Prx Series Maintenance; Lower Case Maintenance - Fisher EZR Instruction Manual

Pressure reducing regulator with 161ay, 161eb series pilot and type 112 restrictor

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Instruction manual (20 pages)

Table Of Contents

Table of Contents

4. Install the replacement closing cap gasket (key 25)

if necessary and reinstall the closing cap (key 22).

5. If the spring was changed, be sure to change the

stamped spring range on the nameplate.

To Disassemble and Reassemble Diaphragm Parts

1. Remove the closing cap (key 22), and turn adjusting

screw (key 35) counterclockwise to remove adjusting

screw, baffle plate (key 56), and control spring (key 6).

2. Remove the spring case hex nuts (key 23, not

shown), cap screws (key 24), and spring case (key 3).

3. Remove the diaphragm (key 10) and attached

parts by tilting them so that the pusher post (key 8)

slips off the lever assembly (key 16). To separate

the diaphragm (key 10) from the attached parts,

unscrew the machine screw (key 38) from the

pusher post (key 8).

4. Inspect the pusher post (key 8) and the body seal

O-ring (key 11), replace if required.

5. Remove hex nut (key 21) to separate the

diaphragm (key 10) and attached parts.

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 guide insert (key 18)

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 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) — Tighten 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 (1,4 to

4,1 N•m) to secure the diaphragm parts to

the pusher post (key 8).

Figure 12. Expanded View of the Body Area

Showing the O-ring and Back-up Ring Placement

11. Install the assembled parts in the diaphragm

casing (key 4). Make sure the lever (key 16)

fits in the pusher post (key 8) and that the holes

in the diaphragm (key 10) align with the holes in

the diaphragm casing.

12. Place the spring case (key 3) on the diaphragm

casing (key 4) so the vent assembly (key 26)

is oriented correctly, 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 spring (key 6) force to provide

proper slack to the diaphragm (key 10). Using

a crisscross pattern, tighten 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 section.

15. Install a replacement closing cap gasket (key 25)

if necessary, and then install the closing cap (key 22).