IMPROVEMENTS IN VALVES FOR THE PASSAGE OF STEAM, GAS, AND FLUIDS
Year: 1863

page_text: LETTERS PATENT to James John Shedlock, of Vincent Street, West-
minster, in the County of Middlesex, Gas Engineer, for the Invention of
"T
BAR
www Dicasa C G AND FLUIDS
"
PROVISIONAL SPECIFICATION left by the said James John Shedlock
at the Office of the Commissioners of Patents, with his Petition, on
the 16th June 1863.
I, JAMES JOHN SHEDLOCK, of Vincent Street, Westminster, in the County
5 of Middlesex, Gas Engineer, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN VALVES FOR THE PASSAGE OF STEAM, GAS,
AND FLUIDS," to be as follows:-
This Invention has for its object improvements in valves for the passage of
steam, gas, and fluids; and in order that these improvements may be carried
O out, a suitable box or body is provided, having inlet and outlet passages. A
frame, to which is attached the valve, rests and slides upon bearings or guides
fixed in the interior of the box or body. Upon the top of the frame and at
the back of the valve is formed a pin or stud, the space between this pin or
stud and the back of the valve being made to correspond with a spiral
5 projection cast upon the face of a plate which is fixed on the spindle. The
spindle passes through the box or body and is received and encased in a
stuffing box to prevent any escape from the box or body. The pin on the
frame regulates the opening and closing of the valve by being made to fit the

page_text: inner side of the spiral projection on the face of the plate attached to the
spindle; upon giving a rotatory motion to the spindle the spiral draws the pin
nearer to the centre of the plate on which the spiral is formed, and conse-
quently opens the valve to allow the passage of the steam, gas, or fluid. By
reversing the movement the spiral presses against the back of the valve until
the point of. pressure on the spiral has arrived at its greatest distance from
the centre of the plate, when the face of the valve is forced against its seat
and effectually cuts off .the flow of steam, gas, or fluid. The valve may be
made either flat, conical, or circular, according to the form of the seat; any
suitable metal may be used for the valve and seat, but if preferred the valve
may be faced with any elastic substance.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James John Shedlock in the Great Seal Patent
Office on the 16th December 1863.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
JOHN SHEDLOCK, of Vincent Street, Westminster, in the County of Middlesex,
Gas Engineer, send greeting.
- WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Sixteenth day of June, in the year of our Lord
One thousand eight hundred and sixty-three, in the twenty-sixth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said James John Shedlock, Her special licence that I, the said James
John Shedlock, my executors, administrators, and assigns, or such others
as I, the said James John Shedlock, 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 VALVES FOR THE PASSAGE OF STEAM, GAS, AND
FLUIDS," upon the condition (amongst others) that I, the said James John
Shedlock, my executors or administrators, by an instrument in writing under
my, or their, or one of their hands and seals, 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 immediately after the date
of the said Letters Patent.

page_text: NOW KNOW YE, that I, the said James John Shedlock, 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 the
following statement:-
and by
This Invention has for its object improvements in valves for the passage of
steam, gas, and fluids; and in order that these improvements may be carried
out, I provide a case or body having inlet and outlet passages. In the
interior of the case or body ledges or guides are fixed for the purpose of
carrying a plate or carriage, upon one end of which is fixed the valve. A pin
or projection is securely fixed in the plate or carriage at a distance from the
valve corresponding with a spiral. This will be better understood by referring
to the Drawing hereunto annexed. The same letters of reference indicate
corresponding parts in the several Figures when such parts appear.
In Fig. 3, which is a section through A', B', in Fig. 1, the spiral Fis
shewn with its shortest radius between the pin or projection and the back of
the valve. In this position the valve is opened to its full extent. (The
shortest radius is shewn by the dotted line 1.) The spiral F being fixed on
the spindle G, which passing through the stuffing box II, is attached to the
wheel or lever I. Upon turning the wheel or lever I in the direction required
the spindle and spiral are made to describe a circle; part of the spiral pressing
against the back of the valve forces it forward until the greatest radius on
the spiral (shewn by the dotted line 2) presses against the valve, when the
valve will be forced against its seat, cutting off the flow of the steam, &c.
In Fig. 3 the valve is shewn open to its full extent, while in Fig. 5 the valve
is shewn closed on its seat J, when it will be seen the greatest radius on the
spiral is pressing against the back of the valve. Fig. 3 being a sectional plan,
the two guides or ledges D, D, are shewn upon which the plate or carriage B
is allowed to slide. The valve C is shewn to consist of three separate discs,
the centre one being made of any suitable elastic substance, but I do not
confine myself to that particular form of valve, as any may be introduced to
correspond with the valve seat J ; neither do I confine myself to the precise
details of the case or body, as those may be varied without departing from the
features of my Invention. The inlet and outlet connections may be made to
suit any pipe, whether flanged, socket, or screwed. Any suitable material
inay be used in the manufacture of these valves.
Fig. 1 is a side elevation; Fig. 2 is an end elevation; Fig. 3 is a sectional
plan at A', B'; Fig. 4 is a sectional elevation at C, D; Fig. 5 is also a
sectional elevation at E¹, F¹.
Having described the nature of my Invention for improvements in valves, I

page_text: would have it understood I do not confine myself to the precise form, but
what I claim as novel, and desire to be secured to me is, the method of regu-
lating the flow through valves by means of the combined arrangement of the
spiral acting upon the back of the valve and the pin attached to the plate or
carriage, substantially as herein-before described.
In witness whereof, I, the said James John Shedlock, have hereunto
set my hand and seal, this Fifteenth day of December, in the year of
our Lord One thousand eight hundred and sixty-three.
JAMES JOHN SHEDLOCK. (L.S.)