(key 8) and the control spring (key 9). If used,
remove the diaphragm limiter (key 10) and inspect
the diaphragm limiter O-ring (key 23). Replace
if necessary.
3. Remove the diaphragm assembly (key 7) and
inspect the diaphragm.
4. On Types 161EBM and 161EBHM pilots, inspect
the stem guide seal assembly (key 19) and, if
damaged, replace the complete assembly. Inspect
the outer O-ring (key 22) and replace if necessary.
5. Install the diaphragm assembly (key 7) and push
down on it to see if the valve plug (key 4) strokes
smoothly and approximately 1/16 in. / 1.6 mm.
Note
In step 6, if installing a control spring
with a different range, be sure to replace
the spring range indicated on the
spring case with the new spring range.
A diaphragm limiter (key 10) and other
listed parts are required with the highest
spring range.
6. Stack the control spring (key 9), the control spring
seat (key 8), if used and the diaphragm limiter
(key 10) onto the diaphragm assembly (key 7).
Make sure that, if used, the diaphragm limiter
is installed bevelled side up. Sparingly apply
lubricant to the control spring seat.
7. Install the spring case (key 2) on the body
(key 1) with the vent (key 18) oriented to allow
for wrenches, needed for connecting outlet
piping and to prevent clogging or entrance of
moisture. Install the machine screws (key 13)
and, using a crisscross pattern torque them to
5 to 7 ft-lbs / 6.8 to 9.4 N•m for stainless steel
constructions and 2 to 3 ft-lbs / 2.7 to 4.1 N•m for
aluminum constructions.
Note
Spring case vent may be mounted in
any orientation convenient to your
application, but plastic vent (key 18)
should be oriented downward.
8. When all maintenance is complete, refer to the
Startup and Adjustment section to put the regulator
back into operation and adjust the pressure
setting. Tighten the locknut (key 12), replace the
closing cap gasket (key 17) if necessary and install
the closing cap (key 16).
161AY Series Pilots (Figure 7)
Body Area
Use this procedure to gain 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.
1. Remove the cap screws (key 2) and separate the
diaphragm casing (key 4) from the body (key 1).
2. Remove body seal O-ring (key 11) and the backup
ring (key 50). Inspect the body seal O-ring and
replace if necessary.
3.
Inspect and replace the orifice (key 5) if necessary.
Lubricate the threads of the replacement orifice
with a good grade of light grease and install with
29 to 37 ft-lbs / 39 to 50 N•m of torque.
4. On Types 161AY and 161AYM, remove the
cotter pin (key 15) if it is necessary to replace the
disk assembly (key 13) or the throat seal O-ring
(key 31) of a Type 161AYM. On a Type 161AYW,
to replace the disk assembly (key 13), bleed
assembly (key 57), O-ring (key 53), washer
(key 51) or spring (key 52), remove the groove
pin (key 54).
5. For a Type 161AYM inspect the throat seal O-ring
(key 31) and remove the machine screw (key 33).
Replace O-ring if necessary.
6. On Types 161AY and 161AYM, install the disk
assembly (key 13) and secure it with the cotter
pin (key 15). On a Type 161AYW, install the
bleed assembly (key 57), washer (key 51), O-ring
(key 53) and spring (key 52) prior to installing the
disk assembly (key 13) and securing it with the
groove pin (key 54).
7. Place backup ring (key 50) into the body (key 1)
then place the body seal O-ring (key 11) into
the body.
8. Place the diaphragm casing (key 4) on the body
(key 1). Secure the diaphragm casing to the body
with the cap screws (key 2).
Diaphragm and Spring Case Area
Use this procedure to change the control spring and
to inspect, clean or replace part in the spring case and
diaphragm assembly.
To Change the Control Spring:
1. Remove the closing cap (key 22) and turn the
adjusting screw (key 35) counterclockwise until
all compression is removed from the control
spring (key 6).
6
161 Series
