The Belimo B6400S-186+GKRX24-MFT N4 is a 4 in. 2-way characterized control valve (CCV), Cv 186, with a stainless steel ball and stem, assembled with the Belimo GKRX24-MFT N4 electronic fail-safe actuator for MFT programmable control on a 24 VAC/DC supply.
A stainless steel characterized disc gives the valve an equal percentage flow characteristic. Rated ANSI Class 125, standard class B body pressure and 175 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.
Electronic Fail-Safe
GKRX24-MFT N4 is an electronic fail-safe actuator: fail-safe direction reversible with switch; fail-safe running time <35 s.
MFT Programmable
Operating range Y 2...10 V; optional modes variable (VDC, on/off, floating point).
NEMA 4X Housing
Degree of protection NEMA 4X.
Pressure Ratings
ANSI Class 125, standard class B body pressure rating, 175 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 B6400S-186 | |
|---|---|
| Valve Size | 4" [100] |
| Fluid | chilled or hot water, up to 60% glycol |
| Fluid Temperature Range | 0...250°F [-18...120°C] |
| Body Pressure Rating | ANSI Class 125, standard class B |
| Close-Off Pressure (∆ps) | 175 psi |
| Flow Characteristic | equal percentage |
| Pipe connection type | Flange for use with ASME/ANSI class 125 |
| Servicing | maintenance-free |
| Flow Pattern | 2-way |
| Leakage Rate | 0% for A – AB |
| Controllable Flow Range | 75° |
| Cv | 186 |
| Valve Body | Cast iron - GG 25 |
| 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 | 372 GPM |
| Valve Weight | 50 lb [23 kg] |
| Actuator: Belimo GKRX24-MFT N4 | |
|---|---|
| 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 | 12 W |
| Power consumption in rest position | 3W |
| Transformer sizing | 21 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, 1500 Ω for PWM, On/Off and Floating point |
| Operating range Y variable | Start point 0.5...30 V End point 2.5...32 V |
| Operating modes optional | variable (VDC, on/off, floating point) |
| Position Feedback U | 2...10 V |
| Position feedback U note | Max. 0.5 mA |
| Position feedback U variable | VDC variable |
| Bridging time (PF) | 2s |
| Bridging time (PF) variable | 0...10 s |
| Pre-charging time | 5...20 s |
| Direction of motion motor | selectable with switch 0/1 |
| Direction of motion fail-safe | reversible with switch |
| Manual override | under cover |
| Angle of rotation | Max. 95° |
| Angle of rotation note | adjustable with mechanical stop |
| Running Time (Motor) | 150 s / 90° |
| Running time motor variable | 90...150 s |
| Running time fail-safe | <35 s |
| Sound power level motor | 52 dB(A) |
| Sound power level, fail-safe | 61 dB(A) |
| Position indication | Mechanical, 30...65 mm stroke |
| Power Source (UL) | Class 2 Supply |
| Degree of Protection (NEMA/UL) | NEMA 4X |
| Housing | UL Enclosure Type 4X |
| 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 |
| Ambient humidity | Max. 100% RH |
| Ambient temperature | -22...122°F [-30...50°C] |
| Ambient temperature note | -40...122°F [-40...50°C] for actuator with integrated heating |
| Storage temperature | -40...176°F [-40...80°C] |
| Servicing | maintenance-free |
| Housing material | Die cast aluminium and plastic casing |
| Actuator Weight | 7.5 lb [3.4 kg] |
Compatible Accessories
Belimo accessories for the B6400S-186+GKRX24-MFT N4, available from ZOT Supply.
Electrical Accessories
Gateways
Documentation
Belimo B6400S-186+GKRX24-MFT N4 Technical Data Sheet (Valve + Actuator)Belimo N4 Heater 24V -H Technical Data Sheetbelimo_B6-CCV-GK-N4_installation-instructions.pdfCharacterized Control Valve (CCV) Technical DocumentationElectronic Valve Applications Guidebelimo_electronic-fail-safe-supercap_brochure_en-us.pdfZTH BrochureMP-Bus Technology: Notes for Project PlanningBelimo 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 B6400S-186+GKRX24-MFT N4?
The B6400S-186 valve is rated Cv 186. At a 4 psi pressure drop it passes 372 GPM of water.
What size and pipe connection does the B6400S-186+GKRX24-MFT N4 use?
4 in. (4" [100]) with connections.
Is the B6400S-186+GKRX24-MFT N4 fail-safe?
Yes. The GKRX24-MFT N4 is an electronic fail-safe actuator. Fail-safe running time: <35 s.
What control signal does the B6400S-186+GKRX24-MFT N4 accept?
The GKRX24-MFT N4 accepts MFT programmable control, operating range Y 2...10 V (4...20 mA w/ ZG-R01 (500 Ω, 1/4 W resistor)).
What power supply does the B6400S-186+GKRX24-MFT N4 need?
Nominal voltage AC/DC 24 V. Transformer sizing: 21 VA.
What warranty does the B6400S-186+GKRX24-MFT N4 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 B6400S-186+GKRX24-MFT N4?
ZOT Supply carries these compatible Belimo accessories: P140A GR (Feedback potentiometer 140 Ω add-on, grey); P500A GR (Feedback potentiometer 500 Ω add-on, grey); P1000A GR (Feedback potentiometer 1 kΩ add-on, grey); P2800A GR (Feedback potentiometer 2.8 kΩ add-on, grey); P5000A GR (Feedback potentiometer 5 kΩ add-on, grey); P10000A GR (Feedback potentiometer 10 kΩ add-on, grey); S1A (Auxiliary switch 1x SPDT add-on); S2A (Auxiliary switch 2x SPDT add-on); ZTH US (Service tool, with ZIP-USB function, for programmable and communicative Belimo actuators, VAV controller and HVAC performance devices); UK24BAC (Gateway MP to BACnet MS/TP); UK24MOD (Gateway MP to Modbus RTU); UK24LON (Gateway MP to LonWorks).
What is the close-off pressure of the B6400S-186+GKRX24-MFT N4?
175 psi close-off pressure, with an ANSI Class 125, standard class B body pressure rating.
What fluids can the B6400S-186+GKRX24-MFT N4 control?
Chilled or hot water, up to 60% glycol, fluid temperature range 0...250°F [-18...120°C].
Specifications per Belimo B6400S-186 technical data sheet (2023-08-10) and Belimo GKRX24-MFT N4 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:
- 4 Inch
- CV Rating:
- 186
- GPM:
- 372 @ 4 psi
- Material:
- Stainless Steel
- Actuator Type:
- Fail-Safe
- Voltage:
- 24VAC/DC
- Control Signal:
- MFT Programmable
- Auxillary Switch:
- None
- Enclosure:
- NEMA 4X
