IMPROVEMENTS IN SAFETY VALVES
Year: 1874

page_text: LETTERS PATENT to James Jordan, of Manchester, in the County of
Lancaster, for the Invention of "IMPROVEMENTS IN SAFETY VALVES."
Sealed the 11th June 1875, and dated the 16th December 1874.
PROVISIONAL SPECIFICATION left by the said James Jordan at the
Office of the Commissioners of Patents, with his Petition, on the
16th December 1874.
I, JAMES JORDAN, of Manchester, in the County of Lancaster, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
SAFETY VALVES," to be as follows:-
.
-
My Invention relates to the safety valves which are employed in con-
nection with apparatus used in the generation of steam or in the heating
of water.
In valves which have been constructed previously to my said Inven-
tion the valve part has been turned to the form of a portion of a sphere,
and has been loaded with weights which have acted directly upon the
valve without the interposition of levers, and it is to this class of valve

page_text: that my said Invention principally relates, although it may be found
advantageous to apply my Invention to other descriptions of safety
valves.
In order to increase the area of discharge for the steam or fluid I
cause the loaded valve to rest upon a loose seating, which rests upon the
ordinary fixed seating, and is formed with a passage for the steam to act
upon the loaded valve. The distance which the said loose seating is
permitted to be raised from the said fast seating is regulated by means
of a stop or of stops, so that when further separation of the fast and
loose seatings is arrested the part which corresponds to the ordinary
loaded valve may be raised from the loose seating, whereby two annular
passages for the escape of steam or fluid are provided.
I prefer to form the said loose seating of a spherical or partly of a
spherical form, but, if preferred, the fast seating and upper valve may
be spherically formed, or other variations in the form of the loose
seating may be made.
I also prefer to form or provide the said loose scating with a tube
extending into the steam spaec, or through or nearly through the pillar
of the safety valve, the said tube conveying steam to act upon the
upper valve.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James Jordan in the Great Seal Patent Office
on the 16th June 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
JORDAN, of Manchester, in the County of Lancastor, send grecting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixteenth day of December, in the
year of our Lord One thousand eight hundred and seventy-four, in the
thirty-ninth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said James Jordan, Her special license,
that I, the said James Jordan, my executors, administrators, and
assigns, or such others as I, the said James Jordan, my executors,
administrators, and assigns, should at any time agree with, and no.

page_text: 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
SAFETY VALVES," upon the condition (amongst others) that I, the said James
Jordan, 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
immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said James Jordan, 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 and accompanying Drawings, 'that is to say :-
My Invention relates to the safety valves which are employed in con-
nection with apparatus used in the generation of steam or in the heating
of water.
In valves which have been constructed previously to my Invention
the valve part has been turned to the form of a portion of a sphere, and
has been loaded with weights which have acted directly upon the valve
without the interposition of levers, and it is to this class of valve that
my said Invention principally relates, although it may be found advan-
tageous to apply my Invention to other descriptions of safety valves.
In order to increase the area of discharge for the steam or fluid I
cause the loaded valve to rest upon a loose seating, which rests upon the
ordinary fixed seating, and is formed with a passage for the steam to act
upon the loaded valve. The distance which the said loose seating is
permitted to be raised from the said fast seating is regulated by means
of a stop or of stops, so that when further separation of the fast and
loose seatings is arrested the part which corresponds to the ordinary
loaded valve may be raised from the loose seating, whereby two annular
passages for the escape of steam or fluid are provided.
I prefer to make the said loose seating of a spherical or partly of a
spherical form, but, if preferred, the fast seating and upper valve may
be spherically formed, or other variations in the form of the loose
seating may be made.

page_text: I also prefer to form or provide the said loose seating with a tube
extending into the steam space, or through or nearly through the pillar
of the safety valve, the said tube conveying steam to act upon the upper.
valve.
And in order that my Invention may be well understood I have
appended hereunto a Sheet of Drawings, made about half the full size,
and marked with letters of reference.
Referring in this place to the said Drawings Fig. 1 represents a vertical
section of a complete safety valve constructed in accordance with my.
Invention, and Fig. 2 a cross section on the line A in Fig. 1. In the
said Figures a is the cast-iron pillar; b is the fixed seating which is let
into the upper end of the said pillar; and c is the loose seating. In this
example the said loose scating is made in the form of a hollow ball,-
having two diametrically opposite orifices, around which are raised
facing surfaces which are turned and finished to be spherical curves. A
cup-shaped valve d is fixed to the shell e, which is substantially of the
ordinary form, and is loaded with annular weights f,f, as is usual in this
class of valve. The valve d rests upon the upper spherical surface of,
the said loose seating. A tube g is screwed into a brass or gun metal
bush, which is fixed in a boss h which is cast in a central position
within the pillar a, being connected therewith by means of ribs. The
said bush may be dispensed with if not considered to be necessary. The
upper end of the said tube extends through the loose seating, and is
formed with a collar which acts as a stop to limit the lift of the said.
loose seating, or projections on the said tube may have the same effect.
The amount of lift may be regulated by turning the said tube in one
direction or the other. In the example the said tube is formed in two`
parts, and the lower part extends downwards nearly to the bottom of the
pillar a, but the said tube may be formed in one piece if preferred.
Figs. 3, 4, and 5 illustrate modifications in the forms of the valve and,
seatings. In Fig. 3 the valve d and the fixed seating 6 are spherically
turned and finished, the loose seating being modified in form to suit the
change in the forms of the said valve and loose seating. In Fig. 4 the
fixed seating 6 is formed with a spherically formed concave surface, upon
which the lower edge of the loose seating c rests.
Although I prefer to load the valves in the manner indicated in the
Drawings they may be loaded with weights or springs acting upon the

page_text: said valves through the intervention of levers if such an arrangement be
considered to be more suitable in any case.
If preferred the tube 9 may be fixed to or formed in one piece with
the loose seating.
Having now fully described and indicated the nature of my said Inven-
tion, and the manner in which I carry the same into practical effect, I
would in conclusion have it to be understood that I claim, the safety
valves constructed with two seatings, substantially in the manner set
forth and indicated herein-before and by the accompanying Drawings.
In witness whereof, I, the said James Jordan, have hereunto set
my hand and seal, this Fourteenth day of June, in the year of
our Lord One thousand eight hundred and seventy-five.
Signed and sealed by the said James
Jordan, in the presence of
EDWARD K. DUTTON,
Agent to the Patentee,
3, Princess Street,
Manchester.
JAMES JORDAN. (L.s.).