Instruction manual

Type ACE97
14
5. Remove the plug (key 22) from the main valve.
6. Insert wooden dowel rod (or similar blunt tool)
through the bottom of the bonnet bore to remove
the cage sub-assembly (keys 35 and 40).
Pad Valve Cage Disassembly (NPS 1/2
/ DN 15 valve)
Refer to Figures 8 and 13.
1. Remove the cage (key 52) from the body (key 18)
by slowly applying shop air (approximately 20 psig
/ 1,4 bar) at the inlet of the body. Use your hand
to safely catch the cage as it is removed from the
body. See Figure 8.
2. Remove the pilot valve from the cage (key 52) by
pressing on the poppet (key 42) stem.
Use soft-jaws to restrain the piston (key 37)
without damaging it. Do not hold the
poppet (key 42) by the stem.
3. To unscrew the piston (key 37) from the poppet
(key 42), insert a small drill bit into the cross-drilled
holes on the poppet to turn and loosen. Unthread
the poppet from the piston and remove the rolling
diaphragm (key 38).
Pad Pilot Valve/Cage Disassembly (NPS 1
and 2 / DN 25 and 50 valves)
Refer to Figures 9, 14, and 15.
1. The upper cage (key 40) will readily separate from
the lower cage (key 35). See Figure 9.
2. Gently press the poppet stem (key 42) to remove
the pilot from the upper cage (key 40).
CAUTION
Use soft-jaws to restrain the piston
(key 37) without damaging it. Do not
hold the poppet (key 42) by the stem.
3. To unscrew the piston (key 37) from the poppet
(key 42), insert a small drill bit into the
cross-drilled holes on the poppet to turn and
loosen. Unthread the poppet from the piston
and remove the rolling diaphragm (key 38).
Depad Main Valve Disassembly
Refer to Figures 16, 17, and 18.
1. Remove the tubing (key 143) from the end of the
bonnet (key 87).
2. For 1 NPT Main Valve: Unthread the bonnet
(key 87) from the depad valve body (key 91).
Remove the retaining ring (key 89), cap (key 90),
and O-ring (key 88).
For 2 NPT and NPS 3 and 4 / DN 80 and 100
Main Valves: Unthread the ange bolts (key 160)
and washer (key 161). Remove the bonnet
(key 87) from the depad valve body (key 91).
3. Gently remove the internal components by lifting
the depad main valve stem (key 75).
CAUTION
When working with the main valve stem
sub-assembly, take care not to scratch
the coated surface (the surface that
operates in contact with the seal (key 81)).
Refer to Figure 16, 17, or 18.
4. Hold the main valve stem (key 75) on its at sides
in a soft-jawed vise. Apply enough pressure to
keep the main valve stem from turning.
5. Remove the cap screw (key 78), lock washer
(key 79), and cage (key 77).
6. Separate the cage (key 77) and seat O-ring (key 76)
from the main valve stem (key 75).
CAUTION
The main valve return spring (key 84) is
compressed and could cause damage or
injury. Remove this spring with care.
7. For 1 and 2 NPT Main Valves: Remove
spring guide (key 85) by removing the retaining
ring (key 86).
For NPS 3 and 4 / DN 80 and 100 Main Valves:
Remove the spring guide (key 82), tap bolt
(key 126), and lock washer (key 79).
8. Remove the spring (key 84) and seal retaining
plate (key 83).
9. Remove the O-rings (key 82) and the seal
retainer (key 80).
10. Remove the stem seal (key 81).