Instructions EF35002 - 08/10
Camflex
®
II 35002 Series Control Valves
Figure 7
9.2.1 Hard Seat Lapping
Lapping is the process of working the valve sealing parts
against each other with an abrasive, to produce a close fit.
To perform the lapping operation, proceed as follows.
A.
Clean the seat ring sealing surface in the valve body and
the seat ring shoulder.
B.
Apply a small amount of fine grinding compound to the
seat ring shoulder.
Figure 8
C.
Insert the seat ring into the body and lap lightly by
rotating the seat ring in the body, ensuring that the
entire seat ring sealing surface in the valve body is
lapped. Do not rotate in one place.
Note: Figure 8 illustrates a simple tool which may
be fabricated to facilitate this lapping operation on
smaller valves.
D.
Remove seat ring and clean thoroughly.
E.
Place seat ring on a flat surface with the seating area
facing up.
F.
Apply a small amount of fine grinding compound to the
seat ring seating surface.
8
CAUTION
CAUTION
WARNING
DANGER
Ensure that the capscrew holes in the diaphragm case
and spring barrel are aligned to prevent twisting of the
diaphragm in aligning the holes. The diaphragm case
(42) is normally assembled with the air inlet port placed
on the bottom side of the actuator. Depending on the
desired location, it can be placed in any desired position
around the spring barrel which allows the capscrew holes
to line up. However, the drain hole in the spring barrel
must always be facing down to allow for draining of any
moisture which may enter the spring barrel cylinder (38). If
the valve is equipped with the optional purge line, that line
is inserted into the drain hole.
K.
Place the bead of the diaphragm (40) over the diaphragm
case lip (42) and carefully slide the diaphragm case (42)
down over the piston (43) until it seats on spring barrel (38).
(see Figure 7, Step C).
L.
Ensure that the diaphragm case (42) is evenly seated on
the spring barrel (38), insert the four capscrews (41) and
tighten evenly.
M.
Connect air supply line to diaphragm case (42).
N.
Turn on air supply and check for leaks.
O.
If necessary, reposition handwheel (53) and limit stop (77),
(optional) to desired location and place valve back in service.
9.2 Body S/A Internal Parts
During a maintenance of Camflex
®
II valve it is necessary
to inspect all the internal parts to determine if they are worn,
corroded and damaged, especially the following seating area:
– body and seat ring contact area.
– the seating surface of the plug and seat ring.
– the guide surface of the shaft and the guide bushing.
All parts which are damaged must be replaced by
original Masoneilan spare parts.
