Injectors for Feeding Steam Boilers or other Purposes.
Year: 1888

page_text: Injectors for Feeding Steam Boilers or other Purposes.
I, FRANCIS BURDETT JOHNSON, Engineer, of Fenton, Stoke on Trent, Staffordshire
do hereby declare the nature of my said Invention to be as follows:-
This Invention relates to improved apparatus for regulating the supply of water to
injectors for feeding steam boilers or other purposes.
According to the usual practice the injector operated by exhaust steam from the
connected engine, is connected with an upper reservoir of water by piping provided
with means of controlling the supply of water needing the attention of an attendant,
and it necessarily happens when the injector is out of operation and such means of
control have not received the necessary attention of the attendant that the water of
the cistern runs to waste through the waste pipe of the injector. This is especially
liable to occur in intermittently acting engines which are frequently out of action,
such as those used for winding purposes at collieries among others, and in which during
the greater part of the time no steam passes to the injector the working of which is
consequently stopped and the water without attention of the attendant continues to
run to waste as aforesaid.
The especial object of the present Invention is to prevent this waste, and to such end
the Invention consists essentially in the hereinafter described means of automatically
controlling the supply of water from the cistern to the injector according to which such
supply is caused to be automatically effected upon and by the supply of steam to the
engine.
and
The improved apparatus consists essentially of a valve casing formed with an inlet
in connection with the cistern of water, an outlet in connection with the injector ;
a seating adapted for an automatically operated drop-valve. The valve is carried by a
rod passing through a suitable stuffing-box into an upper steam-chamber, into the
lower part of which live steam can be admitted from the steam pipe between the stop
valve of the engine and the engine cylinder by flexible or other piping, a part of the
said rod above the steam inlet being adapted with or formed as a piston fitting the
interior of the said steam chamber.

page_text: The piston is, however, formed with a small through passage, and the part of
the said rod above it works loosely in a top guide the underside of which is adapted
with an annular elastic cushion or seating fitting in an undercut recess.
The said stuffing-box may be conveniently screwed into the open top of the said
valve casing and its cover may conveniently form the bottom of the said steam chamber
being secured in position by screw bolts and nuts, the said top guide may also be
conveniently screwed into the open top of the said steam chamber.
In the normal position of the apparatus when the engine is stationary and the
injector is out of action, the water is automatically cut off from the injector by the fall
of the valve onto its seating. When, however, the engine is started, live steam escapes
from the steam pipe through the said flexible or other piping into the said steam
chamber, under the piston of the said rod, raising the latter and consequently the said
valve from its seating, permitting of the flow of the water to the injector, the piston being
raised into contact with the said under cushion or seating thus closing off the steam
chamber from communication with the external atmosphere so that the said valve will
be kept raised so long as steam is admitted to the said chamber; but when the engine
is stopped and the pressure of steam is taken off from the said steam chamber the
said piston falls slightly, allowing of the steam in the chamber and connected piping
freely escaping through the said passage in the piston and space between the rod and
its top guide, permitting of the valve immediately falling onto its seat, automatically
closing off the further supply of water to the injector and so preventing any waste
thereof.
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C.,
Agents for the Applicant.

page_text: Injectors for Feeding Steam Boilers or other Purposes.
I, FRANCIS BURDETT JOHNSON, Engineer, of Fenton, Stoke on Trent, Staffordshire
do hereby declare the nature of my said 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 improved apparatus for regulating the supply of water to
injectors for feeding steam boilers or other purposes.
According to the usual practice the injector, operated by exhaust steam from the
connected engine, is connected with an upper reservoir of water by piping provided
with means of controlling the supply of water needing the attention of an attendant,
and it necessarily happens when the injector is out of operation and such means of
control have not received the necessary attention of the attendant that the water of the
cistern runs to waste through the waste pipe of the injector. This is especially liable
to occur in intermittently acting engines which are frequently out of action, such as
those used for winding purposes at collieries, and locomotives among others, and in
which during the greater part of the time no steam passes to the injector the working
of which is consequently stopped and the water without attention of the attendant
continues to run to waste as aforesaid.
The especial object of the present Invention is to prevent this waste, and to such
end the Invention consists essentially in the hereinafter described means of automa-
tically controlling the supply of water from the cistern to the injector according to
which such supply is caused to be automatically effected upon and by the supply of
steam to the engine.
The improved apparatus is illustrated on the accompanying drawings in sectional
elevation in Fig. 1. and in plan view in Fig. 2.
It consists essentially of a valve casing, 3, formed with an inlet, 4, in connection
with the cistern of water; an outlet, 5, in connection with the injector; and a seating, 6,
adapted for an automatically operated drop-valve, 7. The valve, 7, is carried by a
rod, 8, passing through a suitable stuffing-box, 9, into an upper steam-chamber, 10,
into the lower part of which live steam is admitted from the steam pipe between the
stop valve of the engine and the engine-cylinder by flexible or other piping, 11; a
part of the rod, 8, above the steam inlet, 12, being adapted with or formed as a
piston, 13, fitting the interior of the chamber, 10. The piston is, however, formed
with a small through passage, 14, and the part of the rod, 8, above it works loosely
in a top guide, 15, the underside of which is adapted with an annular elastic cushion
or seating, 16, fitting in an undercut recess.
The stuffing-box, 9, may be conveniently screwed into the open top of the valve-
casing, 3, and its cover, 17, may conveniently form the bottom of the steam
chamber, 10, being secured in position by screw bolts and nuts, 18, and the said top
guide, 15, may also be conveniently screwed into the open top of the chamber, 10.

page_text: The normal position of the apparatus when the engine is stationary and the injector
is out of action is that represented in Fig. 1. wherein the water is automatically cut
off from the injector by the fall of the valve, 7, onto its seating, 6. When, however,
the engine is started, live steam escapes from the steam pipe through the pipe, 11,
into the chamber, 10, under the piston, 13, of the rod, 8, raising the latter and con-
sequently the valve, 7, from its seating, permitting of the flow of the water to the
injector, the piston, 13, being raised into contact with the said cushion or seating, 16,
thus closing off the chamber, 10 from communication with the external atmosphere so
that the valve, 7, will be kept raised so long as steam is admitted to the chamber, 10;
but when the engine is stopped and the pressure of steam is taken off from the
chamber, 10, the piston, 13, falls slightly, allowing of the steam in the chamber, 10,
and connected piping, 11, freely escaping through the passage, 14, and space between
the rod, 8, and its top guide, 15, permitting of the valve 7, immediately falling onto
its seat, 6, automatically closing off the further supply of water to the injector, and so
preventing any waste thereof.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The construction of apparatus to be used for the purpose of the invention
substantially in the manner hereinbefore described.
2. The application and use for the purpose of the Invention of apparatus constructed
and operating substantially in the manner hereinbefore described.
D
SA 1980
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C.,
Agents for the Applicant.