DeZURIK
Willamette AWWA Metal Seated Ball Valve
January 2022
Page 14
D12001
Troubleshooting
Condition
Possible Cause
Corrective Action
Shaft seal leaks.
O-ring is worn.
Replace o-ring.
Valve leaks excessively from
one side of the ball to the other.
Foreign matter caught between
seats
Fully open valve to remove
object.
Closed position stop is set
incorrectly.
Adjust closed position stop.
Valve body is distorted.
Remove stress to valve body.
Loss of media’s seating
pressure.
Apply media pressure.
Seat is worn or damaged.
Repair seat or replace valve.
Valve leaks at flange joint.
Loose flange bolting.
Tighten flange bolting.
Blown flange gasket.
Replace flange gasket.
Misalignment or damage to field
piping and supports.
Adjust misalignment or repair
piping or supports.
Damaged flange face/s or
improper flange connections.
Repair flange, replace valve
body or adjust flange
connections.
Valve does not fully close.
Object is wedged between seat
and ball.
Fully open valve to remove
object.
Closed position stop is not set
correctly.
Adjust closed position stop.
Valve does not fully open.
Open position stop is not
adjusted correctly.
Adjust open position stop.
Valve fails to operate from open
to close position or from closed
to open.
Object is wedged between seat
and ball.
Fully open or close valve to
remove object.
Torque unit low on lubricant.
Add lubricant.
Torque unit component failure.
Repair or replace torque unit.
Actuator component failure.
Repair or replace actuator.