Samson 3767 Mounting And Operating Instructions page 30

Mounting on control valves
Double-acting, springless rotary actuator with reversing amplifier
Linear cam disk (equal percentage cam disk is represented by a broken and dotted line)
Control valve opens counterclockwise – Based on a closed valve
Direct operating direction >>
Reference
Signal pressure
variable
A1 increases, A2
increases
decreases
Control valve opens counterclockwise – Based on a closed valve
Direct operating direction >>
Reference
Signal pressure
variable
A1 increases, A2
increases
decreases
Feeler roll
Starting point N
Fig. 10: Cam disk settings for double-acting actuators
30
View from the positioner onto the actuator shaft
Charac-
Valve
teristic
opens
Feeler roll
Starting point N
Hole to secure the cam disk
Insert clip and press the flaps
outwards
0˚
View from the positioner onto the actuator shaft
Charac-
Valve
teristic
opens
0˚
Reverse operating direction <>
Reference
variable
N decreases
Reverse operating direction <>
Reference
variable
N decreases
Starting point I
Signal pressure Valve
A1 increases, A2
opens
decreases
Starting point I
0˚
Signal pressure Valve
A1 increases, A2
opens
decreases
0˚
EB 8355-2 EN
Charac-
teristic
I
Charac-
teristic
I