Types 66, 66Z, and 66ZZ
8
Replacing Plug O-Ring or Metal Seated
Valve Plug
1. Remove hex screws (key 20) from the bottom
flange (key 7).
2. Remove the bottom flange and bottom flange
gasket (key 19). With the Type 66Z regulator, the
counter spring (key 38) will fall out when the
bottom flange is removed.
3. Remove the pipe plug from the side of the valve
body. To keep the valve stem (key 13) from
rotating, insert a 5/16-inch (7,94 mm) or smaller
rod into the pipe plug hole and through the hole
in the valve stem.
4.
For all regulators with a valve plug O-ring,
remove the stop nut (key 23), the disk retainer
(key 9), the plug skirt (key 10), the sealing washer
(key 37), and the plug O-ring (key 8). For the
Type 66Z regulator, also remove the lower spring
seat (key 17).
For a Type 66 metal-seated regulator,
remove
the stop nut (key 23) and the plug skirt (key 10).
5.
For all regulators with a valve plug O-ring,
place the sealing washer, the plug skirt, the
O-ring, and the disk retainer on the plug stem in
the order shown in Figures 6, 7, 8 and 9. For the
Type 66Z regulator, also place the counter spring
seat on the plug stem.
For a Type 66 metal-seated regulator,
place the
plug skirt (key 10) on the plug stem (key 13).
6. Secure the stop nut (key 23) to the plug stem.
7.
For the Type 66Z regulator,
place the counter
spring (key 38) against the lower spring seat
(key 17).
8. Install the bottom flange gasket (key 19) and the
bottom flange (key 7) on the valve body. Secure
the flange with the cap screws (key 20).
9. Remove the 5/16-inch (7,94 mm) or smaller rod
rod and replace the pipe plug (key 31) in the
valve body.
Replacing Main Spring, Main and
Balancing Diaphragms, and Seat Ring
Disassembly
1.
For all regulators,
remove the closing cap
(key 27) and closing cap gasket (key 26).
Remove all compression in the spring (key 6) by
turning the adjusting screw (key 25) out of the
spring case.
For the Types 66 and 66Z regulators,
remove
the adjusting screw (key 25), the upper spring
seat (key 24), and the spring (key 6).
For the Type 66ZZ regulator
(Figure 9), tip the
adjusting screw (key 25) to one side so that it can
be grasped and pull it, the spring retainer (key 43),
and the ten ball bearings (key 54) out of the
spring case. Unhook the spring (key 6) and
leave the spring retainer (key 43) and the ten ball
bearings (key 54) in the adjusting screw (key 25).
note
if a spring change is the only
maintenance required for the Type 66
or 66Z regulator, proceed to steps 16
through 19 in the assembly section. For
further disassembly, proceed to step 2.
2. Unscrew the diaphragm casing hex nuts (key 22)
and remove the cap screws (key 21).
3. If a special spring case orientation is required
for remote venting, mark the side of the
diaphragm casing flanges to aid in assembly.
Remove the upper diaphragm casing (key 2).
For the Type 66ZZ regulator,
unhook the spring
(key 6) from the plug stem (key 13).
note
if the spring change is the only
maintenance required for the Type 66ZZ
regulator, proceed to steps 16 through
19 in the assembly section. For further
disassembly, proceed to step 4.
4. Remove the valve body pipe plug from the side of
the body. To keep the valve plug from twisting,
insert a 5/16-inch (7,94 mm) or smaller rod
through the pipe plug hole and the hold in the
plug stem (key 13).
5. Remove the upper stop nut (key 23), washer
(key 36, except for the Type 66ZZ regulator),
the lower spring seat (key 17, except for the
Type 66ZZ regulator), and the upper diaphragm
plate (key 4).
6. Remove and inspect the main diaphragm (key 5).
If no further maintenance is needed, refer to
steps 13 through 19 in the Assembly section for
