6
3 R 71 EN - Issue 9/2020
Servicing is facilitated if the valve needs no support. If necessary, you
can support the valve by the body, using regular pipe clamps and
supports. Do not fasten supports to the flange bolting or the actuator,
see Fig. 8.
3.3 Actuator
The valve closed and open positions are indicated as follows:
•
by a marking on the actuator, or
•
by a groove at the end of the valve shaft.
Both show the position of the segment with respect to the flow port. If
there is any uncertainty about the marking, check the position of the
segment by the groove at the end of the shaft, see Fig. 9.
If possible, install the valve so that the actuator can be disconnected
without removing the valve from the piping.
The actuator must not touch the pipeline, because pipeline vibration
may damage it or interfere with its operation.
In some cases, for instance when a large-size actuator is used or
when the pipeline vibrates heavily, supporting the actuator is
recommended. Contact Neles for further information.
3.4 Commissioning
Ensure that no dirt or foreign objects are left inside the valve or
pipeline. Flush the pipeline carefully. Keep the valve entirely open
during flushing.
Check all joints, pipings and cables.
Check that the actuator, positioner and limit switches are correctly
adjusted. Refer to their installation, operation and service manuals.
The gland packing may leak after prolonged storage. Tighten the
packing evenly at both nuts until the leakage stops.
4 MAINTENANCE
4.1 Maintenance general
Although Neles valves are designed to work under severe conditions,
proper preventative maintenance can significantly help to prevent
unplanned downtime and in real terms reduce the total cost of
ownership. Neles recommends inspecting the valves at least every
five (5) years. The inspection and maintenance interval depends on
the actual application and process condition. The inspection and
maintenance intervals can be specified together with your local Neles
experts. During this periodic inspection the parts detailed in the Spare
Part Set should be replaced. Time in storage should be included in
the inspection interval.
Maintenance can be performed as presented below. For
maintenance assistance, please contact your local Neles office. The
part numbers in the text refer to the exploded view and to the parts
list in Section 10, unless otherwise stated
Fig. 7
Installing the valve into pipeline
Fig. 8
Supporting the valve
NOTE:
When installing the actuator, make sure that the valve-actuator
combination functions properly. Detailed information on actuator
installation is given in Section 6 or in separate actuator
instructions.
Fig. 9
Closed and open positions
CAUTION:
Observe the safety precautions mentioned in Section 1.8
before maintenance!
CAUTION:
When handling the valve or the valve package as a whole,
bear in mind the weight of the valve or the entire package!
CAUTION:
For safety reasons the retaining plates MUST always be
installed acc. to Section 4.2.
CLOSED
OPEN
