The Belimo B250+AFRXUP N4 is a 2 in. 2-way characterized control valve (CCV), Cv 57, with a stainless steel ball and stem, assembled with the Belimo AFRXUP N4 spring-return fail-safe actuator for on/off control on a 24-240 VAC / 24-125 VDC supply.
A no Disc (full flow) characterized disc gives the valve an equal percentage flow characteristic. Rated 400 psi body pressure and 200 psi close-off, for chilled or hot water, up to 60% glycol from 0...250°F [-18...120°C].
Best For
- Heating and cooling coils in air handling units
- Fan coil unit heating and cooling coils
- Unit ventilators
- VAV box reheat coils
- Bypass loops
- Hydronic systems with variable flow
Warranty
This Belimo characterized control valve product carries a 5-year warranty on all components from the date of production, with the first two years unconditional.
Key Features
Characterized Disc
No Disc (full flow) disc produces an equal percentage flow characteristic.
Spring-Return Fail-Safe
AFRXUP N4 is a spring-return fail-safe actuator: fail-safe direction reversible with cw/ccw mounting; fail-safe running time <20 s.
On/Off Control
AFRXUP N4 accepts on/off control.
NEMA 4X Housing
Degree of protection NEMA 4X.
Pressure Ratings
400 psi body pressure rating, 200 psi close-off pressure.
Ball and Stem
Stainless steel ball, stainless steel stem, PTFE seat.
ZOT Supply is an authorized distributor of Belimo products.
Technical Specifications
| Valve: Belimo B250 | |
|---|---|
| Valve Size | 2" [50] |
| Fluid | chilled or hot water, up to 60% glycol |
| Fluid Temperature Range | 0...250°F [-18...120°C] |
| Close-Off Pressure (∆ps) | 200 psi |
| Flow Characteristic | equal percentage |
| Leakage Rate | 0% for A–AB |
| Pipe Connection | Internal thread NPT (female) |
| Servicing | maintenance-free |
| Flow Pattern | 2-way |
| Controllable Flow Range | 75° |
| Characterized Disc | None |
| Valve Body | nickel-plated brass body |
| Stem | stainless steel |
| Stem Seal | EPDM (lubricated) |
| Seat | PTFE |
| Characterized Disc | No Disc (full flow) |
| O-ring | EPDM (lubricated) |
| Ball | stainless steel |
| Cv | 57 |
| Body Pressure Rating | 400 psi |
| Flow Rate @ 4 psi Pressure Drop | 114 GPM |
| Valve Weight | 2.8 lb [1.3 kg] |
| Actuator: Belimo AFRXUP N4 | |
|---|---|
| Nominal voltage | AC 24...240 V / DC 24...125 V |
| Nominal voltage frequency | 50/60 Hz |
| Nominal voltage range | AC 19.2...264 V / DC 21.6...137.5 V |
| Power consumption in operation | 7W |
| Power consumption in rest position | 3.5 W |
| Overload Protection | electronic throughout 0...95° rotation |
| Direction of motion motor | selectable by ccw/cw mounting |
| Direction of motion fail-safe | reversible with cw/ccw mounting |
| Manual override | 5 mm hex crank (3/16" Allen), supplied |
| Angle of rotation | 90° |
| Running Time (Motor) | 75 s / 90° |
| Running time fail-safe | <20 s |
| Sound power level motor | 45 dB(A) |
| Sound power level, fail-safe | 62 dB(A) |
| Position indication | Mechanical |
| Power Source (UL) | Class 2 Supply |
| Degree of Protection (NEMA/UL) | NEMA 4X |
| Housing | UL Enclosure Type 4X |
| Agency Listing | cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. to 2014/30/EU and 2014/35/EU |
| Quality Standard | ISO 9001 |
| Ambient humidity | Max. 100% RH |
| Ambient temperature | -22...122°F [-30...50°C] |
| Ambient temperature note | -40...122°F [-40...50°C] for actuator with integrated heating |
| Storage temperature | -40...176°F [-40...80°C] |
| Servicing | maintenance-free |
| Housing material | Die cast aluminium and plastic casing |
| Actuator Weight | 6.6 lb [3.0 kg] |
Compatible Accessories
Belimo accessories for the B250+AFRXUP N4, available from ZOT Supply.
Valve Accessories
Documentation
Belimo B250+AFRXUP N4 Technical Data Sheet (Valve + Actuator)Belimo N4 Heater Add-on 230V -Y Technical Data SheetCCV 4-Pin Removal Installation InstructionsCCV Installation InstructionsCharacterized Control Valve (CCV) Technical DocumentationCCV Accessories DocumentationElectronic Valve Applications GuideBelimo Ball Valve Master FormatSuccess Story: Habitat for Humanity Home with Belimo CCVSuccess Story: New York PostSuccess Story: Sonoma State University RenovationSuccess Story: Western Wyoming Community CollegeFrequently Asked Questions
What is the Cv of the Belimo B250+AFRXUP N4?
The B250 valve is rated Cv 57. At a 4 psi pressure drop it passes 114 GPM of water.
What size and pipe connection does the B250+AFRXUP N4 use?
2 in. (2" [50]) with internal thread NPT (female) connections.
Is the B250+AFRXUP N4 fail-safe?
Yes. The AFRXUP N4 is a spring-return fail-safe actuator. Fail-safe running time: <20 s.
What control signal does the B250+AFRXUP N4 accept?
The AFRXUP N4 accepts on/off control.
What power supply does the B250+AFRXUP N4 need?
Nominal voltage AC 24...240 V / DC 24...125 V.
What warranty does the B250+AFRXUP N4 have?
A Belimo 5-year warranty on all components from the date of production, with the first two years unconditional.
What accessories are available for the B250+AFRXUP N4?
ZOT Supply carries these compatible Belimo accessories: ZS-CCV-110 (Weather shield for characterized control valves, fits AFRB(X) actuators).
What is the close-off pressure of the B250+AFRXUP N4?
200 psi close-off pressure, with a 400 psi body pressure rating.
What fluids can the B250+AFRXUP N4 control?
Chilled or hot water, up to 60% glycol, fluid temperature range 0...250°F [-18...120°C].
Specifications per Belimo B250 technical data sheet (2026-09-28) and Belimo AFRXUP N4 technical data sheet (2026-08-18); flow rate per Belimo CCV Technical Documentation (P10419 - 09/13); weather shield fit per Belimo CCV Technical Documentation (P10419 - 09/13); warranty per Belimo CCV Master Format, Section 230923.11. Content updated November 2026.
- Valve Pattern:
- 2-Way
- Valve Size:
- 2 Inch
- CV Rating:
- 57
- GPM:
- 114 @ 4 psi
- Material:
- Stainless Steel
- Actuator Type:
- Fail-Safe
- Voltage:
- 24 to 240 VAC / 24 to 125 VDC
- Control Signal:
- On/Off
- Auxillary Switch:
- None
- Enclosure:
- NEMA 4X
