October 2019
Installation, Operation and Maintenance Manual
MAN-02-04-97-0713-EN Rev. 1
98
Section 12: Troubleshooting
Troubleshooting
12.8 Valve Operation requires Excessive Torque
• Clean, lubricate and check the valve stem.
• If the valve packing is too tight, loosen the gland bolt nuts.
• Coupling type “A”: if a tight t between bush and stem is evident, increase the
thread clearance on the drive coupling.
• Coupling types “B1”, “B2”, “B3” and “B4”: ensure that there are no axial forces on
the valve stem by leaving adequate axial clearance between the stem and the drive
bush. Also check that all transmission shafts, universal joints, or bulkhead passages
are sufciently lubricated and check that the transmission shafts are not bent.
• Check that the internal valve trim or the reducer gears are well lubricated and
not damaged.
• Check the alphanumeric display for diagnostic messages, and proceed with
the suitable corrective actions as described in this Section, Section 12.11,
Diagnostic messages.
Figure 86
Figure 87
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