Year: 1887

page_text: Date of Application, 11th Feb., 1887
Complete Left, 11th Nov., 1887.
Complete Accepted, 23rd Dec:, 1887
We, HARRY HOLDEN, of St. Simon Street, Salford, in the County of Lancaster,
Engineer, and ROBERT GRUNDY BROOKE, of the same place, Engineer, do hereby
declare the nature of this invention to be as follows:-
This invention relates to injectors in which both exhaust, or low pressure steam,
and high pressure, or live steam, are used to impart velocity to water. It is applicable
to apparatus in which a jet of water produced by exhaust, or low pressure steam, has
subsequently imparted to it an increased velocity and consequent penetrating power
by high pressure, or live steam; and to apparatus in which both exhaust, or low
pressure steam, and high pressure, or live steam, are used to project the water, the
one jet of steam being admitted around and the other through the spindle of the
injector in such manner that the jet of water is acted upon first by exhaust, or low
pressure steam, and subsequently by high pressure or live steam.
In each case our invention has for its object to render the apparatus automatic both
as regards starting and stopping, utilising the pressure of water produced by the
action of the exhaust, or low pressure steam, for the purpose of automatically admitting
high pressure or live steam to mix and form a combined jet with such water for the
purpose of increasing its velocity. An apparatus according to our invention may be
called a compound injector.
Such an injector of the type first referred to comprises an exhaust or low pressure
steam injector and a supplementary injector. By an exhaust injector we mean one
that imparts velocity to water for feeding a boiler, or other purpose, by means of steam
at or near atmospheric pressure, such as exhaust steam from an engine, or high
pressure steam purposely wire-drawn, or low pressure steam otherwise obtained. By
a supplementary injector we mean one that receives water from an exhaust injector,
and which is so constructed as to cause the water so received to combine with a jet of
high pressure, or live steam, whereby there is imparted to the water greater velocity
and consequent penetrating power than would be given to it by the action of the
exhaust, or low pressure steam alone.
As is well known, an exhaust injector alone as heretofore usually employed has not
been able to feed boilers working at pressures much above 75 lbs. per square inch.

page_text: Therefore such an injector has not been available for such purposes as locomotive,
tramway engine, and other high pressure boilers generally. To some extent, however,
exhaust injectors have been used in conjunction with supplementary injectors worked
by high pressure or live steam but the method of starting and working such a com-
bination of exhaust and supplementary injectors as heretofore usually practised has
been so complicated as to interfere with their utility.
Now according to our invention in order to simplify and to render automatic the
working and starting of the supplementary injector, we employ a compound injector
comprising an exhaust injector and a supplementary injector attached thereto in such
a manner that the exhaust injector will deliver into the supplementary injector, and
that when the exhaust injector is at work and is delivering water into the supple-
mentary injector, high pressure steam will be admitted automatically instead of as
heretofore by hand, so as to combine with the incoming water and to force it against
the higher pressure it is required to work against, and moreover the high pressure or
live steam will be automatically shut off from the supplementary injector as and when
required, so as to automatically prevent its blowing back through the injector as it
would do if not shut off directly on the exhaust injector ceasing to work. The com-
bined jets of water and high pressure steam do not upon first meeting immediately
form a combined jet of the velocity requisite to enable it to force against a high
pressure such as, for instance, that of the high pressure steam entering the injector,
but require first to be able to flow freely out by some exit offering comparatively
small resistance. In ordinary injectors such an exit can be provided for by the well-
known overflow gap, but as the water from an exhaust injector when mixed with
sufficient high pressure steam for our purpose will have a temperature considerably
over the boiling point of water at atmospheric pressure, such a jet would burst into
steam or spray in passing an overflow gap such as ordinarily used, and so destroy the
action of the injector. Therefore it has heretofore been usual to employ supplementary
injectors without overflow gaps, and to let out the water at starting from the delivery
end of the injector by a cock opened. and shut by hand.
