Improvements in and relating to the Boilers of Steam Engines.
Year: 1894

page_text: Date of Application, 19th Jan., 1894
Complete Specification Left. 19th Nov.. 1894-Accepted. 19th Jan.. 1895
PROVISIONAL SPECIFICATION.
Improvements in and relating to the Boilers of Steam Engines.
I GERALD WILBRAHAM STUART LENNOX of 39 Baker Street, London, W.,
do hereby declare the nature of this invention to be as follows :-
The object of the present invention is to provide a steam engine which will
need but little attention while at work, so that the constant presence of an attendant
may be dispensed with.
In carrying out my invention, I fit to the boiler of a steam engine, in addition to
the ordinary steam safety valve, a water valve adapted to give way at a pressure
somewhat below that for which the steam safety valve is set. If the pressure of
the steam in the boiler increases beyond the requirements of the work being
performed, there is not at first any escape of steam by the safety valve, but the
level of the water is depressed by the steam formed on the surface thereof, and
there is an overflow by the water escape valve before mentioned. The alteration in
the water level in the boiler, opens, by the aid of a descending float, or other similar
means, a water supply valve through which is delivered to the boiler, water at a
lower temperature.
The admission of this water has the effect of temporarily reducing the steam
pressure, and also of raising again the water level in the boiler, so as to cut off
further water until the steam pressure again becomes excessive.
When the water level in the boiler becomes too low, without an excess of steam
pressure being reached, the alteration of level may be utilized to open a feed water
supply, whereby the deficiency may be made up without bringing into action the
water safety valve arrangement before mentioned.
In this manner, a means of automatically regulating the production of steam in
the boiler is provided, and thereby the engine is enabled to be run for a lengthened
period without attention, save for the necessity of stoking the fires from time to
time.
Dated this 18th day of January 1894.
NEWTON & SON,
Agents for the Applicant.
Improvements in and relating to the Boilers of Steam Engines.
I GERALD WILBRAHAM STUART LENNOX of 39 Baker Street, London, W.,
Gentleman, do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement :-
The object of the present invention is to provide a steam engine which will need
but little attention while at work, so that the constant presence of an attendant
may be dispensed with.
According to my invention, I provide means for automatically regulating the
steam pressure in the boiler, so as to enable the engine to run safely for a lengthened

page_text: period without attention, except when stoking and firing is from time to time
required.
In the accompanying drawing I have shown a vertical steam boiler embodying
my improvements.
A is the boiler, B the fire box, C the ash pit. a are water tubes passing
transversely across the flames from the fire-box.
The automatic regulation of steam pressure is effected as follows :—
G is a pipe open to the boiler below the water level, and extending outside_the
boiler to the valve casing g, which embraces the feed water supply pipe F. This
valve casing contains valves g¹ communicating with the pipe F, and a valve g
communicating with the outside by the aperture g³. These valves are all on the
same spindle, and have an adjustable spring to hold them on their seats.
Should the steam pressure in the boiler become too great, water under pressure
will press on the underside of the valve g³, and overcoming the spring, raise the
valve from its seat, thereby permitting an escape of the water through the
aperture g³.
At the same time, the valves g', which normally balance one another, are raised
by the lifting of the valve 93, and let water at boiler pressure into the coil, driving
therefrom the water contained therein, at a lower temperature, into the boiler by the
pipe f'. This has the effect of at once lowering the steam pressure in the boiler,
and the parts consequently resume their normal condition. The supply of water to
the coil fis derived from a feed pump not shown in the drawing, actuated in the
following manner :-
Within the boiler A, is a float D, attached to the end of a valve rod d. e e are
valves carried by the rod d, which valves work in seats in the pipe E, above the
water level, leading to the water feed pump, not shown. The float D rests on the
surface of the water, and when the level is normal, the valves e remain closed.
Any depression of the water level, however, causes the float D to descend, and to
open the valves e, thereby admitting steam to the pipe E, to work the feed pump.
The pump delivers its water supply by the pipe F, provided with a ball valve ƒ³,
to stop back flow through the coil f, which always contains water, and the pipe fi
to the boiler below the water level, thereby supplying the deficiency of water, and
closing the valves e, by lifting the float D and stopping the feed.
I is an ordinary steam safety valve, and J is an alternative device for allowing a
water safety escape.
It will thus be seen that the steam pressure in the boiler will be maintained
approximately regular without greater attention than it requires to keep up the fires.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The means herein shown and described for automatically effecting the
regulation of steam pressure in boilers, substantially as set forth.
2. The above described means for operating the feed water supply for the purpose
set forth.
DL: 10th ... of November 1804
NEWTON & SON,
Agents for the Applicant.