DeZurik 250 Gebruiksaanwijzing - Pagina 12
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DeZURIK MODELS 145 AND 250 DIAPHRAGM ACTUATOR ISO MOUNTING
Changing Actuator Mounting Position on Valve
Before changing the actuator mounting position, check to assure that clearance is available for the
proposed actuator location. The actuator may be mounted on the valve in either of two positions-
standard or 180º-both perpendicular with the pipeline, as shown on the installation drawing. To change
the position, follow steps in the Removing Actuator from Valve section and the Replacing Actuator on
Valve section.
Troubleshooting
Condition
Actuator will not operate valve.
Actuator closes to wrong
position.
Actuator opens to wrong
position.
Actuator will not fully operate
valve.
Spring operates valve in wrong
direction.
Actuator operation is not
smooth; movement is "jerky".
September 2015
Possible Cause
Rubber diaphragm is ruptured.
Closed position stop is set
incorrectly.
Open position stop is set
incorrectly.
Actuator air pressure is low.
Actuator is sized incorrectly.
Pipeline obstruction in valve is
preventing closure.
Spring-to-close should be
spring-to-open, or vice versa
Stem bearings are worn.
Stem is worn.
Page 12
Corrective Action
Replace diaphragm. See
Diaphragm Replacement section.
Adjust closed position stop. See
Open and Closed Position Stops
section.
Adjust open position stop. See
Open and Closed Position Stops
section.
Increase air pressure. Do not
exceed spring rating.
Use spring with increased rating,
or use larger actuator.
Remove obstruction.
Reverse the action. See
Reversing Actuator Action section.
Replace stem bearings (B43) and
(B38). See Actuator Disassembly
and Actuator Assembly sections.
Replace stem (B3). See Actuator
Disassembly and Actuator
Assembly sections.
D10368