Improvements in and relating to Steam Generators.
Year: 1893

page_text: Date of Application, 22nd Dec., 1893
Complete Specification Left, 21st Sept., 1894-Accepted, 22nd Dec., 1894
•
PROVISIONAL SPECIFICATION.
Improvements in and relating to Steam Generators.
I, PAUL DOUDart de la GrÉE, of 95 Boulevard Beaumarchais, Paris, in the
Republic of France, do hereby declare the nature of this invention to be as
follows:-
My invention relates to steam generators.
Generators with instantaneous vaporization have for their principal object to
dispense with a reservoir of liquid permanently subjected to heat, and to vaporize
the liquid supplied to them for this purpose, only in proportion to the requirements
of the engine.
This has led to the operation being effected by injecting successively and.
separately into the boiler the liquid necessary for each stroke of the piston, by
means of a force pump actuated by the engine itself.
According as more or less liquid is supplied to the generator the latter gives
more or less pressure and force which it transmits immediately to the piston. As
the pump actuated by the engine forces a quantity of liquid equal in each
revolution, that is to say for each stroke of the piston, the force is regulated
by limiting more or less its useful effect by the aid of a return flow of liquid
produced at variable intervals of time. The generator has heretofore remained
in permanent communication with the cylinder and the pressures therein are
continually variable according to the greater or smaller quantities injected into
the same.
This mode of operation presents inconveniences and may even be dangerous in
case the engines, such as those of vehicles, are designed to move at velocities which
vary frequently within wide limits.
The quantity of liquid to be supplied for producing the same force varies with
the velocity at which the engine moves. From this it follows that the driving
mechanism must be manipulated each time the velocity of the motion changes, for
as the pump always delivers the same quantity in every revolution it is needful to
reduce its play when the velocity increases and to augment it when the velocity
diminishes.
Given the volume of water which it is necessary to inject in each stroke for
supplying the engine, at the moment when the greatest resistances have to be
overcome, corresponding to the smallest velocity and the greatest pressure of the
engine, with maximum power which the furnace can produce, if a pump having a
smaller capacity than this volume is used, it is needful to employ at this moment an
auxiliary injector.
But independently of the inconvenience of this manipulation which takes place
more or less frequently according as the capacity of the pump is more or less below
the maximum, this mode of operation also possesses the more serious inconvenience
that the quantity which the furnace can support is liable to be exceeded with the
injector and that the generator will consequently be cooled and then discontinue to
work for some time, perhaps just at the moment when it is most needed.
If, in order to obviate this inconvenience, the pump is given a capacity equal at
least to the maximum volume of liquid to be vaporized at the smallest velocities
without exceeding the power of the furnace it will in this case be necessary to
reduce the useful effect of the pump each time these exceptional conditions of
motion do not obtain. But besides the inconvenience of a continual manipulation
there is here a real danger. A false movement of the attendant, a moment of
inattention when the motion changes from some cause or other, may allow the pump

page_text: to continue the supply of the same maximum volume of water for some revolutions
at the new velocity and may consequently give rise to irregularities in the motion
of the engine.
With the object of remedying these inconveniences I utilize with instantaneous
generators the operation of pistons in cylinders of ordinary generators, by keeping
them on the one hand always at the same maximum pressure which they cannot
exceed, and on the other hand by regulating automatically the admission of the
liquid into the generator in such a manner that it will take only the quantity
necessary for remaining always at this pressure whether the steam which it produces
is or is not used; and I control the engine by opening more or less the orifices
setting the cylinders in communication with the generator.
For the feed of the generator the passage between the serpentine and the slide
valve or valves of the engine is not kept open in a permanent manner. Ou the
contrary in this passage the steam admission is controlled by the operating lever
and by the brake. The steam introduced into the cylinder is taken from the
serpentine as in the case of an ordinary boiler.
