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Contents are subject to change without notice.
SKW/ SKF-2015-09-ENG
6.2
Changing the secondary seal
Follow these instructions if you are to change the secondary seal while the valve is installed
to a pipeline. The actuator, tower, and gate are removed as one package to get more work
space. Refer to
Changing the ring sleeves
or
Valve dismantling
if further service is required as
well.
Part numbers refer to
Mechanical structure
.
Crush hazard. Keep your hands and feet clear of
moving parts.
1.
Depressurize and drain the pipeline.
2.
Stroke the valve to fully OPEN position and put the locking pins (13) on place.
3.
Disconnect automatic (electric, pneumatic or hydraulic) actuator from power supply to
prevent injuries.
4.
Remove the bolts (5) that attach the tower (3) to the body (1). Lift the actuator,
tower (3) and gate (2) off as one package. The secondary seal (7) might come up with
the gate (2).
5.
Remove the secondary seal (7).
6.
Clean the space for the secondary seal (7).
7.
Apply recommended silicon lubricant to any inner contours and outside of the new
secondary seal (7) and push it in the sealing slot. If the secondary seal has a sealing
lip, place it towards valve bore.
Do not use hydrocarbon based grease. Use silicone
based lubricants such as DOW# 111, DOW 4, DOW 44,
GENERAL ELECTRIC COMPOUND G661, AND RHONE -
POULENE RHODORSIL III
8.
Apply recommended silicon lubricant on the chamfered edge of the gate (2).
9.
Lower the actuator, tower and gate package on the body and fasten with bolts (5).
10.
Lubricate valve grease nipples (8) as instructed in
Lubrication
.
11.
Reconnect automatic actuator to power supply and remove locking pins (13).
12.
Run a few test strokes before the pipeline is pressurized.
DANGER
WARNING
