Types 63EG and 1098-63EGR
12
2. Remove the closing cap (key 12), loosen the
locknut (key 11) and back out the adjusting screw
(key 10) until compression is removed from the
control spring (key 7).
3. Remove the machine screws (key 17) and
separate the spring case (key 2) from the body
assembly. Remove the control spring seat
(key 8), the control spring (key 7) and, if used, the
diaphragm limiter (key 40).
4. Lift out the diaphragm assembly (key 5) and valve
plug (key 4). Check the stem guide (key 9) and
restriction (key 20) for damage or plugging. The
Type 6358 has a restriction plug, not a restriction.
5. If necessary to replace the diaphragm assembly,
the valve plug (key 4), the valve spring (key 14) or
the stem O-ring (key 37), remove the connector
cap (key 6) and connector cap O-ring or gasket
(key 36) from the top of the diaphragm assembly.
Assembly
1. If removed, install the body plug O-ring (key 13)
over the body plug (key 3) and install the body
plug into the body (key 1).
2. Install the stem guide (key 9), if removed and
make sure to install the connector cap O-ring or
gasket (key 36) between the body (key 1) and the
stem guide.
Note
In step 3, if installing a different size
restriction, be sure to remove the code
letter on the bottom of the pilot and
indicate the new letter.
3. If the restriction or restriction plug (key 20) was
removed, coat the threads with lubricant and
install it.
4. If replacing the stem O-ring (key 37), sparingly
apply lubricant and install the O-ring over the valve
plug (key 4).
5. If removed, install the valve plug (key 4) and valve
spring (key 14) into the diaphragm assembly
(key 5). Install a replacement connector cap O-ring
or gasket (key 36) on the diaphragm assembly and
secure with the connector cap (key 6).
6. Install the diaphragm assembly (key 5) and push
down on it to see if the valve plug (key 4) moves
smoothly. The diaphragm assembly should stroke
approximately 1/16 in. / 159 mm after the valve
plug contacts the port.
Note
In step 7, if installing a control spring of
a different set pressure range, be sure
to remove the set pressure range on the
spring case and indicate the new range.
7. Stack the control spring (key 7), the control spring
seat (key 8) and, if used, the diaphragm limiter
(key 40) onto the diaphragm assembly (key 5).
Make sure to install the diaphragm limiter beveled
side up.
8. Install the spring case (key 2) on the body (key 1)
with the vent assembly (key 16) oriented to
prevent clogging or entrance of moisture. Install
the machine screws (key 17) and tighten in a
crisscross pattern, using 5 to 7 ft-lbs / 7 to 9 N•m
of torque.
9. Replace the closing cap gasket (key 19) and
install the closing cap (key 12). When all
maintenance is complete, refer to the Startup
and Adjustment section to put the relief valve or
backpressure regulator into operation and adjust
the pressure setting.
Parts Ordering
Each Type 63EG or 1098-63EGR relief valve is
assigned a serial number or FS number which can be
found on the nameplates. Refer to this number when
contacting your local Sales Office for assistance or
when ordering replacement parts.
When ordering a replacement part, be sure to include
the complete 11-character part number. Separate kits
containing all recommended spare parts are available
for both the main valve and pilot.
Note
In this parts list, parts marked NACE are
intended for corrosion-resistant service
as detailed in the NACE International
Standard MR0175-2003 and MR0103.
