Emerson Fisher 161AY Series Instruction Manual page 20

Type EZR
9. Check the indicator fitting O-ring (key 6). Lubricate
and replace if necessary.
10. To replace travel indicator parts, lubricate
all O-rings, back-up rings and threads. To
reassemble, hold the indicator stem (key 15) and
place the parts on the stem in the following order
(see Figure 10).
• Washer (key 79 for NPS 6 / DN 150 size only)
• Main Spring (key 12), small end first
• Upper Spring Seat (key 17), make sure to place
the large end toward the spring
• First Back-up Ring (key 16)
• O-ring (key 18)
• Second Back-up Ring (key 16)
• Indicator Fitting (key 19), the back-up rings
(key 16) and O-ring (key 18) should slide into
the indicator fitting and the small end of the
upper spring seat (key 17) should slide into the
indicator fitting.
• First Hex Nut (key 4)
• Indicator Washer (key 20)
• Second Hex Nut (key 4)
11. Install the indicator fitting (key 19) into the bonnet
(key 2, Figure 14), tighten to the proper torque (see
Table 13).
To set the travel indicator, hold the indicator cover
(key 21) next to the indicator fitting (key 19).
Screw the hex nuts (key 4) and the indicator
washer (key 20) down on the indicator stem
(key 15) until the washer is even with the lowest
marking on the indicator cover. Lightly lubricate
the indicator cover threads and install. Replace the
indicator protector (key 22).
To replace the travel indicator with the non-travel
indicator option, place the main spring (key 12) into
the bonnet. Install the indicator plug (key 19) and
tighten to proper torque (see Table 13).
161EB Series Pilots (Figure 19)
This procedure covers all 161EB Series
pilots. Types 161EB and 161EBM rated
for outlet pressure settings over
200 psig / 13.8 bar require a diaphragm
limiter. Types 161EB and 161EBM pilots
rated for outlet pressure settings under
200 psig / 13.8 bar do not require a
diaphragm limiter.
20
Note
Figure 11. 161EB Series Pilot Trim Removal/Installation
Trim Parts
1. As shown in Figure 11, remove the body plug
(key 3) to let the plug spring (key 6) and valve plug
(key 4) drop freely from the body.
2. Inspect the removed parts and body plug O-ring
(key 15), replace as necessary and make sure the
plug seating surfaces are free from debris.
3. Sparingly apply lubricant to the body plug O-ring
(key 15) and the threads of the body plug (key 3).
Install the body plug O-ring over the body plug.
4. Stack the plug spring (key 6) and valve plug
(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
locknut (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, not shown)
and separate the spring case (key 2) from the
body (key 1). Remove the control spring seat
(key 8), 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.