IMPROVEMENTS IN COCKS OR TAPS FOR LIQUIDS
Year: 1860

page_text: LETTERS PATENT to John Petrie, junior, of Rochdale, in the County of
Lancaster, Ironmonger, for the Invention of "IMPROVEMENTS IN COCKS
OR TAPS FOR LIQUIDS."
Sealed the 8th March 1861, and dated the 12th September 1860.
PROVISIONAL SPECIFICATION left by the said John Petrie at the
Office of the Commissioners of Patents, with his Petition, on the 12th
September 1860.
I, JOHN PETRIE, junior, of Rochdale, in the County of Lancaster, Iron-
5 monger, do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN COCKS OR TAPS FOR LIQUIDS," to be as follows:-
My Invention consists in the employment of two valves acting together, the
one having a greater area than the other, so that when they are kept open
the liquid may pass through them, but when released they close with the
excess of pressure upon the larger. The cock or tap is thus self-acting, but
may be provided, if desired, with catches or other apparatus for keeping
it open.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Petrie in the Great Seal Patent Office on the 12th
March 1861.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
PETRIE, junior, of Rochdale, in the County of Lancaster, Ironmonger, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twelfth day of September, One thousand eight
hundred and sixty, in the twenty-fourth year of Her reign, did, for Herself,
Her heirs and successors, give and grant unto me, the said John Petrie,
junior, Her especial license that I, the said John Petrie, junior, my executors,
administrators, and assigns, or such others as-I, the said John Petrie, junior,
my executors, administrators, and assigns, should at any time agree with, and
no others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and vend,
within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN COCKS OR
TAPS FOR LIQUIDS," upon the condition, amongst others, that I, the said John
Petrie, junior, by an instrument in writing under my hand and seal, should
particularly describe and ascertain the nature of the said Invention, and in
what manner the same was to be performed, and cause the same to be filed
in the Great Seal Patent Office within six calendar months next and imme-
diately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said John Petrie, junior, do hereby
declare the nature of my said Invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement and accompanying Drawings, that is to say:
The
The accompanying Drawing shews the cock or tap in section.
induction passage is at a, and the eduction at b. At c, d, are two seats, to
which valves e, f, are adapted fixed upon a spindle g, which passes through the
tap, and is provided with a button at h. The valve e is superior in area to
the valve, and the two are therefore held to their seats by the pressure of the
fluid, so that according to the position shewn in the Drawing the tap is closed.
in order to allow the liquid to flow into the eduction passage; the spindle. g. is
raised, so as to open ways through the two seatings c, d. Upon leaving the
spindle at liberty, the fluid acting upon both valves, will tend to keep them in
equilibrium, but as the area of e is greater than that of f, a downward motion
will be imparted, and the tap will be closed by self-acting means; and it is
9.

page_text: evident that the force with which this closing shall take place may be regulated
by varying the proportion of one area to the other. In the Drawing I have
shewn a spring at i, which retains the leather washer k in its proper position,
and tends to force the valves to their seats; this spring may be employed
(although not absolutely necessary in all cases) in order to give a start to the
spindle, especially where the fluid acts at a comparatively low pressure.
Having thus described and ascertained the nature of my said Invention, and
the manner in which the same is to be performed, I desire it to be understood
that I claim as secured to me under the above in part recited Letters Patent,
and for the purpose herein-before described, two valves, the one of superior
area to the other.
In witness whereof, I, the said John Petrie, have hereunto set my
hand and seal, this Eleventh day of March, in the year of our Lord
One thousand eight hundred and sixty-one.
JOHN PETRIE, JR. (L.S.)