Instruction manual

Type MR105
10
and damage, make certain the drain
valve (if used) is properly closed after
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1. Isolate the regulator from the system in steps 2
and 3.
2. Close the upstream shut-off valve to the
regulator inlet.
3. Close the downstream shut-off valve to the
regulator outlet.
!
WARNING
To avoid personal injury or damage of
internal parts from a pressure-loaded
actuator, carefully vent the regulator spring
case pressure prior to outlet pressure.
4. If the actuator is pressure loaded, vent the
loading pressure slowly to release pressure in the
spring case.
Note
To avoid internal damage due to
reverse pressurization of main valve
components, make certain pressure
reducing regulator outlet pressure is
bled prior to inlet pressure.
5. Slowly open the downstream vent valve to vent
downstream pressure.
6. Leave the downstream vent valve open to vent
inlet pressure and to release all remaining
pressure in the regulator.
7. If the regulator has the drain valve option, slowly
open valve to drain uid inside valve body. Make
sure to close valve after uid has been drained.
Maintenance
!
WARNING
Personal injury, equipment damage or

if seals are not properly lubricated or
maintained. Due to normal part wear or
damage that may occur from external
sources, this regulator should be
inspected and maintained periodically.
The frequency of inspection,
maintenance and replacement of parts
depend upon the severity of service
conditions or the requirements of local,
state and federal regulations.
Regulators that have been disassembled
for repair must be tested for proper
operation before being returned to
service. Only parts manufactured
by Emerson™ should be used for
repairing Fisher
®
regulators. Restart
gas utilization equipment according to
normal start-up procedures.
Note
To protect against reduced performance,
make certain vents are not plugged
when conducting routine maintenance.
Annual Maintenance
The stem O-rings on the Type MR105 actuator can be
lubricated during regularly scheduled maintenance,
using the grease tting (key 44). Stem O-rings can be
checked for damage during normal operation. If line
pressure leakage or unexpected grease extrusion from
the actuator vent (key 26) is observed the stem O-ring
needs to be replaced.
Change Nameplate
Be certain that the nameplates are updated to
accurately indicate any eld changes in equipment,
materials, service conditions or pressure settings.
Disassembly
!
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.
Failure to properly follow maintenance
installation procedures when replacing
parts could result in regulator damage,
personal injury and property damage

regulators separation during testing or
after reinstallation in the pipe line.
Instructions are given below for the disassembly of
Type MR105 pressure reducing regulators. Suitable
lubricants are indicated on the assembly drawings.