DeZURIK
3---36" PEF 100% Port Eccentric Plug Valves
April 2015
Page 19
D10453
Field Test
Stroke the valve between the fully open and fully closed positions to verify that the valve and actuator
are functioning properly. Prior to any field pressure test above the valve design pressure, contact
DeZURIK.
Test pressures above valve design pressure can cause leakage, permanent
or structural failure to the valve and personal injury.
Valve Exercising
Each valve should be operated through a full cycle and returned to its normal operating position on a
time schedule that is designed to prevent a buildup of media deposits that could render the valve
inoperable or prevent a tight shutoff.
The interval of time between exercising valves in critical applications or valves subjected to severe
operating conditions, should be shorter than valves in less critical installations. The time period for
valve exercising should be based on local experience.
Emergency Operation
Operate the valve as under normal conditions, taking care to bring the plug to the position required by
the particular emergency condition
.
Predicted Wear of Parts
Length of service for parts subject to wear is dependent on service conditions.
Troubleshooting
Symptom
Possible Cause
Corrective Action
Packing Leaks.
Packing is loose.
Adjust Packing.
(See
“Packing Adjustment”
section.)
Packing is worn.
Replace Packing.
(See
“Packing Replacement”
section.)
Valve does not close.
Object is wedged between plug
and seat.
Open the valve completely
to flush object. If this doesn’t work,
remove valve from the pipeline or drop
one section of adjacent pipe.
(See
“Removing Valve from Pipeline”
section.)
Actuator closed position is
out of adjustment.
Adjust the closed position
stop as described in the
Actuator instructions.
Valve leaks when closed
Plug is worn or damaged.
Replace plug.
(See
“Disassembly”
section.)
Rubber on plug is torn.