Emerson Fisher Y692 Instruction Manual page 6

Type Y692
5. Install the disk assembly (key 25) and secure it
with the cotter pin (key 14).
6. If necessary, install a replacement body gasket
(key 16) into the body (key 28).
7. Slide the union nut (key 19) as far as it will go onto
the lower casing assembly (key 20). Install both
halves of the split ring (key 17) into the slots of the
lower casing assembly (key 20) and secure them by
sliding the union nut down on the split ring.
8. Install the lower casing assembly (key 20) with the
attached split ring (key 17) and union nut (key 19)
so that the pitot tube fits into the outlet of the body.
9. Tighten the union nut (key 19) until the lower
casing assembly (key 20) is secure on the body
(key 28).
Diaphragm and Spring case area
This procedure is for gaining access to the spring,
diaphragm and lever assembly. All pressure must be
released from the diaphragm case assembly before
these steps can be performed.
To Change the Control Spring:
1. Remove the closing cap (key 3, if required) and
turn the adjusting screw (key 2) counterclockwise
until all compression is removed from the control
spring (key 1).
2. Remove the adjusting screw (key 2) and spring
seats (keys 4 and 44). Change the control spring to
match the desired spring range.
3. Replace the spring seats (keys 4 and 44) and the
adjusting screw (key 2).
4. Install a replacement closing cap gasket (key 35),
if necessary and reinstall the closing cap (key 3,
if used).
5. If the spring range was changed, be sure to change
the stamped spring range on the nameplate.
To Disassemble and Reassemble
Diaphragm Parts:
Key numbers are referenced in Figure 6.
1. Remove the closing cap (key 3, if required) and
turn the adjusting screw (key 2) counterclockwise
to remove the adjusting screw (key 2) and the
control spring (key 1).
6
2. Remove the hex nuts (key 22), cap screws
(key 21) and spring case (key 23).
3. In a regulator with a light control spring (see
Figure 4): Lift the upper spring seat (key 44), lower
spring seat (key 4) and control spring (key 1) off the
diaphragm and plate assembly (key 5).
In a regulator with a heavy control spring (see
Figure 5): Lift the two spring seats (key 4) and
control spring (key 1) off the diaphragm and plate
assembly (key 5).
4. Remove the diaphragm and plate assembly (key 5)
by tilting them so that the pusher post (key 8) slips off
the lever assembly (key 9).
5. To separate the diaphragm assembly (key 5) from
the attached parts, unscrew the diaphragm cap
screw (key 30) from the pusher post (key 8).
6. To replace the lever assembly (key 9), remove
the machine screws (key 11). To replace the stem
(key 13) or access the stem seal O-ring (key 15,
for Types with external pressure Registration)
perform body area maintenance procedure
steps 1 and 3 and pull the stem (key 13) out of the
lower casing assembly (key 20).
7. Inspect the stem (key 13) and replace if required.
Install the stem into the lower casing assembly
(key 20) and perform body area maintenance
procedure steps 5 through 9 as necessary.
8. Install the lever assembly (key 9) into the stem
(key 13) and secure the lever assembly (key 9)
with the machine screws (key 11).
9. During the assembly procedure, use lubricants
on parts as indicated in Figure 6 and replace parts
as required.
10. Install the parts on the pusher post (key 8) in the
order listed below:
• Diaphragm plate gasket (key 7)
• Lower diaphragm plate (key 6)
• Diaphragm and plate assembly (key 5) pattern
side up
• Lower spring seat (key 4)
11. Insert and tighten the diaphragm cap screw
(key 30) to secure the diaphragm parts to the
pusher post (key 8). Carefully tighten to a torque of
7 to 9 ft-lbs / 9 to 12 N•m.
12. Install the assembled parts in the lower casing
(key 20). Make sure that the lever (key 9) fits in
the pusher post (key 8) and that the holes in the
diaphragm align with the holes in the lower casing.