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Siemens
Product Guard
Warranty
SKB/SKC Valve Actuator
24 Vac, Proportional Control
0 to 10 Vdc or 4 to 20 mA
Spring Return
Flowrite Globe
Flowrite SKB/SKC Valve Actuator.
Description
Designed for use with Flowrite and other standard valves
with a 3/4-inch and 1-1/2-inch (20 and 40 mm) strokes,
the Flowrite SKB/SKC Electronic Valve Actuator receives
a 0 to 10 Vdc or 4 to 20 mA control signal to proportionally
control the valve. The actuators are available with
standard or advanced functionality.
Features
Standard Models
Part nos. with U sufx have these standard features:
• Direct-coupled installation requires no special tools
or adjustments
• Visual and electronic stroke indication
• Die-cast aluminum housing
• Highest close-off in the industry
• 3/4-inch stroke (SKB)
• 1-1/2-inch stroke (SKC)
• 1000 lb. (4400 N) nominal force
• Manual override
• Spring return to fail safe position
• Maintenance-free
Applications
The Flowrite SKB/SKC Electronic Valve Actuator
with proportional control is designed to be used with
Flowrite and other standard valves with a 3/4-inch and
1-1/2-inch (20 and 40 mm) strokes in liquid and steam
service applications.
A-191
Valves
Advanced Feature Models
Part nos. with UA sufx have standard features, plus these
advanced features:
• Adjustable start and span
• Stroke limit control
• Selectable operation direction (direct or reverse acting)
• Choice of linear or equal percentage ow characteristics
• Designed to be used with other manufacturer’s valves
with the appropriate Universal Valve Retrot Kit
Siemens
Product Guard
PLUS 3 Warranty
www.usa.siemens.com/hvac
Page 2
SKB/SKC Specifications
A-192
Valves
Nominal Stroke
SKB62U/UA .........................................................................3/4" (20 mm)
SKC62U/UA......................................................................1-1/2" (40 mm)
Operating Voltage ................................................................ 24 Vac ±20%
Frequency ................................................................................... 50/60 Hz
Power Consumption
SKB62U/UA ........................................................................ 17 VA (12 W)
SKC62U/UA........................................................................ 28 VA (20 W)
Control Signals
Control Input (Y)
Signal.............................................................0 to 10 Vdc or 4-20 mA
Max Impedance
0 to 10 Vdc ....................................................................... 100K Ohm
4 to 20 mA ...........................................................................250 Ohm
Control Input (Z)
Resistance ................................................................0 to 1000 Ohms
Voltage............................................................................... 0 to 1.6 V
SKB/SKC Product Ordering
Actuator
Description Part No.
3/4" Stroke
Standard Features SKB62U 291
Advanced Features SKB62UA —
1-1/2" Stroke
Standard Features SKC62U 294
Advanced Features SKC62UA —
Ordering Note:
The SKB/CUA can be used with other manufacturer’s valves with
the appropriate Universal Valve Linkage Kit.
Prex Code
Feedback Output (U)
Signal........................................................ 0 to 10 Vdc or 4 to 20 mA
Local Impedance
0 to 10 Vdc ..................................................................... >500K Ohm
4 to 20 mA .........................................................................<500 Ohm
Run Time with Control Operation (full stroke)
Pushing ................................................................................120 sec.
Pulling with Spring
SKB62U ..................................................................................10 sec.
SKC62U..................................................................................20 sec.
Conduit Opening ....................................................................1/2" NPSM
Nominal Force
NC and 3-way Upper
Stroke .......................................................................................... 0%
Force ......................................................................640 lbs. (2800 N)
NO and 3-way By Pass
Stroke ...................................................................................... 100%
Force ....................................................................1000 lbs. (4400 N)
Agency Approvals ........... UL873, cUL, CSA C22.2 No. 24-93, CE N474
Enclosure ............................................................. NEMA 1 (Interior Only)
Operating
Ambient Temperature ...................................... 5 to 130°F (-15 to 55°C)
Media Temperature ..................................... 14 to 428°F (-10 to 220°C)
Mounting Location .............................................. NEMA 1 (Interior Only)
Dimensions
Dimensions shown in inches (mm).
1
Height of Actuator H
14-3/4" (375 mm) 22-3/4" (578 mm) 7" (178 mm) Width x 8-15/16" (226 mm) Depth 25" (635 mm)
Table Note:
Service height and width are the recommended dimensions to allow access to the product.
Service Height H Width/Diameter of Actuator W
Accessories & Service Kits
1
Service Width W
A-257
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