It is known that a very hot jet may be made to pass an overflow gap by discharging
the overflow into a chamber under pressure, but as the water when starting an
ordinary injector has no initial pressure it is unable to escape through such closed
chamber and the injector cannot start. By repeated experiment we have found
that the requisite pressure in the overflow chamber of a supplementary injector to
keep the jet from bursting is not as great as the pressure of the water from the
exhaust injector which therefore has the requisito initial pressure to overcome the
pressure in the overflow chamber and so get freely away, and in apparatus according
to our invention we provide an overflow gap in our supplementary injector aranged
to deliver into a pressure chamber so closed as to maintain a given pressure.
A suitable pressure in the overflow chamber to prevent the bursting of the jet
is a pressure somewhat greater than that corresponding to the pressure of steam
such as co-exists with water having the temperature of the jet when crossing the gap.
The initial pressure of the water entering from the exhaust injector and previous to
its combination with live steam may be 75 lbs. or more.
For the purpose of causing the pressure of water from the exhaust injector to
automatically admit high pressure or live steam to mix and form a combined jet with
such water for the purpose of increasing its velocity, an arrangement according to
our invention is as follows:-The hot water delivered from the exhaust injector
passes into a cone in the supplementary injector; this cone terminates within a
combining cone, beyond which there is an overflow into a chamber, the outlet from
which is normally closed by a valve loaded so as to cause a sufficient pressure in the
chamber to prevent the jet from bursting at its highest temperature, but not such as
to prevent escape of the water coming from the exhaust. When water from the
exhaust injector enters the first mentioned cone of the supplementary injector, a
considerable pressure is set up in that cone and in the combining cone, owing to the
smallness of the end of the first mentioned cone. It results that water is forced up
a passage near the wider part of the first mentioned cone into a chamber provided

page_text: with an elastic diaphragm or with a piston, against which the water acts. Connected
to the diaphragm or piston is a loaded valve that controls the passage whereby high
pressure or live steam is conducted to the annular space between the smaller end of
the first mentioned cone and the mouth of the combining cone. Normally tho
entrance of high pressure or live steam is prevented by the valve, which is kept to
its seat by the pressure of steam and a spring. Upon water entering by the
before mentioned passage the chamber in which the diaphragm or piston is located,
such water will press upon the said diaphragm or piston; and although the pressure
of water in the chamber may not be as great as the pressure of steam on the valve,
yet the area of the diaphragm or piston exposed to the action of the water being in
excess of the area of the valve exposed to the steam, the valve will be opened in an
automatic manner, so admitting high pressure or live steam by suitable passages to
the annular space between the two cones before mentioned, so that such steam will
mingle with the water jet from the exhaust injector where the annular space enters
the combining cone, and the steam and water together will flow through the
combining cone and out by the overflow chamber past its loaded valve until the jet
is properly formed, whereupon it will cross the overflow gap and will pass through
the delivery passage into the boiler or other receptacle. Should the exhaust injector
from any cause (accidental or otherwise) cease to work, the pressure in the diaphragm
or piston chamber and the passage leading thereto will cease, and the valve that
controls the supply of high pressure or live steam will thereupon close, so instantly
and automatically preventing high pressure, or live steam from entering the
supplementary injector, and preventing blowing back into the exhaust injector.
Apparatus such as above referred to might be modified in various ways. Pressure
other than that from the first mentioned cone might be employed for actuating the
automatic apparatus. At starting and previous to the formation of the combined jet
a pressure equal to that in the said cone might exist in the overflow chamber. This
might be led to the diaphragm chamber by ineans of a special port provide with a
small valve. After the jet had formed this pressure might be maintained from the
delivery pipe through the said valve. Or again, as some pressure would always exist
in the overflow chamber itself whilst the exhaust injector was at work, this pressure
alone might, under some circumstances, be found sufficient.
In some cases it might not be desirable to make the area of the end of the first
mentioned cone so small as to give a pressure and then it would be requisite to use
the pressure set up in the supplementary injector from some other point or points as
above referred to.
Where a compound injector according to our invention is constructed with a hollow
spindle for the admission of high pressure, or live, steam as hereinbefore referred to
similar apparatus to that already described is suitably applied in connection with the
hollow spindle, so that the apparatus is rendered automatic, both as regards starting
and stopping the supply of high pressure, or live, steam which will only be admitted
after the requisite flow of water has been established by the action of the exhaust
steam.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicants.

