Operation & Maintenance Instruction
Page 12 of 24
August, 2003
4225-50, S.6
7.4.6
Remove the four
1
/
2
" x 1
3
/
4
" hex head screws (1)
which secure the top cover (2) to the body (58). Remove the
cover (2).
7.4.7
Remove and SCRAP the ring gaskets (22, 23, 24)
from the top cover (2).
NOTE:
The thimble type air strainer (21) can be removed by
first removing the retaining ring (20) from the body (58).
7.4.8
Remove the emergency accelerated release check
valve spring (17), check valve spring seat (18), emergency
accelerated release check valve (19), retaining ring (20), and
the thimble type air strainer (21) from the body (58). SCRAP
the check valve (19).
7.4.9
Remove the high pressure spool valve return spring
(13) and the high pressure spool valve with o-rings (16, 15)
from the body (58).
NOTE:
For easier removal, thread a
3
/
8
-16 cap screw into
the high pressure spool.
7.4.10 Remove and SCRAP the five 1
3
/
16
" O.D. o-rings (15)
from the high pressure valve (16).
7.4.11 Carefully remove the emergency diaphragm piston
assembly (3 to 12) as a unit from the body (58).
7.4.12 Carefully drift the
3
/
32
" x
3
/
4
" cylindrical spring pin (6)
from the emergency slide valve (8). Remove the emergency
slide valve (8), filter (9), and spring (7) from the emergency
piston (10).
7.4.13 Remove the
5
/
8
" x 1" hex head cap screw (3) that
secures the diaphragm follower (4) and diaphragm (5) to the
emergency piston (10). Remove follower (4) and diaphragm
(5) from the piston (10). SCRAP the diaphragm (5).
7.4.14 Remove and SCRAP the two emergency wear rings
(11 and 12) from the emergency piston (10).
7.4.15 Vent Valve, Inshot Piston, Emergency Accelerated
Release Spool
7.4.16 Remove the two
1
/
2
x 1
1
/
8
hex head cap screws (31)
and the
1
/
2
x 1
3
/
4
hex head cap screw (32) that secures the
vent valve cover (33) to the body (58).
7.4.17 Remove the inshot piston spring (38) and the inshot
piston assembly (39 to 43) from the body (58).
7.4.18 Remove and SCRAP the
15
/
16
" O.D. ring gasket (34)
and the
5
/
8
" O.D. ring gasket (35) from the vent valve cover
(33).
7.4.19 Remove and SCRAP the
3
/
8
" O.D. o-ring (40) from
the inshot piston (41).
7.4.20 Use the inshot piston spanner wrench, as shown in
Figure 9, to hold the inshot piston (43), then remove the
3
/
8
"
self-locking hex nut (39) from the piston (43). SCRAP the
nut (39).
7.4.21 Remove the diaphragm follower (40) and diaphragm
(41) from the piston (43). SCRAP the diaphragm (41).
7.4.22 Remove the vent valve piston diaphragm (36) and
the vent valve piston (37) from the body (58). SCRAP the
diaphragm (36).
WARNING:
The cap nut (45) is under spring load.
Exercise care so that no parts are inadvertently expelled
from the assembly. Inadvertently expelled parts may cause
bodily injury.
7.4.23 Using a
7
/
8
" square wrench, remove the cap nut with
o-ring (45, 44), which secures the emergency accelerated
release spool valve spring (46) and emergency accelerated
release spool valve (48) with o-rings (47) in the body (58).
7.4.24 Remove the emergency accelerated release spool
valve spring (46) and emergency accelerated release spool
valve (48) with o-rings (47) from the bottom of the body (56).
7.4.25 Remove and SCRAP the four 1
1
/
2
" O.D. o-rings (47)
from the spool valve (48).
7.4.26 Remove and SCRAP the 1
1
/
2
" O.D. o-ring (44) from
the cap nut (45).
7.5
ASSEMBLY of ABDX-SS EMERGENCY PORTION
See Figure 12
7.5.1
Emergency Diaphragm Piston, High Pressure Spool,
Emergency Accelerated Release Check Valve
