No.
Service
Inter
val
Valve Condition
Good Adequate
Inadequate
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
Noaction;
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 4 continued: Service activities checklist
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 Safetyrelated Incident
1 Check the packing follower for proper tightness.
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 if all nuts and bolts are securely fastened.
Avoid critical operating conditions if excess noise or
vibration levels occur during operation.
3 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 5: Basic safety messages for maintenance the valve
After these requirements are confirmed, proceed with valve maintenance.
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.
9
MaxFlo 4 Control Valve FCD VLENIM0064-02-AQ – 09/16
flowserve.com