In order that under these conditions the operation may take place in the
serpentine it is necessary that the latter shall receive automatically the liquid in
proportion as the steam which is generated therein passes to the cylinder, and that
this introduction of the liquid may be automatically regulated in such a manner
that only the quantity necessary for maintaining, the maximum pressure at which
the movement is to take place will enter the serpentine by the action of the
pump.
With this object the feed pump which introduces the liquid into the serpentino
is so arranged that the orifice for the admission of the liquid to the serpentine
closes of itself and prevents the admission as soon as the pressure in the
serpentine exceeds the fixed maximum and in order that at this moment on the
contrary the orifice for the return flow of the liquid to the feed reservoir affords it
a free passage.
This closing under the action of the maximum pressure which is not to be
exceeded may be obtained by the aid of any known mechanical means. By way of
example I will describe which may be advantageously employed for this purpose.
The arrangement is such that the feed pump forces the liquid against the two
orifices inlet of the serpentine and return passage to the reservoir. The two
orifices are closed by flap, ball, slide or other valves opening in the direction of the
push caused by forcing action of the pump. The flap, ball, slide or other valve,
which closes the return passage to the reservoir is kept closed by a spring or the
like which is so adjusted that the valve allows an entirely free passage only at the
moment when it receives a force equal to the maximum pressure which is not to be
exceeded.
Under these circumstances the pump injects into the serpentine a first quantity
of liquid which is vaporized instantaneously. As soon as the quantity vaporized
has reached the fixed maximum pressure the flap, ball, slide or other valve which
closes the first of the aforesaid orifices receives from the interior of the serpentine
a greater power than that which the forcing action encounters in the flap, ball, slide
or other valve which closes the second orifice under the action of its spring.
Accordingly the liquid discontinues to be introduced into the serpentine and flows
out through the second orifice back to the reservoir. The return passage to
the reservoir and its flap, ball, slide or other valve may, according to circum-
tances, be placed in the piston of the feed pump, which piston in this case
forces the liquid into the serpentine only when the pressure in the latter is
smaller than that of the spring which keeps the interior passage of the piston
closed..
Between the two flap, ball, slide or other valves I therefore establish a kind of
flapping action which does not perhaps at certain moments cause one or the other
passage to be completely intercepted, but which regulates the intensity of the
current by the alternating contractions which it produces.

page_text: For facilitating the regularity of this action I may use, in lieu of a single-acting
pump, a double acting pump or two pumps acting together in a suitable manner and
so regulate them that their movements may be synchronous with those of the piston
or pistons.
In case the size of the serpentine is too small for rendering this action steady I
may provide between the outlet extremity of the serpentine and the steam passage
a box of spherical or other shape capable of resisting very great pressures and
designed to collect the vaporized steam, thereby providing for the capacity necessary
for maintaining the action before alluded to. This box may form the upper part
of the cap used and it is under the direct action of the furnace like the serpentine
itself.
A spring which keeps the orifice for the return to the reservoir closed is adjusted
to the desired power by a pressing screw held by stop notches or by means of keys
or wedges upon which it is forced, which enables its tension to be verified and
rectified by means of a small pressure gauge placed upon the serpentine or upon the
adjoining box.
Instead of a spring regulated by a pressing screw I may of course employ any
other known mechanical means for bringing the desired power to bear upon the
valve of the second orifice and maintain and regulate its action by other known
means equivalent to a pressing screw. I may also employ a spring constituted by
a sheath of a box containing air which is more or less compressed therein by means
of a small hand pump, thereby enabling the maximum pressure to be instantly
augmented during the movement.
A device arranged on this principle comprises an indiarubber sheath taken
between two armatures which are adapted to move with little friction in a cylinder.
When air is introduced through an orifice in the end of this cylinder a ball valve
uncovers the
may
and closes it again under the interior pressure.
passage
compress air by means of a small hand pump such as is employed for inflating
pneumatic tyres of velocipedes.
I
thus
According as more or less pressure is produced in the sheath it expands more or
less, thereby pushing one of said armatures which in its turn pushes a rod
terminating in a valve of the beforementioned second orifice.
