The Belimo B325-740-700+NRX24-SR is a 1 in. 6-way characterized control valve (CCV), Seq 1 Cv 7.4 / Seq 2 Cv 7, with a chrome plated brass ball and nickel plated brass stem, assembled with the Belimo NRX24-SR non fail-safe actuator for modulating 2...10 V control on a 24 VAC/DC supply.
A chrome plated steel characterized disc gives the valve a linear flow characteristic. Rated 232 psi body pressure and 50 psi close-off, for chilled or hot water, up to 60% glycol from 43...180°F [6...82°C].
Best For
- Fan coil units
- Chilled beams
- Radiant ceilings
- Single-coil heating and cooling without a separate change-over valve
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
chrome plated steel disc produces a linear 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
232 psi body pressure rating, 50 psi close-off pressure.
Ball and Stem
Chrome plated brass ball, nickel-plated brass stem, PTFE seat.
ZOT Supply is an authorized distributor of Belimo products.
Technical Specifications
| Valve: Belimo B325-740-700 | |
|---|---|
| Valve Size | 1" [25] |
| Fluid | chilled or hot water, up to 60% glycol |
| Fluid Temperature Range | 43...180°F [6...82°C] |
| Body Pressure Rating | 232 psi |
| Close-Off Pressure (∆ps) | 50 psi |
| Differential pressure Δpmax | 15psi |
| Flow Characteristic | linear |
| Servicing | maintenance-free |
| Flow Pattern | 6-way |
| Leakage Rate | 0% |
| Controllable Flow Range | sequence 1 (angle 0...30°), dead zone (30...60°), sequence 2 (angle 60...90°) |
| Seq 1 Cv | 7.4 |
| Seq 2 Cv | 7 |
| Valve Body | Nickel-plated brass body |
| Stem | nickel-plated brass |
| Stem Seal | EPDM (lubricated) |
| Seat | PTFE |
| Characterized Disc | chrome plated steel |
| Pipe Connection | NPT |
| O-ring | EPDM |
| Ball | chrome plated brass |
| Valve Weight | 7.9 lb [3.6 kg] |
| Actuator: Belimo NRX24-SR | |
|---|---|
| Nominal voltage | AC/DC 24 V |
| Nominal voltage frequency | 50/60 Hz |
| Power consumption in operation | 2.5 W |
| Power consumption in rest position | 0.4 W |
| Power consumption for wire sizing | 5 VA |
| Transformer sizing | 5 VA (class 2 power source) |
| Electrical Connection | 18 GA plenum cable, 3 ft [1 m], with 1/2" conduit connector (10 ft [3 m] and 15 ft [5 m] available) |
| Overload Protection | electronic throughout 0...95° 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 | Max. 90° |
| Angle of rotation note | adjustable with mechanical stop |
| Running Time (Motor) | 90 s / 90° |
| Sound power level, motor | 45 dB(A) |
| Position indication | Mechanically, integrated, two-section |
| Degree of Protection (IEC/EN) | IP54 |
| 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; Listed to UL 2043 - suitable for use in air plenums per Section 300.22(c) of the NEC and Section 602.2 of the IMC |
| Quality Standard | ISO 9001 |
| Ambient temperature | -22...122°F [-30...50°C] |
| Storage temperature | -40...176°F [-40...80°C] |
| Ambient humidity | Max. 95% RH, non-condensing |
| Servicing | maintenance-free |
| Housing material | Galvanized steel and plastic housing |
Compatible Accessories
Belimo accessories for the B325-740-700+NRX24-SR, available from ZOT Supply.
Electrical Accessories
Documentation
Belimo B325-740-700+NRX24-SR Technical Data Sheet (Valve + Actuator)belimo_CCV-6-way__installation-instructions_en-us.pdfCCV Installation Instructionsbelimo_6-way_ccv_technical-documentation_en-us.pdfCCV Accessories DocumentationElectronic Valve Applications Guidebelimo_ccv_6-way_brochure_en-us.pdfBelimo 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 B325-740-700+NRX24-SR?
The B325-740-700 valve is rated Seq 1 Cv 7.4 / Seq 2 Cv 7.
What size and pipe connection does the B325-740-700+NRX24-SR use?
1 in. (1" [25]) with nPT connections.
Is the B325-740-700+NRX24-SR fail-safe?
No. The NRX24-SR is a non fail-safe actuator.
What control signal does the B325-740-700+NRX24-SR accept?
The NRX24-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 B325-740-700+NRX24-SR need?
Nominal voltage AC/DC 24 V. Transformer sizing: 5 VA (class 2 power source).
What warranty does the B325-740-700+NRX24-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 B325-740-700+NRX24-SR?
ZOT Supply carries these compatible Belimo accessories: S1A (Auxiliary switch 1x SPDT add-on); S2A (Auxiliary switch 2x SPDT add-on); P140A GR (Feedback potentiometer 140 Ω add-on, grey); P1000A GR (Feedback potentiometer 1 kΩ add-on, grey); P10000A GR (Feedback potentiometer 10 kΩ add-on, grey); P2800A GR (Feedback potentiometer 2.8 kΩ add-on, grey); P500A GR (Feedback potentiometer 500 Ω add-on, grey); P5000A GR (Feedback potentiometer 5 kΩ add-on, grey).
What is the close-off pressure of the B325-740-700+NRX24-SR?
50 psi close-off pressure, with a 232 psi body pressure rating.
What fluids can the B325-740-700+NRX24-SR control?
Chilled or hot water, up to 60% glycol, fluid temperature range 43...180°F [6...82°C].
Specifications per Belimo B325-740-700 technical data sheet (2022-09-27) and Belimo NRB24-SR technical data sheet (2021-08-27), which also covers the NRX24-SR; warranty per Belimo CCV Master Format, Section 230923.11. Content updated November 2026.
- Valve Pattern:
- 6-Way
- Valve Size:
- 1 Inch
- CV Rating:
- 7.4
- CV Rating:
- 7
- Material:
- Chrome Plated Brass
- Actuator Type:
- Non Fail-Safe
- Voltage:
- 24VAC/DC
- Control Signal:
- 2-10VDC
- Auxillary Switch:
- None
- Enclosure:
- NEMA 2
