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6.1.4 Pinning
By means of a hammer, introduce the pin into the hole.
Complete the pinning operation, taking care to ensure that
the pin is recessed by the same amount at both sides.
Using a ball tooling and hammer, caulk the pin hole edge
of the plug.
Place the assembly in the soft jaw chuck of a lathe to check
alignment of the two parts; correct any alignment defects.
6.2 Assembly of Ring or
Spring-Energized Seal Ring
6.2.1 41305 valve
(Figures 9, 18 and 19)
These valves have a spring-energized seal rings
composed of a PTFE-based jacket maintained expanding
by a spring.
To insert the ring into the plug groove:
• Lubricate the entry chamber.
• Place the ring over the conical top of the plug so that
the lips of the ring face to the pressure (see Figure 9).
To the assembly direction of the radial ring (11F) on the
plug (see Figure 9).
Flow Tends to Open: the open side is in the top.
Flow Tends to Close: the open side is in the lower part.
• Slip to the ring into the groove (without spinning it) as
shown in Figure 9. This operation can be facilitated by
heating the ring. The temperature of the ring should
not exceed 150°C.
• Keep the ring retained until it returns to room
temperature and goes back in place within the groove.
Clamping with a collar (SERFLEX type) will help to
properly position the ring.
FTO
Pushing
Direction
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FTC
Pushing
Direction
Figure 9
6.2.2 41405 and 41505 valves
(Figures 17 and 19)
These valves are equipped with metal rings; the inner ring
has a straight cut while the outer ring has a staggered cut.
To insert the rings into the cage groove, open the rings
slightly by hand and slide them, one after the other, along
the plug making sure that the parts are not damage.
Note: The cuts in the outer and inner rings are to be
placed at about 180° from each other.
6.2.3 41605 valve
(Figure 19)
These valves are equipped with an inner elastomeric ring
and a PTFE gasket.
Insert the elastomeric ring (11D) in the groove.
Place the PTFE gasket (11C) at a temperature of 100°C
(boiling water) to 160°C for a few minutes to facilitate
insertion, then slide along the plug until it slips into the
groove.
For optimum insertion of the ring, a Serflex type ring
compressor can be used to compress the ring in the
groove for several minutes.
6.2.4 41905 valve
(Figure 19)
These valves are equipped with rings; the inner metal ring
has a straight cut and the outer ring is made of graphite.
The new graphite seal ring (11A) is supplied in the form of
a closed ring in which a notch must be cut before being
inserted.
Graphite seal rings are fragile and the following operations
must be carried out very carefully.
Using a sharp blade, carry out two V notches on the two
opposite faces. Hold the ring on either side of the notch
between the thumb and index and bend until it breaks.
Using a very fine file, adjust each end of the ring so that
its external circumference corresponds to the internal
circumference of the inside diameter of the cage (16).
To adjust the length of the ring correctly, insert the new
graphite ring into the cage, with the ring against the
inner wall of the hole in the cage, allowing minimum play
between the two ends of the ring.
To insert the inner ring, then the graphite ring into the
Masoneilan 41005 Series Globe Valve Instruction Manual | 13
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