An 【MEROVED SAFETY VALVE FOR MARINE BOILERS AND OTHER PURPOSES." PROVISIONAL SPECIFICATION
Year: 1871

page_text: LETTERS PATENT to George Watson, of Plaistow, in the County of
Essex, in the Kingdom of England, Engineer, and Hugh Andrews,
of Belfast, in the County of Antrim, in the Kingdom of Ireland,
and also of Newcastle-on-Tyne, in the County of Northumberland,
in the Kingdom of England, Shipowner, for the Invention of "An
【MEROVED SAFETY VALVE FOR MARINE BOILERS AND OTHER PURPOSES."
PROVISIONAL SPECIFICATION left by the said George Watson and
Hugh Andrews at the Office of the Commissioners of Patents,
with their Petition, on the 24th August 1871. ·
-
We, GEORGE WATSON, of Plaistow, in the County of Essex, in the
Kingdom of England, Engineer, and НUGH ANDREWS, of Belfast, in
the County of Antrim, in the Kingdom of Ireland, and also of Newcastle-
on-Tyne, in the County of Northumberland, in the Kingdom of England,
Shipowner, do hereby declare the nature of the said Invention for "An
IMPROVED SAFETY VALVE FOR MARINE BOILERS AND OTHER PURPOSES," to be as
follows:

page_text: We adopt a valve of a spherical or globular or partly spherical or
globular shape, or of any similar form that will allow the valve to
accommodate itself to an inclination while retaining its weight on the
valve seating, which we provide with a groove or recess, or grooves or
recesses cither to hold oil, water, or other lubricating fluid, or to pre-
vent leakage of steam, and lubricate valve. We also furnish the valve
with a guard to prevent dirt falling into the valve seat and to construct
this latter so that no dirt can settle on or adhere to it. We further
attach weights and spindle to the valve by a universal joint.
A lever and chain attached to the valve will allow the escape of steam
when required.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Watson and Hugh Androws in the Great
Scal Patent Office on the 27th January 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, GEORGE
WATSON, of Plaistow, in the County of Essex, in the Kingdom of
England, Engineer, and HUGH ANDREWS, of Belfast, in the County
of Antrim, in the Kingdom of Ireland, and also of Newcastle-on-Tyne,
in the County of Northumberland, in the Kingdom of England, Ship-
owner, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fourth day of August, in the
year of our Lord One thousand eight hundred and seventy-one, in the
thirty-fifth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said George Watson and Hugh Andrews,
Her special licence that we, the said George Watson and Hugh Andrews
our executors, administrators, and assigns, or such others as we, the
said George Watson and Hugh Andrews, 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, usc, exercise, and vend, within the
United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an Invention for "AN IMPROVED SAFETY VALVE FOR
MARINE BOILERS AND OTHER PURPOSES," upon the condition (amongst others)
that we, the said George Watson and Hugh Andrews, our executors or

page_text: administrators, by an instrument in writing under our or one of our,
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 George Watson, for myself and
on behalf of my Co-patentee, 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:-
-
The main object of our Invention is to provide a safety valve which
will retain its weight on the valve seating whatever inclination may be
given to the steam boiler by the rolling or pitching of a ship or otherwise.
Our improved safety valve is composed of a valve of a spherical or
globular or partly spherical or globular shape, or of any similar form
that will allow the valve to accommodate itself to an inclination while
retaining its weight on the valve seating, which we provide with a
groove or recess or grooves or recesses either to hold oil, water, or other
lubricating fluid to prevent leakage of steam and lubricate valve.
We also furnish the valve with a guard to prevent dirt falling into the
valve seat, and construct this latter so that no dirt can settle on or
adhere to it. We attach weights and spindle to the valve by a universal
joint, and a lever and chain attached to a valve allows the escape of
steam, air, gas, water, or other fluid when there is an excess of pressure
or when required.
On the accompanying Sheet of Drawing, Figures 1 and 2 are trans-
verse sections of valves embodying our Invention; similar letters of
reference denote similar parts when such parts appear in each of the
Figures respectively.
We will first describe our improved safety valve as shown, Figure 1..
A is the valve; B, valve seating; b, groove in seating for lubricating
fluid; 6, slope given to valve seating to throw off dirt, water, or any
matter which might choke the valve into the channel K; C, lever and
chain for easing valve; D, oiling or lubricating pipe and cup; E, top
cover of valve box; F, steam chest; G, weights and spindle; H, universal
joint connecting weights with valve; J, guard on valve A to throw off
dit.

page_text: In the safety valve shown Figure 2, the sphere A becomes the .
universal joint, forms valve seating for the valve L, and carries a
casing M for enclosing the weights; this casing being weighted at the
bottom to overcome the friction of motion; N, guide for spindle G.
It will be evident that the spherical form given to the valve shown ♬
Figure 1 will permit the seating to roll around it and thus accommodate
itself to an inclination in any direction, and that the weights being
attached to it by a universal joint will also permit of a small vibration
independent of the movement of the valve seating, the valve being
always kept in the same position on its seating by the gravity of the 1
weight hanging below it.
We have the same movement in the arrangement Figure 2, seating
B rolling round the sphere A, and the valve L kept down plumb upon.
its seating by the constantly vertical position of the weights resulting.
from the free action of the sphere.
The dotted lines, Figures 1 and 2, illustrate the position of the steam
chest and valve seating in relation to the sphere A when at an inclination
of 45 degrees.
We have adopted the casing M to meet the requirement of the Board
of Trade that the weighting of the valve should be protected from 2
unauthorized alterations, and we need scarcely observe that it might
be dispensed with if desired.
The various parts of our improved valve may be made of any suit-
able metal or material and of such relative proportions as experience.
may direct.
Having now described and ascertained the nature of our said
Invention and in what manner the same is or may be performed, we
would have it understood that we claim as secured to us by the
herein-before in part recited Letters Patent,-
Firstly. The use of the combinations of valve, weights, and universal a
joint herein-before described and illustrated Figures 1 and 2 of the
accompanying Sheet of Drawing, substantially as and for the purposes
set forth, whether our improved dirt guard and lubricating arrangement
or any other means of effecting theso objects be employed in conjunction
therewith.
Secondly. The dirt guard and conduit substantially as herein-before
docomibed and illustrated on the Drawing
8

page_text: Thirdly. The oiling grooves or recesses substantially as herein-before
set forth and illustrated on the Drawing.
•
In witness whereof, I, the said George Watson, have hereunto set
•
my hand and seal, this Eighteenth day of January, in the year of
our Lord One thousand eight hundred and seventy-two.
GEORGE WATSON. (L.S.)