When the furnace possesses a regulator the latter may be articulated to one
side of the rod, and an aperture in the side of the cylinder extending beyond
the range of action of the spring provides for the free movement of this
articulation.
If desired I may also dispense with the said armature and use a disc adapted
to slide with little friction in the cylinder, which disc is at the end of the said
rod may if necessary have on the side of the indiarubber the form of the said
armature.
The spring used together with a pressing screw or with compressed air regulating
the automatic action of the feed and of the pressure offers this advantage that while
obviating unexpected irregularities it does not prevent the attendant at a given
moment from augmenting his maximum pressure by increasing the resistance of
the spring. If in doing so he exceeds the power of this furnace he will no doubt
have the same inconvenience as regards the momentary irregularities hereinbefore
alluded to, but this will take place only under circumstances in which it is desired
and forseen, such as for instance when ascending a hill which requires greater
power than that furnished by the generator, the said hill being then ascended by
short movements between which short stoppages take place.
When this device is not to be used and it is desired to operate with the
serpentine in permanent communication with the slide valves of the cylinders I
obviate the danger of unforseen irregularities by providing in the box of the
slide valves an escape orifice either communicating with the open air or with a
condenser, this orifice being closed by a flap, ball, slide or other valve adjusted
to the desired maximum. pressure by means of a spring similar to those before
mentioned.
•

page_text: When under these circumstances the serpentine produces a pressure exceeding
the fixed maximum pressure, the steam instead of giving its whole power to the
cylinder opens the valve and passes out through its orifice as long as it does not
fall to this pressure, at which moment the spring of this valve closes the latter
again and allows the operation to continue.
In order to have the serpentine always ready for operation and enable steam at
the fixed pressure to be taken at any moment whether the engine operates already
or whether it stops, I utilize the pressure in the serpentine for permanently
enabling the steam to perform work, and for obtaining a feed independently of the
movement of the engine. For this purpose I arrange upon the serpentine a steam
pipe by which a feed pump may be actuated.
This pump, owing to the automatic return flow of the water, introduces into the
serpentine only the quantity of water necessary for always maintaining the fixed
pressure, the excess passing through the water return pipe.
By reason of this particular arrangement the serpentine is always ready for
operation.
I may at any moment set the engine in motion by simply opening the passage
between the serpentine and the cylinder of the engine without any necessity for
causing the serpentine to work again by injecting water by means of a hand pump
in order to effect a fresh operation after the stoppage of the engine.
Such an injection is necessary only when the operation is to be started for the
first time after the cooling of the serpentine, and even that will not be needful if
at the time of the cooling a sufficient quantity of liquid has remained in the
serpentine so as to become vaporized by the first heating and to cause the operation
of the valve.
It may be observed that when use is made for the generator of a furnace
requiring power either for injecting fuel into the same or for any other purpose
this arrangement also enables the power necessary for the furnace, to be taken in
a regular and permanent manner.
The automatic feed is regulated for injecting liquid into the generator while the
pressure in this generator is not maintained or brought back to the maximum
pressure which is regulated by the spring. By this means I avoid accidental
irregularity of the engine through too abundant an injection at a given movement
and also the swamping and, cooling of the generator which are in most cases the
consequence.
But this combination, while diminishing the risks of swamping and cooling of the
generator, is not sufficient for causing them to disappear altogether. It may in
fact happen that a greater quantity of steam than that which the furnace has the
power to supply is led at a given movement into the cylinder of the engine at a
greater velocity and therefore at a smaller pressure than that fixed for the
generator. In this case the pressure can evidently not be maintained in the
generator at the fixed maximum at which it should be kept. The liquid being
vaporized in proportion to its passage and being then removed directly for
doing work in the cylinders, whilst the furnace is not sufficient for the expenditure
of steam, the pressure will be lowered in the generator, and the feed continuing,
the generator will be swamped and cease to operate after having furnished to the
cylinders for the last strokes only steam mixed with boiling water.
