B278+AFRB24 3 in. 2-Way CCV with Spring Return Actuator, 24 VAC/DC, On/Off
Equal percentage ball valve for chilled or hot water, up to 60% glycol, with on/off control. Fail position (open or closed) is set at the factory; state it when ordering.
Key Features
- Cv: 130
- Close-off: 100 psi
- Control: on/off
- Running time: 75 s
Product Specifications
| Manufacturer | Belimo |
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| Model | B278AFRB24 (B278+AFRB24) |
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| Valve | B278 |
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| Valve size | 3" (80) |
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| Fluid | chilled or hot water, up to 60% glycol |
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| Fluid Temp Range (water) | 0 to 212 deg F (-18 to 100 deg C) |
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| Body Pressure Rating | 400 psi |
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| Close-off pressure | 100 psi |
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| Flow characteristic | equal percentage |
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| Pipe connection type | Internal thread NPT (female) |
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| Servicing | maintenance-free |
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| Flow Pattern | 2-way |
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| Leakage rate | 0% for A – AB |
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| Controllable flow range | 75 deg |
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| Cv | 130 |
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| Valve body | Nickel-plated brass body |
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| Stem | stainless steel |
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| Stem seal | EPDM (lubricated) |
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| Seat | PTFE |
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| Characterized disc | TEFZEL |
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| O-ring | EPDM (lubricated) |
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| Ball | stainless steel |
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| Suitable actuators, non-spring return | ARB(X) |
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| Suitable actuators, spring return | AFRB(X) |
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Actuator: AFRB24
| Nominal voltage | AC/DC 24 V |
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| Nominal voltage frequency | 50/60 Hz |
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| Nominal voltage range | AC 19.2 to 28.8 V / DC 21.6 to 28.8 V |
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| Power consumption in operation | 5.5 W |
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| Power consumption in rest position | 1.5 W |
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| Transformer sizing | 7.5 VA |
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| Overload Protection | electronic throughout 0 to 95 deg rotation |
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| Direction of motion motor | selectable by ccw/cw mounting |
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| Direction of motion fail-safe | reversible with cw/ccw mounting |
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| Manual override | 5 mm hex crank (3/16" Allen), supplied |
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| Angle of rotation | 90 deg |
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| Running time (motor) | 75 s / 90 deg |
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| Running time fail-safe | <20 s |
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| Sound power level motor | 45 dB(A) |
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| Sound power level, fail-safe | 62 dB(A) |
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| Position indication | Mechanical |
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| Power source UL | Class 2 Supply |
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| Degree of protection NEMA/UL | NEMA 2 |
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| Housing | UL Enclosure Type 2 |
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| Agency Listing | cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-1:02 CE acc. to 2014/30/EU and 2014/35/EU |
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| Quality Standard | ISO 9001 |
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| UL 2043 Compliant | Suitable for use in air plenums per Section 300.22(C) of the NEC and Section 602 of the IMC |
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| Ambient humidity | Max. 95% RH, non-condensing |
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| Ambient temperature | -22 to 122 deg F (-30 to 50 deg C) |
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| Storage temperature | -40 to 176 deg F (-40 to 80 deg C) |
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| Servicing | maintenance-free |
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| Weight | 5.3 lb (2.4 kg) |
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| Housing material | Galvanized steel and plastic housing |
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| Innovative motorization | The actuator uses the powerful Belimo M600 microchip in combination with the INFORM method. It provides the full starting torque from a standstill with high precision (sensorless INFORM-Drive by Prof. Schrödl). |
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