4 GV 71 en
5
3.2
Installation into the pipeline
3.2.1
Pipeline cleaning
Make sure no foreign particles, such as sand or pieces of
welding electrode, are in the pipeline, they may damage
the sealing surfaces.
3.2.2
Installation valve
The valve has an arrow indicating the flow direction. Install
the valve in the pipeline so that the flow direction of the
valve corresponds to the flow direction marked on the pipe.
The mounting orientation of the valve should be vertical
position as it is shown on Fig.4.
Choose flange gaskets according to the operating
conditions.
Do not attempt to correct a pipeline misalignment by
means of flange bolting.
Loads on the valve body from pipeline vibrations can be
reduced by supporting the pipeline properly. Reduced
vibration also increases the lifetime of the positioner.
Where necessary, you can support the valve by the body, using
regular pipe clamps and supports. Do not fasten supports to
the valve or flange bolting or to the actuator, see Fig. 4.
3.2.3
Hydrostatic testing and Line flushing
When the line is hydrostatic test and flushing, the control valve
should not used as an isolating valve.
Make sure the control valve always be opened position before
start this process.
Otherwise valve and trim damage or failure of the seals could
result.
Flushing and hydrostatic test kit can be purchased from Metso.
3.3
Control valve assembly
Check all joints, piping and cables.
Check that the actuator stop screws, positioner and limit
switches are calibrated. Refer to their installation, mainte-
nance and operating manuals.
3.4
Valve insulation
If necessary, the valve may be insulated. Insulation must not
continue above the upper level of the valve body, see
Figure 5.
4
MAINTENANCE
4.1
General
The Neles Single Seated Globe valves require no regular
maintenance. However, check the gland packing for leak-
age. This section outlines the maintenance that can be car-
ried out by the user.
The numbers in parentheses refer to the parts lists and the
exploded views of the valve in Section 9.
NOTE:
For any other mounting position, please consult the
factory.
Fig. 4
Installing the control valve into pipeline using sup-
ports
CAUTION:
Flushing trim kit sholud be installed in the valve (espe-
cially 'Tendril trim' application) to protect the original trim
and the flow passages while the valve installation and line
flushing. Unless this caution could result in unstable con-
trol, valve leakage and exessive noise.
Fig. 5
Insulation of the valve
CAUTION:
Observe the safety precautions listed in Section 1.7
before starting work!
CAUTION:
When handling the valve or the control valve assem-
bly, take its weight into account!
NOTE:
If you send the valve to the manufacturer for repair, do not
dismantle it. Clean the valve carefully, including the inside.
For safety reasons, inform the manufacturer of the nature
of the medium when you send the valve.
NOTE:
Always use original spare parts to make sure the valve
functions as intended.
