A NEW COMBINATION OF SLIDE VALVES AND PORTS FOR THE INDUCTION AND EDUCTION OF STEAM OR OTHER ELASTIC FLUID IN STEAM ENGINES, OR OTHER ENGINES OF SIMILAR CHARACTER
Year: 1855

page_text: LETTERS PATENT to Auguste Edouard Loradoux Bellford, of 32, Essex
Street, Strand, London, Patent Agent, for the Invention of "A NEW
COMBINATION OF SLIDE VALVES AND PORTS FOR THE INDUCTION AND EDUCTION
OF STEAM OR OTHER ELASTIC FLUID IN STEAM ENGINES, OR OTHER ENGINES OF
SIMILAR CHARACTER."-A communication.
Sealed the 26th October 1855, and dated the 26th April 1855.
PROVISIONAL SPECIFICATION left by the said Auguste Edouard Loradoux
Bellford, at the Office of the Commissioners of Patents, with his Petition,
on the 26th April 1855.
I, AUGUSTE EDOUARD LORADOUX BELLFORD, of 32, Essex Street, Strand,
London, Patent Agent, do hereby declare the nature of the said Invention
for "A NEW COMBINATION OF SLIDE VALVES AND PORTS FOR THE INDUCTION AND
EDUCTION OF STEAM OR OTHER ELASTIC FLUID IN STEAM ENGINES, OR OTHER ENGINES
OF SIMILAR CHARACTER," a communication, to be as follows:-
This Invention is intended to obviate a great difficulty, which is encountered'
in giving the short slide valve any very considerable amount of lap for the
purpose of cutting off the steam early in the stroke of the piston, viz., the
choking or closing of the port through which the steam is exhausting, some
time before, the stroke of the piston terminates. It also provides for greater
freedom of exhaust from the commencement of the stroke of the piston, and
is therefore advantageous even where the lap of the valve is not sufficient to
cause the exhaust to be choked before the end of the stroke.

page_text: The Invention consists in the employment, in combination with the usual
slide valve, of a supplemental slide valve, constructed and operated as herein-
after described, to move over a separate series of ports communicating with
the same passages as the ports over which the usual slide valve works, for the
purpose of allowing a free exhaust until the end of the stroke of the piston.
The valve seat has steam ports and an eduction port arranged in the usual
manner, and covered by a slide valve, having a proper degree of lap to cut off
the steam shortly after half stroke. The supplemental ports are arranged side
by side with the usual-ports,-and-communicated-with-by-transverse passages.
The supplemental ports may be of any area most advantageous, but about
one-fourth. of the area of the other ports will serve every purpose. The
supplemental valve contains a cavity in its face like the common slide valve,
the length of which cavity is such that it will nearly cover the eduction port
and the two spaces between it and the ports by the side of the induction ports.
The entire length of the valvo is sufficient to allow it to receive such a move-
ment as to bring one and the other of the ports-by the side, of the induction
ports into full communication with the eduction port without uncovering either
to admit steam from the valve chest
1 Y-
The valve is set in the same way as a common slide valve, constructed
without lap or lead, so that one or other of the ports, as may be required, will
always, except at the instant of the piston being at the end of its stroke, be in
communication with the exhaust port. The valves must work independently
of each other; as the supplemental, valve does not require so long a stroke as
the other. The. movement of the usual valve may be given by an eccentric
in the usual way. The movement of the supplemental valve may be produced
by an eccentric, the cam being preferable, as by it the exhaust may be opened
wide almost instantaneously, or it may be given by tappets applied to the
usual valve.
The effect of the supplemental valve will be understood by assuming that
the usual valve is a little beyond half stroke, h having cut off the steam and
closing its eduction port; the supplemental valye is moving in the same
direction, but its eduction port is scarcely yet commenced to be contracted, and
will not be closed until the stroke of the piston terminates. "The s supplemental
eduction valve and, ports not only ensure a free exhaust to the end of the
stroke, but, before communication with the ordinary eduction port is closed, or
if the ordinary valve, is so constructed as not to close the exhaust before the
end of the stroke, it enlarges the area of opening' for eduction relatively to
the area of opening for induction.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Auguste Edouard Loradoux Bellford in the Great Seal Patent
Office on the 26th October 1855.
"
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, AUGUSTE
EDOUARD, LORADOUX BELLFORD, of 32, Essex Street, Strand, London, Patent
Agent, send greeting.
WHEREAS, Hér most Excellent Majesty Queen Victoria,' by Her. Letters
Patent, bearing date, the Twenty-sixth day of April, in the year of our Lord
One thousand eight hundred and fifty-five,. in the eighteenth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
'the said Auguste Edouard Loradoux Bellford, Her special licence that. I; the
Said Auguste Edouard Loradoux Bellford, my executors, administrators, and
assigns, or such others as I, the said Auguste Edouard Loradoux. Bellford,
my executors, administrators, and assigns, should at any time agree with, and
ño others, froin 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 "A. NEW COMBINATION OF SLIDE VALVES
AND PORTS FOR THE INDUCTION AND EDUCTION OF STEAM. OR OTHER ELASTIC FLUID, IN
STEAM ENGINES, OR OTHER ENGINES OF SIMILAR CHARACTER," (a communication,)
upon the, condition (amongst others) that I, the said Auguste Edouard
Loradoux Bellford, 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.
NOW KNOW YE, that I, the said Auguste Edouard Loradoux Bellford,
do hereby declare the nature of the said Invention, and in what manner
the, same is to be perfórmed, to be particularly described and ascertained in
and by the following statement, that is to say:-
This Invention is intended to obviate a great difficulty which is encountered
in giving the short slide valve any very considerable amount of lap for the
purpose of eutting off the steam early in the stroke of the piston, viz., the
choking or closing of the port through which the steam is exhausting, some
time before the stroke of the piston terininates. It also provides for greater
freedom of exhaust from the commencement of the stroke of the piston, and
is therefore advantageous even where the lap of the valve is. not sufficient
to cause the exhaust to be choked before the end of the stroke.

