The Belimo B6400S-186-250+GKRX24-3 N4 is a 4 in. 2-way characterized control valve (CCV), Cv 186, with a stainless steel ball and stem, assembled with the Belimo GKRX24-3 N4 electronic fail-safe actuator for on/off or floating point control on a 24 VAC supply.
A stainless steel characterized disc gives the valve an equal percentage flow characteristic. Rated ANSI Class 250, raised-face body pressure and 310 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
GKRX24-3 N4 is an electronic fail-safe actuator: fail-safe direction reversible with switch; fail-safe running time <35 s.
On/Off or Floating Point
GKRX24-3 N4 accepts on/off or floating point control.
NEMA 4X Housing
Degree of protection NEMA 4X.
Pressure Ratings
ANSI Class 250, raised-face body pressure rating, 310 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-186-250 | |
|---|---|
| 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 250, raised-face |
| Close-Off Pressure (∆ps) | 310 psi |
| Flow Characteristic | equal percentage |
| Pipe connection type | Flange for use with ASME/ANSI class 250 |
| Servicing | maintenance-free |
| Maximum differential pressure (water) | 50 psi [345 kPa] |
| 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 |
| Valve Weight | 70 lb [32 kg] |
| Actuator: Belimo GKRX24-3 N4 | |
|---|---|
| Nominal voltage | AC 24 V |
| Nominal voltage frequency | 50/60 Hz |
| Nominal voltage range | AC 19.2...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 |
| Bridging time (PF) | 2s |
| 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 note | constant, independent of load |
| Running time motor variable | 90 or 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, CSA C22.2 No 24-93, CE acc. to 89/336/EC |
| 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 | 7.7 lb [3.5 kg] |
Documentation
Belimo B6400S-186-250+GKRX24-3 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.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 B6400S-186-250+GKRX24-3 N4?
The B6400S-186-250 valve is rated Cv 186.
What size and pipe connection does the B6400S-186-250+GKRX24-3 N4 use?
4 in. (4" [100]) with connections.
Is the B6400S-186-250+GKRX24-3 N4 fail-safe?
Yes. The GKRX24-3 N4 is an electronic fail-safe actuator. Fail-safe running time: <35 s.
What control signal does the B6400S-186-250+GKRX24-3 N4 accept?
The GKRX24-3 N4 accepts on/off or floating point control.
What power supply does the B6400S-186-250+GKRX24-3 N4 need?
Nominal voltage AC 24 V. Transformer sizing: 21 VA.
What warranty does the B6400S-186-250+GKRX24-3 N4 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 B6400S-186-250+GKRX24-3 N4?
310 psi close-off pressure, with an ANSI Class 250, raised-face body pressure rating.
What fluids can the B6400S-186-250+GKRX24-3 N4 control?
Chilled or hot water, up to 60% glycol, fluid temperature range 0...250°F [-18...120°C].
Specifications per Belimo B6400S-186-250 technical data sheet (2023-08-10) and Belimo GKRX24-3 N4 technical data sheet (2026-08-18); warranty per Belimo CCV Master Format, Section 230923.11. Content updated November 2026.
- Valve Pattern:
- 2-Way
- Valve Size:
- 4 Inch
- CV Rating:
- 186
- Material:
- Stainless Steel
- Actuator Type:
- Fail-Safe
- Voltage:
- 24VAC
- Control Signal:
- On/Off, Floating Point
- Auxillary Switch:
- None
- Enclosure:
- NEMA 4X
