The Belimo B251+AFRBUP-S is a 2 in. 2-way characterized control valve (CCV), Cv 65, with a stainless steel ball and stem, assembled with the Belimo AFRBUP-S spring-return fail-safe actuator for on/off control on a 24-240 VAC / 24-125 VDC supply.
A stainless steel 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
Stainless steel disc produces an equal percentage flow characteristic.
Spring-Return Fail-Safe
AFRBUP-S is a spring-return fail-safe actuator: fail-safe direction reversible with cw/ccw mounting; fail-safe running time <20 s.
On/Off Control
AFRBUP-S accepts on/off control.
Auxiliary Switch
2x SPDT, 1 mA...3 A (0.5 A inductive), DC 5 V...AC 250 V, 1x 10% / 1x 11...90%.
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 B251 | |
|---|---|
| Valve Size | 2" [50] |
| Fluid | chilled or hot water, up to 60% glycol |
| Fluid Temperature Range | 0...250°F [-18...120°C] |
| Body Pressure Rating | 400 psi |
| 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° |
| Cv | 65 |
| Valve Body | Nickel-plated brass body |
| Stem | stainless steel |
| Stem Seal | EPDM (lubricated) |
| Seat | PTFE |
| Characterized Disc | Stainless steel |
| O-ring | EPDM (lubricated) |
| Ball | stainless steel |
| Flow Rate @ 4 psi Pressure Drop | 130 GPM |
| Valve Weight | 5.4 lb [2.4 kg] |
| Actuator: Belimo AFRBUP-S | |
|---|---|
| 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 |
| Transformer sizing | 18 VA |
| Auxiliary switch | 2x SPDT, 1 mA...3 A (0.5 A inductive), DC 5 V...AC 250 V, 1x 10% / 1x 11...90% |
| Switching capacity auxiliary switch | 1 mA...3 A (0.5 A inductive), DC 5 V...AC 250 V |
| 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 2 |
| Housing | UL Enclosure Type 2 |
| 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 |
| UL 2043 Compliant | Suitable for use in air plenums per Section 300.22(C) of the NEC and Section 602 of the IMC |
| Ambient humidity | Max. 95% RH, non-condensing |
| Ambient temperature | -22...122°F [-30...50°C] |
| Storage temperature | -40...176°F [-40...80°C] |
| Servicing | maintenance-free |
| Housing material | Galvanized steel and plastic housing |
| Actuator Weight | 5.7 lb [2.6 kg] |
Documentation
Belimo B251+AFRBUP-S Technical Data Sheet (Valve + Actuator)CCV 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 B251+AFRBUP-S?
The B251 valve is rated Cv 65. At a 4 psi pressure drop it passes 130 GPM of water.
What size and pipe connection does the B251+AFRBUP-S use?
2 in. (2" [50]) with internal thread NPT (female) connections.
Is the B251+AFRBUP-S fail-safe?
Yes. The AFRBUP-S is a spring-return fail-safe actuator. Fail-safe running time: <20 s.
What control signal does the B251+AFRBUP-S accept?
The AFRBUP-S accepts on/off control.
What power supply does the B251+AFRBUP-S need?
Nominal voltage AC 24...240 V / DC 24...125 V. Transformer sizing: 18 VA.
What warranty does the B251+AFRBUP-S have?
A Belimo 5-year warranty on all components from the date of production, with the first two years unconditional.
What is the close-off pressure of the B251+AFRBUP-S?
200 psi close-off pressure, with a 400 psi body pressure rating.
What fluids can the B251+AFRBUP-S control?
Chilled or hot water, up to 60% glycol, fluid temperature range 0...250°F [-18...120°C].
Specifications per Belimo B251 technical data sheet (2026-02-07) and Belimo AFRBUP-S technical data sheet (2026-08-18); flow rate 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:
- 65
- GPM:
- 130 @ 4 psi
- Material:
- Stainless Steel
- Actuator Type:
- Fail-Safe
- Voltage:
- 24 to 240 VAC / 24 to 125 VDC
- Control Signal:
- On/Off
- Auxillary Switch:
- Yes
- Enclosure:
- NEMA 2
