The Belimo B313+LF24-3 US is a 1/2 in. 3-way mixing/diverting characterized control valve (CCV), Cv 4.7, with a stainless steel ball and stem, assembled with the Belimo LF24-3 US spring-return fail-safe actuator for on/off or floating point control on a 24 VAC/DC supply.
A TEFZEL® characterized disc gives the valve an A-port equal percentage, B-port modified for constant common port flow flow characteristic. Rated 600 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 or constant 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
TEFZEL® disc produces an A-port equal percentage, B-port modified for constant common port flow flow characteristic.
Spring-Return Fail-Safe
LF24-3 US is a spring-return fail-safe actuator: fail-safe direction reversible with cw/ccw mounting; fail-safe running time <25 s @ -20...50°C, <60 s @ -30°C.
On/Off or Floating Point
LF24-3 US accepts on/off or floating point control.
Pressure Ratings
600 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 B313 | |
|---|---|
| Valve Size | 0.5" [15] |
| Fluid | chilled or hot water, up to 60% glycol |
| Fluid Temperature Range | 0...250°F [-18...120°C] |
| Body Pressure Rating | 600 psi |
| Close-Off Pressure (∆ps) | 200 psi |
| Flow | A-port: as stated in chart B-port: 70% of A–AB Cv |
| Flow Characteristic | A-port equal percentage, B-port modified for constant common port flow |
| Leakage Rate | 0% for A–AB, <2.0% for B–AB |
| Pipe Connection | Internal thread NPT (female) |
| Servicing | maintenance-free |
| Flow Pattern | 3-way Mixing/Diverting |
| Controllable Flow Range | 75° |
| Cv | 4.7 |
| Valve Body | Nickel-plated brass body |
| Stem | stainless steel |
| Stem Seal | EPDM (lubricated) |
| Seat | PTFE |
| Characterized Disc | TEFZEL® |
| O-ring | EPDM (lubricated) |
| Ball | stainless steel |
| Flow Rate @ 4 psi Pressure Drop | 9.4 GPM |
| Valve Weight | 0.71 lb [0.32 kg] |
| Actuator: Belimo LF24-3 US | |
|---|---|
| Nominal voltage | AC/DC 24 V |
| Nominal voltage frequency | 50/60 Hz |
| Nominal voltage range | AC 19.2...28.8 V / DC 21.6...28.8 V |
| Power consumption in operation | 2.5 W |
| Power consumption in rest position | 1W |
| Transformer sizing | 5 VA |
| Electrical Connection | 18 AWG appliance cable, 1 m, with 1/2" NPT conduit connector |
| Overload Protection | electronic throughout 0...95° rotation |
| Position feedback U note | No Feedback |
| Direction of motion motor | selectable with switch 0/1 |
| Direction of motion fail-safe | reversible with cw/ccw mounting |
| Angle of rotation | 90° |
| Running Time (Motor) | 150 s / 90° |
| Running time motor note | constant, independent of load |
| Running time fail-safe | <25 s @ -20...50°C, <60 s @ -30°C |
| Sound power level, motor | 50 dB(A) |
| Sound power level, fail-safe | 62 dB(A) |
| Position indication | Mechanical |
| Power Source (UL) | Class 2 Supply |
| Degree of Protection (IEC/EN) | IP54 |
| Degree of Protection (NEMA/UL) | NEMA 2 |
| Housing | UL Enclosure Type 2 |
| Agency Listing | cULus acc. To UL 873 and CAN/CSA C22.2 No. 24-93 |
| 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 |
| Actuator Weight | 3.3 lb [1.5 kg] |
Compatible Accessories
Belimo accessories for the B313+LF24-3 US, available from ZOT Supply.
Valve Accessories
Documentation
Belimo B313+LF24-3 US Technical Data Sheet (Valve + Actuator)LF Actuator on CCV / PICCV / HTCCV 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 B313+LF24-3 US?
The B313 valve is rated Cv 4.7. At a 4 psi pressure drop it passes 9.4 GPM of water.
What size and pipe connection does the B313+LF24-3 US use?
1/2 in. (0.5" [15]) with internal thread NPT (female) connections.
Is the B313+LF24-3 US fail-safe?
Yes. The LF24-3 US is a spring-return fail-safe actuator. Fail-safe running time: <25 s @ -20...50°C, <60 s @ -30°C.
What control signal does the B313+LF24-3 US accept?
The LF24-3 US accepts on/off or floating point control.
What power supply does the B313+LF24-3 US need?
Nominal voltage AC/DC 24 V. Transformer sizing: 5 VA.
What warranty does the B313+LF24-3 US 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 B313+LF24-3 US?
ZOT Supply carries these compatible Belimo accessories: ZS-CCV-90 (Weather shield for characterized control valves, fits LF actuators).
What is the close-off pressure of the B313+LF24-3 US?
200 psi close-off pressure, with a 600 psi body pressure rating.
What fluids can the B313+LF24-3 US control?
Chilled or hot water, up to 60% glycol, fluid temperature range 0...250°F [-18...120°C].
Specifications per Belimo B313 technical data sheet (2026-02-07) and Belimo LF24-3 US technical data sheet (2025-12-23); 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:
- 3-Way
- Valve Size:
- 1/2 Inch
- CV Rating:
- 4.7
- GPM:
- 9.4 @ 4 psi
- Material:
- Stainless Steel
- Actuator Type:
- Fail-Safe
- Voltage:
- 24VAC/DC
- Control Signal:
- On/Off, Floating Point
- Auxillary Switch:
- None
- Enclosure:
- NEMA 2
