The Belimo B6600S-400+GKRX24-3 is a 6 in. 2-way characterized control valve (CCV), Cv 400, with a stainless steel ball and stem, assembled with the Belimo GKRX24-3 electronic fail-safe actuator for on/off or floating point control on a 24 VAC supply.
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
Electronic Fail-Safe
GKRX24-3 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 accepts on/off or floating point control.
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.
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 B6600S-400 | |
|---|---|
| Valve Size | 6" [150] |
| 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 | 400 |
| Valve Body | Cast iron - GG 25 |
| Stem | stainless steel |
| Stem Seal | EPDM (lubricated) |
| Seat | PTFE |
| O-ring | EPDM (lubricated) |
| Ball | stainless steel |
| Flow Rate @ 4 psi Pressure Drop | 800 GPM |
| Valve Weight | 86 lb [39 kg] |
| Actuator: Belimo GKRX24-3 | |
|---|---|
| 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 throughout 0...95° 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 | external push button |
| 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, pluggable |
| Power Source (UL) | Class 2 Supply |
| 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 |
| 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 | -40...176°F [-40...80°C] |
| Storage temperature | -22...122°F [-30...50°C] |
| Servicing | maintenance-free |
| Housing material | Galvanized steel and plastic housing |
| Actuator Weight | 5.6 lb [2.5 kg] |
Documentation
Belimo B6600S-400+GKRX24-3 Technical Data Sheet (Valve + Actuator)belimo_LGCCV_installation-instructions_en-us.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 B6600S-400+GKRX24-3?
The B6600S-400 valve is rated Cv 400. At a 4 psi pressure drop it passes 800 GPM of water.
What size and pipe connection does the B6600S-400+GKRX24-3 use?
6 in. (6" [150]) with connections.
Is the B6600S-400+GKRX24-3 fail-safe?
Yes. The GKRX24-3 is an electronic fail-safe actuator. Fail-safe running time: <35 s.
What control signal does the B6600S-400+GKRX24-3 accept?
The GKRX24-3 accepts on/off or floating point control.
What power supply does the B6600S-400+GKRX24-3 need?
Nominal voltage AC 24 V. Transformer sizing: 21 VA.
What warranty does the B6600S-400+GKRX24-3 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 B6600S-400+GKRX24-3?
175 psi close-off pressure, with an ANSI Class 125, standard class B body pressure rating.
What fluids can the B6600S-400+GKRX24-3 control?
Chilled or hot water, up to 60% glycol, fluid temperature range 0...250°F [-18...120°C].
Specifications per Belimo B6600S-400 technical data sheet (2023-08-10) and Belimo GKRX24-3 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:
- 6 Inch
- CV Rating:
- 400
- GPM:
- 800 @ 4 psi
- Material:
- Stainless Steel
- Actuator Type:
- Fail-Safe
- Voltage:
- 24VAC
- Control Signal:
- On/Off, Floating Point
- Auxillary Switch:
- None
- Enclosure:
- NEMA 2
