Samson Type 3766 - Page 24

24 EB 8355-1 EN
Attachment to control valve
90˚
60˚
30˚
0˚
90˚
60˚
30˚
0˚
Cam follower roll
Starting point N
Starting point I
Insert clip and press tongue out-
wards
0˚
90˚
60˚
30˚
0˚
90˚
60˚
30˚
Starting point I
Cam follower roll
Starting point N
Double-acting springless rotary actuator with reversing amplifier
Linear cam disk (equal percentage cam disk is represented by a broken and dotted line)
View from the positioner onto the actuator shaft
Valve opens counterclockwise – Starting position: valve CLOSED
Direct operating direction >> Reversible operating direction <>
Reference
variable
Signal
pressure
Valve Charact-
eristic
Reference
variable
Signal
pressure
Valve Charact-
eristic
increases A1 increases,
A2 decreases
opens N decreases A1 increases,
A2 decreases
opens I
View from the positioner onto the actuator shaft
Valve opens clockwise – Starting position: valve CLOSED
Direct operating direction >> Reversible operating direction <>
Reference
variable
Signal
pressure
Valve Charact-
eristic
Reference
variable
Signal
pressure
Valve Charact-
eristic
increases A1 increases,
A2 decreases
opens N decreases A1 increases,
A2 decreases
opens I
Fig. 10 · Setting the cam disk for double-acting actuators
Holes to secure
the cam disk