AN IMPROVED STOP Valve for Steam Pipes.”
Year: 1875

page_text: LETTERS PATENT to William Robert Pether, of Battersca, and
William Juxon Hesketh, of Putney, both in the County of Surrey,
for the Invention of “AN IMPROVED STOP Valve for Steam Pipes.”
"
PROVISIONAL SPECIFICATION left by the said William Robert Pether
and William Juxon Hesketh at the Office of the Commissioners
of Patents, with their Petition, on the 28th October 1875.
We, WILLIAM ROBERT PETHER, of Battersea, and WILLIAM JUXON
HESKETH, of Putney, both in the County of Surrey, do hereby declare
the nature of the said Invention for "AN IMPROVED STOP VALVE FOR
STEAM PIPES," to be as follows :—
Our Invention relates to on improved stop valve for steam pipes, and
is chiefly designed for instantaneously shutting off the steam pipe from
a marine or other boiler on the event of failure of any part of the engine.
It consists of a cap or plate fitted to close against the mouth of the
steam pipe which usually projects some distance within the shell of the
boiler. Both the cap or disc and the mouth of the pipe are accurately

page_text: faced so as to make a tight closure. The cap is provided with guides
working on the steam pipe, or it may be otherwise fitted. In its normal
position the valve or cap is held back from the steam pipe by a lever
arm connected to it and fixed on a spindle passing through a bearing
provided with a suitable packing and gland, and fixed to the shell of the
boiler. On the outer end of this spindle is a lever handle held up by a
pin or otherwise. This handle will fall on being released and close the
valve instantaneously, the steam pressure in the boiler assisting to close
the valve.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Robert Pether and William Juxon
Hesketh in the Great Seal Patent Office on the 28th April
1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, WILLIAM
ROBERT PETHER, of Battersea, and WILLIAM JUXON HESKETH, of
Putney, both in the County of Surrey, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-eighth day of October, 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 us, the said William Robert Pether and
William Juxon Hesketh, Her special licence that wo, the said William
Robert Pether and William Juxon Hesketh, our executors, admini-
strators, and assigns, or such others as we, the said William Robert
Pether and William Juxon Hesketh, our 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 "AN IMPROVED STOP VALVE FOR STEAM
PIPES," upon the condition (amongst others) that we, the said William
Robert Pether and William Juxon Hesketh, our executors or adminis-
trators, by an instrument in writing under our, or their, or one of
their hands and seals, should particularly describe and ascertain the

page_text: 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 wc, the said William Robert Pether and
William Juxon Hesketh, do hereby declare the nature of our 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 Sheet of Drawings,
and to the letters and figures marked thereon, that is to say :-
Our Invention relates to an improved stop valve for steam pipes, and
is chiefly designed for instantaneously shutting off the steam pipe from
a marine or other boiler in the event of failure of any part of the engine.
It consists of a cap or plate fitted to close against the mouth of the steam
pipe which usually projects some distance within the shell of the boiler.
Both the cap or disc and the mouth of the pipe are accurately faced so
as to make a tight closure. The cap is provided with guides working on
the steam pipe, or it may be otherwise fitted. In its normal position
the valve or cap is held back from the steam pipe by a lever arm
connected to it and fixed on a spindle passing through a bearing
provided with a suitable packing and gland and fixed to the shell of the
boiler. On the outer end of this spindle is a lever handle held up by a
pin or otherwise. This handle will fall on being released and close the
valve instantaneously, the steam pressure in the boiler assisting to close
the valve
Figure 1 is a section or
DONGH SHOWING A DUCK VICW OF Ghe
stop valve; Figures 2, 3, and 4 are sections on lines 1-1, 2-2, and 3-3
respectively, showing different views of the valve; Figures 5 and 6 show
views of two modified forms of valve.
A is the portion of the steam pipe which projects within the boiler B.
The mouth a of this pipe is turned to form a seat for the valve c, which
is a disc or cap with a plane, conical, or hemispherical face c'; D are
guides for the valve c. They are fixed on or formed in one with said
valve, and their inner surface is turned cylindrical to fit and slide outside
or inside the circumference of the steam pipe A; E is a lever arm

page_text: passing through a slot in a stud F on the back of valve c. This lever E
is keyed on a rock shaft G which passes through a bearing H fixed to
the boiler shell provided with a packing and gland to prevent leakage;
I is a lever handle fixed on the outer end of shaft G, which is held up
by a pin or other readily removable support, by withdrawing which the
lever will fall by its own weight, and the valve aided by the steam
pressure will be instantaneously closed.
The peculiar characteristic of this improved stop valve is its
instantaneous action which is obtained by the movement of the valve in
a direction coinciding with the centre line of the steam pipe directly
against the mouth of the latter as above mentioned.
Having described the nature of our Invention, and the manner of
performing the same, we declare that what we claim as our Invention
to be protected by the herein-before in part recited Letters Patent
is,-
1st. The improved stop valve herein described, applied and operating
as set forth.
2nd. The combination with the improved stop valve of the rock
shaft and lever arms, substantially as and for the purpose specified.
In witness whereof, we," the said William Robert Pether and
William Juxon Hesketh, have hereunto set our hands and seals,
this Twenty-sixth day of April, in the year of our Lord One
W. R. PETHER.
(L.S.)
W. J. HESKETH. (L.S.)