For obviating this inconvenience I place either at the outlet pipe of the
generator or only at the inlet of the special pipe for the independent feed or ball,
Hap or other valve maintained by a spring or the like adjusted by means of a
screw or other means, as described for the feed regulating valve, to a very small
pressure, such as 2, 1 or 1 kilogramme or even less, in short to the pressure at
which the engine must not work. The steam can therefore leave the generator for
performing work only when it has at least this pressure. When it tends to descend
below, the valve tends to close again and as the velocity of the feed pump
diminishes the quantities of liquid injected is lessened.
The serpentine therefore never takes a greater quantity of liquid than that which

page_text: the power of the furnace can vaporize at the fixed minimum pressure. The engine
works between a maximum aud a minimum regulated beforehand.
This combination also enables the operation of the serpentine boiler and of the
independent feed to be easily started by arranging the boiler in such a manner that
when it is cold it still contains a certain quantity of liquid, which is achieved by
keeping at a higher level either the reservoirs or the feed regulating chamber
which encloses the valve for the return passage of the liquid, and by giving in the
latter case to the regulating chamber a sufficient capacity so that when the levels
are established the serpentine contains liquid up to the desired point.
In this manner the serpentine even without a preliminary feed will always have
liquid enough to enable a sufficient pressure to be raised for causing the action of
the independent feed.
Dated this 22nd day of December 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents-for the Applicant.
COMPLETE SPECIFICATION.
Improvements in and relating to Steam Generators.
I, PAUL DOUDart de la GrÉE, of 95 Boulevard Beaumarchais, Paris, in the
Republic of France, 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 :—
My invention relates to steam generators.
Generators for the instantaneous vaporization of liquid have for their principal
object to dispense with a reservoir of liquid permanently subjected to heat, and to
vaporize the liquid supplied to them for this purpose, only in proportion to the
requirements of the engine.
This has led to the operation being effected by injecting successively and
separately into the boiler the liquid necessary for each stroke of the piston, by
means of a force pump actuated by the engine itself.
According as more or less liquid is supplied to the generator the latter gives
more or less pressure and force which it transmits immediately to the piston. As
the pump actuated by the engine forces a quantity of liquid equal in each
revolution, that is to say for each stroke of the piston, the force is regulated by
limiting more or less its useful effect by the aid of a return flow of liquid
produced at variable intervals of time. The generator has heretofore remained in
permanent communication with the cylinder and the pressures therein are
continually variable according to the greater or smaller quantities injected into the
same.
This mode of operation presents inconveniences and may even be dangerous in
case the engines such as those of vehicles, are designed, to move at velocities which
frequently vary within wide limits.
The quantity of liquid to be supplied for producing the same force varies with
the velocity at which the engine moves. From this it follows that the driving
mechanism must be manipulated each time the velocity of the motion changes, for
as the pump always delivers the same quantity in every revolution it is necessary
to reduce its play when the velocity increases and to augment it when the velocity
diminishes.
Given the volume of water which it is necessary to inject in each stroke for
supplying the engine, at the moment when the greatest resistances have to be
overcome, corresponding to the smallest velocity and the greatest pressure of the
engine, with the maximum power which the furnace can produce, of a pump having
a smaller capacity than this volume is used, it is necessary to employ at this
moment an auxiliary injector.
1

page_text: But independently of the inconvenience of this manipulation which takes place
more or less frequently according as the capacity of the pump is more or less
below the maximum, this mode of operation also possesses the more serions
inconvenience that the quantity which the furnace can support is liable to be
exceeded with the injector and that the generator will consequently be cooled and
then discontinue to work for some time, perhaps just at the moment when it is
most needed.
