IMPROVEMENTS IN APPARATUS for REGULATING THE FLOW OF STEAM
Year: 1858

page_text: LETTERS PATENT to James Petrie, of Rochdale, in the County of Lan-
caster, Engineer, for the Invention of "IMPROVEMENTS IN APPARATUS for
REGULATING THE FLOW OF STEAM."
Sealed the 20th August 1858, and dated the 24th February 1858.
PROVISIONAL SPECIFICATION left by the said James Petrie at the
Office of the Commissioners of Patents, with his Petition, on the.
24th February 1858.
I, JAMES PETRIE, of Rochdale, in the County of Lancaster, Engineer, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
APPARATUS. FOR REGULATING THE FLOW OF STEAM," to be as follows:-
My Invention relates, firstly, to regulating the passage of steam to steam
engines by the action of the governor, and for admitting steam thereto from
the boiler. Upon the seat of the "stop valve" I form a series of wings or
vanes which act as guides for the valve to be operated upon by the governor,"
so that the spindle of the former may move within a boss central to both
valves.
Secondly, my Invention refers to a method of communicating motion from
the governor to valves of the above or of other constructions. For this
purpose I employ a bar or bars mounted upon levers (after the manner of
a parallel rule, for instance,) so that .when such levers are caused to turn

page_text: upon their centres the said bars-operate. upon. rollers or other apparatus in
connection with the valve spindle, so as to produce a variable motion of the
said valve.
My improvements above described are also applicable for regulating the
flow of steam into pipes, vessels, or passages, used for heating or other
purposes, in which a steam engine governor is not employed. In such cases
I cause the regulating valve to be actuated by the steam pressure within the
said pipes, vessels, or passages.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said James Petrie in the Great Seal Patent Office on the
23rd August 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
PETRIE, of Rochdale, in the County of Lancaster, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria; by Her Letters
Patent, bearing date the Twenty-fourth day of February, in the year of our
Lord One thousand eight hundred and fifty-eight, in the twenty-first year of
Her reign, did, for. Herself, Her heirs and successors, give and grant unto
me, the said James Petrie, Her especial license that I, the said James Petrie,
my executors, administrators; and assigns, or such others as I, the said
James Petrie, my executors, administrators, and assigns, should at any
time agree with, and no others, from time to time and at all times there-
after 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 "IMPROVE-
MENTS IN APPARATUS FOR REGULATING THE FLOW OF STEAM," upon the.condition,
amongst others, that I,, the said James Petrie, by an instrument. in writing.
under my hand and seal, 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 James Petrie, do hereby declare the
nature of my said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following.
statement and accompanying Drawings (that is to say):
My Invention relates, firstly, to an apparatus for determining by the action

page_text: of the "governor," the quantity of steam that shall pass to the engine, and for
admitting steam thereto by a stop valve; secondly, to a method of communicating
motion from the "governor" to valves of the above or of other construction.
Fig. 1 represents one arrangement of the apparatus in vertical section, and
Fig. 2 is a horizontal section. The valve box or casing is shewn at a, to which
a seat b is attached. This seat is furnished with vanesc extending upwards,
upon which vanes is mounted the regulating valve d, so as to be capable of
being moved upwards or downward thereon. The stop valve is shewn at.c
fitted to a seat upon the same metal as that of the regulating valve, and
mounted upon a spindle f, which passes through a central boss formed with
the vanes c.
The upper end of the spindle f is provided with a screw and
handle g, by which the stop valve may be opened or closed, so as to regulate
the flow of steam from the boiler through the pipe h, and it is prevented from
turning upon its centre by means of an arm i, a forked end of which takes on
to a feather formed upon the casing a.
The method of communicating
motion from the governor, and constituting a separate feature in my improve-
ments, is as follows:-The valve d is furnished with a cross head k, which has
a boss sliding upon the spindle f; to this boss is fixed by an adjusting screw
a thimble m carrying rollers n, which project into slots formed within bars o.
These bars hang upon levers p, the axis s of one of which passes through a
stuffing box 9, and is on the outside provided with a lever r, connected to the
governor " by any suitable means. Upon the axis s being turned, the bars o
will be carried upward or downward with a parallel motion, and acting upon the
rollers n, will cause the valve d to open or close by sliding upon the spindle f.
In order to prevent the valve from being pressed with force upon its seat the
bars o are elongated, so as to arrive in contact with the casing when the steam
.66
is shut off.
Fig. 3 represents in vertical section a modification of the improvements.
The box or casing is at a, and the regulating valve at d, moving upon vanes c
formed upon the valve seating b, but in this instance it is mounted upon a
spindle f, which moves in a guide f✶ at its lower end. The stop valve g in
this case is above, but fitted as before to a seat upon the same metal as that
of the regulating valve, and its spindle e moves in a boss t formed upon the
vanes c. The parallel bar o, for moving the regulating valve, passes through .a
slot formed in the spindle f, and acts upon a roller u placed therein; it is
jointed to levers p, as in the other instance, and therefore acts by a similar
parallel motion.
Having thus described and ascertained the nature of my said Invention, and
the manner in which the same is to be performed, I desire it to be understood

page_text: that I claim, as secured to me under the above in part recited Letters
.Patent,―
Firstly, the combination of the regulating valve shewn and described, with
a stop valve, the two being placed on the same central line.
Secondly, the employment of the parallel bar for communicating motion
from the governor to valves of the above or of other construction.
In witness whereof, I, the said James Petrie, have hereunto set 'my
hand and seal, this Twentieth day of August, in the year of our Lord
One thousand eight hundred and fifty-eight.
JAMES PETRIE. (L.S.)