IMO-227 EN
5
IMO 8/17
will normally be associated with large actuators, extended
stems, or where severe vibration is present. Please contact
Metso for advice.
3 .5 Commissioning
Ensure that there is no dirt or foreign objects left inside the
valve or pipeline. Flush the pipeline carefully. Make sure
that the valve is fully open when flushing.
Ensure that all nuts, fittings, and cables are properly fastened.
If so equipped, check that the actuator positioner and/
or switch are correctly adjusted. Actuator adjustment is
explained in Section 7 .8. To adjust any accompanying
device(s) refer to the separate control equipment instruc-
tion manuals.
4 MAINTENANCE
4 .1 General
Although Metso
Jamesbury
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
recommends inspecting valves at least every five (5) years.
The inspection and maintenance frequency depends on
the actual application and process condition. Routine main-
tenance consists of tightening the stud nuts (item 30 in
Figure 19) periodically to compensate for stem seal wear.
Always loosen and tighten fasteners with the appropriate
wrench to avoid damaging the valve, handle, linkage, actu-
ator, fittings or flats.
Overhaul maintenance consists of replacing seats and
seals. A standard repair kit consisting of these parts may be
obtained through your authorized Metso Distributor.
NOTE: Repair kits include thrust bearings (13), secondary
stem seal (7), seats (5), body seal (6) and stem seals (8).
Refer to the Repair Kit chart (see Table 9A or 9B).
WARNING:
FOR YOUR SAFETY IT IS IMPORTANT THE FOLLOWING
PRECAUTIONS BE TAKEN PRIOR TO REMOVAL OF THE VALVE FROM
THE PIPELINE OR BEFORE ANY DISASSEMBLY:
1.
WEAR ANY PROTECTIVE CLOTHING OR EQUIPMENT NORMALLY
REQUIRED WHEN WORKING WITH THE FLUID INVOLVED.
2.
DEPRESSURIZE THE PIPELINE AND CYCLE THE VALVE AS FOL-
LOWS:
A.
PLACE THE VALVE IN THE OPEN POSITION AND DRAIN THE
PIPELINE.
B.
CYCLE THE VALVE TO RELIEVE RESIDUAL PRESSURE IN THE
BODY CAVITY BEFORE REMOVAL FROM THE PIPELINE.
C.
AFTER REMOVAL AND BEFORE ANY DISASSEMBLY, CYCLE
THE VALVE AGAIN SEVERAL TIMES.
4 .2
Actuated Valve
It is generally most convenient to detach the actuator and its
auxiliary devices before removing the valve from the pipe-
line. If the valve package is small or if it is difficult to access, it
may be more practical to remove the entire assembly.
NOTE: To ensure proper reassembly, observe the position
of the actuator and positioner/limit switch with respect to
the valve before detaching the actuator.
WARNING:
ALWAYS DISCONNECT THE ACTUATOR FROM ITS POWER SOURCE,
PNEUMATIC, HYDRAULIC OR ELECTRICAL, BEFORE ATTEMPTING
TO REMOVE IT FROM THE VALVE!
WARNING:
DO NOT REMOVE A SPRING-RETURN ACTUATOR UNLESS A STOP-
SCREW IS CARRYING THE SPRING FORCE!
1. Detach the air supply, electrical supply, hydraulic supply
and control signal cables or pipes from their connectors.
2. Remove the actuator mounting bracket screws (6) and
lockwashers (7) (see Figure 15 or 17).
3. Lift the actuator straight up in line with the valve stem
until the coupling between actuator drive and valve
stem is completely disengaged.
4. Place actuator in a safe location to avoid damage or
personal injury.
4 .3
Manual Valve – with Handle
1. Remove the handle screw (6) and washer (5). Lift the
handle (1) straight up in line with the valve stem until
it is completely disengaged (see Figure 12).
2.
Remove the four bracket screws (3) and lock washers (4).
3. Lift the handle bracket (2) straight up in line with the
valve stem until it is completely disengaged.
4. Place all disassembled handle parts in small basket or
bag to prevent damage or loss.
4 .4
Disassembly – Bare Stem Valves
Tools needed to disassemble
Jamesbury
3”, 4” & 6” 7000
series valves, such as the “insert field wrench” mentioned
in step 3 and shown in (Figure 5), may be ordered as
(MA0026426) for 3” & 4” (DN 80 & 100) Series 7000, and
(MA0185235) for 6” (DN 150) Series 7000 from your local
Metso Distributor.
NOTE: lf complete disassembly becomes necessary; it is
recommended to replace all seats and seals. Refer to the
Repair Kit chart (see Table 9A or 9B).
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