Masoneilan 41005 Series Globe Valves with API-6A Capabilities Instruction Manual
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© 2023 Baker Hughes Company. All rights reserved.
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 20)
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 cage
groove, slightly open the rings by hand and slide them one
after the other along the plug, taking care not to damage the
parts.
Note:
The cuts on each ring are to be placed at about
180° from each other.
6.2.5 41375 high temperature valve (232°C to
316°C)
(Figure 19)
These valves are equipped with a seal ring composed of a
jacket and a metallic spring and two backup rings (11G).
Assemble the different parts as shown in Figure 19, starting
by the backup rings.
6.3 41405 Valve Plug and Cage
Assembly
(Figure 18)
6.3.1 Assembly of valve plug and auxiliary
pilot plug
Assemble, as appropriate, the flat spring or the coil springs
then the valve plug/plug stem assembly.
Using the same tools as those used for disassembly
(see chapter “Disassembly”), compress the springs so
that the retaining ring can be inserted in the groove of the
main plug.
6.3.2 Assembly of cage
Place the cage over the valve plug assembly via the top
of the plug stem. When doing so, take particular care to
position the ring correctly.
6.4 Assembly of the Parts Inside
the Valve Body
(Figures 15,16,17,18,19)
Proceed as follows:
•
After checking that the surfaces are perfectly clean,
place the seat gasket (14) in the valve body, making sure
that it is centered as well as possible.
•
Mount the seat ring or the diffuser seat (13).
•
Mount:
– The cage (16) for 41305, 41605 and 41905 valves,
– The cage/plug/stem assembly for 41405 valves,
– The STACK assembly (making sure that the face
with the smallest number of holes is in contact with
the seat ring), and cage (16) for 41375 valves.
For the double-cage assembly, carry out the following
operations:
•
Put the inner cage (16) upside down,
•
Encase the outer cage (75) on the inner cage, maintain
them together with the two pins (76).
•
In the case of valves other than 41405 valves, insert
the valve plug/stem/ring assembly into the cage taking
particular care as it goes past the ring or spring-
energized seal ring.
•
In the case of valves with a N.D. less than 150 (6”), place
the body/cage gasket in the valve body, making sure that
it is centered as well as possible.
•
For valve sizes 150 to 400 mm (6 to 16”), insert either the
cage gasket (24) or the flat spring washer (17).
•
For valve sizes 450, 600 and 750 mm (18, 20 and 24”),
insert either the first cage gasket, the cage washer and
the second cage gasket or the flat spring depending
on the type of valve, then place the body gasket (10) in
the valve body making sure that it is centered as well as
possible.
Put these parts as shown in Figure 19, the angle of
90° of the backup ring in front of the extrusion gap
between cage and plug.
Summary of Contents for Masoneilan 41005 Series
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