Siemens Building Technologies SKB/SKC Valve Actuator Data Sheet

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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 sufx 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 sufx 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 Retrot Kit

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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.

Prex 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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