Valtek FlowTop
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.
If over tightened, excessive friction
NOTICE
may impair smooth control.
2. Adjust instrument signals to ensure a full stroke.
3. Check the packing box bolting to ensure the correct
adjustment (See Section 11: Valve Maintenance).
Over tightening can cause excessive
NOTICE
packing wear and high stem friction
that may impede plug movement.
11 Valve Maintenance
Maintenance intervals and service life of a valve can only be
determined empirically on site. The intervals specified in the
User Instructions are recommendations and serve only as a
guide. Under problematic operating conditions, maintenance
intervals may be significantly reduced. We strongly recom-
Service
No.
1
Visual inspection of
the valve
2
Visual inspection of
the packing
Preventive change of
the PTFE-packing
Preventive change of
the Graphite-packing
3
Visual inspection of
body bolting
4
Visual inspection of
the actuator
5
Preventive overhaul of
the valve
6
Operation test
FCD VLEEIM1485-04 (EN/A4) November 2022
Recommended Maintenance Actions
Inter-
val
Good
Bi-
No action
Clean valve stem with a soft
weekly
cloth
Bi-
No action
Retighten leaky packing box
weekly
Dependent upon results of previous maintenance (see numbers 1 and 2 above) or a
minimum of once every 24 months
Dependent upon results of previous maintenance (see numbers 1 and 2 above) or a
minimum of once every 18 months
Yearly No action
Retighten body bolting if
bonnet gasket leaks.
Bi-
No action
Clean actuator stem with a
weekly
soft cloth
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
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 Table 4).
Pressure
Size
1/2"
3/4"
1"
1 1/2"
2"
3"
4"
6"
1)
V750 is designed for Class 150 while V752 is desigend for Class 300
Table 4: Recommended Body Bolt Torque Values
mend a site survey followed by establishing a documented
procedure for performing the maintenance work. Maintenance
personnel should perform and log the work accordingly. The
data collected can be used as a basis for dynamically deter-
mining the maintenance intervals and activities.
Valve Condition
Adequate
Overhaul or replace valve after product
lifecycle
Replace leaky packing box immedi-
ately
Remove from service and replace body
bolting immediately if gasket leakage
persists or if bolting is damaged
Overhaul or replace actuator after prod-
uct lifecycle
Class 150
Class 300
1)
Nm
ft lb
Nm
ft lb
15
11
15
11
17
13
21
16
22
16
27
20
26
19
43
32
46
34
76
56
76
56
146
108
Inadequate
flowserve.com
1)
9
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