Cameron Pow-R-Seal WKM 109 Installatie-, Bedienings- en Onderhoudshandleiding - Pagina 16

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TROUBLESHOOTING

Trouble
Leakage is occurring around the stem, yoke tube
drain, or yoke tube to bonnet joint
Leakage is occurring around the stem, yoke tube
drain, or yoke tube to bonnet joint.
The Grease fitting or bleed plug is leaking.
The valve is leaking around bonnet to
body joint.
A restriction is present in the valve bore.
The valve will not open
or close.
The valve is hard to
operate.
Installation, Operation and Maintenance Manual
Probable Cause
The stem seal is leaking due to a contaminated
stem.
The stem seal is leaking due to dammage or
abnormal wear.
The stem seal is leaking due to damage or abnor-
mal wear.
The safety cap or bleed plug screw is loose.
The bonnet seal is leaking.
The gate is not properly aligned with the seats.
The valve is pressure locked
.
2
The lubrication is not sufficient.
Ice is present in the yoke tube, handwheel unit, or
operator.
Line bind is present. (Pipeline bending
moments distorting the valve body).
16
E N G I N E E R E D & P R O C E S S V A L V E S
Remedy
Cycle the valve serveral times.
ALL VALVES EXCEPT THOSE WITH
PACKING GLANDS (OPG/OS&Y)
Inject plastic packing as follows:
Remove the packing fitting screw and install a
packing injection gun
loaded with the proper
1
plastic injectable. Refer to the
"Recommeded Lubricants and Sealants" (chart).
Using the packing gun, pump plastic to energize
the packing set. 4000-5000 psig (275-345 barg) is
usually sufficient. DO NOT EXCEED10,000 psig (690
barg)
WARNING: THE INJECTION PRESSURE IS
TWICE THE HYDRAULIC GAUGE PRESSURE.
Hold for at least 3 minutes. Re-pressurize, as
needed.
Remove the packing gun.
Lubricate the packing fitting screw thread with a
good grade of bearing grease. Thread it into the
fitting.Tighten securely but do not exceed 7 ft-lbf
of torque.
(9.5 N-M).
VALVES WITH OUTSIDE PACKING
GLANDS (OPG)
Tighten the gland bolts in a alternating crossing
pattern to stop the leak. Do not over tighten.
Tighten the safety cap or bleed plug screw.
Insure that the bonnet nuts are tightened prop-
erly. Call CAMERON VALVES &
MEASUREMENT representative if
leakage persists.
HANDWHEEL OR BEVEL GEAR OPERATED
VALVES: Open the valve fully by turning the
handwheel counter-clockwise.
Tighten securely.
DO NOT BACK OFF THE HANDWHEEL.
MOTOR OPERATED VALVES: Make sure the
operator limit switches are set correctly.
Vent the body pressure by using a pressure
releasing tool on one of the body vent fittings.
Lubricate the bearings, operator, and/or seats
per the Routine Maintenance Section. Lubricate
the operator per the manufacturer's instructions.
Apply heat to melt ice.
Relieve the bind or moment on the valve.
(continued next page)
02/2011 / IOM-WKM-GATE-PRS-01
OUTSIDE