flexible rubber hose connect the seal-water inlet to
the fresh water supply in the pump room.
As of this writing, steel-braided jacketed
hose is being installed during available yard
periods to replace the flexible-rubber seal-water
Internally, the feed tube assembly is constructed
to direct the feed and the seal water to a nylon regu-
lating tube. The regulating tube then directs this
liquid to the center of the tubular shaft (part of the
bowl shell assembly).
The feed tube is also the shaft for the paring
disk. The spring-loaded handle, extending out the top
of the feed tube assembly, is used to screw the feed
tube into the paring disk. The handle remains down
when the two are engaged. When not engaged, the
spring forces the handle and feed tube up and away
from the paring disk.
The feed tube has left-hand threads. The
feed tube must be disengaged from the paring
disk before the cover can be opened.
Equally spaced around the bottom of the cover
are three handwheel cover clamp catches. These
hook-shaped catches are used to lock the cover in the
Inside the dome-shaped cover is the water-
discharge chamber. This chamber normally receives
the water discharged from the revolving bowl. This
water is directed to the water-discharge outlet area of
the water-discharge chamber. An observation port is
provided to enable a visual check of the discharging
water. The port has a metal cover that is swung to
one side when it is opened. The port, when open, is
just a hole. No glass or other transparent medium is
provided to cover the open port.
The bowl casing is a circular stationary tub that
houses the rotating-bowl shell assembly. The
stationary part of the cover hinge, inlet, and outlet
assembly is welded to the outside of the bowl casing.
Three handwheel cover clamps are equally
spaced around the top of the bowl casing to lock the
cover in the closed position. Each handwheel cover
clamp has a hook that engages the catch on the cover.
Rotating the handwheel screws the hook down upon
the catch, which in turn pulls the cover down.
Handtight is sufficient for proper locking of the cover
in the closed position. A large oil-resistant ring
provides a liquid-tight seal between the cover and the
bowl casing when the cover is closed.
Two bowl-shell lock screws (fig. 4-28) are housed
in the upper part of the bowl casing. These locking
devices lock the bowl shell assembly during disas-
sembly and assembly. They are engaged to prevent
the bowl shell assembly from rotating. A threaded
bushing in the bowl casing allows the lock screws,
which are also threaded, to be screwed into or out of
the lock position. When the lock screws are in the
lock position, they engage a slot in the revolving-bowl
The two bowl-shell lock screws must be
removed before starting the purifier. Two bowl-
shell lock screw plugs are provided to plug up
the threaded hole in the bowl casing when the
lock screws are removed.
A water-discharge connection is welded to the
upper portion of the bowl casing. This connection is
aligned with the water-discharge connection in the
cover assembly when the cover is closed. An
Figure 4-28.Bowl-shell lock screw and plug.