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NPS 1 through 3 / DN 25 through 80
Actuator Assembly Maintenance
(Refer to Figure 4)
1. Make a mark on the upper actuator casing (key 11), lower
actuator casing (key 5), intermediate flange (key 25),
and body (key 1) to indicate proper alignment when
reassembling the product.
2. Remove travel indicator assembly (keys 138, 139, 140,
141, 142B, 143, 144, 145, 160, and 192), if present, by
loosening the travel indicator fitting (key 141) and lifting
out the travel indicator assembly.
3. Loosen out the hex nuts (key 23) and remove the
washers (key 22) and the cap screws (key 21). Remove
all the short bolts first, then evenly remove the two long
bolts (key 39), indicated with (LB) on the head and
brackets (key 35). Make sure to balance the upper
actuator casing while removing the spring tension.
Carefully lift the upper actuator casing (key 11) off the
lower actuator casing (key 5). Remove spring (key 13).
4. Remove the socket head cap screws (key 16). Lift off the
diaphragm (key 20) and the inlet plate (key 18). Remove
O-rings (keys 15 and 17). Inspect the diaphragm and
O-rings for damage and wear, and replace if necessary.
5. Inspect the upper actuator casing (key 11), O-ring (key 9),
anti-friction split rings (key 8), and anti-friction ring (key 4)
for damage or wear. If damage, remove the O-ring and
split rings, and replace with new parts. Lightly lubricate
the O-ring and split rings. Place the split rings in the
body first, then slide the O-ring between the split rings.
Lubricate and reinstall the anti-friction ring (key 4).
6. Remove hex nuts (key 26) from the stud bolts (key 24).
Lift off the lower actuator casing (key 5). Remove the
hex socket cap screws (key 33) and spring lock washers
(key 32). Lift off the disk holder assembly (key 30) and
disk retainer (key 31).
7. Slide the sleeve (key 14) out of the lower actuator casing
(key 5) and slide the outlet plate (key 19) off the sleeve.
Check the sleeve for scratches, burrs, or other damage,
and replace if necessary.
8. Inspect the lower actuator casing (key 5), O-rings (keys 9
and 62), anti-friction split rings (key 8), and anti-friction
rings (key 4) for damage or wear. If damaged, remove the
O-ring and split rings, and replace with new parts. Lightly
lubricate the O-ring body first, then slide the O-ring (key 9)
between the split rings. Lubricate and mount O-ring
(key 62) outside of the lower actuator casing (key 5).
9. Slide the outlet plate (key 19) onto the sleeve (key 14)
and slide the sleeve into the lower actuator casing
(key 5). Place the disk holder (key 30) and disk retainer
(key 31) on the sleeve adaptor (key 27). Insert the
spring lock washers (key 32) and hex socket cap screws
(key 33) and tighten. See Torque Specifications (Table 3)
for proper torque values.
Type EZH Relief or Backpressure Regulator
10. Lightly lubricate the O-rings (keys 15 and 17) and the
inner and outer diaphragm (key 20) edges. Place the
inlet plate (key 18) and the diaphragm (key 20) on the
sleeve (key 14). Make sure O-rings (keys 15 and 17)
are correctly positioned. Insert and tighten the hex
socket cap screws (key 16). See Torque Specifications
(Table 3) for proper torque values.
When tightening cap screws (key 21) arranged
in a circular pattern, alternate the tightening of
each fastener with the fastener directly across
from it using a "star" crisscross pattern
for five times, until proper specified torque
is achieved. Each time around, when all
screws are tightened to the required torque,
the diaphragm will compress a little until the
plates are in direct, metal-to-metal, contact. It
will take at least five times around before this
happens. Only then will the applied torque on
each screw remain at the required value.
11. Carefully lift the lower actuator casing assembly (key 5)
and place on the body (key 1). Make sure to match up
the alignment marks. Secure with stud bolts and nuts
(keys 24 and 26). See Torque Specifications (Table 3)
for proper torque values.
12. Lightly lubricate the spring (key 13) and place on the
inlet plate (key 18).
13. Carefully place the upper actuator casing (key 11) on
the lower actuator casing (key 5). Make sure to match
up the alignment marks. Insert the two long bolts
(key 39) 180° apart and away from flanges. Place
the washers (key 22), hex nuts (key 23), and brackets
(key 35) on the long bolts and evenly tighten. Using
proper bolting techniques, install remaining short
bolts (key 21), washers and hex nuts. See Torque
Specifications (Table 3) for proper torque values.
14. Place travel indicator assembly (keys 138, 139, 140,
141, 142B, 143, 144, 145, 160, and 192) in the upper
actuator casing (key 11), if present, and tighten the
travel indicator fitting (key 141).
NPS 4 / DN 100 Actuator Assembly Maintenance
(Refer to Figure 4)
1. If present, remove the travel indicator assembly by
unscrewing the travel indicator fitting (key 141), then pull
out the stem (key 139).
2. Remove hex head cap screws (key 21), washers
(key 22), and hex nuts (key 23). Carefully lift the upper
actuator casing (key 11) off the lower actuator casing
(key 5). Inspect the upper actuator casing (key 11),
O-rings (key 9) and anti-friction rings (key 8) for damage
or wear. If damaged, remove and replace with new
parts. Place the anti-friction rings in the body first, then
slide the O-ring between the anti-friction rings.
Note
9
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