Type ACE97
16
3. Thread the poppet (key 42) onto the piston (key 37).
Use soft-jawed pliers to restrain the piston so it is
not damaged. Do not hold the poppet by the stem.
Insert a small drill bit into the cross-drilled hole on
the poppet stem (key 42) to turn and tighten.
4. Slide the O-ring (key 39) onto the poppet (key 42).
5. Place the pilot sub-assembly into the upper
cage (key 40).
6. Press the lower cage (key 35) and upper cage
(key 40) together to ensure the groove in the lower
cage engages the rolling diaphragm (key 38) bead.
Note
Ensure that the rolling diaphragm bead
is positioned so that it sits in the groove
of the lower cage (See Figure 9). If it
does not, the rolling diaphragm was
installed upside down in step 2.
7. Remove the lower cage (key 35).
8. Lubricate the piston (key 37) and lower cage (key 35)
groove with Dow Corning
®
#111.
9. Install the pilot spring (key 36) into the piston
(key 37) and re-install the lower cage (key 35).
10. Hold the pilot/cage sub-assembly together and
insert it into the bonnet (key 17). Press rmly
(the bonnet O-rings will offer resistance).
11. Press the poppet (key 42) stem. It should
freely move up and down. If it does not, repeat
the procedure to this point to determine the cause.
Pad Valve Assembly (NPS 1/2 / DN 15 valve)
Refer to Figure 13.
1. Install O-rings (key 16) into the body (key 18).
2. Place the spring (key 36) into the body (key 18) cavity.
3. Insert the cage (key 52) and valve sub-assembly
into the body (key 18) cavity.
4. Press the body (key 18) and cage (key 52) together
to engage the rolling diaphragm bead into the groove.
Note
Ensure that the rolling diaphragm bead
is positioned so that it sits in the groove
of the body (see Figure 14). If it does
not, the rolling diaphragm was installed
upside down in step 1 of the Pad Valve
Cage Assembly (NPS 1/2 / DN 15 valve).
5. Press and release the poppet (key 42) stem. It
should freely move up and down. If it does not,
repeat the procedure to this point to determine
the cause.
6. Place the O-ring (key 41) onto the cage (key 52).
Pad Valve Assembly (NPS 1 and 2 / DN 25
and 50 valve)
Refer to Figures 14 and 15.
1. Prepare the main piston (key 25) by installing
the plug (key 22) and O-ring (key 23) with the
screw and lock washer (keys 20 and 21). Apply
Loctite
®
#222 to the screw threads.
2. Install the main valve spring (key 26), spring
shim (key 34, if required), and spring guide (key 49,
if required) into the piston (key 25).
3. Place the valve sub-assembly (piston (key 25),
spring (key 26), and plug (key 22)) into the body
(key 18).
4. Place an O-ring (key 19) into the body (key 18).
5. Place the bonnet (key 17) onto the body (key 18)
and main valve (key 25).
6. Press rmly to seat the bonnet O-ring joint. If you
are performing assembly operations on a
NPS 2 / DN 50 valve, attach the bonnet (key 17)
to the body (key 18) with four cap screws and lock
washers (keys 51 and 52).
Figure 10. NPS 2 / DN 50 Pad Valve Piston and Spring
W8160
PISTON (MAIN VALVE)
SPRING (KEY 26)
O-RING
(KEY 24)
PISTON (MAIN)
(KEY 25)
O-RING
(KEY 23)
PLUG
(KEY 22)
LOCK WASHER
(KEY 21)
SCREW
(KEY 20)
(20 páginas)
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