Improvements in or relating to Draw-off Taps.
Year: 1893

page_text: Date of Application, 3rd May, 1893-Accepted, 2nd June, 1893
COMPLETE SPECIFICATION.
Improvements in or relating to Draw-off Taps.
We, BECK AND COMPANY, LIMITED, Engineers, and ALEXANDER WYND
and HENRY HANDOLL, Mechanics, all of 130, Great Suffolk Street, Southwark,
in the County of Surrey, do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascer-..
tained in and by the following statement :-
This invention relates to all kinds of draw off taps or bib cocks and has for its.
object to prevent external leakage when the valve is open, and to dispense with
the necessity for either joint-washers or packings or spinille stuffing box, and hence
to effect increased facility of manufacture and secure economy in production,.
combined with great efficiency and durability.
According to our invention for preventing leakage at the cover joint we form in
each bearing face at the joint one or more corresponding annular grooves or
cavities of any suitable form and area in cross section so that when the two faces.
are put together in position one or more hollow annuli is or are formed around and
in the joint; where more than one such annulus is formed they are connected by
suitable passages, and from one of them an eduction pipe or channel is formed to
lead to the nose of the cock, and thus any leakage finds its way into the annulus
before arriving at the joint and is carried off by the eduction pipe by the current
induced by the flow of liquid through the nose.
To prevent leakage from the spindle passing through the cover as well as the
cover joint, we either form around the valve spindle in the body of the metal of
the cover an annular cavity or cavities and connect same by a suitable passage or
passages with the above described arrangement for the joint, or we form the one
annulus of such dimensions as also to combine and include both cover joint and
spindle as hereinafter described, and thus any leakage into the cover is similarly
educted by and with the main flow and effectually prevented.
In the accompanying drawings which form part of this Specification, Fig. 1 is a
section of a bib cock with the valve closed, showing a single cover-joint annulus
and eduction pipe; Fig. 2 is a plan on line 1-2 of Fig. 1; Fig. 3 is a section of
a bib cock with the valve open, showing both cover-joint and spindle annuli and
eduction passages; Fig. 4 is a section of a bib cock with the valve closed, showing
combined cover-joint and spindle annular cavity and eduction pipe. In all the
figures like letters refer to like parts.
B is the body of the tap, C the cover, J the joint between the said body and
cover, V is the valve, its seating, and S the valve spindle and handle, all of
which are or may be arranged in the usual manner.
In Figs. 1 and 2, a is the annular cavity, one portion of which is formed in and
around the bearing face of the cap C, and the other corresponding portion in and
around the bearing face of the body B in the horizontal cover-joint J, e is the
eduction pipe in open connection with the cavity a and leading therefrom to the-
nose of the tap.
In Fig. 3, the same arrangement is shown, and in combination therewith we
form the cavity c in the cover C around the spindle S and the eduction passages e'e¹
connecting the two annuli c and a.
Fig. 4 illustrates the above described separate hollow annuli cand a and
passages el combined in one annular cavity ca." This may be of any suitable form
in cross section and the construction admits of the cap C being made light and
screwed upon the outside of the body B, and is the eduction pipe as before. By
the above described arrangement neither joint washers or packings or spindle
stuffing hox generally hitherto used are required and may be dispensed with.

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is
1. In draw off taps, constructing the joint between the body and the cover with
one or more corresponding hollow annuli such as a in open connection through an
eduction pipe e with the nose of the tap as and for the purpose set forth in
reference to Figs. 1 and 2.
с
2. In draw off taps, the combination with the arrangement above described and
. claimed of the annulus c formed in the cover surrounding the spindle and eduction
passage or passages e' substantially as and for the purposes described and illustrated
in Fig. 3.
3. In draw off taps, the construction illustrated in Fig. 4 for preventing external
leakage without packing or stuffing box as described.
For the Applicants,
J. C. CHAPMAN,
70, Chancery Lane, London, W.C., Chartered Patent Agent.