DeZURIK
November 2020
Page 19
D10389
Troubleshooting
Condition
Possible Cause
Corrective Action
Actuator closes to wrong position
Closed position stop is set
incorrectly
Adjust closed position stop.
See
Position Stops
section.
Actuator opens to wrong position
Open position stop is set
incorrectly
Adjust open position stop.
See
Position Stops
section.
Actuator will not fully operate
valve
Cylinder pressure is low
Increase cylinder pressure. Do not
exceed 100 psi
Actuator is sized
incorrectly
Use larger actuator
Piston seal in cylinder is
leaking
Replace piston seal(s)
Pipeline obstruction is
preventing closure
Remove obstruction
Lockable Model is locked
Place in unlocked condition.
See
Lockable Model
section
Valve fails in wrong direction with
spring-return actuator
Actuator is assembled
incorrectly
Exchange locations of spring-return
and double-acting cylinders