If, in order to obviate this inconvenience, the pump is given a capacity equal at
least to the maximum volume of liquid to be vaporized at the smallest velocities
without exceeding the power of the furnace it will in this case be necessary to
reduce the useful effect of the pump each time these exceptional conditions of
motion do not obtain. But besides the inconvenience of a continual manipulation
there is here a real danger. A false movement of the attendant, a moment of
inattention when the motion changes from some cause or other, may allow the
pump to continue the supply of the same maximum volume of water for some
revolutions at the new velocity and may consequently give rise to irregularities n
the motion of the engine.
With the object of remedying these inconveniences I maintain the instantaneous
generators at a maximum pressure which they cannot exceed, and on the other
hand I automatically regulate the admission of the liquid to the generator so that
it takes only the quantity necessary for remaining always at this pressure whether
the steam which it produces is or is not used; and I control the engine by opening
more or less the orifices communicating between the cylinders and the generatur.
For the feed of the generator the passage between the serpentine and the slide
valve or valves of the engine is not kept open in a permanent manner. On the
contrary in this passage the steam admission is controlled by the operating lever
and by the brake. The steam introduced into the cylinder is taken from the
serpentine as in the case of an ordinary boiler.
In order that under these conditions the operation may take place in the
serpentine it is necessary that the latter shall receive automatically the liquid in
proportion as the steam which is generated therein passes to the cylinder, and
that this introduction of the liquid may be automatically regulated in such a
manner that only the quantity necessary for maintaining, the maximum pressure
at which the movement is to take place will enter the serpentine by the action of
the pump.
With this object the feed pump which introduces the liquid into the serpentine
is so arranged that the orifice for the admission of the liquid to the serpentine
closes of itself and prevents the admission as soon as the pressure in the
serpentine exceeds the fixed maximum and in order that at this moment on the
contrary.the orifice for the return flow of the liquid to the feed reservoir affords
it a free passage.
In the accompanying drawing, I have shown how the invention may be
conveniently and advantageously carried into practice, the figures of said drawing
being hereinafter referred to.
The closing under the action of the maximum pressure which is not to be
exceeded may be obtained by the aid of any known mechanical means. By way
of example. I will describe the device shown in Figure 2 which may be advan-
tageously employed for this purpose. The arrangement is such that the feed
pump forces the liquid against the two orifices, A. the inlet of the serpentine
and B the return passage to the reservoir. The two orifices are closed by flap,
ball, slide or other valves opening in the direction of the push caused by forcing
action of the pump. The flap, ball, slide or other valve, which closes the return
passage to the reservoir is kept closed by a spring R or the like which is so
adjusted that the valve allows an entirely free passage only at the moment when it
receives a force equal to the maximum pressure which is not to be exceeded.
Under these circumstances the pump injects into the serpentine a first quantity
of liquid which is vaporized instantaneously. As soon as the quantity vaporized

page_text: has reached the fixed maximum pressure the flap, ball, slide or other valve which
closes the first of the aforesaid orifices A receives from the interior of the
serpentine a greater power than that which the forcing action encounters in the
flap, ball, slide or other valve which closes the second orifice B under the action of
its spring. Accordingly the liquid discontinues to be introduced into the serpentine
and flows out through the second orifice B back to the reservoir. The return
passage B to the reservoir and its flap, ball, slide or other valve may, according to
circumstances, be placed in the piston of the feed pump, which piston in this
case forces the liquid into the serpentine only when the pressure in the latter
is smaller than that of the spring which keeps the interior passage of the piston
closed.
Between the two flap, ball, slide or other valves I therefore establish a kind of
flapping action which does not perhaps at certain moments cause one or the other
passage to be completely intercepted, but which regulates the intensity of the
current by the alternating contractions which it produces.
For facilitating the regularity of this action I may use, in lieu of a single-acting
pump, a double acting pump or two pumps acting together in a suitable manner and
so regulate them that their movements may be synchronous with those of the piston
or pistons.