page_text: improvements in injectors.
We, HARRY HOLDEN, of St. Simon Street, Salford, in the County of Lancaster,
Engineer, and ROBERT GRUNDY BROOKE, of the same place, Engineer, 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:-
This invention relates to injectors in which both exhaust or low pressure steam, and
high pressure, or live steam, are used to impart velocity to water. It is applicable to
apparatus in which a jet of water produced by exhaust, or low pressure steam, has
subsequently imparted to it an increased velocity and consequent penetrating power
by high pressure, or live steam; and to apparatus in which both exhaust or low
pressure steam, and high pressure, or live steam, are used to project the water, the one
jet of steam being admitted around and the other through a spindle in the injector in
such manner that the jet of water is acted upon first by exhaust, or low pressure steam,
and subsequently by high pressure or live steam.
In each case our invention has for its object to render the apparatus automatic
both as regards starting and stopping, utilising the pressure of water produced by the
action of the exhaust or low pressure steam, for the purpose of automatically admitting
high pressure or live steam to mix and form a combined jet with such water for the
purpose of increasing its velocity. An apparatus according to our invention may be
called a compound injector.
Such an injector of the type first referred to comprises an exhaust or low pressure
steam injector and a supplementary injector. By an exhaust injector we mean one
that imparts velocity to water for feeding a boiler, or other purpose, by means of
steam at or near atmospheric pressure, such as exhaust steam from an engine, or high
pressure steam purposely wire-drawn, or low pressure steam otherwise obtained. By
a supplementary injector we nean one that receives water from an exhaust injector,
and which is so constructed as to cause the water so received to combine with a jet of
high pressure, or live steam, whereby there is imparted to the water greater velocity
and consequent penetrating power than would be given to it by the action of the
exhaust, or low pressure steam alone.
As is well known, an exhaust injector alone as heretofore usually employed has not
been able to feed boilers working at pressures much above 75 lbs. per square inch.
Therefore such an injector has not been available for such purposes as locomotive,
tramway engine, and other high pressure boilers generally. To some extent, however,
exhaust injectors have been used in conjunction with supplementary injectors worked
by high pressure or live steam: but the method of starting and working such a
combination of exhaust and supplementary injectors as heretofore usually practised
has been so complicated as to interfere with their utility.
Now according to our invention in order to simplify and to render automatic the
working and starting of the supplementary injector, we employ a compound injector
comprising an exhaust injector and a supplementary injector attached thereto in such
a manner that the exhaust injector will deliver into the supplementary injector, and

page_text: that when the exhaust injector is at work and is delivering water into the supplementary
injector, high pressure steam will be admitted automatically instead of as heretofore
by hand, so as to combine with the incoming water and to force it against the higher
pressure it is required to work against, and moreover the high pressure or live steam
will be automatically shut off from the supplementary injector as and when required,
so as to automatically provent its blowing back through the injector as it would do if
not shut off directly on the exhaust injector ceasing to work. The combined jets of
water and high pressure steam do not upon first meeting immediately form a combined
jet of the velocity requisite to enable it to force against a high pressure such as, for
instance, that of the high pressure steam entering the injector, but require first to
be able to flow freely out by some exit offering comparatively small resistance.
ordinary injectors such an exit can be provided for by the well-known overflow
gap, but as the water from an exhaust injector when mixed with sufficient high
pressure steam for our purpose will have a temperature considerably over the
boiling point of water at atmospheric pressure, such a jet would burst into
steam or spray in passing an overflow gap such as ordinarily used, and so
destroy the action of the injector. Therefore it has heretofore been usual to
employ supplementary injectors without overflow gaps, and to let out the water at
starting from the delivery end of the injector by a cock opened and shut
by hand.
In
It is known that a very hot jet may be made to pass an overflow gap by discharging
the overflow into a chamber under pressure, but as the water when starting an ordinary
injector has no initial pressure it is unable to escape through such closed chamber and
the injector cannot start.
