IMPROVEMENTS IN THROTTLE VALVES
Year: 1863

page_text: LETTERS PATENT to Anthony Dugdale, of Rue de Courcelles, Paris,
in the Empire of France, Engineer, for the Invention of "IMPROVEMENTS
IN THROTTLE VALVES."
Sealed the 28th April 1863, and dated the 21st February 1863.
PROVISIONAL SPECIFICATION left by the said Anthony Dugdale at
the Office of the Commissioners of Patents, with his Petition, on the
21st February 1863.
I, ANTHONY DUGDALE, of Rue de Courcelles, Paris, in the Empire of
France, Engineer, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN THROTTLE VALVES," to be as follows:-
My Invention of improvements in throttle valves relates to an improved
mode of actuating them. As now practised the throttle valve is worked
direct from the governor, a rod from which is connected to a lever or arm on
the spindle of the throttle valve.
This arrangement is open to objection inasmuch as it causes the spindle to
wear loose in its bearings, and in order to avoid this I employ a supplementary
rocking shaft, to which the motion from the governor is communicated; and
this rocking shaft is connected by an arm and link to one side of the throttle
valve, so that as the rocking shaft oscillates on its axis it will open or
close the throttle valve. In order to preserve an uniform and regular action.

page_text: a weighted lever is mounted on the rocking shaft. By this means the spindle
of the throttle valve is not subjected to such incessant wear, and consequently
is not liable to become loose.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Anthony Dugdale in the Great Seal Patent Office on the
21st August 1863.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ANTHONY
DUGDALE, of Rue de Courcelles, Paris, in the Empire of France, Engineer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-first day of February, 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 Anthony Dugdale, Her special license, that I, the said Anthony
Dugdale, my executors, administrators, and assigns, or such others as I, the
said Anthony Dugdale, 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 THROTTLE VALVES," upon the condition, amongst others,
that I, the said Anthony Dugdale, 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 Immediately after the date of the said Letters Patent.
46
NOW KNOW YE, that I, the said Anthony Dugdale, 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, reference being had to the Drawing hereunto annexed, and to the
letters and figures marked thereon (that is to say) :-
My Invention of "Improvements in Throttle Valves" relates to an
improved mode of mounting and actuating them. As now practised the
throttle valve is worked direct from the governor, a rod from which is con-
nected to a lever or arm on the spindle of the throttle valve..!

page_text: This arrangement. is open to objection; inasmuch as it causes the spindle to
wear loose in its bearings in consequence of the continual friction to which it
is subjected.
In order to remedy this serious evil I have arranged my improved valve in
such manner that the pin upon which it is mounted or turns shall be entirely
independent of the actuating parts, and shall serve merely as a pivot for the
valve to turn upon, the parts for transmitting the movement of the regulator
being connected to one extremity of the body of the valve, and not as in the
plan now in use connected to the valve shaft.
My improved arrangement is represented at Figs. 1, 2, and 3 of the accom-
panying Drawing; Figs. 1 and 2 being longitudinal sections taken through
the middle of the steam pipe, provided with its throttle or regulating valve,
which in these two Figures is shewn in the position in which it would be in
order to completely close the steam pipe; Fig. 3 is an elevation or exterior
view of the steam pipe, shewing the parts for actuating the valve. In these
three Figures corresponding parts are indicated by similar letters of reference.
In my improved arrangement of throttle valve the body A of the valve
turns upon a pin B passing through its centre'; the valve A is actuated by
means of a link C connected to a forked arm D mounted upon the shaft E.
Upon this shaft, but outside the pipe, is a lever F hinged at I to the
actuating rod G. The lever F is provided with a moveable weight H for the
purpose of acting upon the valve. The Figures shew the manner in which
the different parts are mounted in the steam pipe, and it will be seen that in
this arrangement the pin B being placed in the middle of the thickness, and
in the line of the smallest diameter of the body A of the valve, this pin must
necessarily in all positions be subjected to about the same pressure, and allow
the plate to turn freely as upon a hinge or two pivots.
I would here observe that instead of the connecting rod or link C and
arm D for transmitting the movement of the shaft E to the valve, toothed
sectors or other equivalent mechanical arrangements may be employed.
Having now described my Invention of improvements in throttle valves,
and having explained the manner of carrying the same into effect, it will be
understood that this improved arrangement of valve may be applied to any
kind of steam engine governors. I do not, therefore, mean or intend to limit
myself to any particular form or construction of governor.
In conclusion, what I consider to be new in the above-described arrange-
ment for working throttle valves, is mounting and causing the valve to turn
upon a shaft independent of the actuating parts; these latter being connected

page_text: inside the steam pipe by jointed rods, toothed sectors, or other mechanical
equivalents connected to one extremity of the body of the valve, so that the
shaft shall serve merely as a hinge or pivot for the valve.
In witness whereof, I, the said Anthony Dugdale, have hereunto set my
hand and seal, the Twentieth day of August, in the year of our Lord
One thousand eight hundred and sixty-three.
Witness,
J. W. MOFFATT,
66, Chancery Lane.
A. DUGDALE. (L.S.)