June, 1954]
JAMES
N.
WARNER
AND
O.
P.
AGARWALA
107
to inside the can, might be useful in reducing the incidence of adulteration of the
can contents during route delivery. However, certain possible designs of such a
faucet are so complicated that their construction obviates proper sanitation. An
ideal design would include a minimum of different parts which would be inter-
changeable between faucets, at least on the different cans owned by a particular
dairy. Then too, the constructional characteristics of each part would be such as
to permit easy and effective cleaning and sterilization. A faucet with certain of
these characteristics is discussed here.
Description of the faucet
One of the common valves for a milk delivery can was modified by making
changes in the plug and by redesigning the milk outlet. This modified faucet
(Fig. 2) consists of the following parts: 1. The faucet body, including a feed pipe
inlet, a feed pipe flange, a faucet plug housing, a feed pipe threaded outlet, and a
milk outlet cone; 2. The faucet plug; 3. The faucet plug locking collar; 4. The
ring valve; and 5. The ring valve housing. The faucet plug, plug locking collar,
ring valve and ring valve housing are separable from the faucet body. All parts,
except the ring valve and the faucet plug locking collar are made of cast brass;
the ring valve is made of plastic, the locking collar of rolled or sheet brass. It is
recommended that, except for the side walls of the faucet plug and the inside surface
of the faucet plug housing, surfaces which must be ground to fit together so well
as to prevent leakage of milk when the faucet is assembled, all cast brass parts
should be tin-plated on their inside and outside surfaces.
Faucet body. The faucet body is fixed to the can and supports the removable
parts of the faucet when fully assembled. The overall length of this piece is four
and a half inches, of which only two and a half inches extend outside the milk can
when properly installed.
The feed pipe inlet is a tube about two and a half inches long with an inside
diameter of one-half inch; the wall of this tube may be about three-thirty-seconds
inch thick. The inner end of this pipe is bevelled, diagonal to its long axis, begin-
ning on its top outside, roughly one and a three-fourth inch as from its inner end,
and continuing approximately to the opposite or bottom interior surface just at
the inner end of the piece. This bevelled opening is cut so that its edges coincide
with the interior surfaces of the can side wall and/or bottom when the faucet is
fixed in its proper position in the can, thereby facilitating complete drainage of the
can. The outer end of this tube is fixed to the faucet plug housing, and opens into
the faucet plug space inside this housing.
Fixed about this tube, approximately two inches from its inner end, is the feed
pipe flange. As the faucet body is fixed to the can, the faucet tube inlet is inserted
through a hole in the side wall and/or bottom of the can, and up to this flange.
The faucet body is then welded or soldered firmly in place with all rough edges,
both inside and outside, smoothed off with a fine file or abrasive. The flange,
therefore, strengthens the attachment of the faucet to the can. This flange is about
one-eighth inch thick and one and a half inches in outside diameter.