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Contents are subject to change without notice.
SKW/ SKF-2015-09-ENG
6.6
Troubleshooting
Table 12.Troubleshooting.
Problem
Possible reason
Action
Leakage from bottom
cover plate
Loose flushing pipeline connections or bottom
cover plate
Check the flushing connection and bottom cover
plate tightness
Damaged ring sleeve and/or gate
Check ring sleeves and gate and change as needed
Leakage from flange
connection
Flange connection is loose
Tighten the flange connection bolts to correct torque
Flange connection bolts are too long
Measure the bolts and change as needed
Pipeline flanges and valve are misaligned
Check that the flanges are parallel and concentric to
valve
Leakage from the
secondary seal
Tower mounting bolts loose
Tighten tower mounting bolts
Secondary seal worn out
Replace secondary seal
Valve does not
open/close or valve
is not tight
Fault in actuator, limit switch or control
system
Check and fix actuator operation
Clogged up with solids
Clean gate and body cavity. Check or install flushing.
Damaged gate, ring sleeve or secondary seal
Check and change damaged parts
Valve does not
open/close smoothly
Insufficient lubrication
Lubricate valve and increase scheduled lubrication.
Lubricate the actuator.
Opening/closing
force too high*
Insufficient lubrication
Lubricate valve and increase scheduled lubrication.
Lubricate the actuator.
Flange or tower mounting bolts too tight
Check and loosen bolts
Damaged gate, ring sleeve or secondary seal
Check and change damaged parts
Ring sleeve lifetime
is short
Insufficient flushing
Check flushing flow and pressure or install flushing
Insufficient lubrication
Increase scheduled lubrication
Unsuitable ring sleeve material for process
Check with Flowrox
Damaged gate
Check gate for scrapes and bending and change if
damaged
*
Manually operated valves are actuated with normal hand force.
