Types 1098-EGR and 1098H-EGR
14
working Monitor
1. Slowly close the downstream block valve and the
hand valve in the downstream pressure control line.
2. Slowly close the upstream block valve and the
hand valves in both pilot supply lines.
3. Slowly open all vent valves and permit all pressures
to bleed out of the piping and regulators.
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 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.
The stem O-rings (key 6, Figure 13) on the Type 1098
or 1098H actuator should be lubricated during regularly
scheduled maintenance, using the grease fi tting
(key 28, Figure 13). Stem O-rings can be checked
for damage during normal operation by line pressure
leakage or unexpected grease extrusion from the
actuator vent (key 27, Figure 13). Unless otherwise
specifi ed, 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 (key 13,
Figure 13) are updated to accurately indicate any fi eld
changes in equipment, materials, service conditions or
pressure settings.
!
wARNINg
To avoid personal injury resulting
from sudden release of pressure,
isolate the regulator from all pressure
and cautiously release trapped
pressure from the regulator before
attempting disassembly.
Type EgR Main Valve
Replacing Quick-Change Trim Package
Perform this procedure if the entire trim package is
replaced. Key numbers for both the complete main
valve and its trim package are referenced in Figures 11
and 12. Some replacement trim package assembly
numbers are listed in a table in the parts list.
Note
All disassembly, trim change and
reassembly steps in this section may be
performed with the regulator in the main
line and without disconnecting the pilot
supply or control lines.
1. Remove the cap screws (key 3) with a cast iron
body or remove the stud bolt nuts (key 29, not
shown) with a steel body. Pry the body fl ange
(key 2) from the valve body (key 1) and lift out the
trim package.
2.
Perform any required inspection, cleaning or
maintenance on the exposed surfaces of the valve
body (key 1) or trim package. Replace the gasket
(key 4) or 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 fl ange of the
indicator 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 indicator nut and hex nut (key 8). Hold the
indicator scale against the indicator fi tting (key 5)
with the scale base resting against the shoulder of
the fi tting and turn the indicator nut until its fl ange
is aligned with the bottom scale marking. Then
lock both nuts against each other and install the
indicator scale and protector.
4. Coat the cage seating surface of the valve body
(key 1) web and the body fl ange (key 2) 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
(key 3) or stud bolt nuts (key 29, not shown).
No particular trim package orientation in the body
is required.
BODy FlANgE
P1507
SEAT RINg
SCREwS INTO CAgE
CAgE SCREwS INTO
BODy FlANgE
Figure 8.
Trim Package Removal