page_text: The Invention consists in the employment, in combination with the usual
slide valve, of a supplemental slide valve, constructed and operated as herein-
after described, to move over a seperate series of ports communicating with the
same passages as the ports over which the usual slide valve works, for the
purpose of allowing a free exhaust until the end of the stroke of the piston.
The accompanying Drawings shew the steam chest, valves, and ports of a
steam engine, constructed according to the Invention.
Similar letters of
Fig. 1 is an interior view of the valve chest, shewing the arrangement of
the ports; Fig. 2 is a section of the same, in the line a, a, of Figs. 1 and 8;
and Fig. 3 is a section, in the line y, y, of Figs. 1 and 2.
reference indicate corresponding parts in the several Figures.
A is the valve seat, having steam ports a, a, and an eduction port b, arranged
in the usual manner (see Fig. 1), and covered by a slide valve B, which is
represented as having a proper degree of lap to cut off the steam shortly
after half stroke. This valve is shown in all the Figs. of the Drawing, but in
Fig. 1 it is shewn in red outline, with the exhaust cavity e, e, in the face dotted.
a', a', b', are the ports over which the supplemental eduction valve C works.
These ports are arranged side by side with the ports a, a, b, the ports à', a',
communicating with a, a, by transverse passages c, c, and the port b' commu-
nicating with 6 by a transverse passage d.
.
The ports a', a', b', may be of any area that may be considered most!
advantageous, but about one-fourth of the area of their respective ports a, a, b,
will serve every purpose. The valve C contains a cavity f, f, in its face, like
the common slide valve, the length of which cavity is such that it will nearly
cover the exhaust port 6', and the two spaces between it and the ports a¹, a¹.
The entire length of the valve is sufficient to allow it to receive such a move-
ment as to bring one and the other of the ports a', a¹, into full communication
with the port without uncovering either to admit steam from the valve chest.
The valve is set in the same way as a common slide valve, constructed without
lap or lead, so that one or other of the ports a¹, a¹, as may be required, will
always, except at the instant of the piston being at the end of its stroke, be in
communication with the exhaust port b¹. The valves B and C must work
independently of each other, as C does not require so long a stroke as B.
The movement of B.may be given by an eccentric connected with its rod g
in the usual way.
The movement of C may be produced by a seperate
eccentric, or by a cam connected with its rod g', the cam being preferable, as by
it the exhaust may be opened wide almost instantaneously; or it may be given
by tappets applied to the valve B.
The effect of the supplemental eduction valve C will be understood by

page_text: reference to Figs. 1 and 2, where the usual valve B, supposed to be moving
in the direction of the red arrow, is represented in a position it would assume
shortly after half stroke, having cut off the steam at the left-hand port a¹, and
since closed the eduction through the right-hand port a. The valve C is
moving in the same direction, but the eduction through the right-hand port a¹
is scarcely yet commenced to be contracted, and will not be closed until the
stroke of the piston terminates. The supplemental eduction valve and ports
not only ensure a free exhaust to the end of the stroke, but, before commu-
nication with the ordinary eduction port 6 is closed, or if the ordinary valve
is so constructed as not to close the exhaust before the end of the stroke,
it enlarges the area of opening for eduction relatively to the area of opening
for induction.
Having thus fully described the nature of the said Invention, and the
manner in which it is or may be carried into effect, I wish it to be understood
that what I claim is, the employment, substantially as herein described, in
combination with the usual slide valve B, of a supplemental eduction valve C
working over a seperate series of ports, which are similarly arranged to and
communicate with the same passages as the usual ports, for the purpose of
giving a free exhaust until the termination of the stroke of the piston, and for
enlarging the area of opening for eduction relatively to the area of opening
for induction.
In witness whereof, I, the said Auguste Edouard Loradoux Bellford,
have hereunto set my hand and seal, this 23rd day of October, in the
year of our Lord One thousand eight hundred and fifty-five.
A. E. LORADOUX BELLFORD. (L.S.)