Manual

7
IOM-5200
d. Straighten the bent ends of cotter pin
(62) and remove pin from support plate
(40). Slide pallet (4) assembly out of tube
end.
e. Inspect and clean seat ring (3). Check
seat surface for any nicks, corrosion, pit-
ting or product build up. Seat surface must
be clean and smooth for vent to perform
properly. (continue with step i. unless
changing gasket (49)).
To Remove Adapter Gasket: steps (f - h).
f. Paint or embed a match mark between
cover (17) and lower case adapter assy
(32).
g. Loosen and remove adapter bolts (38)
and washers (39). Lift cover (17) up and
over support plate (40). Remove and re-
place adapter gasket (49).
h. Re-install cover (17) and align match
mark from f. above. Install lock washers
(39) and adapter bolts (38). Tighten se-
curely.
i. Carefully secure stem (10) in a vise,
oriented such that the pallet (4) assembly
is directed upwards.
j. Remove cotter pin (61), nut (23), lock
washer (19), washer (24), diaphragm re-
tainer plate (6), diaphragm (5) and pallet
(4) from stem (10).
k. Re-install pallet (4) on stem (10).
NOTE: Apply small amount of TFE paste
around the center opening (top surface) of
the pallet (4).
l. Place a new diaphragm (5) on the pal-
let (4). NOTE: Apply small amount of TFE
paste around the center opening (top sur-
face) of the diaphragm (5).
m. Install the diaphragm retainer plate
(6), washer (24), lock washer (19) and nut
(23). Secure nut tight to lock washer (19).
n. Push cotter pin (61) into hole in stem
(10) and secure. (continue with step v. un-
less changing gasket (13)).
To Remove Seat Ring/Gasket: steps (o - q).
o. Rotate bolts (11) CCW and remove.
Place a wrench on the milled  ats of the pal-
let guides (16), rotate CCW to remove the
guides (16) and stud spacers (69) - Mark
the location of guides on the seat ring (3) for
reference at re-assembly.
p. Lift up to remove seat ring (3) and gas-
ket (13). Inspect guides (16) and inside
of the body cavity (1) for any corrosion or
product build-up. Clean if necessary.
q. Apply TFE paste to both sides of new
gasket and install in pipeaway body(20).
To Remove Lower Gasket: steps (r - u).
r. Paint or embed a match mark between
pipeaway body (20) and lower body (1).
s. Separate pipeaway body (20) from
body (1). Remove lower gasket (13) and
clean sealing surfaces of both parts.
t. Apply TFE paste to both sides of new
gasket (13) and install on body (1)
u. Align match marks of r. previous to in-
stall pipeaway body (20). Install seat ring
(3), bolts (11), guides (16) and spacers (69).
Tighten bolts (11) and supports (16) to 15 ft.
lbs.
v. Slide pallet (4) assembly back into the
end of tube of support plate (40). Push cot-
ter pin (62) through hole in support plate (40
and secure.
w. Re-assemble vent in reverse order In-
stall pilot body assembly on nipple (53) tight
with CW rotation. Ensure straight connec-
tor (244) of the pilot valve assembly is di-
rectly above sensing tube connector (48) of
the main valve assembly.
x. Reconnect tubing (243) to  ttings
(232), (234) and tubing (57) to  ttings
(48),(244).
CAUTION
The pipeaway body (20) is no longer fastened securely
to the body (1) and could fall and cause severe per-
sonal injury and material damage.