pressure is 10 bar. Approvals shown are EAC, PED, RoHS and UA.
Technical specifications
| Parameter | Specification |
|---|---|
| Danfoss code number | 003N0042 |
| Type | AVTA 15 |
| Approvals as listed | EAC; PED; RoHS; RoHS China; UA |
| Body material | Brass |
| Capillary tube gland Int/Ext | Internal |
| Capillary tube gland size | 1/2 |
| Capillary tube gland standard | ISO 228-1 |
| Capillary tube gland type | G |
| Capillary tube length | 2000 mm |
| Charge type | Mass |
| Connection Internal/External | Internal |
| Connection size | 1/2 |
| Connection standard | ISO 228-1 |
| Connection type | G |
| Differential pressure | 0 bar to 10 bar |
| Kv value | 1.9 m3/h |
| Max. pressure on sensor | 25 bar |
| Max. sensor temperature | 57 C |
| Max. test pressure Pe | 25 bar |
| Maximum working pressure | 16 bar |
| Media | Neutral media |
| Medium temperature range | -25 C to 130 C |
| Opening configuration | Opens on rising sensor temp. |
| Orifice size | 15 mm |
| Sensor size (Ø x L) | 3/8 x 7 3/32 in / 9.5 x 180 mm |
| Temperature range | 0 C to 30 C |
| Net weight | 1.146 kg |
| EAN | 5702423002801 |
Self-acting temperature control with water
The AVTA controls the flow of neutral media such as water through a heat exchanger according to the temperature sensed by the bulb: for example, cooling a process oil, a compressor jacket or an engine, or controlling hot-water temperature in a calorifier. Brochures name district heating and boiler applications.
The sensor sits in a pocket in the controlled medium; as the temperature rises, the filling expands and pushes the valve open. A rise of a few kelvin gives the full flow, so the control is proportional. The valve closes on a spring when the temperature falls.
Sizing and ordering notes
Choose the valve size from the water flow and the available pressure drop with Kv 1.9 m3/h at 1 bar. The capillary gland is G 1/2 internal, so use the correct sensor pocket and fittings from the accessories list. Install the valve in the flow or return as the application needs, with the arrow in flow direction.
Confirm the temperature setting range, the medium (neutral media), the connection thread and the sensor pocket before ordering. The AVTA data sheet gives the range tables for the AVTA 10 to 25 and the installation guide the setting method.
Other types and sizes from the same Danfoss family that appear in the Danfoss store listing include AVTA 20 (003N0031), AVTA 25 (003N0032), AVTA 10 (003N1132). These are listed for orientation only; each has its own datasheet values, so check size, connection and version before ordering.
Related Danfoss products: Danfoss AVTA Thermostatic Water Valve, Danfoss 068U4281 TCAE Thermostatic Expansion Valve R22/R407C, Danfoss 068Z2900 TE 2 Thermostatic Expansion Valve R744 (CO2), Danfoss 034G4209 ETS 12.5 Electric Expansion Valve, 1/2 in ODF, Danfoss 068U1718 TUBE Thermostatic Expansion Valve R404A/R507A and Danfoss 042H2025 AKV 20-3 Electric Expansion Valve, 42 mm ODF.
Documents and quotation
For the full drawings, ordering tables and wiring or piping details, open the attached Danfoss Thermo. operated water valve, AVTA AI556225870665en-000101 (manufacturer, unaltered) (manufacturer PDF, unaltered). More items of this kind are listed under control valves. Seven Star LLC supplies from Muscat as an independent supplier: ask for a quotation on 003N0042.
Datasheets & Documents
- Datasheet Danfoss Thermo. operated water valve, AVTA AI556225870665en-000101 (manufacturer, unaltered) Download
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About brand
Danfoss is the Danish engineering group that makes refrigeration and air-conditioning controls, heating components, variable speed drives and mobile hydraulics. Mads Clausen founded it on 1 September 1933 at his parents' farm in Nordborg on the island of Als, after making his first refrigeration expansion valve in 1932. Nordborg is still the group's headquarters, and Danfoss remains controlled by the Clausen family through the Bitten & Mads Clausen Foundation.
