Parts Ordering - Emerson S402Y Instruction Manual

Type S402Y
Make sure the regulator vent, vent assembly, or vent
pipe does not become plugged by mud, insects, ice,
snow, paint, or etc. The vent screen aids in keeping
the vent from becoming plugged, and the screen
should be clean and properly installed.
Replace any regulators that have had water in their
spring case and/or show evidence of external or
internal corrosion. Checking for internal corrosion may
require complete removal of the adjusting screw and
shutdown of the gas system.
Older regulators are more likely to fail because
of worn, damaged or corroded parts. Periodic
repair of the diaphragm assembly, orifice tube
assembly, and other parts subject to wear and/
or corrosion; or a systematic replacement program
should be based on the regulator's performance,
the service area's environment, installation practices,
and historical experience.
The following procedures are for complete regulator
disassembly and assembly. All pressure must be
released from the regulator before the following steps
can be performed. While using the maintenance
procedures, refer to Figure 3 for key number locations.
The regulator may remain in the pipeline
during maintenance procedures unless
the body (key 1) is replaced or removed
for repairs.
Control Spring or Diaphragm
assembly Replacement
1. Remove the closing cap (key 11) and turn the
adjusting screw (key 12) counterclockwise until
all compression is removed from the control
spring (key 6).
2. If changing the control spring (key 6) is the only
maintenance required, remove and replace the
control spring.
3. To replace or reposition the spring case, remove
the spring case screws (key 13) and lift off the
spring case assembly (key 3).
4. For diaphragm maintenance, remove the
diaphragm assembly by tilting it toward
the outlet so that the cam stem may be
pulled up and out of the orifice tube
assembly (key 7).
6
note
5. Reassemble in the reverse order of the above
procedures. Place the diaphragm assembly into
position in the lower casing, being sure the
cam stem (key 10) is properly inserted into the
orifice tube assembly (key 7). Note that the
diaphragm plate is marked with "Inlet" and
"Outlet". Install the spring case assembly (key 3)
and using a crisscross pattern, tighten the spring
case screws (key 13).
Orifice Tube Assembly Replacement
1. Remove the spring case screws (key 13) which
hold the lower casing to the body (key 1).
When the actuator assembly is
separated from the body, do not rotate
the diaphragm/relief valve assembly
without removing the spring case
screws (key 13). The assembly
incorporates an anti-rotation design,
any rotational movement will damage
the cam stem/diaphragm assembly.
2. Remove the diaphragm/relief valve assembly
(key 10) by tilting it toward the outlet so that the
cam stem slides up and out of the orifice tube
assembly (key 7).
3. Remove the orifice tube screws (key 9) and then
the orifice tube assembly (key 7).
4. Reassemble in the reverse order of the above
procedure. Be sure to use a new orifice tube
O-ring (key 8), body with O-ring lubricant.
5. Tighten the spring case screws (key 13) to
80-inch-pounds (9.0 N•m) of torque.
6. If necessary, refer to the installation and/or the
startup and adjustment procedures.

Parts Ordering

When corresponding with your local Sales Office about
this equipment, always reference the Type number that
can be found stamped on the regulator.
When ordering replacement parts, reference the key
number of each needed part as found in the following
parts list. Separate kits containing all recommended
spare parts are available. If construction changes
are made in the field, be sure that the information
on the regulator is also changed to reflect the most
recent construction.
note