IMPROVEMENTS IN THE CONSTRUCTION OF CONE OR PLUG VALVES
Year: 1871

page_text: LETTERS PATENT to William Hollinshead, Engineer, of Peckham,
in the County of Surrey, for the Invention of "IMPROVEMENTS IN
THE CONSTRUCTION OF CONE OR PLUG VALVES."
Sealed the 7th October 1871, and dated the 10th April 1871.
PROVISIONAL SPECIFICATION left by the said William Hollinshead
at the Office of the Commissioners of Patents, with his Petition, on
the 10th April 1871.
I, WILLIAM HOLLINSHEAD, Engineer, of Peckham, in the County of
Surrey, do hereby declare the nature of the said Invention for "Iм-
PROVEMENTS IN THE CONSTRUCTION OF CONE OR PLUG VALVES," to be as
follows:-
My improvements are specially applicable to valves which are used
as change valves for purifiers, by-pass valves, and valves for all other
purposes required in gas apparatus and works when constructed or
formed with a conical plug, having subdivisions and gearing for raising
or slightly elevating the plug when necessary, and consist of so forming

page_text: the working surfaces by means of recesses in the bodies of the valves
and of recesses or openings or ports in the plugs that the working
surfaces are protected or out of contact with the gas in all positions
of the plugs when set in their places which has not been the case
heretofore.
My improvements are also applicable to valves for any other purpose
when constructed as herein described.
The Invention is illustrated on the accompanying Drawing, Fig. 1
The
being a plan; Fig. 2, vertical section; Fig. 3, horizontal section.
lettered description being as follows:-, body or valve; b, conc plug ;
c, recesses; d, bearing surfaces surrounding the ports; c, flange pipes
for connection to purifiers; %, cover to valve; 9, 9, 9, illustrates the
gearing for raising or slightly elevating the plug when necessary and
changing the valve.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Hollinshead in the Great Seal Patent
Office on the 10th October 1871.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
HOLLINSHEAD, Engineer, of Peckham, in the County of Surrey, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Tenth day of April, in the year of our
Lord One thousand eight hundred and seventy-one, in the thirty-
fourth year of Her reign, did for Herself, Her heirs and successors,
give and grant unto me, the said William Hollinshead, Her special
licence that I, the said William Hollinshead, my executors, adminis-
trators, and assigns, or such others as I, the said William Hollinshead,
my executors, administrators, and assigns, should at any time agrec
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, au Invention for "IM-
PROVEMENTS IN THE CONSTRUCTION OF CONE OR PLUG VALVES," upon the
condition (amongst others) that I, the said William Hollinshead, my

page_text: 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.
NOW KNOW YE, that I, the said William Hollinshead, 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 and figures marked thereon, that is to
say :-
This Invention relates to improvements in the construction of conical
plug valves, but more especially to those used or connected with
apparatus for the manufacture of gas, as centre change valves, by-pass
valves, and shut-off valves.
The improvements consist in recessing those parts of the working
surfaces which are liable to be at any time exposed to the action of the
gas, or, in other words, of so forming the working surfaces that no part
of them is at any time exposed to the action of the gas. For this
purpose the body of the valve on the internal working face is recessed
or chambered out at all points, except the bearing surface, actually
necessary. The true working surface, therefore, projects beyond the
recesses and forms a ring around each recess and port, varying in width
with the size of valve. The plug is formed with its bearing or working
surfaces accurately corresponding with and fitted to the working surfaces
on the body of the valve.
In order that the foregoing may be more readily understood Drawings
are attached hereto, of which the following is a description :-The whole
of the Figures are horizontal sections of the various forms of valves
especially adapted to gas purposes, No. 1 being a through way and stop
valve; No. 2 is a three-way valve for connecting two gassholders or other
similar apparatus; No. 3 is a valve for acting as a by-pass, shut-off
valve, or for passing the gas through two series of vessels at once;
No. 4 is a by-pass valve having the outlet of the plug through the
bottom; No. 5 is a by-pass valve with the outlet of the plug at the
side; No. 6 is a centre change valve for two purifiers, adapted for
working both or either of them; No. 7 is a centre-change valve for three

page_text: purifiers, suitable for working either one, two, or three, in succession;
No. S is a centre change valve for four purifiers, for working three
purifiers in succession, one being always shut off; and No. 9 is a centro
change valve for four purifiers, which admits of the working of one,
two, three, or the whole four purifiers in succession.
In each of the Figures 6, 7, 8, and 9, the letter A indicates the inlet.
In all the Figures the parts colored blue are in section, while the
portions of a darker hue shew the recesses before mentioned, the
openings in the plugs and bodies of the valves remaining uncolored.
The arrows point to the direction in which the gas is flowing.
The valves are provided with suitable gearing, indices, and pointers,
for opening, closing, and indicating the direction of the current of gas.
The gearing is also so arranged that the plug may be relieved or cased
for the greater facility of changing its position.
The improvements here described are also applicable to plug valves,
cocks, hydrants, &c. used for the transmission of water or other fluids.
Having now described and particularly set forth the nature of this
Invention, I would observe in conclusion that I do not confine or restrict
myself to the precise details or arrangements which I have described
or referred to, as variations may be made therefrom without deviating
from the principles or main features of this Invention; but what I
consider to be novel and original, and therefore claim as the Invention
secured to me by the herein-before in part recited Letters Patent is,
for so arranging the internal surfaces of conical plug valves that no part
of such surfaces, where it is necessary that they shall work against each
other so as to be gas-tight, shall be liable at any time to be in contact
with the gas, substantially as herein described.
In witness whereof, I, the said William Hollinshead, have hereunto
set my hand and scal, this Tenth day of October, in the year of
Lowl Ona thousand sight hundred and covanty are