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Design and method of operation
Positioning
Actuator type
pressure
Connection
Y1
Open
Closed
Y1
Open
Closed
Y2
Y1
Closed
Open
Y1
Y2
Closed
Open
Y1
Y1
Y2
Y1
Y1
Y2
Figure 12
Pneumatic connection positioning
28
The exhaust air output E can be provided for supplying dry instrument
air to the tapping chamber and spring chamber to prevent corrosion.
Figure 12, page 28 shows the pneumatic connection variants for the
different actuator types, the positioning acting and the safety position
after power failure.
Safety position after power failure"
electrical
Closed
Open
Open
Closed
up
Down
down
up
Up
down
up
Up
down
up
Down
down
pneumatic
In part--turn actuators the
direction of rotation
counterclockwise looking
onto the actuating shaft of
Closed
the valve is usually defined
"
as
Open
Open
Last position
(before power
failure)
Down
Up
Last position
(before power
failure)
SIPART PS2 PA Manual
"
.
Open
Closed
up
down
A5E00127926--05
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