Samson 3767 - Page 29

EB8355-2EN 29
Mountingoncontrolvalves
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.
Fail-safeposition:Fail-closevalve
Directoperatingdirection>> Reverseoperatingdirection<>
Reference
variable
Signal
pressure
Valve Characteristic
Reference
variable
Signal
pressure
Valve Characteristic
increases increases opens N decreases increases opens I
90˚
60˚
30˚
0˚
90˚
60˚
30˚
0˚
Feeler roll
Starting point N
Starting point I
Hole to secure the cam disk
Insertclipandpresstheaps
outwards
Fail-safeposition:Fail-openvalve
Directoperatingdirection>> Reverseoperatingdirection<>
Reference
variable
Signal
pressure
Valve Characteristic
Reference
variable
Signal
pressure
Valve Characteristic
decreases decreases opens I increases decreases opens N
90˚
60˚
30˚
0˚
90˚
60˚
30˚
0˚
Feeler roll
Starting point N
Starting point I
Alignment at max. signal pressure
Fig.9: Cam disk settings for single-acting actuators