Actuator Maintenance - Flowserve FlowAct Series User Instructions

Due to risk of crushing hazard, do
WARNING
not work between the yoke legs
while the valve is in operation.
Prior to start-up, we strongly recommend that you:
1. Stroke the valve and compare the plug position
indicator on the stem clamp to the stroke indicator
plate. The plug should change position in a smooth,
linear fashion.
Graphite packing commonly creates
NOTICE
more friction than other materials,
such as PTFE. If over tightened, excessive friction may
impair smooth control.
2. Adjust instrument signals to ensure a full stroke.

12 Actuator Maintenance

Maintenance intervals and service life of an actuator is unique
to local environmental conditions at the site. The intervals
specified in the User Instructions are recommendations and
serve only as a guide. Under difficult operating conditions,
maintenance may be more frequent. We strongly recom-
Service
No.
1 Visual inspection of
the actuator
2 Visual inspection of
the tightness
Preventive maintenance
of the diaphragm
3 Visual inspection of
case bolting
4 Operation test
Recommended maintenance actions using the Logix digital positioner with ValveSight diagnostic solution software
5 Visual inspection of
diagnostic interface
6 Check health parameter
of actuator
7 Check health parameter
of positioner
FlowAct Diaphragm Linear Actuator
Recommended Maintenance Actions
Inter-
val
Good
Bi- No action Clean actuator stem with a
weekly soft cloth
Bi- No action Retighten leaky air supply,
weekly case bolting
Dependent upon results of previous maintenance (see numbers 1 and 2 above) or a
minimum of once every 10 years
Yearly No action Retighten case bolting if
diaphragm leaks.
No action Perform 3 full strokes using air supply; check for leakage
Weekly No action - Take action per warning
valve is healthy
Warn- No action - Check and retighten air
ing actuator is supply
healthy
Warn- No action - Start step test
ing positioner is
healthy
Table 6: Service activities check list
3. Check the packing box bolting to ensure the correct
adjustment.
Over tightening can cause excessive
NOTICE
packing wear and high stem friction
that may impede plug movement.
4. Continuously increase load until operation parameters
are reached.
5. Minor relaxation of the flange bolting is possible after
initial assembly. Retorque the bonnet flange bolting
if necessary before installation or following an initial
temperature excursion to ensure the bonnet gaskets
do not leak.
(See User Instructions - Control Valve).
mend a site survey followed by a documented procedure for
performing the maintenance work. Maintenance personnel
should perform and log the work accordingly. The data col-
lected can be used as a basis for dynamically determining the
maintenance intervals and activities.
Valve Condition
Adequate
Repair or replace actuator according to
product life cycle
Replace leaky air supply, diaphragm,
O-ring immediately
Remove from service and replace
case bolting, diaphragm immedi-
ately if external leakage persists or
if bolting is damaged
Overhaul or replace required part per
alarm
Overhaul or replace actuator after
alarm
Overhaul or replace positioner after
alarm
FCD VLENIMFACTA4 10/16
Inadequate
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