Samson 3767 Mounting And Operating Instructions page 29

Single-acting rotary actuator with spring-return mechanism
Linear cam disk (equal percentage cam disk is represented by a broken and dotted line)
Control valve opens counterclockwise
For valves that open clockwise, the cam disk must be turned over so that lever with feeler roll moves
over the same disk segments as shown in the images below, but with the cam disk turning clockwise.
Direct operating direction >>
Reference Signal
variable pressure
increases increases
Direct operating direction >>
Reference Signal
variable pressure
decreases decreases
Fig. 9: Cam disk settings for single-acting actuators
EB 8355-2 EN
Fail-safe position: Fail-close valve
Valve Characteristic
opens N
Feeler roll
Starting point N
Hole to secure the cam disk
Insert clip and press the flaps
outwards
0˚
Fail-safe position: Fail-open valve
Valve Characteristic
opens I
Feeler roll
Starting point I
0˚
Alignment at max. signal pressure
Mounting on control valves
Reverse operating direction <>
Reference Signal
variable pressure
decreases increases
Reverse operating direction <>
Reference Signal
variable pressure
increases decreases
Valve Characteristic
opens I
Starting point I
0˚
Valve Characteristic
opens N
Starting point N
0˚
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