B249VSS+PKRXUP-MFT-T 2 in. 2-Way Ball Valve with Electronic Fail-Safe Actuator, 24-240 VAC/DC, MFT
Modified equal percentage ball valve for chilled or hot water, up to 60% glycol, or steam up to 50 psi inlet, with multi-function (MFT) control. MFT ships set for 2-10 VDC; order a programming code, or reprogram with Belimo Assistant 2 or ZTH US, for other signals. Fail position (open or closed) is set at the factory; state it when ordering.
Key Features
- Cv: 108
- Close-off: 1000 psi
- Control: MFT (programmable)
- Aux switch: 2x SPDT
Product Specifications
| Manufacturer | Belimo |
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| Model | B249VSSPKRXUPMFTT (B249VSS+PKRXUP-MFT-T) |
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| Valve | B249VSS |
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| Valve size | 2" (50) |
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| Fluid | chilled or hot water, up to 60% glycol, steam |
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| Fluid Temp Range (water) | -22 to 298 deg F (-30 to 148 deg C) |
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| Body Pressure Rating | 1500 psig WOG |
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| Close-off pressure | 1000 psi |
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| Flow characteristic | modified equal percentage |
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| Leakage rate | ANSI Class VI |
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| Pipe connection | Internal thread NPT (female) |
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| Max Differential Pressure (Steam) | 50 psi |
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| Flow Pattern | 2-way |
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| Controllable flow range | 90 deg rotation, A – AB open ccw, B – AB open cw |
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| Cv | 108 |
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| Maximum Inlet Pressure (Steam) | 50 psi |
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| Valve body | Stainless steel A351-CF8M 316 |
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| Housing seal | PTFE |
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| Stem | 316 stainless steel |
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| Stem seal | RPTFE |
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| Seat | RPTFE |
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| Lock nut | stainless steel |
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| Ball | 316 stainless steel |
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| Suitable actuators, non-spring return | GMB(X) PRB(X) |
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| Suitable actuators, spring return | AF |
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| Electronic fail-safe | GKB(X) PKRB(X) |
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| Application | These threaded valves are designed to provide modulating or two position control of hot or chilled water and saturated steam systems under 50 psi. Typical applications include reheat coils, VAV terminal control, unit ventilators, and air handlers, especially in areas which have minimum profile requirements. Up to 50 psi steam 1/2" - 2000 PSIG WOG, Cold Non-Shock Federal Specification: WW-V-35C, Type II Composition: SS Style: 3 |
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Actuator: PKRXUP-MFT-T
| Nominal voltage | AC 24 to 240 V / DC 24 to 125 V |
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| Nominal voltage frequency | 50/60 Hz |
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| Nominal voltage range | AC 19.2 to 264 V / DC 19.2 to 137.5 V |
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| Power consumption in operation | 52 W |
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| Power consumption in rest position | 9W |
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| Transformer sizing | with 24 V 54 VA / with 240 V 68 VA |
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| Auxiliary switch | 2x SPDT, 1 mA...3 A (0.5 A inductive), DC 5 V...AC 250 V (II, reinforced insulation), 1x 10 deg / 1x 0 to 90 deg (default setting 85 deg) |
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| Switching capacity auxiliary switch | 1 mA...3 A (0.5 A inductive), DC 5 V...AC 250 V (II, reinforced insulation) |
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| Overload Protection | electronic thoughout 0 to 90 deg rotation |
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| Communicative control | BACnet MS/TP Modbus RTU MP-Bus |
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| Operating range Y | 2 to 10 V |
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| Operating range Y note | 4 to 20 mA |
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| Input impedance | 100 kΩ for 2 to 10 V (0.1 mA), 500 Ω for 4 to 20 mA, 1500 Ω for On/Off |
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| Operating range Y variable | Start point 0.5 to 30 V End point 2.5 to 32 V |
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| Operating modes optional | variable (VDC, on/off, floating point) |
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| Position feedback U | 2 to 10 V |
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| Position feedback U note | Max. 0.5 mA |
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| Position feedback U variable | VDC variable |
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| Setting fail-safe position | 0 to 100%, adjustable with Belimo Assistant App (default setting 0%) |
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| Bridging time (PF) | 2s |
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| Bridging time (PF) variable | 0 to 10 s |
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| Pre-charging time | 5 to 20 s |
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| Direction of motion motor | reversible with app |
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| Direction of motion fail-safe | reversible with app |
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| Manual override | 7 mm hex crank, supplied |
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| Angle of rotation | 90 deg |
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| Running time (motor) | 35 s / 90 deg |
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| Running time motor variable | 30 to 120 s |
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| Running time fail-safe | <30 s |
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| Sound power level motor | 68 dB(A) |
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| Sound power level, fail-safe | 62 dB(A) |
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| Position indication | top mounted domed indicator |
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| Power source UL | Class 2 Supply |
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| Degree of protection NEMA/UL | NEMA 4X |
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| Housing | UL Enclosure Type 4X |
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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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| Ambient humidity | Max. 100% RH |
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| Ambient temperature | -22 to 122 deg F (-30 to 50 deg C) |
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| Servicing | maintenance-free |
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| Weight | 15 lb (6.6 kg) |
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| Housing material | Die cast aluminium and plastic casing |
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