Valtek GS General Service Valve FCD VLENIM0300-00-A4 08/14
9
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No.
Service
Inter-
val
Valve Condition
Good Adequate Inadequate
5 Preventive overhaul of
the valve
Dependent upon results of previous maintenance (see numbers 1 to 4 above) or a
minimum once every 60 months
6
Operation test
No action Perform 3 full strokes if packing and / or bonnet tightening is
modified; check for leakage
Recommended maintenance actions using the Logix digital positioner with ValveSight diagnostic solution software
7
Visual inspection of
diagnostic interface
Weekly No action -
valve is healthy
Take action per warning Overhaul or replace required part per
alarm
8
Check health parameter
of valve
Warn-
ing
No action -
valve is healthy
Replace packing box compo-
nents per warning
Overhaul or replace valve after alarm
9
Check health parameter
of actuator
Warn-
ing
No action -
actuator is
healthy
Check and retighten air
supply
Overhaul or replace actuator after
alarm
10
Check health parameter
of control
Warn-
ing
No action -
control is
healthy
Overhaul or replace valve; trim and bonnet components must be
checked and / or repaired after alarm
11
Check health parameter
of positioner
Warn-
ing
No action -
positioner
is
healthy
Start step test Overhaul or replace positioner after
alarm
Table 5: Service activities check list
Prior to valve maintenance, we require, that you check the following conditions to reduce the risk of malfunction and safety
related incidents.
No.
Check Possible malfunction or safety related incident
1 Check the packing follower for proper tightness. The packing follower is spring loaded and factory adjusted.
If leakage is detected around the packing follower tighten it
clockwise using a wrench in quarter turn intervals until the
leakage stops.
Wrench Size Adjustment Interval Maximum Adjustment
SW 24 ~
15
/16 AF
quarter turn
one,
three-quarter turn
SW 32 ~ 1
1
/4 AF
SW 46 ~ 1
13
/16 AF one complete turn
Table 7: Packing Adjustment
Do not overtighten packing.
Overtightened packing can cause excessive packing wear and
high stem friction that may impede plug movement.
If leakage cannot be stopped, the packing must be replaced.
2 Check for signs of gasket leakage through the bonnet
and end flanges.
Tighten the bonnet bolting nuts. See Section 13: Disassembly
and Reassembly for instructions. Also see Table 4 in Section 10.
3 Check if all nuts and bolts are securely fastened. Avoid critical operating conditions if excess noise or
vibration levels occur during operation.
4 Check valve for smooth, full-stroke operation. Un-
steady stem movement could indicate an internal
valve problem.
Internal valve failure requires an immediate overhaul or control
valve replacement by qualified stuff.
Table 6: Basic safety massages for maintenance the valve
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