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Type 1290
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.
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 general-purpose grease and installed gently
rather than forced into position. Be certain that the
nameplates are updated to indicate accurately 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.
All disassembly, trim change and
reassembly steps in this section may
be performed with the regulator in the
main line.
1. Remove the cap screws (key 3) on a cast iron
or steel body, or remove the hex nut (key 29, not
shown) on a stainless steel body. Pry the body flange
(key 2) loose from the valve body (key 1), and lift out
the trim package (Figure 3).
6
WARNING
Note
2. Perform any required inspection, cleaning or
maintenance on the exposed surfaces of the valve
body 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 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 flange
nut until its flange is aligned 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 (key 1) web and the body flange (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 hex
nuts (key 29, not shown). No particular trim package
orientation in the body is required.
Replacing Trim Parts
Perform this procedure if inspecting, cleaning or
replacing individual parts in a trim package. Key
numbers are referenced in Figure 6. An exploded view
of a standard full-capacity trim package only is shown
in Figure 4.
Access to the spring (key 9), indicator
fitting O-ring (key 21) or travel indicator
parts in step 1 can be gained without
removing the body flange (key 2).
1. Remove the indicator fitting (key 5) and attached
parts. Proceed to step 5 if only performing
maintenance on the fitting or attached parts.
2. Remove the cap screws (key 3) on a cast iron
or steel body, or remove the hex nut (key 29, not
shown) on a stainless steel body, and pry the body
flange (key 2) loose from the valve body (key 1).
3. Use the valve body (key 1) as a holding fixture
if desired. Flip the body flange (key 2) over, and
anchor it on the valve body as shown in Figure 5,
removing the pipe plug (key 31) first.
4. To gain access to the port seal (key 12), upper
seal (key 15), or valve plug parts, unscrew the seat
ring (key 13) from the cage (key 11) and the cage
from the body flange (key 2). For leverage, insert
a wrench handle or similar tool into the seat ring
Note
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