The Belimo B311 is a 1/2 in. 3-way mixing/diverting characterized control valve (CCV) with a stainless steel ball and stem, Cv 1.9 and NPT female connections. It is sold as a valve only, for use with a separately purchased Belimo actuator.
A TEFZEL® characterized disc gives the valve an A-port equal percentage, B-port modified for constant common port flow 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 or constant 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 A-port equal percentage, B-port modified for constant common port flow flow characteristic.
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 B311 | |
|---|---|
| Valve Size | 0.5" [15] |
| 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 | A-port: as stated in chart B-port: 70% of A–AB Cv |
| Flow Characteristic | A-port equal percentage, B-port modified for constant common port flow |
| Leakage Rate | 0% for A–AB, <2.0% for B–AB |
| Pipe Connection | Internal thread NPT (female) |
| Servicing | maintenance-free |
| Flow Pattern | 3-way Mixing/Diverting |
| Controllable Flow Range | 75° |
| Cv | 1.9 |
| 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 | 3.8 GPM |
| Valve Weight | 0.59 lb [0.27 kg] |
| Compatible Belimo Actuator Families | |
|---|---|
| Non Fail-Safe Actuators | TR LRB(X) LRQB(X) NRB(X) N4 |
| Spring Actuators | TFRB(X) LF |
Documentation
Belimo B311 Technical Data SheetCCV 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 B311?
The B311 valve is rated Cv 1.9. At a 4 psi pressure drop it passes 3.8 GPM of water.
What size and pipe connection does the B311 use?
1/2 in. (0.5" [15]) with internal thread NPT (female) connections.
Does the B311 include an actuator?
No. The B311 is the valve only. Compatible Belimo actuator families: Non Fail-Safe: TR LRB(X) LRQB(X) NRB(X) N4; Spring: TFRB(X) LF.
What warranty does the B311 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 B311?
200 psi close-off pressure, with a 600 psi body pressure rating.
What fluids can the B311 control?
Chilled or hot water, up to 60% glycol, fluid temperature range 0...250°F [-18...120°C].
Specifications per Belimo B311 technical data sheet (2026-02-07); 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:
- 3-Way
- Valve Size:
- 1/2 Inch
- CV Rating:
- 1.9
- GPM:
- 3.8 @ 4 psi
- Material:
- Stainless Steel
- Actuator Type:
- Valve Only
