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Brand: Danfoss
Danfoss 003N8211 FJVA 15 Thermostatic Water Valve with Bypass
Description
FJVA 15: a thermostatic water valve with a built-in bypass for 25 to 65 C control
Danfoss 003N8211 is an FJVA 15 thermostatic water valve with G 1/2 internal threads (ISO 228-1), a brass body, a 15 mm orifice and a Kv value of 1.9 m3/h. The page lists a setting range of 25 to 65 C and a bypass of 2 mm (5/64 in), so a small flow keeps the sensor in contact with the medium even when the valve is closed. The valve opens on rising sensor temperature.
The maximum working pressure is 16 bar (232 psig), the maximum differential 10 bar and the medium temperature range -25 to 130 C, for neutral media. Net weight is 1.122 kg, approvals are EAC, PED, RoHS and UA.
Technical specifications
| Parameter | Specification |
|---|---|
| Danfoss code number | 003N8211 |
| Type | FJVA 15 |
| Approvals as listed | EAC; PED; RoHS; RoHS China; UA |
| Body material | Brass |
| Bypass (Ø) | 5/64 in / 2 mm |
| 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 |
| 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 |
| Temperature range | 25 C to 65 C |
| Net weight | 1.122 kg |
| EAN | 5702423002870 |
The role of the bypass
Where the AVTA fully closes, the FJVA always passes the bypass flow. That keeps warm water moving past the sensor and makes the response more stable in applications such as domestic hot water circulation, cooling of engines and temperature holding in tanks. The FJVA is a related design to the AVTA, sold under the same data-sheet family in the Danfoss store.
The temperature range 25 to 65 C is higher than the 0 to 30 C of the AVTA 15, which fits hot water and heating circuits instead of chilled-water duty. Check that the medium is neutral and the maximum temperature is within the valve limit.
Ordering and installation notes
Place the sensor in a pocket in the medium whose temperature is to be controlled, with the capillary protected. Connect the valve with the arrow in flow direction. The G thread is the ISO standard; do not mix with NPT fittings.
Confirm the setting range, the bypass requirement, the thread and the maximum differential pressure before ordering. See the FJVA data sheet and the FJVA installation guide for the setting procedure. The valve is a mechanical device with no electrical connection, so it can be fitted where no power supply exists, and a failed sensor charge shows up as a valve that stays closed or open, which is why the bypass and an isolating valve ahead of it are good practice in critical circuits.
Related Danfoss products: Danfoss AVTA Thermostatic Water Valve, Danfoss 068U4281 TCAE Thermostatic Expansion Valve R22/R407C, Danfoss 068U1718 TUBE Thermostatic Expansion Valve R404A/R507A, Danfoss 068Z2900 TE 2 Thermostatic Expansion Valve R744 (CO2), Danfoss 034G4209 ETS 12.5 Electric Expansion Valve, 1/2 in ODF and Danfoss 027H1085 ICMTS 20A Motor Valve for Transcritical CO2.
Documents and quotation
The attached file is the Danfoss Thermo. operated water valve, FJVA AI556035562483en-000101 (manufacturer, unaltered). It is the manufacturer’s own PDF, hosted here unaltered. Related items sit under control valves. Seven Star LLC is an independent supplier in Muscat; send the code 003N8211 with the quantity and we will quote.
Datasheets & Documents
- Datasheet Danfoss Thermo. operated water valve, FJVA AI556035562483en-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 003N8211 FJVA 15 Thermostatic Water Valve
Answers from our engineering team on installation, compatibility and integration.
01What is Danfoss 003N8211?
An FJVA 15 thermostatic water valve with G 1/2 threads and a 2 mm bypass, setting range 25 to 65 C.
02What does the bypass do?
It passes a small flow when the valve is closed, so the sensor keeps seeing the process temperature.
03What is the Kv value?
1.9 m3/h.
04What are the pressure limits?
16 bar maximum working pressure and 10 bar maximum differential pressure.
05Which document is attached?
The Danfoss thermo-operated water valve FJVA data sheet AI556035562483en-000101.
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