Type 399A-161-112
4
6. To replace the lever assembly (key 16), remove the machine screws (key 17). To replace the stem (key 14) or
access the stem seal O-ring (key 30) also perform Body Area Maintenance procedure steps 1 and 4, and pull the
stem out of the diaphragm casing (key 4).
7. Install the stem (key 14) into the diaphragm casing (key 4) and perform Body Area Maintenance procedure
steps 6 through 8 as necessary.
8. Install the lever assembly (key 16) into the stem (key 14) and secure the lever assembly with the machine
screws (key 17).
9. Install the parts on the pusher post (key 8) in the order listed below:
• Pusher Post (key 8)
• Pusher Post Connector (key 40)
• Connector Seal O-Ring (key 49)
• Diaphragm Head (key 7)
• Diaphragm (key 10), pattern side up
• Diaphragm Head (key 7)
• Hex Nut (key 21) — Torque the hex nut 9 to 11 foot-pounds (12 to 15 N•m) to secure parts to the pusher
post connector (key 40)
• Overpressure Spring (key 39)
• Spring Holder (key 37)
• Machine Screw (key 38)
10. Insert and tighten the machine screw (key 38) with a torque of 1 to 3 foot-pounds (1 to 4 N•m) to secure the
diaphragm parts to the pusher post (key 8).
11. Install the assembled parts in the diaphragm casing (key 4). Make sure that the lever (key 16) fits in the
pusher post (key 8) and that the holes in the diaphragm align with the holes in the diaphragm casing.
12. Place the spring case (key 3) on the diaphragm casing (key 4) so that the vent assembly (key 26) is correctly
oriented, and secure with the cap screws (key 24) and hex nuts (key 23, not shown) fingertight only.
13. Insert the control spring (key 6) into the spring case (key 3), followed by the baffle plate (key 56) and adjusting
screw (key 35).
14. Turn the adjusting screw (key 35) clockwise until there is enough control spring (key 6) force to provide proper
slack to the diaphragm (key 10). Using a criss-cross pattern, finish tightening the cap screws (key 24) and hex nuts
(key 23, not shown) to 14 to 17 foot-pounds (19 to 23 N•m) of torque. To adjust the outlet pressure to the desired setting,
refer to Startup and Adjustment in the Instruction Manual.
15. Install a replacement closing cap gasket (key 25) if necessary, and then install the closing cap (key 22).
To Convert Constructions
The Type 161AY to the Type 161AYM:
New parts required: Keys 30, 31 and 33
1. Remove the pipe plug (key 27) from the diaphragm casing (key 4).
2. Refer to steps 1 and 4 in the Body Area Maintenance section of this errata sheet to remove the disk assembly
(key 13).
3. Insert the throat seal O-ring (key 31, figure 23) and one machine screw (key 33).
4. Insert the stem seal O-ring (key 30) by following steps 1 through 3, and 6 through 8 in the Disassemble/Reas-
semble section of Diaphragm and Spring Case Area Maintenance of this errata sheet. Reassemble by following the
appropriate steps.
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