Emerson Fisher Accu-Pressure Y693 Instruction Manual page 5

Body area Maintenance Procedures
For the Aluminum lower casing version only:
Key numbers are referenced in Figure 4.
This procedure is for gaining access to the disk assembly,
orifice and body O-ring. All pressure must be released
from the regulator, before these steps can be performed.
1. Remove the cap screws (key 18) that hold the
lower casing assembly (key 9) to the body (key 28).
Separate the lower casing from the body.
2. Inspect and replace the orifice (key 27)
if necessary. Lubricate the threads of the
replacement orifice with a good grade of pipe
thread sealant. Install the orifice with 75 to
100 ft-lbs / 102 to 136 N•m of torque.
3. Inspect the disk (key 99) for nicks, cuts and
other damage. Unscrew the machine screw
(key 12) and replace the disk with a new part if
necessary. Install the new disk, disk washer and
machine screw (keys 99, 98 and 12) and tighten
to a torque of 1 to 2 ft-lbs / 1 to 3 N•m.
4. Inspect the bias spring (key 85) and disk holder
(key 25). Unscrew the disk holder (key 25) from the
valve stem (key 13) and replace the bias spring with
a new part, if necessary. Lubricate the disk holder
threads and carefully tighten to 5 to 7 ft-lbs /
7 to 9 N•m.
5. Inspect the body O-ring (key 16) for damage
and/or wear and replace if necessary.
6. Install the lower casing assembly (key 9) to the body
(key 28) with cap screws (key 18). Uniformly tighten
the two cap screws to a torque of 45 to 50 ft-lbs /
61 to 68 N•m.
For the Steel or Stainless Steel Lower
Casing Version Only:
Key numbers are referenced in Figure 5.
This procedure is for gaining access to the disk
assembly, orifice, body gasket and split ring. All
pressure must be released from the regulator, before
these steps can be performed.
1. Unscrew the union nut (key 19) from the body
(key 28) and remove the lower casing assembly
(key 20) and split ring (key 17).
2. Inspect and replace the orifice (key 27) if necessary.
Lubricate the threads of the replacement orifice with
a good grade of pipe thread sealant. Install the orifice
with 75 to 100 ft-lbs / 102 to 136 N•m of torque.
3. Inspect the disk (key 99) for nicks, cuts and other
damage. Unscrew the machine screw (key 12)
and replace the disk with a new part if necessary.
Install the new disk, disk washer and machine
screw (keys 99, 98 and 12), and hand tighten to a
torque of 1 to 2 ft-lbs / 1 to 3 N•m.
4. Inspect the bias spring (key 85) and disk holder
(key 25). Unscrew the disk holder (key 25) from
the valve stem (key 13) and replace the bias spring
with a new part, if necessary. Lubricate the disk
holder threads and carefully tighten to no more
than 5 to 7 ft-lbs / 7 to 9 N•m.
5. If necessary, install a replacement body gasket
(key 16) into the body (key 28).
6. 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.
7. Install the lower casing assembly (key 20) with the
attached split ring (key 17) and union nut (key 19)
to the body (key 28).
8. 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 stem. All pressure must
be released from the diaphragm case assembly before
these steps can be performed. Key numbers are
referenced in Figures 3, 4 and 5.
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 upper
spring seat (key 4 or 44). Change the control
spring to match the desired spring range.
3. Replace the upper spring seat and install the
adjusting screw (key 2).
4. Install a replacement closing cap gasket
(key 35), if necessary, and reinstall the closing
cap (key 3, if required).
5. If the spring range was changed, be sure to change
the stamped spring range on the nameplate.
Type Y693
5