TOV
Installation, Operation and Maintenance Manual
13
WKM-TOV-IOM
Troubleshooting guide
Symptom
Possible Cause
Resolution
Valve does not seal
properly
1. Valve not fully closed.
1. Close valve.
2. Foreign matter is present between seat
and disc.
2. Operate several times to wipe clean.
3. Operator stops are not set properly.
3. Adjust stops to proper setting.
4. The seat and/ or disc is worn or
damaged.
4. Replace worn parts.
5. Seat retainer screws are not tight.
6. Tighten seat retainer screws as per
torquing method.
Valve is leaking around
the stem
1. Packing retainer flange nuts too loose.
1. Tighten packing nuts.
2. Packing damaged.
2. Replace packing -
See “Packing
maintenance”.
Bottom cap gasket
leaking
1. Bottom cap bolting loose.
1. Tighten bottom cap bolting.
2. Spiral wound gasket damage.
2. Replace spiral wound gasket
– See
“Bottom cap gasket maintenance”.
Valve is hard to rotate
1. Shaft packing too tight.
1. Tighten packing only sufficiently to stop
leaks.
2. Operator failed/ not installed properly.
2. Replace or repair.
3. Build up of solids or roughness on edge
of disc.
3. Operate several times to wipe clean or
disassemble valve and clean disc edge.
4. Shaft key has sheared.
4. Determine cause of shearing and
correctly replace shaft key.
5. Fluid solidification between bearings
and shaft.
5. Flush bearings.
Jerky operation
1. Packing is too tight.
1. Loosen packing nuts, cycle valve,
retighten.
2. Air supply inadequate for the actuator.
2. Increase air supply pressure and/or
volume.
3. Actuator/shaft adapter misaligned.
3. Remove actuator mounting and realign.
The valve will not open
1. Disc hits on side of pipe.
1. Check for proper pipe clearance.
Routine maintenance
Caution:
The line shall be depressurized before starting any
maintenance. Failure to do so may cause serious
personal injury and or equipment damage.
Because of the simple design and operation, WKM
®
Triple Offset Valves require virtually no maintenance.
Its non-lubricated construction provides reliable leak free
performance without routine servicing.
The only preventative maintenance recommended for
the valve is to periodically inspect for leaks around the
shaft packing. Should a leak appear, the packing can be
adjusted by tightening the packing retainer nuts slightly.
Avoid excessive tightening which may result in excessive
valve torque or premature packing wear.(Refer Chart B
for recommended retainer torque values)
