Actuator; Commissioning; Maintenance; Maintenance General - Metso Neles L4 Series Intallation, Maintenance And Operating Instructions

2 L6 70 en
Table 5. Stud bolt dimensions (mm), L4F/D
ASME Class 600 flanges
Size Thread øH
NPS K mm
Length
04 7/8-UNC 25,4 210
06 1-8UN 28,4 250
08 1 1/8-8UN 31,7 290
10 1 1/4-8UN - 340
12 1 1/4-8UN - 410
14 1 3/8-8UN - 440
16 1 1/2-8UN - 490
20 1 5/8-8UN - 540
24 1 7/8-8UN - 610
28* 2-8UN - 680
32* 2 1/4-8UN - 710
36* 2 1/2-8UN - 770
*) flanges acc. to ASME B16.47 series A
Table 6. Stud bolt dimensions (mm), L6F
ASME Class 600 flanges. Both flanges included
Size Thread
NPS K
Length
06 1 UNC 165
08 1 1/8 - 8UN 190
10 1 1/4 - 8UN 215
12 1 1/4 - 8UN 220
14 1 3/8 - 8UN 235
16 1 1/2 - 8UN 255
18 1 5/8 - 8UN 275
24 1 7/8 - 8UN 330
28 2 - 8UN 364
30* 2 - 8UN 370
36* 2 1/2 - 8UN 410
*) flanges acc. to ASME B16.47 series A
3.2.1 Valve insulation
If necessary, the valve may be insulated. Insulation must not
continue above the upper level of the valve body, see Fig-
ure 9.
Insulation limit
Fig. 9 Insulation of the valve
3.3

Actuator

When installing the actuator on the valve, make sure that
the valve package functions properly. See instructions for
installing in Section 6.
Observe the space needed for removal of the actuator.
The upright position is recommended for the actuator cyl-
inder.
The actuator must not touch the pipeline, because pipeline
vibration may damage it or interfere with its operation.
In some cases, e.g. when a large-size actuator is used or
when the pipeline vibrates heavily, supporting the actuator
is recommended. Please contact Metso's Automation busi-
ness for further information.
L L1
Qty Length Qty
8 - -
12 - -
12 - -
12 160 8
16 170 8
16 170 8
16 200 8
20 210 8
20 230 8
24 250 8
28 230 8
28 260 8
L L1
Qty Length Qty
8 135 4
16 140 8
20 160 12
24 160 16
24 170 16
24 190 16
24 210 16
32 230 16
48 257 84
40 260 16
40 280 16
4

COMMISSIONING

Ensure that no dirt or foreign objects are left inside the
valve or pipeline. Flush the pipeline carefully. Keep the
L2
valve 30–40° open during flushing.
-
When starting up the pump, ensure that the valve in the
-
-
pipeline is closed or, at the very most, 20° open.
40
A waterhammer, which follows the start-up of high-capac-
45
44
ity pumps, creates a torque peak in the disc. This can dam-
60
age the pin connection between disc and shaft when the
48
valve is 30–90° open.
60
60
The packing construction is live loaded. If the leakage
55
occurs, re-tighten the gland nuts but don't exceed the val-
60
ues in the Tables 7, 8 and 9 by 50 % or do not fully compress
the disc springs.
5

MAINTENANCE

CAUTION:
Observe the safety precautions mentioned in Section
1.7 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 according to Section 5.3.
5.1

Maintenance general

Although Metso's 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. Metso recom-
mends 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 Metso 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 inter-
val.
Maintenance can be performed as presented below. Fo
maintenance assistance, please contact your local Metso
office. The part numbers in the text refer to the exploded
view and to the parts list in Section 9, unless otherwise
stated.
NOTE:
When sending goods to the manufacturer for repair, do
not disassemble them. Clean the valve carefully and flush
the valve internals.
For safety reasons, inform the manufacturer of the type of
medium used in the valve (include material safety data
sheets (MSDS)).
NOTE:
In order to ensure safe and effective operation, always use
original spare parts to make sure that the valve functions
as intended.
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