Type LR125
10
CAUTION
W7394
Provide adequate support to the bonnet
when disassembling Type LR125 regulator
installed in a vertical installation or
other application where the bonnet is
not oriented upward. Without adequate
support, the bonnet may fall and cause
physical injury when the cap screws
are loosened.
3. Remove the diaphragm (key 9) and plug (key 11)
assembly and bonnet O-ring (key 28).
4. Pull out the cage (key 7), O-ring (key 8) and
inlet strainer (key 23).
5. Clean parts and replace if necessary.
Assembly
1. Install the inlet strainer (key 23) into the body (key 1).
Note
When installing in a vertical orientation,
apply lubricant to the bottom of the inlet
strainer (key 23) to help hold parts in
place while installing cage.
2. Lightly lubricate and install the cage O-ring (key 8).
3. Apply lubricant lightly to all O-rings or the mating
part before installing them.
4. Install the cage (key 7) and lightly lubricate and
install the bonnet O-ring (key 28).
5. Lubricate the top and bottom of the outer edge
(bead area) of the diaphragm (key 9) and place
diaphragm and plug (key 11) assembly on the
cage (key 7).
6. Lubricate the top plug O-ring (key 14).
7. If travel indicator was removed, lightly lubricate
the travel indicator assembly threads (key 19)
and screw it into the bonnet (key 2). See Travel
Indicator Assembly Maintenance for maintenance.
8. Install the bonnet (key 2) in proper orientation.
9. Lubricate cap screws (key 3) and secure the
bonnet (key 2), using an even crisscross pattern. It
may be necessary to push down on bonnet to start
cap screws. Tighten cap screws to proper torque
(see Table 9).
Diaphragm and Plug Assembly
Maintenance
The diaphragm and plug assembly can be replaced
as a single unit (a diaphragm cartridge) or individual
components within the assembly can be replaced.
When replacing individual components, inspect each
component for damage and wear and replace parts as
needed. See Figure 9 and Table 7 for the Diaphragm
Markings and Diaphragm Imprint Codes. Key numbers
for the following assembly and disassembly procedure
are referenced in
Figures 6 and 12.
1. Place a screwdriver or similar tool through the hole
in the top plug (key 5).
2. Remove the flanged hex nut (key 13) from
the bottom plug (key 11). This loosens the
entire assembly.
Note
On 1 in. / DN 25 body remove the socket
head screw (key 129) and lock washer
(key 130) from the bottom plug.
3. Remove the bottom plug (key 11) and the bottom
plug O-ring (key 10).
FLANGED
HEX NUT
(KEY 13)
BOTTOM PLUG
(KEY 11)
DIAPHRAGM
(KEY 9)
TOP PLUG O-RING
(KEY 14)
TOP PLUG
(KEY 5)
O-RING
(KEY 70)
O-RING
(KEY 10)
Figure 6.
Diaphragm and Plug Assembly Components
