IMPROVEMENTS IN STOP VALVES.
Year: 1875

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth and Company,
-
Patent Agency, of Frankfort-on-the-Main, in the Empire of
Germany, for the Invention of "IMPROVEMENTS IN STOP VALVES.".
A communication from William Knaust, Manufacturer, residing
at Vienna, in the Empire of Austria.
Sealed the 2nd July 1875, and dated the 24th February 1875.
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the
Office of the Commissioners of Patents, with his Petition, on the
24th February 1875.
I, FRANK WIRTH, of the Firm of Wirth and Company, Patent Agency,
of Frankfort-on-the-Main, in the Empire of Germany, do hereby declare
the nature of the said Invention for “ImproVEMENTS IN STOP VALVES," a
communication, to be as follows :→

page_text: Second. In the pressing of the said conical pieces in their seats by
means of a wedge, which only follows the upward and downward move-
ment of a vertical spindle, but not the rotating movement of the latter.
Two pipes are closed by two conical pieces, which by a wedge, in screwing
down a spindle, are pressed into the conical seats.
The advantages of this construction are as follows:-
First. The closing is effected more perfectly and the stream of the
liquid is prepared for the unavoidable change in direction. The valve
seat is kept clean because the liquid stream washes impurities away.
Second. The closing surfaces in the lower part of the pipe do not with
their surfaces glide one on another when the valve is opened, but they are
separated from each other. Impurities settle principally in the lower part
of the tubing, hence there is danger that in closing the valve particles
of dirt may be pressed between the surfaces. If now the valve is opened
and the surfaces glide on each other, as this is the case with the plate
and disc valves hitherto in use, the dirt particles tightly pressed cause
one or more small grooves till the valve gets leaky. This inconvenience
is being obviated in my double cone stop valve, because as already
mentioned the closing surfaces in the lower part of the pipe leave one
instead of sliding on each other.
Third. The wrenching movement which, by closing the pipe, would
turn the two cones round their vertical axis, is intercepted by two
another guiding edges provided in the casing of the valve.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Frank Wirth in the Great Seal Patent Office 20
on the 19th August 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, FRANK
WIRTH, of the Firm of Wirth and Company, Patent Agency, of Frank-
fort-on-the-Main, in the Empire of Germany, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters 30
Patent, bearing date the Twenty-fourth day of February, in the year of
our Lord One thousand eight hundred and seventy-five, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors, give

page_text: and grant unto me, the said Frank Wirth, Her special licence that
I, the said Frank Wirth, my executors, administrators, and assigns,
or such others as I, the said Frank Wirth, my executors, admini-
strators, 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 STOP
VALVES," a communication from William Knaust, Manufacturer, a
person resident at Vienna, in the Empire of Austria, upon the con-
dition (amongst others) that I, the said Frank Wirth, my executors
or administrators, by an instrument in writing, under my, or their, or
one of their hands and seals, should particularly describe and ascer-
tain 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 Frank Wirth, do hereby declare
the nature of the. said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the
following statement, reference being had to the accompanying Drawing
forming a part of this Specification :-
The two pipes a, a, (Figure 1 of the annexed Drawing) are closed by.
the two conical pieces b, b, (the one of which is represented in Figure 4)
which by a wedge c (Figures 2 and 3) is in screwing down the spindle d,
are pressed into the conical seats.
The advantages of this construction are as follows:
:—
First. The closing is effected more perfectly and the steam of the
liquid is prepared for the unavoidable change in direction. The valve
seat is kept clean because the liquid stream washes impurities away.
Second. The closing surfaces in the lower part of the pipe do not with
their surfaces glide one on another when the valve is opened, but they
are separated from each other. Impurities settle principally in the
lower part of the tubing, hence there is danger that in closing the valve
particles of dirt are pressed between the surfaces. If now the valve is.
opened and the surfaces glide on each other, as this is the case with the