Flowserve Valtek GS V701 User Instructions page 9

Valtek GS
Service
No.
5 Preventive overhaul of
the valve
6
Operation test
Recommended maintenance actions using the Logix digital positioner with ValveSight diagnostic solution software
7
Visual inspection of
diagnostic interface
8
Check health parameter
of valve
9
Check health parameter
of actuator
10 Check health parameter
of control
11 Check health parameter
of positioner
Prior to valve maintenance, we require, that you check the following conditions to reduce the risk of malfunction and safety
related incidents.
No.
1 Check the packing follower for proper tightness.
2 Check for signs of gasket leakage through the bonnet
and end flanges.
3 Check if all nuts and bolts are securely fastened.
4 Check valve for smooth, full-stroke operation. Un-
steady stem movement could indicate an internal
valve problem.
FCD VLEEIM0300-05 (EN/A4) November 2022
Inter-
val
Good
Dependent upon results of previous maintenance (see numbers 1 to 4 above) or a
minimum once every 60 months
No action Perform 3 full strokes if packing and / or bonnet tightening is
modified; check for leakage
Weekly No action - Take action per warning
valve is healthy
Warn- No action - Replace packing box compo-
ing valve is healthy nents per warning
Warn- No action - Check and retighten air
ing actuator is supply
healthy
Warn- No action - Overhaul or replace valve; trim and bonnet components must be
ing control is checked and / or repaired after alarm
healthy
Warn- No action - Start step test
ing positioner is
healthy
Table 5: Service activities check list
Check
Table 6: Basic safety massages for maintenance the valve
Valve Condition
Adequate
Overhaul or replace required part per
alarm
Overhaul or replace valve after alarm
Overhaul or replace actuator after
alarm
Overhaul or replace positioner after
alarm
Possible malfunction or safety related incident
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 ~ / AF
15
16
SW 32 ~ 1 / AF quarter turn
1
4
SW 46 ~ 1 / AF
13
16
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.
Tighten the bonnet bolting nuts. See Section 13: Disassembly
and Reassembly for instructions. Also see Table 4 in Section 10.
Avoid critical operating conditions if excess noise or
vibration levels occur during operation.
Internal valve failure requires an immediate overhaul or control
valve replacement by qualified stuff.
Inadequate
one,
three-quarter turn
one complete turn
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