8VH For the operation of Siemens two-port and three-port valves, types VVF... and VXF... with a 20 mm or 40 mm stroke. • Field of application in accordance with IEC 721-3-3 Class 3K5 • Ambient temperatures: − 1 5 ... + 55 °C • Temperature of medium in the connected valve: − 25 ... + 220 °C > 220 ... 350 °C: use special extension on valve < 0 °C: type ASZ6.5 stem heater required
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• • • • • • • • •
Electro-hydraulic actuators; no maintenance required Pump, pressure cylinder and piston to open valve Return spring and bypass valve to close valve Choice of actuators with or without spring-return function to DIN 32730 Manual adjuster and position indication Mounting spaces for dual auxiliary switches and a potentiometer Stem heater can be fitted if required Mechanical stroke inverter can be installed if required (SKB... only) Type SK...82...U actuators are UL-approved
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Type
Operating voltage
Control (Control signal)
6.%
AC 230 V
3-position
6.% 6.%
AC 24 V
6.%
6.& ZLWKDPPVWURNH
Yes
10 s
No
--
Yes
10 s
No
--
Yes
10 s
Type
Operating voltage
Control (Control signal)
6.&
AC 230 V
3-position
AC 24 V
6.&
--
6.%8
6.&
$FFHVVRULHV
No
6.%8
6.&
Spring-return Function Time
Spring-return Function Time No
--
Yes
18 s
No
--
Yes
18 s
6.&8
No
--
6.&8
Yes
18 s
Running time Opening Closing 120 s
120 s
Running time Opening Closing 120 s
120 s
UL-approved versions Type
Description
$6&
Dual auxiliary switches
$6=
Potentiometer 1000 Ω
$6=
Potentiometer 135 Ω
$6=
Potentiometer 200 Ω
$6=
Stem heater AC 24 V
$6.
Mechanical stroke inverter (SKB... only)
Only one potentiometer per actuator may be installed
2UGHULQJ When ordering please specify the quantity, product name and type code. ([DPSOH DFWXDWRUW\SH6.& and SRWHQWLRPHWHUΩW\SH$6= Delivery
The actuator, valve and accessories are supplied in separate packaging and not assembled prior to delivery.
2/10 Siemens Building Technologies HVAC Products
Electro-hydraulic actuators for valves
CM1N4564E 09.2002
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The actuators can be driven by all control systems which have an AC 24 V SELV/PELV supply (SK...82…) or AC 230 V supply (SK...32…) and which operate with 3-position signals.
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The actuators are suitable for operation of the following Siemens two-port and three-port valves with a 20 mm or 40 mm stroke: Valve
For admissible differential pressures ∆pmax and closing pressures ∆ps, refer to the relevant valve data sheets.
Note
Third-party valves with strokes between 6 and 20 mm (SKB...) and 12 ... 40 mm (SKC...) can be motorized, provided they are «closed with the de-energized» fail-safe mechanism and provided that the necessary mechanical coupling is available. The Y1 signal must be routed via an additional freely-adjustable end switch (ASC9.3) to limit the stroke. We recommend that you contact local Siemens office for the necessary information.
3/10 Siemens Building Technologies HVAC Products
Electro-hydraulic actuators for valves
CM1N4564E 09.2002
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Valve closed
Manual adjuster
Pressure cylinder
Piston
Reservoir
Pressure chamber
Pump
Return spring
Bypass valve
Coupling
Valve stem
Inner valve
Position indicator (0 to 1)
Valve open
• 9ROWDJHDW 100 mm Minimum clearance from ceiling or wall for mounting, ▲▲ = > 200 mm connection, operation, maintenance etc.
