Type 399A-161-112
24
(key 15) with Lubriplate lubricant or equivalent and
install it on the valve stem (key 13).
6. Install the valve stem (key 13) into the lower casing
assembly (key 20) and perform trim parts mainte-
nance procedure steps 5 through 10 as necessary.
7. Install the lever assembly (key 9) into the valve
stem (key 13) and secure the lever assembly (key 9)
with the machine screws (key 11).
Note
The diaphragm parts installed in the fol-
lowing step must be matched to the
control spring (key 1) that will be
installed in step 11. Be sure to check
that the part numbers of the diaphragm
or diaphragm assembly (key 5) and re-
lief valve spring (key 67) match the con-
trol spring (key 1) part number as given
in the parts list.
8. Coat the diaphragm gasket surface with a good
grade of adhesive gasket sealer and install the dia-
phragm gasket (key 78).
9. Coat the relief valve spring holder (key 30) with a
good grade of adhesive gasket sealer and install on it
the relief valve spring (key 67) and diaphragm assem-
bly (key 5), plus the relief valve guide (key 34, not
shown) if the stainless steel construction is used. Se-
cure the relief valve seat (key 33) to the relief valve
spring holder with 30 to 45 foot-pounds (41 to 61 Nm)
of torque.
10. Install the pusher post (key 8) or relief valve seat
(key 33) plus attached diaphragm parts onto the lever
assembly (key 9).
11. Install the spring case (key 23) and control spring
(key 1) on the diaphragm case assembly (key 20) so
that the vent assembly (key 65) is correctly oriented,
and start the hex nuts (key 22, not shown) on the cap
screws (key 21).
12. Turn the adjusting screw (key 2) clockwise until
there is enough control spring (key 1) force to provide
proper slack to the diaphragm or diaphragm assembly
(key 5). Using a crisscross pattern, finish tightening
the cap screws (key 21) and hex nuts (key 22, not
shown) to 8 to 9 foot-pounds (10 to 12 Nm)of torque
for stainless steel or 2 to 4 foot-pounds (3 to 5 Nm)of
torque for aluminum.
13. Install a replacement closing cap gasket (key 35),
if necessary, and then install the closing cap (key 3).
Type 161H, 161HM, 161EBH or 161EBHM
Pilot
Key numbers are referenced in figure 21 unless other-
wise noted.
Trim Parts
1. As shown in figure 15, remove the body plug (key 3)
to let the plug spring (key 6), and plug/stem assembly
(key 4) drop freely from the body on the Type 161H
and 161EBH only. On the Type 161HM and 161EBHM
pilots, use needle nose pliers to remove the plug/stem
assembly.
2. Inspect the removed parts and body plug Oring
(key 15), replace as necessary, and make sure the
plug seating surfaces are free from debris.
3. Sparingly apply lubricant to the body plug Oring
(key 15) and the threads of the body plug (key 3).
Install the body plug O-ring over the body plug.
4. As shown in figure 15, stack the plug spring (key 6),
and plug/stem assembly (key 4) on the body plug (key
3). Install the body plug with stacked parts into the
body (key 1).
Diaphragm Parts
1. Remove the closing cap (key 16), loosen the lock-
nut (key 12), and back out the adjusting screw (key
11) until compression is removed from the control
spring (key 9).
2. Remove the machine screws (key 13) and separate
the spring case (key 2) from the body assembly (key
1). Remove the control spring seat (key 8), the control
spring (key 9), and the diaphragm limiter (key 10). In-
spect the diaphragm limiter O-ring (key 23) and re-
place if necessary.
3. Remove the diaphragm assembly (key 7) and in-
spect the diaphragm.
4. To gain access to the stem guide seal O-ring of
Type 161M, 161HM, 161EBM and 161EBHM pilots,
remove and inspect the stem guide seal assembly
(key 19), and if damaged replace the complete assem-
bly. Inspect the outer Oring (key 22) and replace if
necessary.
5. Install the diaphragm assembly (key 7) and push
down on it to see if the plug/stem assembly (key 4)
strokes smoothly and approximately 1/16-inch (2 mm).
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