Types 67, 67H, 67HR, 67R, 67SS, and 67SSR
4
Maintenance
Regulator parts are subject to normal wear and must be
inspected and replaced as necessary. The frequency of
inspection and replacement of parts depends upon the
severity of service conditions and upon applicable codes
and government regulations.
If used, the inlet screen assembly (key 24, figure 3)
may need to be cleaned periodically.
To avoid personal injury, property dam-
age, 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.
Note
If sufficient clearance exists, the body
assembly (key 1) may remain mounted in a
line or panel or on other equipment unless
the inlet screen assembly (key 24 if used,
figure 3) needs to be cleaned or replaced
or the entire regulator will be replaced.
Unless otherwise noted, key numbers are referenced in
figure 2 for a Type 67, 67H, 67HR, or 67R regulator and
in figure 3 for a Type 67SS or 67SSR regulator.
Trim Parts
1. Remove body plug (key 3 or 3A) to let the plug
spring (key 6) and plug/stem assembly (key 4) drop
freely from the body (key 1).
2. Inspect the removed parts, replace if necessary.
Make sure the plug seating surfaces are free from debris.
On Types 67 and 67R, inspect body plug O-ring (key 3B),
replace if necessary. Type 67 and 67R regulators manu-
factured before May 1999 need to have the body plug
gasket (key 23, figure 2) and the body plug (key 3)
replaced with a new body plug assembly (key 3), which
includes the body plug (key 3A) and the body plug O-ring
(key 3B). On Types 67SS and 67SSR, inspect the body
plug O-ring (key 23, figure 3), replace if necessary.
3. Install the body plug O-ring (key 3B, figure 2 or key
23, figure 3) over the body plug (key 3A, figure 2 or key
3, figure 3).
4. Stack the plug spring (key 6) and the plug/stem
assembly on the body plug (key 3A, figure 2 or key 3,
figure 3), and install the body plug with stacked parts
into the body (key 1).
Diaphragm Parts
1. Remove the closing cap if used (key 28, figure 3),
loosen the locknut if used (key 11), and back out the
adjusting screw or handwheel (key 10) until compres-
sion is removed from the control spring (key 9).
2. Remove the machine screws (key 12) and separate
the spring case (key 2) from the body assembly (key 1).
Remove the control spring seat and control spring
(keys 8 and 9).
3. Remove the diaphragm assembly (key 7) and
inspect the diaphragm.
4. Install the diaphragm assembly (key 7) and push
down on it to see if the plug/stem assembly (key 4)
strokes smoothly and approximately 1/16 inch (2 mm).
Note
In step 5, if installing a control spring of
a different range from the one that was
removed, be sure to delete the spring
range originally appearing on the
control spring label (key 20, not shown)
and indicate the new spring range.
5. Sparingly apply lubricant to the control spring seat
(key 8). Stack the control spring and control spring seat
(keys 9 and 8) onto the diaphragm assembly (key 7).
6. Install the spring case (key 2) on the body assembly
(key 1) with the vent hole oriented to prevent clogging or
entrance of moisture. Install the machine screws (key 12)
and torque to
15 to 20 inch-pounds (1,9 to 2,6 N•m)
.
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 if used (key 11).
8. With a Type67SS or 67SSR regulator, install a
replacement closing cap gasket (key 32, figure 3) if
necessary.
9. Install the closing cap if used (key 28, figure 3).
Parts Ordering
When corresponding with the Fisher sales office or
sales representative about this regulator, include the
type number and all other pertinent information stamped
on the bottom of the body and on the control spring
label. Specify the eleven-character part number when
ordering new parts from the following parts list.