In case the size of the serpeutine is too small for rendering this action steady I
may provide between the outlet extremity of the serpentine and the steam
passage a box of spherical or other shape capable of resisting very great pressures
and designed to collect the vaporized steam, thereby providing for the capacity
necessary for maintaining the action before alluded to. This box may form the
upper part of the cap used and it is under the direct action of the furnace like
the serpentine itself.
A spring R (Figure 2) which keeps the orifice for the return to the reservoir
closed is adjusted to the desired power by a screw held by stop notches or by
means of keys or wedges upon which it is forced, which enables its tension to he
verified and rectified by means of a small pressure gauge placed upon the
serpentine or upon the adjoining box.
Instead of a spring regulated by a pressing screw I may of course employ
any other known mechanical means for bringing the desired power to bear upon the
valve of the second orifice and maintain and regulate its action by other known
means equivalent to a screw. I may also employ a spring constituted by a sheath
or a box containing air which is more or less compressed therein by means of a
small hand pump, thereby enabling the maximum pressure to be instantly augmented
during the movement.
Figure 1 represents a spring arranged on this principle. The indiarubber
sheath abcdefgh is held between two cup-shaped pieces A B. CD which are
adapted to move with little friction in a cylinder M N P Q. When air is
introduced through an orifice O in the end of this cylinder a ball valve O' uncovers
the passage and closes it again under the interior pressure. I may thus compress
air by means of a small hand pump such as is employed for inflating pneumatic
tyres of velocipedes.
According as more or less pressure is produced in the sheath it expands more or
less, thereby moving one of the said cup-shaped piece C D which in its turn
operates a rod T terminating in the valve B of Figure 2.
When the furnace possesses a regulator the latter may be articulated to one side.
of the rod, and an aperture in the side of the cylinder extending beyond the
range of action of the, spring provides for the free movement of this articulation.
If desired I may also dispense with the said cup-shaped piece CD and use a
disc F K adapted to slide with little friction in the cylinder, which disc is arranged
at the end of the said rod T, and may if necessary have on the side of the
indiarubber the forin of the said cup-shaped piece CD.
The spring used together with a screw or with compressed air regulating the
automatic action of the feed and of the pressure offers this advantage that while

page_text: obviating unexpected irregularities it does not prevent the attendant at a given
mo:nent from augmenting his maximum pressure by increasing the resistance of the
spring. If in doing so he exceeds the power of his furnace he will no doubt
have the same inconvenience as regards the momentary irregularities hereinbefore
alluded to, but this will take place only under circumstances in which it is desired
and foreseen, such as for instance when ascending a hill which requires greater
power than that furnished by the generator, the said hill being then ascended by
short movements between which short stoppages take place.
In order to have the serpentine always ready for operation and enable steam at
the fixed pressure to be taken at any moment whether the engine operates already
or whether it stops, I utilize the pressure in the serpentine for permanently enabling
the steam to perform work, and for obtaining a feed independently of the movement
of the engine. For this purpose I arrange upon the serpentine a steam pipe by
which a feed pump may be actuated.
This pump, owing to the automatic return flow of the water, introduces into the
serpentine only the quantity of water necessary for always maintaining the fixed
pressure, the excess passing through the water return pipe.
By reason of this particular arrangement the serpentine is always ready for
operation.
I may at any moment set the engine in motion by simply opening the passage
between the serpentine and the cylinder of the engine without any necessity for
causing the serpentine to work again by injecting water by means of a hand pump
in order to effect a fresh operation after the stoppage of the engine.
Such an injection is necessary only when the operation is to be started for the
first time after the cooling of the serpentine, and even that will not be needful if at
the time of the cooling a sufficient quantity of liquid has remained in the serpentine
so as to become vaporized by the first beating and to cause the operation of
the valve.
It may be observed that when use is made for the generator of a furnace
requiring power either for injecting fuel into the same or for any other purpose
this arrangement also enables the power necessary for the furnace, to be taken in a
regular and permanent manner.
