B2050VS-02+LF24 US 1/2 in. 2-Way Ball Valve with Spring Return Actuator, 24 VAC/DC, On/Off
Modified equal percentage ball valve for chilled or hot water, up to 60% glycol, or steam up to 35 psi inlet, with on/off control. Fail position (open or closed) is set at the factory; state it when ordering.
Key Features
- Cv: 2
- Close-off: 600 psi
- Control: on/off
- Torque: 35 lb-in
Product Specifications
| Manufacturer | Belimo |
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| Model | B2050VS02LF24US (B2050VS-02+LF24 US) |
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| Valve | B2050VS-02 |
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| Valve size | 0.5" (15) |
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| Fluid | chilled or hot water, up to 60% glycol, steam |
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| Fluid Temp Range (water) | -22 to 280 deg F (-30 to 138 deg C) |
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| Body Pressure Rating | 600 psig WOG |
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| Close-off pressure | 600 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) | 35 psi |
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| Flow Pattern | 2-way |
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| Controllable flow range | 90 deg rotation |
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| Cv | 2 |
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| Maximum Inlet Pressure (Steam) | 35 psi (241 kPa) |
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| Valve body | Bronze B584-C84400 |
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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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| Retainer | B16 Brass |
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| Ball | 316 stainless steel |
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| Suitable actuators, non-spring return | LMB(X) GRCB(X) GRB(X) |
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| Suitable actuators, spring return | LF |
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Actuator: LF24 US
| 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 | 5W |
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| Power consumption in rest position | 2.5 W |
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| Transformer sizing | 7 VA |
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| Electrical Connection | 18 AWG appliance cable, 1 m, with 1/2" NPT conduit connector |
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| Overload Protection | electronic throughout 0 to 95 deg rotation |
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| Electrical Protection | actuators are double insulated |
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| Torque | 35 lb-in (4 Nm) |
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| Direction of motion fail-safe | reversible with cw/ccw mounting |
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| Angle of rotation | Max. 95 deg |
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| Running time (motor) | 75 s / 90 deg |
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| Running time fail-safe | <25 s @ -20 to 50 deg C, <60 s @ -30 deg C |
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| Sound power level, motor | 50 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 UL 873 and CAN/CSA C22.2 No. 24-93 |
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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 | 3.8 lb (1.7 kg) |
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| Housing material | galvanized steel |
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| Application | For On/Off, fail-safe control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications. Control is On/Off from an auxiliary contact or a manual switch. The actuator is mounted directly to a damper shaft from 3/8” up to 1/2” in diameter by means of its universal clamp, 1/2” shaft centered at delivery. For shafts up to 3/4” use K6-1 accessory. A crank arm and several mounting brackets are available for applications where the actuator cannot be direct coupled to the damper shaft. |
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| Operation | The LF series actuators provide true spring return operation for reliable fail-safe application and positive close off on air tight dampers. The spring return system provides consistent torque to the damper with, and without, power applied to the actuator. The LF series provides 95 deg of rotation and is provided with a graduated position indicator showing 0 to 95 deg. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches. Power consumption is reduced in holding mode. The actuator is double insulated so an electrical ground connection is not necessary. |
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| Specification | On/Off spring return damper actuators shall be direct coupled type which require no crank arm and linkage and be capable of direct mounting to a shaft up to a 3/4" diameter and center on a 1/2" shaft (default). Actuator shall deliver a minimum output torque of 35 lb-ins. The actuator must be designed so that they may be used for either clockwise or counter clockwise failsafe operation. Actuators shall be protected from overload at all angles of rotation. If required, one SPDT auxiliary switch shall be provided with one switch having the capability of being adjustable. Actuators with auxiliary switch must be constructed to meet the requirement for Double Insulation so an electrical ground connection is not required to meet agency listings. Actuators shall be cULus listed, have a 5 year warranty, and be manufactured under ISO 9001 International Quality Control Standards. Actuators shall be as manufactured by Belimo. |
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