Cashco 3600 - Manual (Page 4)

4 IOM-3600
Tank or system protection is the primary function
of the weight loaded Pressure and/or Vacuum
Relief Vent. As a safety device, it is very important
that maintenance/inspection be done on a regular
interval. Maintenance should only be done by a
qualifi ed technician. Valve Concepts recommends
that all service be performed at the factory or a
factory authorized repair center. For information on
repair centers in your area, please contact factory.
To Dis-assemble: Remove cover bolts (22), cover
(2) and cover gasket (12).
Inspect cover for corrosion, damage, or product
build up. Clean with a suitable solvent, replace as
necessary.
NOTE: During re-assembly, install new cover gasket
(12) (5/32-inch diameter Gortex rope joint sealant).
For FRP material - bolting (22) for cover (2) should
be torqued to 50 in. - lbs. (5.6 Nm).
Remove pallet (4) assembly, including any loading
weights (18) that may be on the pallets (4).
Clean and inspect pallet (4) assemblies. Inspect the
diaphragms (5) and replace if necessary.
To Replace Diaphragm: Place stem (10) in a vise
with threaded end up. Remove cotter pin (61), nut
(23), lock-washer (19) and washer (24).
Lift up to remove diaphragm plate (6) and diaphragm
(5). NOTE: Apply TFE paste to threads of the stem
and around hole on the pallets (4).
Install new diaphragm (5). Re-install diaphragm
plate (6), washer (24), lock-washer (19) and tighten
nut (23) on stem. Insert cotter pin (61) through hole
in stem and secure.
Inspect and clean seat ring (3). Check seat surface
for any nicks, corrosion, pitting or product build up.
Seat surfaces must be clean and smooth for vent to
perform properly.
To Remove Seat Ring/Gasket: Rotate bolts (11)
CCW and remove. Remove guides (16), spacers
(69) (Use slot on the guides and rotate CCW.)
Mark the location of guides on the seat ring (3) for
reference at re-assembly.
Lift up to remove seat ring (3) and gasket (13).
Inspect guides (16) and inside of the body cavity
(1) for any corrosion or product build up. Clean if
necessary.
Apply TFE paste to both sides of new gaskets and
install in body (1).
To Remove Lower Gasket: Separate pipeaway
body (20) from body (1). Remove lower gasket (13)
and clean sealing surfaces of both parts. Apply TFE
paste to both sides of new gasket (13) and install on
body (1).
Re-assemble vent in reverse order, making sure
that the pallet and loading weights are in their proper
location. Tighten bolts (11) and guides (16) to 15 ft.
lbs. (20.3 Nm). When installing the cover, ensure the
stem (10) is inserted in the stem guide.
To Remove Inlet Screen: Rotate bolts (15) CCW
and remove. Inspect and clean screen (14) and
reinstall to body (1).
WARNING
When assembling the vent, ensure that the stem is
straight and fi ts into the guide in the cover.
If the stem is cocked at an angle, pallet lift may be
completely blocked. This could result in an increase in
vacuum pressure in the tank and cause a tank failure,
severe personal injury and material damage.
SECTION V
V. MAINTENANCE
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.