EB 8355-1 EN 23
Attachment to control valve
90˚
60˚
30˚
0˚
90˚
60˚
30˚
0˚
90˚
60˚
30˚
0˚
90˚
60˚
30˚
0˚
Cam follower roll
Starting point I
Starting point N
Position at max. signal pressure
Starting point I
Starting point N
Holes to secure
the cam disk
Insert clip and press
tongue outwards
Cam follower roll
Single-acting spring-loaded rotary actuator
Linear cam disk (equal percentage cam disk is represented by a broken and dotted line)
Valve opens counterclockwise
For valves that open clockwise, the cam disk must be turned over so that the cam follower roll moves
over the same disk segments as shown in the figures below, but with the cam disk turning clockwise.
Fail-safe position: Valve CLOSED without supply air
Direct operating direction >> Reversible operating direction <>
Reference
variable
Signal
pressure
Valve Charact-
eristic
Reference
variable
Signal
pressure
Valve Charact-
eristic
increases increases opens N decreases increases opens I
Fail-safe position: Valve OPEN without supply air
Direct operating direction >> Reversible operating direction <>
Reference
variable
Signal
pressure
Valve Charact-
eristic
Reference
variable
Signal
pressure
Valve Charact-
eristic
decreases decreases opens I increases decreases opens N
Fig. 9 · Setting the cam disk for single-acting rotary actuators
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