By repeated experiment we have found that the requisite pressure in the overflow
chamber of a supplementary injector to keep the jet from bursting is not as great as
the pressure of the water from the exhaust injector which therefore has the requisite
initial pressure to overcome the pressure in the overflow chamber and so get freely
away, and in apparatus according to our invention we provide an overflow gap in our
supplementary injector arranged to deliver into a pressure chamber so closed as to
maintain a given pressure.
A suitable pressure in the overflow chamber to prevent the bursting of the jet is a
pressure somewhat greater than that corresponding to the pressure of steam such as
co-exists with water having the temperature of the jet when crossing the gap. The
initial pressure of the water entering from the exhaust injector and previous to its
combination with live steam may be 75 lbs. or more.
For the purpose of causing the pressure of water from the exhaust injector to
automatically admit high pressure or live steam to mix and form a combined jet with
such water for the purpose of increasing its velocity, an arrangement according to
our invention is as follows:-
The hot water delivered from the exhaust injector passes into a cone in the
supplementary injector; this cone terminates within a combining cone, beyond which
there is an overflow into a chamber, the outlet from which is normally closed by a
valve loaded so as to cause a sufficient pressure in the chamber to prevent the jet from
bursting at its highest temperature, but not such as to prevent escape of the water
coming from the exhaust. When water from the exhaust injector enters the first
mentioned cone of the supplementary injector, a considerable pressure is set up in
that cone and in the combining cone, owing to the smallness of the end of the first
inentioned cone. It results that water is forced up a passage near the wider part of
the first mentioned cone into a chamber provided with an elastic diaphragm or with a
piston, against which the water acts. Connected to the diaphragm or piston is a
loaded valve that controls the passage whereby high pressure or live steam is
conducted to the annular space between the smaller end of the first mentioned cone
and the mouth of the combining cone. Normally the entrance of high pressure or
live steam is prevented by the valve, which is kept to its seat by the pressure of steam
and a spring.
Upon water entering by the before mentioned passage the chamber in which the

page_text: ;
diaphragm or piston is located, such water will press upon the said diaphragm or
piston and although the pressure of water in the chamber may not be as great as the
pressure of steam on the valve, yet the area of the diaphragm or piston exposed to the
action of the water being in excess of the area of the valve exposed to the steam,
the valve will be opened in an automatic manner, so admitting high pressure or live
steam by suitable passages to the annular space between the two cones before
mentioned, so that such steam will mingle with the water jet from the exhaust
injector where the annular space enters the combining cone, and the steam and water
together will flow through the combining cone and out by the overflow chamber past
its loaded valve until the jet is properly formed, whereupon it will cross the overflow
gap and will pass through the delivery passage into the boiler or other receptacle.
Should the exhaust injector from any cause (accidental or otherwise) cease to work,
the pressure in the diaphragm or piston chamber and the passage leading thereto will
cease, and the valve that controls the supply of high pressure or live steam will
thereupon close, so instantly and automatically preventing high pressure, or live steam
from entering the supplementary injector, and preventing blowing back into the
exhaust injector.
Apparatus such as above referred to might be modified in various ways.
Pressure other than that from the first mentioned cone might be employed for
actuating the automatic apparatus.
At starting and previous to the formation of the combined jet a pressure equal to
that in the said cone might exist in the overflow chamber. This might be led to the
diaphragm chamber by means of a special port provided with a small valve. After
the jet had formed this pressure might be maintained from the delivery pipe through
the said valve. Or again, as some pressure would always exist in the overflow
chamber itself whilst the exhaust injector was at work, this pressure alone might,
under some circumstances, be found sufficient.
In some cases it might not be desirable to make the area of the end of the first
mentioned cone so small as to give a pressure and then it would be requisite to use
the pressure set up in the supplementary injector from some other point or points as
above referred to.
Where a compound injector according to our invention is constructed with a hollow
spindle for the admission of high pressure, or live steam as hereinbefore referred to
similar apparatus to that already described is suitably applied in connection with the
hollow spindle, so that the apparatus is rendered automatic, both as regards starting
and stopping the supply of high pressure, or live, steam which will only be admitted
after the requisite flow of water has been established by the action of the exhaust
steam.
Referring to the accompanying 5 sheets of drawings.
