IMPROVEMENTS IN THE VALVE GEAR OF STEAM ANd OTHER MOTIVE-POWER ENGINES
Year: 1873

page_text: LETTERS PATENT to Barnard William Farey, of the Firm of Bryan,
Donkin, and Company, of Bermondsey, in the County of Surrey,
for the Invention of "IMPROVEMENTS IN THE VALVE GEAR OF STEAM ANd
OTHER MOTIVE-POWER ENGINES."
PROVISIONAL SPECIFICATION left by the said Barnard William Farey
at the Office of the Commissioners of Patents, with his Petition,
on the 20th February 1873.
I, BARNARD WILLIAM FAREY, of the Firm of Bryan, Donkin, and
Company, of Bermondsey, in the County of Surrey, do hereby declare
the nature of the said Invention for "IMPROVEMENTS IN THE VALVE GEAR
OF STEAM AND OTHER MOTIVE-POWER ENGINES," to be as follows:-
This Invention has for its object improvements in the valve gear of
steam and other motive-power engines.

page_text: slide valve of the first or high-pressure cylinder with the slide valve of
the second or low-pressure cylinder by means of a rod which passes from
one valve to the other within the passage which conveys the steam
(or fluid) from one cylinder to the other. The rod catches hold of the
high-pressure cylinder slide valve on the exhaust or under side, and on
the low-pressure cylinder slide valve on the top.
The arrangement is similar where more than two cylinders are
employed.
I also in compound or other engines sometimes connect the valve rod
to the valve by a projection or lug on the valve passing out of the
valve chest through a hole or opening prepared for it in the valve face.
The margin of the hole or opening is truly surfaced, and the valve
fits upon it steam-tight or nearly so; in this way the use of a gland is
avoided, and the valve rod is brought nearly into the direct line with the
resistance it has to overcome.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Barnard William Farey in the Great Seal Patent
Office on the 13th August 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, BARNARD
WILLIAM FAREY, of the Firm of Bryan, Donkin, and Company, of
Bermondsey, in the County of Surrey, send greeting.
.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twentieth day of February, in the year of
our Lord One thousand eight hundred and seventy-three, in the thirty-
sixth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Barnard William Farey, Her special license
that I, the said Barnard William Farey, my executors, administrators,
and assigns, or such others as I, the said Barnard William Farey, 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 THE VALVE GEAR OF STEAM AND OTHER MOTIVE-POWER ENGINES," upon the

page_text: condition (amongst others) that I, the said Barnard William Farey,
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 imme-
diately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Barnard William Farey, 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 thereof, that is to say :—
This Invention has for its object improvements in the valve gear of
steam and other motive-power engines.
In compound engines in which the steam or elastic fluid working the
engine passes in succession into two or more cylinders I couple the
slide valve of the first or high-pressure cylinder with the slide valve of
the second or low-pressure cylindor, by means of a rod which passes from
one valve to the other within the passage, which conveys the steam (or
fluid) from one cylinder to the other. The rod catches hold of the high-
pressure cylinder slide valve on the exhaust or under side, and on the
low-pressure cylinder slide valve on the top.
The arrangement is similar where more than two cylinders are
cmployed.
I also in compound or other engines sometimes connect the valve
rod to the valve by a projection or lug on the valve passing out of the
valve chest through a hole or opening prepared for it in the valve face.
The margin of the hole or opening is truly surfaced, and the valve fits
upon it steam-tight or nearly so; in this way the use of a gland is
avoided and the valve rod is brought nearly into the direct line with the
resistance it has to overcome.
In order that my said Invention may be most fully understood and
readily carried into effect, I will proceed to describe the Drawings herc-
unto annexed.

page_text: Figure 2 is a transverse section taken on the line 1-1 in Figure 1;
Figure 3 is a plan of the valve faces; and Figure 4 is an under side view
of the high-pressure valve.
The high-pressure valve a works on the face in the valve chest c,
to which the steam is first admitted; d, d, are the ports and passages
leading to the cylinder; and e, e, are the exhaust ports. The steam
after working in the high-pressure cylinder passes by these ports into the
passage, and so to the valve chest 9 in which is the low-pressure
valve h; this valve works on the face i, in which are the steam ports k, k,
and the exhaust port 1, as usual; m is the valve rod; it is worked by
eccentrics or otherwise, as well understood, and it is attached in the
ordinary way to the upper or outer side of the low-pressure valve h,
but to the high-pressure valve a the valve rod is connected on the under
or inner side, and the valve rod runs along the passage f by which the
steam is conveyed from one cylinder to the other.
In order to form the connection between the valve a and the rod m
a projection a¹ is formed in the valve; it is received into an opening t
in the valve face, and into a cavity in the projection a¹. A block a² is
fitted, and this block is screwed as a nut on to a thread cut upon tho
valve rod m. The valve rod m passes out of the steam passage by an
ordinary stuffing box n, but if desired this stuffing box may be dispensed
with in the manner indicated by Figures 5 and 6.
Figure 5 is a longitudinal section, and Figure 6, a transverse section
of the valve and parts connected therewith of a single cylinder engine,
but the method of dispensing with a stuffing box for the valve rod,
which is here shewn, is applicable also to compound engines.
a is the valve face; it has the usual steam and exhaust ports a, a¹,.
and a³, and it has also an additional opening a³. bis the valve; it has
a projection 6¹ upon its under side, and this projection passes through:
the opening a³, and the valve rod c is attached to it. d is the valve chest
into which the steam is admitted.
These improvements are applicable, not only to engines worked by
steam, but also where other fluids are used.
What I claim is the method of connecting together the valves of
compound engines, substantially as described.

page_text: I also claim the method of dispensing with a stuffing box in con-
necting the slide valve with its actuating mechanism, substantially as
described.
In witness whereof, I, the said Barnard William Farey, have
hereunto set my hand and seal, this Eleventh day of August, in
the year of our Lord, One thousand eight hundred and seventy-
three.