Emerson Fisher Accu-Pressure Y693 Instruction Manual page 6

Type Y693
To Disassemble and Reassemble
Diaphragm Parts:
For the aluminum lower casing version only:
Key numbers are referenced in Figures 3 and 4.
1. Remove the downstream external control line.
Remove the closing cap (key 3), and turn the
adjusting screw (key 2) counterclockwise to
remove the adjusting screw (key 2). Remove the
upper spring seat (key 4 or 44) and the control
spring (key 1).
2. Remove the hex nuts (key 22), cap screws
(key 21) and spring case (key 23).
3. Remove the diaphragm assembly (key 5) plus
attached parts by tilting them so that the pusher
post (key 8) slips off the lever assembly (key 49).
To separate the diaphragm (key 5) from the
attached parts, unscrew the spring holder cap
screw (key 30) from the pusher post (key 8).
4. Inspect the pusher post and replace if required.
5. To replace the lever assembly (key 49), remove
the machine screws (key 11), cotter pin (key 14)
and clevis pin (key 10). To replace the valve stem
(key 13), unscrew the cap screws (key 18) from the
body (key 28) and remove the lower casing assembly
(key 9). Pull the valve stem (key 13) out of the lower
casing assembly (key 9).
6. To inspect the body bushing (key 97), remove the
bushing snap ring (key 74) and carefully remove
the body bushing from the lower casing assembly
(key 9).
7. During the assembly procedure, use lubricants
on parts as indicated in Figure 4 and replace
parts as required.
8. Install the body bushing O-ring (key 64) on the body
bushing (key 97). A wiper retaining ring (key 63) is
required to hold the wiper (key 66) in place while the
bushing is installed into the lower casing assembly
(key 9). Ensure that the wiper is properly oriented with
the wiper lip pointing inward toward the diaphragm.
Install the bushing snap ring (key 74) to hold the body
bushing in place.
9. Apply a moderate coating of lubricant to the valve
stem (key 13). Install the stem O-ring (key 15) and
the two back-up rings (key 69, one on each side of
the O-ring) onto the valve stem (key 13).
10. Install the valve stem (key 13) from the body side
of the bushing, this is to ensure that the O-ring
groove does not damage the wiper.
6
11. Install the lever assembly (key 49) into the stem
(key 13) and insert the clevis pin (key 10) and cotter
pin (key 14). Secure the lever assembly (key 49)
with the machine screws (key 11). Carefully tighten
the machine screws to a torque of 7 to 9 ft-lbs / 9 to
12 N•m.
12. Install the diaphragm and plate assembly (key 5,
pattern side up) on the pusher post. Then install
the lower spring seat (key 4).
13. Lubricate the diaphragm cap screw threads
(key 30) and insert the cap screw 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.
14. Install the assembled parts in the lower casing
(key 9). Make sure that the lever (key 49) fits in
the pusher post (key 8) and that the holes in the
diaphragm align with the holes in the lower casing.
15. Install the spring case (key 23) on the lower
casing assembly (key 9) so that the vent assembly
(key 56) is correctly oriented, and secure with the
cap screws (key 21) and hex nuts (key 22) finger
tight only.
16. Insert the control spring (key 1) into the spring
case (key 23), followed by the upper spring seat
(key 4 or 44) and the adjusting screw (key 2).
17. Turn the adjusting screw (key 2) clockwise until
there is enough control spring (key 1) force to
provide proper slack to the diaphragm (key 5).
Using a crisscross pattern, finish tightening the cap
screws (key 21) and hex nuts (key 22) to 18 to
21 ft-lbs / 24 to 28 N•m of torque. To adjust the
outlet pressure to the desired setting, refer to the
Startup and Adjustment section.
18. Install a replacement closing cap gasket (key 35)
if necessary, and then install the closing cap
(key 3, if required).
19. Connect the downstream control line and refer
to the Startup section before putting the regulator
back in operation.
For the Steel or Stainless Steel lower casing
version only:
Key numbers are referenced in Figures 3 and 5.
1. Remove the downstream external control line.
Remove the closing cap (key 3, if required), and
turn the adjusting screw (key 2) counterclockwise
to remove the adjusting screw (key 2). Remove
the upper spring seat (key 4 or 44) and the control
spring (key 1).