Improvements in Injectors for Steam Boilers.
Year: 1893

page_text: Date of Application, 19th Dec., 1893
Complete Specification Left, 19th Sept., 1894-Accepted, 17th Nov., 1894
PROVISIONAL SPECIFICATION.
Improvements in Injectors for Steam Boilers.
I FREDERICK WILLIAM GOLBY of 36 Chancery Lane, in the County of
Middlesex, Patent Agent, do hereby declare the nature of this invention as
communicated to me by Constantin Thiéry de Paul of Meurchin (Pas de Calais)
France, Architect, to be as follows :―
This invention relates to injectors for steam boilers whereby cold water hot
water, or a mixture of both can be fed into the boiler.
The water inlet pipe leading to the injector passes through a chamber communi-
cating with the feed water tank. In this chamber is fitted a valve which in one
extreme position opens communication between the cold water supply and the
injector, and in the other extreme opens communication between the feed water
tank and the injector. In the mid position of the valve the injector is open to
both the cold and hot water supplies so that a mixture is fed to the injector.
Dated this 19th day of December 1893.
F. W. GOLBY,
36, Chancery Lane, London, W.C.
COMPLETE SPECIFICATION.
Improvements in Injectors for Steam Boilers.
I FREDERICK WILLIAM GOLBY of 36 Chancery Lane, in the County of
Middlesex, Patent Agent, do hereby declare the nature of this invention as
communicated to me by Constantin Thiéry de Paul, of Meurchin, Pas de Calais,
France, Architect, 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 for steam boilers whereby cold water or hot
water or a mixture of both can be fed into the boiler, and whereby also the
difficulty hitherto experienced of starting the feeding of hot water to the boiler is
overcome. The essential feature of the invention is the forcing of hot water from
the feed tank by means of the suction produced by a jet of cold water under
pressure.
The cold water inlet pipe leading to the injector passes through a chamber
communicating with the feed water tank. In this chamber is fixed a valve which
in one extreme position opens communication between the cold water supply and
the injector, and in the other extreme position opens communication between the
feed, water tank and the injector. In the middle position of the valve the
injector is open to both the cold and hot water supplies so that a continuous stream
is supplied to the injector.
In the accompanying drawings the invention is shewn as applied to different
types of injectors.
Similar letters of reference where they occur are used to indicate the same or
corresponding parts.
Figure I is a section shewing the apparatus in the shut off position. It will be
observed that in this position the valve B rests on the seats a and b of the valve
casing A, so that communication is shut off from the cold water inlet tube e aud
the feed water tank G.
Figure II is a section shewing the apparatus partly open. By rotating the

page_text: spindle E the valve B is drawn off the conical valve seats a and b and communi-
cation is opened with the inlet tube to the interior of the tubular extension of the
valve B by means of the apertures therein. The total capacity of these
apertures is equal to the capacity of the inlet e which is equal to the capacity of
the outlet d. The cold water then flows from the inlet tube e through the
apertures into the tubular extension of the valve B; from thence it passes into
the casting or piece F situated inside the feed water tank G and having curved
interior surfaces whereby the inrushing water is formed into a vortex and caused
to return outside the tubular extension of the valve B passing through the valve
box a to the tube d leading to the injector.
The amount of cold water passing through the valve B being as much as can flow
off through the outlet d no suction will be produced on the water contained in the
tank G and therefore no admixture of the hot and cold water will take place, and
the water passing to the injector will be practically of the same temperature as
when it entered the inlet e. If the injector is not working then the water coming
through the tubular extension of the valve B will pass from the casting or piece F
into the feed water tank G.
Figure III shews a third position of the valve B whereby a smaller quantity of
water flows from the cold water inlet tube e and a correspondingly larger quantity
from the feed water tank G. This is effected by rotating the valve spindle E
until the valve B is in close proximity to the valve seat c in the branch C thus
diminishing the supply of cold water which passes by way of the apertures / and
tubular extension of the valve B to the interior of the casting or piece F in the
form of a jet creating a partial vacuum around the mouth of the casting or piece F
whereby the hot water is drawn from the feed tank G and mixing with the cold
water issuing from the mouth of the casting or piece F passes with it to the tube d
leading to the injector.
Figure IV is a section shewing the apparatus in position for feeding only hot
water to the injector. By the further rotation of the spindle E the upper end of the
valve B is brought against the conical seat c thus cutting off communication with
the cold water inlet tube e. With the injector at work when the valve is in this
position the water is drawn only from the feed water tank G.
Having now particularly described and ascertained the nature of this said
invention and in what manner the same is to be performed, I declare that what I
claim is :-
Apparatus for feeding hot or cold water or a mixture of both to an injector
consisting of a valve having a tubular extension with apertures therein working in
a valve casing having three seats and three branches leading respectively from the
hot and cold supplies and to the injector, and a casting or piece situated in the feed
water tank and having curved interior surfaces all combined and operating
substantially as described and illustrated in the accompanying drawings and for
the purpose stated.
Dated this 19th day of Sentember 1801
, F. W. GOLBY,
36, Chancery Lane, London, W.C.