IMPROVEMENTS IN SLIDE VALVES AND PISTONS
Year: 1875

page_text: LETTERS PATENT to William George Beattie, of Nine Elms, in the
County of Surrey, Engincer, for the Invention of "IMPROVEMENTS IN
SLIDE VALVES AND PISTONS."
Scaled the 4th January 1876, and dated the 12th August 1875.
PROVISIONAL SPECIFICATION left by the said William George
Beattie at the Office of the Commissioners of Patents, with his
Petition, on the 12th August 1875.
I, WILLIAM GEORGE BEATTIE, of Nine Elms, in the County of
Surrey, Engineer, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN SLIDE VALVES AND PISTONS," to be as follows:-
My improvements as applied to slide valves are as follows:-I form
the body of the valve of cylindrical shape in two or more parts or
sections, between which I place the packing rings which form the
working surfaces of the valve. These rings are to be of a width equal
to the lap of the valve added to the width of the steam port or ports,
and are to be cut through and then turned, so that when placed in the
steam chest they fit it and are slightly compressed. I pass a valve

page_text: spindle through the sections of the valve, and I place on the spindle
another outer hollow spindle extending through all the sections of the
valve except the last one, which latter is attached to the male spindle.
The hollow spindle is at the end screwed on to the male spindle, and has
a collar fixed to it between each section of the valve at increasing |
distances from each section, so that if the spindles be partly unscrewed,
the collar next to the first section of the valve will come in contact with
the said first section and draw it with the hollow spindle, and if the
unscrewing be continued the collar beyond the next section will then
draw that section, and so the sections of the valve will be drawn apart.
The hollow spindle has also a collar formed on it outside the valve, and
by screwing the hollow spindle on to the male spindle, the sections of
the valve are compressed together by the said collar. By this arrange-
ment the sections of the valve may be separated so as to release the
packing rings, and leave them free to expand and fit the valve chest and
thus compensate for wear, and the sections may then be compressed so
as to hold the packing rings between them.
The sections of the valve may be guided together by steady pins,
and the rings are to have cover plates fitted to their sides and backs for
a short distance, so as to cover the joint or cut to prevent the steam
passing. The hollow spindle with its internal male spindle are passed
through the cover of the steam chest, and the male spindle is fitted with
lock nut, so that the valve rings may be released and adjusted at any
time when necessary.
I also apply this arrangement of valve in sections and of spindles to D
slide valves of the class described in the Specification of my Patent,
dated 24th November 1868, No. 3568, extending the packing rings
laterally to a distance equal to that between the ends of the valve, so
that the valve is entirely relieved from steam pressure on its face.
I also apply this mode of packing to pistons. I prefer to make the
piston in say two sections placing the packing ring or rings between
them, and compressing the sections by means of a hollow piston rod
which carries an internal adjusting rod.

page_text: filed by the said William George Beattie in the Great Scal Patent
Office on the 9th February 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
GEORGE BEATTIE, of Nine Elms, in the County of Surrey, Engineer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twelfth day of August, in the year of
our Lord One thousand eight hundred and seventy-five, in the thirty-
ninth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said William George Beattie, Her special licence
that I, the said William George Beattie, my executors, administrators,
and assigns, or such others as I, the said William George Beattie, 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,
excrcise, and vend, within the United Kingdom of Great Britain
and Ireland, the Channel Islands, and Isle of Man, an Invention for
"IMPROVEMENTS IN SLIDE VALVES AND PISTONS," upon the condition (amongst
others) that I, the said William George Beattie, my exccutors or admini-
strators, 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 per-
formed, 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 William George Beattie, 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 accompanying
Drawings and to the letters of referenence marked thereon, that is to
say:
I form the body of pistons and piston valves and D valves of two or
more parts, between which I tightly fix the packing rings, all as herein-

page_text: Figure 1 of the accompanying Drawings is a longitudinal section, and
Figure 2 is a transverse section of a cylindrical or piston slide valve
constructed according to my Invention and placed in the steam chest of
a cylinder; Figure 3 is a transverse section of the valve through one of
the packing rings, and Figure 4 is an end view of the valve.
The valve is formed in 3 sections or parts a, b, c, between which are
placed the packing rings d, d, which also form the wearing surfaces of
the valve. The valve spindle e, e, (Figures 1, 2, 3, and 4), passes
through the valve, and the outer hollow spindle or sleeve ƒ (Figure 1)
is placed over it and screwed on to it as shewn; c¹ is a check nut for
further security. The sleeve has the collars g, y, fixed to it at such
distances from the sections of the valve a and b, that if it be unscrewed
from the spindle e, which may be done by means of a key or spanner
placed on the square end of e, the collar nearest to the section a will
draw that section with the hollow spindle and away from the section b,
which will next be drawn by the second collar away from the section c,
and thus the sections will be separated to allow the packing rings to
expand. The part c is fixed to the inner piston rod e and secured by a
pin y, as shown at Figures 1 and 4. The hollow spindle f has also the
collar fixed on it outside the valve, and by screwing it forciby on to
the spindle c, e, the sections of the valve are compressed, and the
packing rings firmly held between them.
The sections of the valve are guided together by the steady pins j, Ì‚Ì‚
Figures 1, 3, and 4, and the packing rings d, d, Figures 1 and 3, have
the cover plates k, k, placed over them at the parts where they are cut
across. As long as the packing rings & work practically steam-tight
there is no steam pressure on these valves, and they consequently take
little power to work.
Figure 5 is a longitudinal section of my improved D valve placed in
the steam chest of a cylinder; Figure 6 is a transverse section of the
valve and covering jacket; Figure 7 is a plan of back of valve; Figure
8 is a transverse section through the exhaust passage; and Figure 9 is
an end view. The valve is formed with a central body and two end
plates m and n (Figures 5 and 7), and the spindle e passes through the
valve.
The short hollow spindle fis screwed on to the end of the spindle e
and is used to compress the three sections l, m, and n, of the valve

page_text: Secondly. Forming pistons in two parts or sections with piston rings
d between, the said rings a being held tight by means of a nut c', all
operating substantially as set forth.
In witness whereof, I, the said William George Beattie, have
hereunto set my hand and seal, this First day of February, 5
in the year of our Lord One thousand eight hundred and
seventy-six.
WILLIAM GEORGE BEATTIE. (L.S.)