The Belimo B221+LF120-S US is a 3/4 in. 2-way characterized control valve (CCV), Cv 24, with a stainless steel ball and stem, assembled with the Belimo LF120-S US spring-return fail-safe actuator for on/off control on a 120 VAC supply.
A TEFZEL® characterized disc gives the valve an equal percentage 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 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 equal percentage flow characteristic.
Spring-Return Fail-Safe
LF120-S 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 Control
LF120-S US accepts on/off control.
Auxiliary Switch
1x SPDT, 1 mA...3 A (0.5 A inductive), DC 5 V...AC 250 V, adjustable 0...95°.
Pressure Ratings
600 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 B221 | |
|---|---|
| Valve Size | 0.75" [20] |
| 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 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 | 24 |
| Characterized Disc | None |
| 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 | 48 GPM |
| Valve Weight | 0.90 lb [0.41 kg] |
| Actuator: Belimo LF120-S US | |
|---|---|
| Nominal voltage | AC 120 V |
| Nominal voltage frequency | 50/60 Hz |
| Nominal voltage range | AC 96...132 V |
| Power consumption in operation | 5.5 W |
| Power consumption in rest position | 3.5 W |
| Transformer sizing | 7.5 VA |
| Auxiliary switch | 1x SPDT, 1 mA...3 A (0.5 A inductive), DC 5 V...AC 250 V, adjustable 0...95° |
| Switching capacity auxiliary switch | 1 mA...3 A (0.5 A inductive), DC 5 V...AC 250 V |
| Electrical Connection | (2) 18 AWG appliance cables, 1 m, with 1/2" NPT conduit connectors |
| Overload Protection | electronic throughout 0...95° rotation |
| 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) | 75 s / 90° |
| 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 |
| 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 |
Documentation
Belimo B221+LF120-S 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 B221+LF120-S US?
The B221 valve is rated Cv 24. At a 4 psi pressure drop it passes 48 GPM of water.
What size and pipe connection does the B221+LF120-S US use?
3/4 in. (0.75" [20]) with internal thread NPT (female) connections.
Is the B221+LF120-S US fail-safe?
Yes. The LF120-S 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 B221+LF120-S US accept?
The LF120-S US accepts on/off control.
What power supply does the B221+LF120-S US need?
Nominal voltage AC 120 V. Transformer sizing: 7.5 VA.
What warranty does the B221+LF120-S US 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 B221+LF120-S US?
200 psi close-off pressure, with a 600 psi body pressure rating.
What fluids can the B221+LF120-S US control?
Chilled or hot water, up to 60% glycol, fluid temperature range 0...250°F [-18...120°C].
Specifications per Belimo B221 technical data sheet (2026-02-07) and Belimo LF120-S US technical data sheet (2025-12-23); 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:
- 3/4 Inch
- CV Rating:
- 24
- GPM:
- 48 @ 4 psi
- Material:
- Stainless Steel
- Actuator Type:
- Fail-Safe
- Voltage:
- 120VAC
- Control Signal:
- On/Off
- Auxillary Switch:
- Yes
- Enclosure:
- NEMA 2
