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4.3 Disassembly of Valve Plug Stem
The valve plug stem is screwed and pinned into the valve
plug (15).
To dismount the stem, the valve plug must be held as
indicated below, taking care not to damage the guiding
surfaces; the plug stem pin (9 ) is then removed. By means
of flats or using a nut and counter-nut on the end of the
stem, unscrew the stem taking care not to apply a bending
moment which could deform it.
Figure 1 - Valve Plug Stem
4.4 Disassembly of the Auxiliary Pilot
Plug
When the valve is of the 41405 type.
In the case of 50, 80 or 100 mm (2”, 3” or 4”) valves (Figure
15).
Exert a sufficient force on the auxiliary pilot plug (20) to
compress the spring washers (12). The retaining ring (19)
can then be removed, releasing the auxiliary pilot plug and
spring washers.
In the case of 150 to 400 mm (6” to 16”) valves (Figure 16).
To carry out this operation safely, screws of the diameter
and length indicated in the table in hereunder must be used.
Thread the socket head cap screws through the holes in the
auxiliary pilot plug (20). Tighten until the retainer ring (19)
can be removed. Loosen the screws gradually. Remove the
auxiliary pilot plug and the spring (12).
Valve size
Pilot Dismounting Screws Size
mm
in.
Qty.
Length
Dia.
mm
in.
150
6
2
57
2.25 1/4” – 20 UNC 2A
200
8
2
70
2.75
3/8” – 16 UNC 2A
250
10
2
63.5
2.5
300
12
3
101.5
4
400
16
3
63.5
2.5
Cylindrical machining diameter of the jaw =
plug shank diameter: Dia. A
Soft metal
vise draw
Do not tight
on the plug
skirt
Tight only on
this no guiding
surface
Stop pin
integrated in
vise jaw and
inserted into a
plug hole
4.5. Disassembly of 41705 HTS Plug
This plug type can only be serviced in the field by factory
qualified Masoneilan valve maintenance technicians due to
critical features that cannot be easily addressed in the field.
Note to factory qualified Masoneilan valve technicians:
See the latest revision of CES-189 for instructions and
maintenance values.
The metal piston rings (11) can be replaced in the field per
instructions for plug type 41505.
5. Maintenance –
Repair
5.1 Packing Box
Packing box maintenance is one of the principle action items
of routine servicing. Tightness of the packing is maintained
by packing compression. Compression is achieved by
evenly tightening the packing flange nuts (3) against the
packing flange (4). Care must be taken not to over tighten
as this could prevent smooth operation of the valve. If all
compression is used up and the valve leaks, then new
packing is required.
CAUTION
CAUTION
WARNING
DANGER
Valve must be isolated and the pressure vented be-
fore performing packing box maintenance.
Proceed as follows :
5.1.1 Braided PTFE with Carbon or Aramid Core
(Standard)
Note:
The Braided PTFE/Carbon or Aramid packing rings
have a skive cut allowing packing replacement without
disconnecting the plug stem from the actuator connector
or actuator stem.
A.
Loosen and remove packing flange nuts (3).
B.
Lift the packing flange (4) and packing follower (23) up
the valve stem.
Note: They may be taped in place to keep them out of
the way before proceeding.
C.
By means of a hooked instrument, remove packing
rings ensuring not to damage the sealing surfaces of the
packing box or plug stem.
Note:
On valves equipped with an optional lubricator
connection, the lantern ring must also be removed to
gain access to lower packing rings.
D.
Replace packing rings.
Note:
Assemble and compress rings one at a time
into packing box. The skive cut of each packing ring
must be placed about 120 degrees apart.
Note:
On valves equipped with an optional lubricator
connection, pay close attention to the number and
order of packing rings an lantern are arranged. This
will help with assembly.
Summary of Contents for Masoneilan 41005 Series
Page 50: ...Notes...
Page 51: ...Notes...