Fig. 1 is a longitudinal vertical section of a compound injector according to this
invention and Fig. 2 is a transverse section thereof on the line a-b.
The remaining figures illustrate in section various modifications of apparatus
according to this invention, and are hereinafter described.
The compound injector comprises an exhaust injector A and a supplementary
injector B.
In the exhaust injector a is the casing thereof; a¹ a steam cone for admission of
exhaust steam and 6 a central spindle therein; c a water nozzle and combining cone ;
d a delivery cone; e the ordinary overflow opening; ffauxiliary overflow openings;
in communication with an auxiliary overflow chamber f* ; g and h overflow passages
in communication respectively with the overflow openings e and f respectively; and
i the overflow outlet; k is a hinged valve that normally closes the overflow passago h
by the action of its weight, aided by atmospheric pressure on its outer side due to
the vacuum produced in the auxiliary overflow chamber f* when the injector is
properly at work; it will nevertheless lift when necessary to allow of the exit of the
overflow from the openings f as is well understood. is the water supply passage
and m the delivery passage for the current of combined water and steam from the
delivery cone d.

page_text: In the supplementary injector 1 is the casing thereof; 2 a water nozzle; 3
a combining cone; 4 a delivery conc, 5 a delivery passage; and 6 an overflow
passage in communication with an overflow chamber 7 the outlet of which is normally
closed by a valve 8 weighted as required by a spring 9. 10 is a diaphragm
that works in a chamber 11 formed in a casing 1ª, which for convenience is
made separate from but secured to the casing 1; 12 a valve connected to and
operated by the diaphragm 10; 13 a passage in communication with the
interior of the water delivery nozzle 2 and with the space beneath the diaphragm 10 ;
14 a passage for live steam; 14ª is a passage for steam from the passage 14 to an
annular space 15 between the water nozzle 2 and the combining cone 3; 16 is a hole
to prevent accumulation of pressure on top of the diaphragm 10 in case of leakage
past the pin or spindle 17 that connects the diaphragin 10 with the valve 12. The
valve 12 may or may not be provided with a spring according to circumstances. In
the example shown, it is provided with a spring 18.
The action of the compound injector is as follows: When the exhaust injector is
started and is properly at work the pressure of water thereby set up in the water
nozzle 2 will be transmitted to the diaphragm 10 by way of the passage 13 and will
be sufficient to lift the diaphragm against the pressure of live steam (and of the
spring 20 when used) on the valve 12. The valve will thus be automatically lifted,
and high pressure or live steam will pass through the passage 14 and space 15, and
mingling with the water jet passing through the nozzle 2 will impart to it tho
required additional velocity and penetrating power. If the exhaust injector be
stopped, the pressure below the diaphragm 10 will cease, the valve 12 will be closed
against its seat, and the high pressure or live steam automatically cut off from the
supplementary injector. The overflow from the supplementary injector that takes
pluce before this injector is fairly at work escapes past the valve 8 which is weighted
to an extent sufficient to prevent the overflow jet bursting into steam but
nevertheless such as to permit of the escape of the overflow as hereinbefore
described.
In Figs. 3 and 4 are similar views to Figs. 1 and 2 a piston 10* is used instead
of the diaphragm shown in fig. 1, the said piston being automatically operated
by the pressure of water set up in the delivery passage 5 that leads to the boiler
or other place to which the water is fed. In other respects the construction and
operation of this compound injector is similar to that shown in figs. 1 and 2 and is
similarly lettered and figured.
Fig. 5 is a longitudinal vertical section, wherein the exhaust and supplementary
injectors are combined in one casing.
"For this arrangement the exhaust delivery cone d overflow opening e passage g
and supplementary water nozzle 2 shown in figs. 1 and 3 are dispensed with the
exhaust injector delivery water direct from its combining cone c into the combining
cone 3 of the supplementary injector, between which cones there is the space 15
for admission of high pressure steam to the latter cone as before. The exhaust and
supplementary overflow passages in this arrangement have an outlet 19 common to
both, but they may have separate outlets if desired. This construction may be
adopted in injectors of various constructions whether provided with a weighted valve
or not.
