Ensure that all nuts, fittings, and cables are properly fastened.
If so equipped, check that the actuator, positioner and/ or
switch is correctly adjusted. Actuator adjustment is explained
in Section 5. To adjust any accompanying device(s) refer to
the separate control equipment instruction manuals.
4.
MAINTENANCE
4.1
General
Although Metso’s
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.
Always loosen and tighten fasteners with the appropriate
wrench to avoid damaging the valve, handle, linkage,
actuator, fittings or flats.
1. Routine Maintenance consists of tightening the
compression plate hex head cap screws periodically to
compensate for the wear caused by the stem turning
against the stem seals. Check to make sure that the
compression plate hex head cap screws are tightened to
the torque listed in (Table 1).
2. Overhaul Maintenance consists of replacing seats and
seals. A standard Repair Kit consisting of these parts may
be obtained from your Metso Distributor (See Table 4).
TABLE 1
Hex Head Cap Screw Torque
Valve Size
Torque IN•LBS
Torque N•m
1/4” & 3/4” (DN 8 & 20)
15
1.7
1” & 1-1/4” (DN 25 & 30)
20
2.3
1-1/2” & 2” (DN 40 & 50)
32
3.6
NOTE: Repair Kits contain the seats and stem seals for
both the fire-tested and non-fire-tested valves. Refer to the
ASSEMBLY Section for details on the correct installation of
these parts.
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:
WEAR ANY PROTECTIVE CLOTHING OR EQUIPMENT NORMALLY
REQUIRED WHEN WORKING WITH THE FLUID INVOLVED.
DEPRESSURIZE THE PIPELINE AND CYCLE THE VALVE AS FOLLOWS:
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
Disassembly
NOTE: If complete disassembly becomes necessary it is
recommended to replace all seats and seals. Refer to the
Repair Kit chart (see TABLE 4)
IMO 7/18
IMO-213 EN
5
NOTE: Always use original OEM parts to make sure that the
valves functions properly.
This section covers disassembly of the non-welded valve
after removal from the piping. NOTE: Seal-welded, ASME
Class 600 [9_A & 9_M] products cannot be disassembled.
1. Comply fully with all WARNINGS prior to working on
the valve.
2. Open and close the valve and leave in the closed
position.
3. Remove the handle nut (16), lockwasher (19), and
handle (17).
4. Remove hex head cap screws (29), disc springs (31) and
compression plate (20).
5. Clamp the valve body (1) securely in a vise.
6. Unscrew and remove the body cap (2)
NOTE: Thread locking compound is used to prevent
unwanted rotation of the body cap (2). Heat may be
required for disassembly.
7. Remove and discard the old body seal (6). Be careful
not to damage the sealing surfaces.
8. With the ball in the closed position, remove ball (3) and
seats (5). NOTE: A piece of wood or other soft material
may be used to unseat the parts from the opposite side.
Be careful not to damage the ball or seating surfaces in
the body.
9. Press the stem (4) into the body (1) and remove it
through the open end.
10. Carefully remove and discard the stem seal (8) and stem
bearing (24) being careful not to damage the bearing
surfaces. NOTE: Fire-Tite® construction contains a
secondary stem seal (7) and 2 stem bearings (13), in
place of the non-
Fire-Tite
stem bearing (24). Also, valves
with graphite stem seals (8) have an additional upper
stem bearing (10) and an anti-extrusion ring (55).
11. Use a wire brush to remove any remaining thread lock
compound from the body cap (2) and body (1) threads. Be
careful not to scratch or damage the body seal surfaces.
4.3
Checking Parts
1. Clean all disassembled parts.
2. Check the stem (4) and ball (3) for damage. Pay
particular attention to the sealing areas.
3. Check all sealing and gasket surfaces of the body (1)
and body cap (2).
4. Replace any damaged parts.
5. Replace any fastener where the threads are damaged
or have been heated, stretched or corroded.
6. Replace any parts that have cracks, gouges or pits that
will affect sealing.
