Fisher 67CF Instruction Manual page 6

67C Series
!
To avoid personal injury, property
damage, or equipment damage
caused by sudden release of pressure
or explosion of accumulated gas,
do not attempt any maintenance or
disassembly without first isolating the
regulator from system pressure and
relieving all internal pressure from
the regulator.
Types 67C, 67CR, 67CS, and 67CSR
Trim Maintenance
Key numbers are referenced in Figures 3, 4, and 12.
1. Remove four bottom plate screws (key 3) from the
bottom plate (key 39) and separate the bottom
plate and O-ring (key 4) from the body (key 1).
2. Inspect the removed parts for damage and debris.
Replace any damaged parts.
3. To remove the valve cartridge assembly, grasp
the end of cartridge (key 10) and pull it straight
out of body (key 1). Replace with new cartridge
assembly. The cartridge assembly may be
disassembled and parts may be cleaned or
replaced. If the soft seat (key 15) was removed,
make sure it is properly snapped into place before
installing the valve cartridge assembly.
4. Check O-ring (key 14) for wear and replace, if
necessary. Apply lubricant to the O-ring and place
in the body. Align cartridge key to keyway in body
and insert. Reinstall the O-ring (key 4), secure
the bottom plate (key 39) with screws (key 3), and
torque to 15 to 30-inch-pounds (1,7 to 3,4 N•m).
Diaphragm Maintenance
Key numbers are referenced in Figures 3 and 4.
1. Back out the adjusting screw or handwheel (key 18)
until compression is removed from the spring (key 17).
2. Remove the spring case screws (key 3) to separate
the spring case (key 7) from the body (key 1).
Remove the upper spring seat (key 20) and spring
(key 17).
3. Remove the diaphragm assembly (key 16),
inspect the diaphragm, and replace the assembly,
if necessary.
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waRnIng
4. Place the diaphragm assembly (key 16) on the
body (key 1) as shown in Figure 3 or 4. Push
down on the diaphragm assembly to make sure
the valve plug (key 11) strokes smoothly and
approximately 1/16-inch (1,6 mm).
In step 5, if installing a control spring of
a different range, be sure to delete the
spring range originally appearing on the
label and indicate the new spring range.
5. Stack the control spring (key 17) and upper spring
seat (key 20) onto the diaphragm assembly (key 16).
6. Install the spring case (key 7) on the body (key 1)
with the vent oriented to prevent clogging or entrance
of moisture. Install the six spring case screws (key 3)
using a crisscross pattern and torque to 15 to
30-inch-pounds (1,7 to 3,4 N•m).
on Types 67CS and 67CSR, lubricate
the adjusting screw (key 18) thread to
reduce galling of the stainless steel.
7. When all maintenance is complete, refer to the
Startup and Adjustment section to put the regulator
back into operation and adjust the pressure
setting. Tighten the locknut (key 19) if used, and
install the closing cap (key 33) if used .
Types 67CF, 67CFR, 67CFS, and 67CFSR
Filter Element and Trim Maintenance
Key numbers are referenced in Figures 5, 6, and 12.
1. Remove four dripwell screws (key 3) from the
dripwell (key 5) and separate the dripwell and
O-ring (key 4) from the body (key 1). The filter
retainer (key 9), thrust washer (key 37), filter
element (key 6), and gasket (key 26) may come
off with dripwell. If not, remove these parts.
2. Inspect the removed parts for damage and debris.
Replace any damaged parts. If a replacement is
not available, the filter element may be cleaned.
3. To remove the valve cartridge assembly, grasp the
end of cartridge and pull it straight out of body
(key 1). Replace with new cartridge assembly.
The cartridge assembly may be disassembled and
parts may be cleaned or replaced. If the soft
seat (key 15) was removed, make sure it is
properly snapped into place before installing the
valve cartridge assembly.
note
note