4 GV 74 en
5
Do not remove the flow port protectors until immediately
before installation of the valve into the pipeline.
The valve is delivered in the closed position. A valve
equipped with a spring-return actuator is delivered in the
position determined by the spring.
3
VALVE INSTALLATION
3.1
General
Remove the flow port protectors and check that the valve is
clean inside.
3.2
Installation into the pipeline
Make sure no foreign particles, such as sand or pieces of
welding electrode, are in the pipeline, they may damage
the sealing surfaces.
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 does not restrict the
operation of the valve, actuator or positioner. You should,
however, avoid installing the valve so that the shaft points
downwards as impurities in the fluid may enter and dam-
age the gland packing. Any leak from the packing may then
damage the actuator. See Fig. 6.
Choose flange gaskets according to the operating condi-
tions.
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 sup-
ports to the valve or flange bolting or to the actuator, see
Fig. 4.
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 Fig. 5.
4
MAINTENANCE
4.1
General
The Neles series GW 3-way valves require no regular main-
tenance. However, check the gland packing for leakage.
This section outlines the maintenance that can be carried
out by the user.
The numbers in parentheses refer to the parts lists and the
exploded views of the valve in Section 9.
CAUTION:
When handling the valve or the control valve assem-
bly, take its weight into account!
Fig. 4
Installing the control valve into pipeline using
supports
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.
