Valve Maintenance - Flowserve Valtek GS V701 User Instructions

Valtek GS
WARNING
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.
NOTICE
such as PTFE. If over tightened, excessive friction 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).
NOTICE
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
Electric gear actuator
8
FCD VLEEIM0300-05 (EN/A4) November 2022
Due to risk of crushing hazard, do
not work between the yoke legs
Graphite packing commonly creates
more friction than other materials,
Over tightening can cause excessive
packing wear and high stem friction
Recommended Maintenance Actions
Inter-
val
Good
Bi- No action
weekly
Bi- No action
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
Bi- No action
weekly
No action; gear is lubricated for lifetime; overhaul or replace gear / actuator after
product lifecycle
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
15 1/2"
20 3/4"
25 1"
32 -
40 1 1/2"
50 2"
65 -
80 3"
100 4"
125 -
150 6"
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
Clean valve stem with a soft
cloth
Retighten leaky packing box
Retighten body bolting if
bonnet gasket leaks.
Clean actuator stem with a
soft cloth
PN 40 Class 150 Class 300
Nm ft lb Nm ft lb Nm
12,5 9.2 7,3 5.4 9,2
- - -
26 19.2
17 12.5 21
19 14.0 22 16.2 27
- - -
51 37.6
26 19.2 43
78 57.5 46 33.9 76
110 81.1 - - -
140 103.3 76 56.0 146 107.7
Inadequate
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
ft lb
6.8
-
15.5
19.9
-
31.7
56.0
-