In Fig. 6, which is a similar view to Fig. 1, the diaphragm 10 is contained in a
chamber 11 that is in communication at 20 with the atmosphere and at 21 with the
auxiliary overflow chamber *. When the injector is properly at work a vacuum or
partial vacuum is formed in this overflow chamber as is well understood and the
reduction of pressure thus produced on one side of the diaphragm 10 causes the
atmospheric pressure acting on the other side to automatically move the valve 12
from its seat and admit high pressure steam to the supplementary injector.
In this arrangement the overflow chamber is closed and has no outlet or valve as in
the herein previously described arrangements; it provides sufficient relief to the jet
to enable the injector to start. A permanently closed overflow chamber may be used
with other arrangements of supplementary injectors.

page_text: The position of the overflow opening 6 need not always be at the narrowest part
of the cone as shown, and there may be in some cases several overflow openings
placed at various points of the combining nozzle as shown in the combining
nozzles of the exhaust injectors, but in all cases they would always discharge into a
chamber or passage provided with a weighted valve or into a closed chamber.
Fig. 7 is a longitudinal vertical section, and
Fig. 8 a transverse section on the line c-d of a compound injector according to
this invention in which the jet of high pressure or live steam is admitted to the
centre of the combining cone of the supplementary injector by a steam cone or
hollow spindle 22 the water from the exhaust injector being admitted around such
jet. By admitting the high pressure or live steam in this manner, it is caused to
combine much more readily with the hot feed water from the exhaust injector and
renders the apparatus more reliable and certain in practice. The piston 10* in this
arrangement carries a spindle 23 the lower end of which forms a valve 12 that rests
upon the upper part of the steam cone 22 and closes it when the exhaust injector
is not in action, or properly at work. Packing 24 prevents high pressure or live
steam that enters by the inlet passage 14, from acting upon the underside of the
piston 10*. The water delivered by the exhaust injector when it is properly at work
passes into the combining cone 3 of the supplementary injector through openings 25;
it also acts against the underside of the piston 10*, lifting the spindle 23 and
automatically admitting high pressure or live steam to the cone 22. When the
exhaust injector stops or is not properly at work the spring 18 acts as before to
automatically cut off the supply of high pressure steam. 26 is a seat against which
the upper part of the piston 10* hears when raised, leakage of water past the piston
being thus prevented.
Fig. 9 is a longitudinal vertical section in which the exhaust and supplementary
injectors are combined in one casing the high pressure or live steam being admitted
to the centre of the hot feed water from the exhaust injector as in the last described
arrangement.
Fig. 10 is a horizontal section in the line e-f, and
Figs. 11 and 12 transverse sections in the lines g-h, and i- respectively of
Fig. 9.
In this arrangement the piston 10* instead of being provided with a spring as in
the last described arrangement is provided at its upper side with a
spindle 23* of
larger diameter than the spindle 23 at its lower side. The valve 12 at the lower end
of the spindle 23 is forced to its seat when the exhaust injector is not at work, or not
properly at work by high pressure steam that passes from the inlet passage 14 through
a passage 27 formed through the spindles 23 23* and piston 10* and acts continuously
upon the upper end of the spindle 23*. The pressure of such steam is however not
sufficient to overcome the pressure of water from the exhaust injector when acting
upon the larger area of the underside of the piston 10*. Packing at 28 is employed
to prevent the high pressure steam leaking past the spindle 23* and escaping through
the hole 16. 26 is a seat as in the last arrangement, arranged below the opening 16;
against it the upper surface of the piston 10* rests and forms a close joint when this
piston is forced up by the pressure of water below it, thus preventing the escape of
such water. By this construction the piston 10* may be made an easy fit in its
cylinder, and thus will not be liable to become fast. The exhaust steam passage
and the water supply passage are shown provided respectively with a butterfly
valve 29 and a plug valve 30, the spindles of which are connected by segmental bevil
wheels 31 in such manner that by turning the spindle 32 connected with the plug
valve 30 both valves are operated simultaneously for admitting or for cutting off the
supply of exhaust steam and water.
