Emerson Fisher LR128 - Page 12

B2615
INDICATOR
PROTECTOR
(KEY 22)
HEX NUTS
(KEY 4)
BONNET
(KEY 2)
O-RING
(KEY 28)
MAIN SPRING
(KEY 12)
CAP SCREWS
(KEY 3)
INDICATOR COVER
(KEY 21)
INDICATOR WASHER
(KEY 20)
INDICATOR FITTING
(KEY 19)
STEM
(KEY 15)
O-RING
(KEY 18)
DIAPHRAGM
(KEY 9) AND
PLUG ASSEMBLY
(KEY 11)
O-RING
(KEY 8)
CAGE
(KEY 7)
INLET STRAINER
(KEY 23)
MAIN VALVE BODY
(E-BODY)(KEY 1)
Figure 6. Type LR128 Main Body Assembly Diagram
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 10 and Table 9 for the Diaphragm Markings and
Diaphragm Imprint Codes. Key numbers for the following
assembly and disassembly procedure are referenced in
Figures 7 and 13.
1. Place a screwdriver or similar tool through the hole
in the top plug (key 5).
2. Remove the flanged 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).
4. Remove the diaphragm (key 9).
5. Remove the top plug O-rings (keys 14 and 70).
6. Check all components for damage or wear and
replace as necessary.
7. When reassembling, be sure to lubricate all
O-rings before installing and add a thread locking
compound to the threads of the top plug.
8. Reassemble in the reverse order. Hold the top
plug (key 5). Place the parts on the top plug in the
following order:
• O-ring (key 14)
• O-ring (key 70)
• Diaphragm (key 9)
• O-ring (key 10)
• Bottom Plug (key 11)
• Flanged Nut (key 13) [On 1 in. / DN 25 body,
lock washer (key 130) then socket head screw
(key 129)]
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 11).
9. Tighten flanged nut (key 13) to proper torque
(see Table 11).
10. Completely reassemble the unit according to the
assembly procedures provided on page 12.
12
Type LR128