Watts Autotrol Magnum (CV+ Series) - Manual (Page 58)

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9.1 Magnum Valve Cartridge Removal
Procedure
Removal of cartridges should be done only after
reviewing all other possible causes of the
problem(s) being addressed. There may be some
difficulty removing cartridges in valves that have
been in service for a period of time. Scale or iron
build up around the O-ring seals may cause
breakage in the cage assembly of the cartridge. If
this occurs the cartridge must be replaced.
To remove the number 1 or number 2 cartridges the
control must be removed first (see Assembly
instruction in the Magnum instruction manual, page 3).
What follows is a step-by-step procedure for cartridge
removal:
1. Remove the four bolts securing the cartridge.
2. There are two parts or sections in the “cap” of the
cartridge assembly. The first part is the cover for
the diaphragm. The second part is attached to the
main cartridge assembly. This part is in contact
with the body of the Magnum valve. When referring
to inserting screwdrivers for cartridge removal it is
the area between the Magnum valve body and the
second part of the cartridge that is being referred
to. See Figure 9.1.
3. A small flat blade screwdriver should be inserted as
indicated in drawing. Pry a small opening between
the Magnum valve body and the second part of the
cartridge. This will allow the insertion of two larger
flat blade screwdrivers that will be used to remove
the cartridge.
4. Insert the two larger flat blade screwdrivers at the
10 o’clock and 2 o’clock positions on the cartridge.
These should be inserted approximately 1/2 inch
into the opening created by the small blade
screwdriver. Use the two screwdrivers to slowly
move the cartridge out of the valve body.
5. The cartridge should be removed for inspection.
Look for damaged O-ring or debris on sealing
surface ring of poppet.
There are two nipples at the 5:30 and 6:30 locations on
the inside of the cartridge cap which transfer water to
and from the diaphragm. There are two O-rings
associated with the nipples. The O-rings must be in
place when the cartridge is re-installed into the valve
body.
Figure 9.1
Correct Insertion Point
Incorrect Insertion Point
Remove bolts (4)