Product Overview

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Siemens Building Technologies Electro-hydraulic actuators for valves CM1N4564E
HVAC Products 13.02.2009
Third-party valves with strokes between 6...20 mm can be motorized, provided
they are «closed with the de-energized» fail-safe mechanism and provided that the
necessary mechanical coupling is available. For SKB32.. and SKB82.. the Y1 signal
must be routed via an additional freely-adjustable end switch (ASC9.3) to limit the
stroke.
We recommend that you contact your local Siemens office for the necessary
information.
Technology
4567Z01
1
3
4
2
5
9
6
7
8
10
11
12
4567Z02
1 Manual adjuster
2 Pressure cylinder
3 Suction chamber
4 Return spring
5 Solenoid valve
6 Hydraulic pump
7 Piston
8 Pressure chamber
9 Position indicator (0 to 1)
10 Coupling
11 Valve stem
12 Plug
Valve closed Valve open
The hydraulic pump (6) forces oil from the suction chamber (3) to the pressure chamber
(8) and thereby moving the pressure cylinder (2) downwards. The valve stem (11)
retracts and the valve opens. Simultaneously the return spring (4) is compressed.
Activating the solenoid valve (5) allows the oil in the pressure chamber to flow back into
the suction chamber. The compressed return spring moves the pressure cylinder
upwards. The valve stem extends and the valve closes
Turning the manual adjuster (1) clockwise moves the pressure cylinder downwards and
opens the valve. Simultaneously the return spring is compressed.
In the manual operation mode the control signals Y and Z can further open the valve
but cannot move to the «0%» stroke position of the valve. To retain the manually set
position, switch off the power supply or disconnect the control signals Y and Z. The red
indicator marked «MAN» is visible.
When setting the controller for a longer time period to manual operation, we
recommend adjusting the actuator with the manual adjuster to the desired position. This
guarantees that the actuator remains in this position for that time period. Attention: Do
not forget to switch back to automatic operation after the controller is set back to
automatic control.
Turn the manual adjuster counterclockwise to the end stop. The pressure cylinder
moves upward to the «0%» stroke position of the valve. The red indicator marked
«MAN» is no longer visible.
The actuator can manually be adjusted to a stroke position > 0 % allowing its use in
applications requiring constantly a minimal volumetric flow.
Note
Principle of
electro-hydraulic
actuators
Opening the valve
Closing the valve
Manual operation mode
Note: Controller in
manual operation
A
utomatic mode
Minimal volumetric flow