The automatic feed is regulated for injecting liquid into the generator while the
pressure in this generator is not maintained or brought back to the maximum
pressure which is regulated by the spring. By this means I avoid accidental
irregularities of the engine through too abundant an injection at a given moment
and also the swamping and cooling of the generator which are in most cases the
consequence.
But this combination, while diminishing the risks of swamping and cooling of the
generator, is not sufficient for causing them to disappear altogether. It may in
fact happen that a greater quantity of steam than that which the furnace has the
power to supply is led at a given moment into the cylinder of the engine at a
greater velocity and therefore at a smaller pressure than that fixed for the generator.
In this case the pressure can evidently not be maintained in the generator at the
fixed maximum at which it should be kept. The liquid being vaporized in
proportion to its passage and being then removed directly for doing work in the
cylinders, whilst the furnace is not sufficient for this expenditure of steam, the
pressure will be lowered in the generator, and the feed continuing, the generator
will be swamped and cease to operate after having furnished to the cylinders for
the last strokes only steam mixed with boiling water.
For obviating this inconvenience I place either at the outlet pipe of the
generator or only at the inlet of the special pipe for the independent feed a ball,
flap or other valve maintained by a spring or the like adjusted by means of a
screw to a very small pressure, such as 2, 14 or 1 kilogramme or even less, in short
to the pressure at which the engine must not work. The steam can therefore leave
the generator for performing work only when it has at least this pressure. When

page_text: it tends to descend below, the valve tends to close again and as the velocity of the
feed pump diminishes the quantities of liquid injected are lessened.
The serpentine therefore never takes a greater quantity of liquid than that
which the power of the furnace can vaporize at the fixed minimum pressure.
The engine works between a maximum and a minimum regulated beforehand.
This combination also enables the operation of the serpentine boiler and of the
independent feed to be easily started by arranging the boiler in such a manner
that when it is cold it still contains a certain quantity of liquid, which is achieved
by keeping at a higher level either the reservoirs or the feed regulating chamber
which encloses the valve for the return passage of the liquid, and by giving in the
latter case to the regulating chamber a sufficient capacity so that when the levels
are established the serpentine contains liquid up to the desired point.
In this manner the serpentine even without a preliminary feed will always have
liquid enough to enable a sufficient pressure to be raised for causing the action of
the independent feed.
If it is not desired to use the arrangement above described I may nevertheless
obviate in a simple manner the racing, by arranging upon an instantaneous generator
communicating freely with the slide valves, and not provided with the herein
described parts, a regulating valve adjusted to a pressure which the steam must
not exceed. When under these circumstances the serpentine produces a pressure
exceeding the fixed maximum pressure, the steam instead of giving its whole
power to the cylinder opens the valve and passes out through its orifice as long as
it does not fall to this pressure, at which moment the spring of this valve closes the
latter again and allows the operation to continue.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is :-
The before-described improvements in generators with instantaneous vaporization
in order to permit of their application to vehicles moving at velocities which vary
frequently in very great proportions and without necessitating a continuous
manipulation of the feed and without fear of any racing from the pressure above
the figure which is determined at will, these improvements consisting
First. In always maintaining at a maximum pressure which they cannot exceed
the generators with instantaneous vaporization.
Second. In automatically regulating the admission of the liquid into the
generator so that the latter will take the quantity of liquid necessary for
remaining at this pressure, whether the steam produced by the motor is used
or not.
Third. In driving the motor by opening more or less orifices for the
communication of the cylinders with the generator.
Fourth. In preventing the diminution of the pressure in the generator produced
by the great consumption of the motor by arranging either at the outlet of the
generator or in front of any source of steam, or only at the inlet of the special
source for the independent feed, a valve regulated to a pressure equal to the
minimum pressure at which the motor shall work.
Fifth. In order to have the serpentine always ready for operation and to be able
to take at any moment steam at the fixed pressure, whether the motor operates
already or has already stopped and while the serpentine is subjected to heat, the
establishment of a special source of steam for a feed pump.
Dated thin glas d
1004
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.