Danfoss company profile
| Founded | 1 September 1933, Nordborg, Denmark, by Mads Clausen (1905–1966) |
|---|---|
| First product | Thermostatic expansion valve for refrigeration |
| Headquarters | Nordborg, Denmark |
| Ownership | Private; majority controlled by the Bitten & Mads Clausen Foundation and the Clausen family |
| Size | About 42,000 employees (2023) |
| Business segments | Danfoss Climate Solutions (refrigeration, air conditioning and heating), Danfoss Drives (VLT and VACON frequency converters, soft starters), Danfoss Power Solutions (mobile and industrial hydraulics) |
| Brands in the group | VLT, VACON, Eaton Hydraulics (bought 2021), Ikusi radio remote controls |
Milestones
- 1932–1933: First expansion valve; the company is founded in Nordborg.
- 1939: 26 employees. By the 10th anniversary in 1943 the company has 179.
- 1950s: Rapid growth turns Nordborg into a Danfoss town with housing and schools for its workforce.
- 1968: Danfoss launches its VLT frequency converter, one of the first mass-produced AC drives.
- 2014: Acquisition of the Finnish drives maker Vacon, now the VACON brand.
- 2021: Acquisition of Eaton's hydraulics business.
Choosing Danfoss products
For solenoid valves, check the operating principle. A direct-operated valve such as EV210B opens even at 0 bar differential pressure. A servo-operated valve such as EV220B needs a minimum differential (typically about 0.3 bar) to open, while an assisted-lift valve such as EV250B works from 0 bar. Coils are ordered separately, so the voltage on the coil (for example 230 V AC or 24 V DC) must match the control circuit. For drives, the VLT family is split by application: FC 51 Micro Drive for small machines, FC 102 HVAC Drive for fans and pumps in buildings, FC 202 AQUA Drive for water, and FC 302 AutomationDrive for demanding industrial duty.
Where Danfoss products are used
In Oman and the GCC, Danfoss drives run pumps, fans and compressors in district cooling plants, water and wastewater stations, desalination and building HVAC. Danfoss pressure switches, transmitters and solenoid valves are built into chillers, refrigeration plants, boilers and hydraulic systems, and AB-QM valves balance chilled-water circuits in large buildings.
Danfoss products we list
| Family | Examples |
|---|---|
| Variable speed drives and soft starters | VLT Micro Drive FC 51, VLT HVAC Drive FC 102, VLT AQUA Drive FC 202, VLT AutomationDrive FC 302, FC 280, iC2-Micro, VACON NXP, MCD 600 soft starter |
| Solenoid valves and coils | EV220B, EV210B, EV250B, EV225B steam, EVR 25, AM230C coil |
| Pressure switches and thermostats | KP 37, KP 44, RT 200, CS, MBC 5000, KPS 77, RT 101 |
| Pressure transmitters | MBS 3000, MBS 5100, MBS 3250, MBS 4251 Ex, AKS 33, DST P92S SIL 2 |
| HVAC and refrigeration valves | AB-QM PICV, NovoCon S, AB-PM, AVTA, ICV, TE 5 element |
Ordering Danfoss products: what we need
Send the Danfoss code number from the label (for example 032U7115 or 131B0149) or the full drive type code (FC-302P3K0T5...). For drives, add the motor power, supply voltage and any fieldbus option. For valves, add the size, connection, medium and coil voltage. For pressure switches and transmitters, add the range, output and pressure connection.
Facts checked against Danfoss's company history pages and published company data, October 2026.
Browse Danfoss products by category: AC Drives, Pressure Instrumentation, Control Valves, Solenoid Valve.
FAQ
Questions about the Danfoss 003N0042 AVTA 15 Thermostatic Water Valve,
Answers from our engineering team on installation, compatibility and integration.
01What is Danfoss 003N0042?
An AVTA 15 thermostatic water valve with G 1/2 threads, a brass body and a 2 m capillary.
02What temperature range can it control?
0 to 30 C setting range; the maximum sensor temperature is 57 C.
03Does it need electrical power?
No, it is self-acting.
04What is the Kv value?
1.9 m3/h.
05Which document is attached?
The Danfoss thermo-operated water valve AVTA data sheet AI556225870665en-000101.
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