Upper Case Maintenance; Damper And Restrictor Maintenance - Fisher EZR Instruction Manual

Type EZR
W4573
Figure 13. Pushing Groove Valve Up With Retainer
3. Use a wrench to hold the stem (key 23) and
loosen the stem nut (key 20). Remove the stem
nut and washer (key 11).
4. Remove the diaphragm plate (key 13), diaphragm
(key 14), pad holder (key 22), and O-ring (key 18).
Inspect parts for damage or wear, and replace
if necessary.
5. Remove orifice (key 19) and O-ring (key 17).
Inspect the parts for damage or wear, and replace
if necessary. Lightly lubricate the O-ring and
place in the body (key 16). Install the orifice.
6. Set the pad holder (key 22) in the body (key 16).
7. Lightly lubricate the rims of the diaphragm
(key 14) and place it on top of the pad holder
(key 22). Set the diaphragm plate (key 13) on the
diaphragm (key 14).
8. Lightly lubricate the O-ring (key 18) and place it in
the lower case (key 21).
9. Place the washer (key 11) and stem nut
(key 20) on the stem (key 23) and tighten. If also
performing Upper Case Maintenance, skip to
step 2 of the Upper Case Maintenance section.
10. Insert machine screws (key 10) in the lower cover
(key 21) and tighten uniformly to ensure proper seal.

Upper Case Maintenance

1. Remove pressure from the pilot.
2. Loosen locknut (key 2) and back out adjusting
screw (key 1) until compression is removed from
the spring. Remove cap (key 3).
3. Lift the spring carrier (key 6), spring (key 7), and
O-ring (key 4) out of the upper cover (key 8).
Inspect O-ring and replace if necessary.
4. Remove machine screws (key 10) from lower
cover (key 21) and the separate lower cover
22
from the body (key 16), unless removed during
lower diaphragm maintenance. Use a wrench
to hold stem (key 23) securely while removing the
stem nut (key 26).
5. Remove remaining loose components: washer
(key 11), upper diaphragm plate (key 13),
diaphragm (key 14), lower diaphragm plate
(key 15), and O-rings (keys 18 and 25). Inspect
diaphragm and O-rings for damage or wear, and
replace if necessary.
6. Lightly lubricate the O-ring (key 25). Place O-ring
over the stem (key 23) and press it down into the
body (key 16).
7. Set the lower diaphragm plate (key 15) into the
body (key 16).
8. Lightly lubricate the rims of the diaphragm (key 14)
and place it in the body (key 16) on top of the
lower diaphragm plate (key 15).
9. Set the upper diaphragm plate (key 13) on top of
the diaphragm (key 14).
10. Place washer (key 11) and stem nut (key 26)
on the stem (key 23) and tighten using a wrench
to hold the stem.
11. Set the spring carrier (key 6).

Damper and Restrictor Maintenance

1. Remove screw (key 31, Figure 27) and plate
(key 29).
2. Remove ring nuts (key 30).
3. Remove damper adjusting screw (key 27).
Remove and inspect O-ring (key 28) for damage
or wear, and replace if necessary. Lightly
lubricate O-ring before placing on the
adjusting screw. Insert damper adjusting screw
into the body (key 16) and tighten. Insert ring
nut (key 30) and tighten. Back out damper
adjusting screw until it stops.
4. Remove restrictor adjusting screw with hole
(key 32). Remove and inspect O-ring (key 28)
for damage or wear, and replace if
necessary. Lightly lubricate O-ring before
placing on the adjusting screw. Insert restrictor
adjusting screw into the body (key 16) and
completely tighten. Insert ring nut (key 30) and
completely tighten. Back out restrictor adjusting
screw 1/2 turn.