W3116
!
WARNING
7
Type 1190
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 the service conditions
or the requirements of local, state and federal
regulations. Due to the care Emerson takes in
meeting all manufacturing requirements (heat treating,
dimensional tolerances, etc.), use only replacement
parts manufactured or furnished by Emerson.
Lubrication
The stem O-rings on the Type 1098 actuator should be
lubricated, using the grease fitting (key 28, Figure 7)
as part of a preventive maintenance program. Line
pressure leakage or unexpected grease extrusion
from the actuator vent (key 27, Figure 7) during normal
operation indicates stem O-ring damage. All O-rings,
gaskets and seals should be lubricated with a good
grade of general-purpose grease and installed gently
rather than forced into position. Be certain that the
nameplates are updated to accurately indicate any field
changes in equipment, materials, service conditions or
pressure settings.
To avoid personal injury resulting from
sudden release of pressure, isolate
the pilot, supply and main regulators
from all pressure and cautiously
release trapped pressure from the pilot
regulator, Types MR95H and 1098-EGR
regulator before attempting disassembly.
Type EGR Main Valve
Replacing Quick-Change Trim Package
Perform this procedure if replacing the entire trim package
(Figure 3). Key numbers for both the complete main valve
and its trim package are referenced in Figure 6.
Note
All disassembly, trim change and
reassembly steps in this section can be
performed with the Type EGR main valve
in the pipeline.
1. Disconnect the supply pressure tubing from the
top of the Type 1098-EGR main valve actuator.
Remove the cap screws or stud bolts (key 3). Pry
the body flange (key 2) loose from the valve body
(key 1) and lift out the trim package (Figure 3).
2. Perform any required inspection, cleaning or
maintenance on the exposed surfaces of the valve
body or trim package. Replace the gasket (key 4)
and cage O-ring (key 17) as necessary.
3. On a pre-built replacement trim package, check
indicator zeroing by unscrewing the indicator
protector (key 19) and seeing if the flange of the
flange nut (key 22) lines up evenly with the bottom
marking on the indicator scale (key 18). If not,
remove the indicator scale and separate the flange
nut and hex nut (key 8). Hold the indicator scale
against the indicator fitting (key 5) with the scale
base resting against the shoulder of the fitting
and turn the indicator nut to align its flange with
the bottom scale marking. Then lock both nuts
against each other and install the indicator scale
and protector.
4. Lightly coat the cage seating surfaces of the valve
body web and the body flange seating surfaces of
the valve body neck with a good grade of general
purpose grease. Install the trim package and
secure it evenly with the cap screws or stud bolts.
No particular trim package orientation in the body
is required.
Figure 4.
Exploded View of Full-Capacity Trim
Package Assembly
SEAT RING (KEY 13)
CAGE O-RING (KEY 17)
CAGE (KEY 11)
VALVE PLUG (KEY 16)
BODY FLANGE (KEY 2)
SPRING SEAT (KEY 28)
INDICATOR STEM (KEY 10)
SPRING (KEY 9)
INDICATOR FITTING
O-RING (KEY 21)
INDICATOR FITTING (KEY 5)
HEX NUT (KEY 8)
INDICATOR SCALE (KEY 18)
PORT SEAL (KEY 12)
UPPER SEAL (KEY 15)
PIPE PLUG (KEY 31)
E-RING (KEY 23)
STEM O-RING (KEY 7)
O-RING RETAINER (KEY 6)
FLANGE NUT (KEY 22)
INDICATOR PROTECTOR (KEY 19)
