Types 1098-EGR and 1098H-EGR
20
4. To inspect the diaphragm (key 12) or other
internal parts, loosen the locknut (key 17) and
turn the adjusting screw (key 15) to remove all
spring compression.
5. Remove the diaphragm case cap screws (key 16)
and lift off the spring case (key 2). Remove the
upper spring seat (key 9) and regulator spring
(key 11). Remove the lower spring seat (key 8).
6. Remove the diaphragm (key 12) and examine for
damage. Replace if damaged.
7.
With diaphragm removed, check to be sure the
pressure registration hole is completely open and
free of all obstructions.
8. Reassemble in reverse order of the previous steps.
Lubricate the upper spring seat (key 9) and the
exposed threads of the adjusting screw (key 15).
Before tightening cap screws (key 16) be sure to
install the adjusting screw, if completely removed and
turn it down to obtain diaphragm slack. This allows
proper positioning of the diaphragm to permit full
travel of the valve plug (key 4). Complete reassembly
procedures and temporarily install a gauge in place
of the pipe plug (key 52). Turn the adjusting screw to
produce the desired outlet pressure values shown
in Table 2. Tighten the locknut to maintain the
desired setting.
Types 1098 and 1098H Actuator and
Pilot Mounting Parts
Perform this procedure if changing the actuator or
inspecting, cleaning or replacing actuator and/or
pilot mounting parts. Actuator part key numbers are
referenced in Figure 13 and mounting part numbers in
Figure 26, unless otherwise indicated.
1. The actuator and pilot(s) may be removed and
replaced as a unit by disconnecting the control line
and pilot supply line.
2. Access to all internal parts except the stem
O-rings, bearings and wiper (keys 6, 56 and 57)
may be gained without removing the bonnet
(key 3) or upper diaphragm case (key 2) from
the main valve or the pilot(s) from the bonnet
pipe nipple (key 23, Figure 23 or keys 37 and 39,
Figure 27). Disconnect the loading tubing (key 24,
Figure 23, 25 or 27) from the actuator elbow fitting
(key 25, Figure 23
or key 41, Figure 27) and with
a Type 61LD pilot also disconnect the tubing
(key 18, Figure 24) from the fitting tee.
3.
Remove the cap screws (key 10), nuts (key 11),
lower diaphragm case (key 1), diaphragm (key 7)
and diaphragm plate (key 8). To separate the stem
(key 12) from the diaphragm plate (key 8), remove
the stem cap screw (key 9).
4.
To remove the Type 1098 case O-ring
(key 5),
unscrew the four case cap screws (key 4),
remove the upper diaphragm case (key 2) and
remove the case O-ring.
To remove the Types 1098 and 1098H stem
O-rings
(key 6), remove the pilot(s) and pipe
nipple(s) if necessary. Unscrew either the
Type 1098 bonnet (key 3) or the Type 1098H
upper diaphragm case (key 2) and remove the
wiper ring, bearings and O-rings.
5. Lubricate both stem O-rings (key 6) and
wiper ring (key 57) and install them with the stem
bearings (key 56) in either the Type 1098 bonnet
(key 3) or in the Type 1098H upper diaphragm
case (key 2).
6.
For the Type 1098H actuator
, thread the upper
diaphragm casing (key 2) into the main valve body.
For the Type 1098 actuator
, lubricate the case
O-ring (key 5) and install it in the bonnet (key 3). Line
up the holes in the upper diaphragm casing (key 2)
and the bonnet; insert and tighten the four case cap
screws (key 4) to secure the parts together. Thread
the bonnet into the main valve body.
7. Secure the diaphragm plate (key 8) to the stem
(key 12) with the stem cap screw (key 4). Lay the
entire diaphragm (key 7), diaphragm plate and
stem assembly into the lower diaphragm case
(key 1) so the diaphragm convolution laps up
over the diaphragm plate according to
Figure 13.
Then install the stem slowly up into the bonnet
(key 3) to prevent stem or O-ring damage and
secure the lower diaphragm case to the upper
diaphragm case (key 2) with the cap screws
and nuts. Tighten the cap screws and nuts
evenly in a crisscross pattern to avoid crushing
the diaphragm.
8.
Grease the stem O-rings through the zerk fitting
(key 28) until excess grease emerges from the
vent (key 27).
9. Install the pipe nipple(s) and pilot(s) if they were
removed during maintenance. Connect the
actuator loading tubing if it was disconnected.
