Technical Specifications

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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
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
4.4 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 17).
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 17).
To carry out this operation safely, screws of the diameter
and length indicated in the table in Figure 2 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
Figure 2