61 Series Pilot And Type 1806 Check Valve; Type Y600Am Pilot; Body Area - Emerson Fisher 1098-EGR Instruction Manual

Types 1098-EGR and 1098H-EGR
61 Series Pilot and Type 1806
Check Valve
Perform this procedure if changing the control spring
for one of a different range or if inspecting, cleaning
or replacing check valve or any other pilot parts. Pilot
part key numbers are referenced in Figures 17 and 18
and mounting part and check valve key numbers in
Figure 24.
1. Remove the pilot from the pipe nipple (key 24)
unless just the control spring is to be changed.
2. To gain access to the control spring or other
internal parts, remove the closing cap assembly
(key 5) and relieve control spring (key 7)
compression by turning the adjusting screw
(key 6) counterclockwise. Change the control
spring and install the adjusting screw and closing
cap assembly if no other maintenance will be
performed. Make sure of the proper control spring
setting according to the Installation and Startup
section and restamp the nameplate if necessary.
3. For any other internal maintenance, relieve control
spring compression according to step 2. Then
remove the cap screw (key 20) and separate the
pilot into three sections: spring case (key 1), body
(key 2) and bottom cover (key 3).
4. To inspect the two diaphragms (keys 14 and 15)
thoroughly, remove the diaphragm nut (key 11), hex
nut (key 19) and the upper and lower relay heads
(keys 16 and 17). The projecting prong in the body
may be used as the restraining member to keep the
yoke (key 4) from turning while removing the nuts.
Also inspect the O-ring (key 12) and replace any
parts as necessary.
5. Take the yoke (key 4) and attached parts out of
the body to examine the disk holder assembly
(key 9). Remove the relay orifice (key 8) to check
for clogging and replace if necessary.
6. To replace the disk holder assembly, first unscrew
the bleed orifice (key 10). Remove it and the
associated parts. Then unscrew the disk
(key 9) holder assembly from the bleed valve
(key 26) to gain access to the relay spring
(key 13). Clean or replace any parts as necessary
before reassembling.
7. Upon reassembly, pay particular attention to the
following assembly suggestions:
a. Before replacing the diaphragm case (key 2) or
spring case (key 1), be sure the yoke assembly
18
is positioned so that it will not bind or rub on the
prong in the relay body.
b. Avoid wrinkling the diaphragms (key 14 and 15)
when replacing the diaphragm case (key 2)
and spring case (key 1).
c. Replace the diaphragm case (key 2), carefully
working the upper relay diaphragm (key 14)
into the recess in the diaphragm case. If the
diaphragm case rocks with respect to the pilot
body, the diaphragm is probably wrinkled.
d. Replace the spring case (key 1), using care
to smooth the lower relay diaphragm (key 15)
evenly into the recess in the pilot body.
e. Install the eight cap screws (key 20), tightening
them down evenly in a crisscross pattern to
avoid crushing the diaphragm. Recommended
final torque on these cap screws is 10 to
12 ft- lbs / 14 to 16 N•m.
8. After assembly, make sure of the proper control
spring setting according to the Installation and
Startup section and restamp the nameplate
(key 27) if necessary.
9. To gain access to the Type 1806 check valve,
disconnect the tubing at the connector fitting
and unscrew the check valve. Make sure the
spring closes the ball or replace the check valve
if necessary. Install the check valve back in
the pipe tee (key 16) and reconnect the tubing
(key 18) and connector fitting.

Type y600AM Pilot

Body Area

This procedure is for gaining access to the disk assembly,
orifice and body O-ring. All pressure must be released
from the diaphragm casing and the disk assembly must
be open, before these steps can be performed. Part key
numbers are referenced in Figure 20.
1. Remove the cap screws (key 2) and separate the
diaphragm casing (key 4) from the body (key 1).
2. Remove and inspect the body seal O-ring (key 11)
and the backup ring (key 48).
3. Inspect and replace the orifice (key 5) if
necessary. Protect the orifice seating surface
during disassembly and assembly. Lubricate the
threads of the replacement orifice with proper
amount of anti-seize lubricant and install with 29 to
38 ft-lbs / 39 to 52 N•m of torque.