The Belimo B253+ARX120-SR is a 2 in. 2-way characterized control valve (CCV), Cv 120, with a stainless steel ball and stem, assembled with the Belimo ARX120-SR non fail-safe actuator for modulating 2...10 V control on a 100-240 VAC 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.
Modulating Control
Proportional control on 2...10 V (4...20 mA w/ ZG-R01 (500 Ω, 1/4 W resistor)), with 2...10 V position feedback.
Pressure Ratings
400 psi body pressure rating, 200 psi close-off pressure.
Ball and Stem
Stainless steel ball, stainless steel stem, PTFE seat.
Plenum Rated
UL 2043: Suitable for use in air plenums per Section 300.22(C) of the NEC and Section 602 of the IMC.
ZOT Supply is an authorized distributor of Belimo products.
Technical Specifications
| Valve: Belimo B253 | |
|---|---|
| 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 | 120 |
| 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 | 240 GPM |
| Valve Weight | 5.4 lb [2.4 kg] |
| Actuator: Belimo ARX120-SR | |
|---|---|
| Nominal voltage | AC 100...240 V |
| Nominal voltage frequency | 50/60 Hz |
| Nominal voltage range | AC 85...265 V |
| Power consumption in operation | 4W |
| Power consumption in rest position | 1W |
| Transformer sizing | 7.5 VA |
| Overload Protection | electronic thoughout 0...90° rotation |
| Operating Range Y | 2...10 V |
| Operating range Y note | 4...20 mA w/ ZG-R01 (500 Ω, 1/4 W resistor) |
| Input impedance | 100 kΩ for 2...10 V (0.1 mA), 500 Ω for 4...20 mA |
| Position Feedback U | 2...10 V |
| Position feedback U note | Max. 1 mA |
| Direction of motion motor | selectable with switch 0/1 |
| Manual override | external push button |
| Angle of rotation | 90° |
| Angle of rotation note | adjustable with mechanical stop |
| Running Time (Motor) | 90 s / 90° |
| Running time motor variable | 90 or 150 s |
| Sound power level motor | 45 dB(A) |
| Position indication | Mechanical, pluggable |
| 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 | 2.3 lb [1 kg] |
Compatible Accessories
Belimo accessories for the B253+ARX120-SR, available from ZOT Supply.
Valve Accessories
Documentation
Belimo B253+ARX120-SR 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 B253+ARX120-SR?
The B253 valve is rated Cv 120. At a 4 psi pressure drop it passes 240 GPM of water.
What size and pipe connection does the B253+ARX120-SR use?
2 in. (2" [50]) with internal thread NPT (female) connections.
Is the B253+ARX120-SR fail-safe?
No. The ARX120-SR is a non fail-safe actuator.
What control signal does the B253+ARX120-SR accept?
The ARX120-SR accepts modulating 2...10 V control, operating range Y 2...10 V (4...20 mA w/ ZG-R01 (500 Ω, 1/4 W resistor)).
What power supply does the B253+ARX120-SR need?
Nominal voltage AC 100...240 V. Transformer sizing: 7.5 VA.
What warranty does the B253+ARX120-SR 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 B253+ARX120-SR?
ZOT Supply carries these compatible Belimo accessories: ZS-CCV-100 (Weather shield for characterized control valves, fits LRB(X) and ARB(X) actuators).
What is the close-off pressure of the B253+ARX120-SR?
200 psi close-off pressure, with a 400 psi body pressure rating.
What fluids can the B253+ARX120-SR control?
Chilled or hot water, up to 60% glycol, fluid temperature range 0...250°F [-18...120°C].
Specifications per Belimo B253 technical data sheet (2026-02-07) and Belimo ARX120-SR 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:
- 120
- GPM:
- 240 @ 4 psi
- Material:
- Stainless Steel
- Actuator Type:
- Non Fail-Safe
- Voltage:
- 100-240VAC
- Control Signal:
- 2-10VDC
- Auxillary Switch:
- None
- Enclosure:
- NEMA 2