12*
Fig. 13 is a vertical section of an exhaust injector the steam cone of which is
provided with a central supplementary steam cone or hollow spindle 33 to which high
pressure or live steam is admitted by the pressure of water set up in the delivery
passage 5 acting upon the piston 10* when the injector is properly at work. The
arrangement is such that the water is first acted upon by the exhaust or low pressure

page_text: steam and subsequently by the high pressure or live steam. This arrangement of
central supplementary steam cone or hollow spindle 33 may be used with a valve 12
and diaphragm 10 arranged and operating as herein before described with reference
to Fig. 6.
Fig. 14 is a vertical section of an exhaust injector similar to that shown in Fig. 13
but in which the piston 10* is operated for admitting high pressure steam to the
supplementary steam pipe or hollow spindle 33 by the water in the supply passage 1.
As the supply water for exhaust injectors must be fed from a source placed above the
injector, there will always be sufficient pressure in the passage I so long as such
water does not pass through the injector as fast as it is supplied. In some cases the
water pressure is considerable and where it is desirable to first of all establish a
strong current of water through the injector-as is the case where the exhaust
steam comes in sharp beats or is otherwise too powerful-the pressure of this head
of water may be utilised for causing high pressure or live steam to be admitted to
the supplementary steam cone 33 before the exhaust injector has got to work. The
pressure of the live steam causes an instantaneous flow of water through the
injector with which water a powerful and troublesome supply of exhaust steam will
readily combine.
In this arrangement the high pressure or live steam is not automatically cut off
when the exhaust injector ceases to work. A separate steam valve is therefore
provided for cutting off the supply of high pressure or live steam.
In Figs. 1 and 2; in Figs. 3 and 4; and in Figs. 7 and 8, the supplementary
injector is in cach case shown as a separate apparatus applied to an exhaust injector.
The exhaust injector in each case, as also in the case of Fig. 9, may be of any suitable
construction and not necessarily of the form shown and described.
Having now particularly described and ascertained the nature of the said
invention, and in what manner it is to be performed, we declare that what we
claim is :-
1. In an injector a diaphragm or piston and a valve so arranged respectively in
communication with or relation to a passage through which a jet of liquid can be
forced by the action of exhaust or low pressure steam, and in connection with or
relation to a passage for high pressure or live steam, that after a jet has been started
by exhaust or low pressure steam the relation between pressures at the respective
sides of the diaphragm or piston will be altered and the valve will be opened to admit
high pressure or live steam to the said jet of liquid in the injector for the purpose
of increasing the velocity thereof and of enabling it to exert a greater pressure than
that due to the velocity caused by the exhaust or low pressure steam.
2. An injector of the kind referred to in Claim provided with an overflow
chamber closed substantially as hereinabove described for the purpose specified.
3. Our improved supplementary injectors substantially as described with reference
respectively to and illustrated by Figs. 1 and 2; by Figs. 3 and 4; and by Figs. 7 and 8
of the drawings, whether a diaphragm 10 or a piston 10* be employed.
4. Our combined exhaust and supplementary injectors substantially as described
with reference respectively to and illustrated by Fig. 5 and by Fig. 6 of the drawings,
whether a diaphragm 10 or a piston 10* be employed.
5. Our combined exhaust and supplementary injectors substantially as described
with reference to and illustrated by Figs. 9 to 12 inclusive, whether with or without
the connected valves 29 and 30.
6. An injector comprising a diaphragm or piston and a valve so arranged
respectively in communication with or relation to a passage through which a jet of
liquid can be forced by the action of exhaust or low pressure steam, and in
connection with or relation to a passage for high pressure or live steam, that after
a jet has been started by exhaust or low pressure steam, the relation between
pressures at the respective sides of the diaphragm or piston will be altered, the valve
will be opened, and high pressure or live steam will be admitted through a hollow
B

page_text: spindle to the said jet for the purpose of increasing the velocity thereof and of
enabling it to exert a greater pressure than that due to the velocity caused by the
exhaust or low pressure steam alone.
7. Our combined exhaust and live steam injectors substantially as hereinabove
described with reference respectively to and illustrated by Fig. 13 and by Fig. 14 of
the drawings annexed, whether a piston 10* or a diaphragm 10 be employed.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicants.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicants.