Improvements in or connected with Injectors.
Year: 1898

page_text: Date of Application, 17th May, 1898-Accepted, 5th Nov., 1898
COMPLETE SPECIFICATION.
Improvements in or connected with Injectors.
I, CHARLES MELBOURNE WHITE, of Rooms 221-225, Birkbeck Bank Chambers,
Southampton Buildings, in the County of Middlesex, Patent Agent, do hereby
declare the nature of this invention, a communication to me from abroad by The
Hayden and Derby Manufacturing Company, a corporation organised under the
laws of the State of New York, of 111, Liberty Street, in the City, County, and
State of New York, one of the United States of America, and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement:―
The invention relates principally to that class of injectors known as the "double-
tube," and the object is to construct an injector that embraces all the modern
refinements of operation that long experience in practical use has developed, in a
compact and simplified form, by making the operative parts strong and durable,
and so re-organizing the same relatively that large spaces or chambers and
extended communicating passages are dispensed with; the operative parts made
accessible and of such character as to be safely removed and repaired by an
ordinary mechanic.
Heretofore in this class of injectors the co-operative parts have been too widely
separated, involving the intercession of either chambers of extraordinary size or
of additional chambers or spaces and extended passages that form the necessary
communication between them.
In the present invention these objections have been overcome in locating such
co-operative parts in juxtaposition, which has not only reduced the injector in size,
but avoided delay in the method of operation and rendered the instrument in this
respect more certain and efficient.
The type and location of the valves have also rendered the same easy of access
and adapted for repairs by the user or by an ordinary workman, as will hereinafter
more particularly appear.
In order that others may understand and use the invention, I will first proceed to
describe a device embodying it, and subsequently will point out in the claims its
novel characteristics.
In the drawings:
Fig. 1, represents a longitudinal section.
Fig. 2, a plan view.
Fig. 3, a sectional view on line 3-3, Fig. 2.
Fig. 4, an end view partly in section on the line 44, Figs. 1 and 2.
Fig. 5, a transverse section on the line 5--5. Figs. 3 and 4, of an injector

page_text: bining tube; 10, the suction chamber of the lifter; 11, the discharge chamber
of the lifting apparatus and the inlet chamber of the forcing combining tube;
12, the discharge.chamber of the forcing apparatus; 13, an automatic valve con-
trolling a port leading from the discharge chamber of the lifting apparatus ;
14, a final positive overflow valve that controls the overflow port 4; 15, a check
valve opening towards the boiler inlet; 16, a steam throttling valve to the lifting
steam nozzle; 17, an auxiliary steam valve; 18, the main steam inlet valve, with
an extended plug 19, controlling a port leading to the forcing steam tube.
In the construction, as shown in Fig. 3, I preferably place the automatic valve 13
in a short passage 27, leading from the discharge chamber 11 of the lifting
apparatus to an adjacent supplementary passage which also communicates with
the discharge chamber 12 of the forcer, and contains the final positive overflow
port 4 and valve 14.
The final positive overflow valve 14 is located in this supplementary passage to
clear the mouth of the passage 27, and form an annular space 35 in communication
with the chamber 11, so that when it is moved towards its seat to close the final
overflow port 4 it will retard or check the flow of water through the passage 27
and annular space 35, but allow at all times a free communicating opening from
the discharge chamber 12 of the forcing apparatus through the passage 27 and
space 35 to the top of the automatic valve 13. This arrangement also provides for
a free, direct outlet from the discharge chamber 11 of the lifting apparatus to the
overflow port 4, there being no intervention of enlarged chambers to allow the
undue expansion of steam before it reaches the final overflow port.
The operation of this injector is substantially like all injectors of this class. The
steam inlet and final overflow valves are conjointly operated by the lever handle 21,
connected valve stem 22, connecting rod 23, levers 24 and 25, and overflow valve
stem 26, substantially in the usual way, except as herein before explained; steam
being first admitted to the lifting apparatus by means of a slight movement of the
lever-handle 21, which opens the auxiliary inlet valve 17 of the valve device 18,
the steam passes through the passage 28 and through the lifting steam nozzle 6
and the lifting combining tube 7 to the chamber 11, lifting the automatic valve 13,
then passing through the passage 27, into the supplementary chamber and through
the overflow port 4. The passing of the steam from the nozzle 6 through the
tube 7 produces a vacuum in chamber 10, which causes the water to enter through
the water inlet 3 to join the steam, whereby the latter is condensed and the water
follows the route of the preceding steam through the overflow. The lever handle 21
now being given a further movement causes the overflow valve 14 to move towards
its seat, which acts to retard the flow of water from the passage 27 and thus force a
portion of the water into and through the forcing combining tube 9.
A still further movement is given the handle 21, which withdraws the plug 19,
allowing steam to flow through the forcing steam nozzle, mixing with the water
already flowing through the forcing combining tube 9, thereby driving it through said
tube at a high velocity and causing a high pressure in the chamber 12, which is
instantly exerted on top of the automatic valve 13, through the communication
around the valve 14 and the passage 27, thus causing the valve 13 to be seated and 4
held to its seat by the pressure exerted on its top. A still further movement of
the lever 21 causes the final overflow 14 to close the overflow port 4, which diverts
the water from the overflow into the boiler through the check valve 15 and dis-
charge outlet 5. The independent spindle 29 and valve 16 is intended to regulate
the flow of steam to the lifting apparatus for the regulation of its capacity, as is 5
well understood by those conversant with the apparatus. An aperture 30 is
provided in the steam nozzle of the lifter of such size that will admit sufficient steam
to the lifter to enable the ejector to start and work at its minimum capacity,
should the operator seat the valve 16.
The advantages derived by having the overflow valve 14 located in close proximity 5
to the mouth of the passage 27, leading from the discharge of the lifting apparatus,
and so constructed and located that its movement will retard the flow of water

page_text: through this passage, are, that it drives the required amount of water under
pressure through the forcing combining tube 9, to insure, without fail, the proper
combining of the steam as it issues from the forcing steam nozzle. Without this
partial throttling it is necessary in practice to so time the movements of the valve
admitting steam to the forcing steam nozzle and the final overflow valve in relation
to each other, that the automatic valve must not only seat, but remain seated with
the first impulse of steam issuing from the forcing steam nozzle. Under certain
conditions that at times exist, especially when starting the injector, there is a
tendency of the pressures on top and underneath the automatic valve to balance,
which renders the instrument so sensitive as to require great care in operating the
valves, and it is also difficult for a mechanic unskilled in the manufacture of the
device to make repairs and maintain the proper relative adjustment or timing of
the parts. In injectors of this class, where a positive tightly fitting valve is used
to direct the flow of water to the forcing combining tube, instead of from the
overflow, it requires a valve fitted with a precision and careful adjustment relative
to the movement of the steam inlet valves beyond the skill of an ordinary mechanic,
to properly repair the instrument.
In the device shown in my invention, the automatic valve is seated and held
to its seat when the pressure in the discharge chamber of the forcer apparatus is
sufficiently great and constant to do so, and it will be apparent that there is no
nicety required in timing the movement of the final positive overflow valve to
force the required amount of water through the forcing combining tube in starting
the injector.
The check valve 15 is located in a casing 20, which is separable from the main
casing 1, by a flanged joint. The object in constructing a separate casing or shell
for the check valve is that it is often necessary to remove the injector for cleaning
or repairs when there is a pressure on the boiler and when the check valve is
located in the main body of the injector it is impossible to remove the injector under
the boiler pressure. The advantage derived by making the casing for the check
valve independent of the injector casing will thus become apparent. And further,
in joining the casing for the check valve to the main casing
of the injector, by means of a flanged joint, the injector casing
can be easily removed from the check valve casing without rotating the
injector proper, which would be necessary should the check valve casing be screwed
to the injector casing. It frequently happens that the injector is located when
piped close to the boiler, so that it is impossible to rotate it, and a joint made
that requires this would be of little value. Another object in flanging the check
valve casing to the injector casing is that when the joint is broken it gives a large
and full opening in which to insert or remove the necessary internal parts; and
besides, a flanged joint, unlike a threaded connection, can be repeatedly broken
without wear.
I do not confine myself to the form or arrangement of the check valve shown in
the drawing, as a horizontal or other type of valve may be substituted and accom-
plish the same purpose. I am aware that check valves have been used in con-
nection with the injector joined to the casing, but I believe I am the first to
separate the casing containing the check valve from the casing containing the
operative parts of the injector by means of a flanged joint, and securing thereby
the advantage stated.
In the construction of the handle lever mechanism the connecting bar or link 23
is connected to the head on the spindle 22 by means of the hooked ends or forks 31,
and passes through a cored passage within the lateral limits of the injector casing
and is thereby protected. The hooked ends or forks 31 admit of this disengage-
ment of the bar 23 from the spindle of the main steam valve, which permits the
independent closing of the overflow valve 14 without affecting the position of the
steam inlet valves; a handle 32 being provided for this purpose. This arrange-
ment also permits a slight amount of steam to circulate through the injector, and
thus act as a heater.

page_text: Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. In a double-tube injector, an opening or port controlled by an automatic
valve between the discharge chamber of the lifting apparatus and a passage which
contains the overflow port of the forcing apparatus, and a final positive overflow
valve constructed to choke the mouth of the communicating passage from said
automatic valve without closing said passage, as set forth.
2. In a double-tube injector, an opening or port in the discharge chamber of the
lifting apparatus, an automatic valve controlling said opening or port, a com-
municating passage leading from said opening or port to the overflow port of the
forcing apparatus controlled by a final overflow valve, the respective valves being
located in close proximity, as shown, and with no intervening chamber wherein an
expansion of the steam can take place, as described.
3. In an injector a check valve operating within a separable section of the
injector casing, and joined thereto by means of a flanged joint, whereby the main
body of the injector may be separated and removed therefrom by a longitudinal
movement without rotation and the interior parts of the injector rendered
accessible for removal or repair, as set forth.
4. In an injector, a casing made in two or more parts, a check valve located in
a casing containing the discharge outlet to the boiler, said check valve casing
being joined to the main injector casing by means of a flanged joint, whereby
the injector casing containing the operative parts of the injector can be removed
from the casing containing the check valve without disturbing or breaking the
discharge or delivery connection to the boiler, as shown and described.
5. In a double-tube injector, a lifting steam nozzle 6, a steam valve 16 and a
hole 30 in said nozzle, which shall admit sufficient steam to nozzle 6 to enable the
injector to work when the valve 16 is closed, as set forth.
6. In an injector a main steam valve, a stem to operate the same and a bar
connecting with the overflow valve, said bar having forks or prongs engaging the
stem of the steam valve, whereby the overflow valve may be independently operated,
as set forth.
Dated this 17th day of Mar 1900