Improvements in or relating to Feeding Apparatus for Steam Boilers.
Year: 1895

page_text: Date of Application, 4th June, 1895
Complete Specification Left, 20th Feb., 1896-Accepted, 28th Mar., 1896.
PROVISIONAL SPECIFICATION.
Improvements in or relating to Feeding Apparatus for Steam
Boilers.
.
We, HENRY UPPLEBY WOLLASTON and GEORGE PERCY ROSSMORE FELL,
both of Gotha Iron Works, Slough, in the County of Bucks, Engineers, do hereby
declare the nature of this invention to be as follows:--
This invention relates to boiler feeding apparatus and more particularly to that
portion of a boiler feeding apparatus known as the delivery valve, through which
the water passes on its way to the boiler and by which the return of the water
from the boiler is prevented when the injector or feed pump ceases to act.
The chief object of this invention is to provide a self-closing uon-return valve in
combination with a stop valve actuated at will by hand or otherwise, each valve
having an independent seating so constructed and arranged that a greater degree.
of compactness with less complication of the delivery passage is obtained than has
hitherto been the case.
This improved arrangement of the delivery valve is more especially designed
for, and intended to be used in combination with, certain boiler-feeding apparatus
known as
"Combination Injectors," in which several boiler fittings usually
separate and distinct from the injector are combined in one apparatus, and in
which compactness and simplicity are important desiderata, as will be readily
understood.
The chief feature of our invention is the arrangement of the two valves, viz. the
stop valve and the non-return valve, concentrically or one within the other so as to
close on concentric seats.
In carrying our invention into practice according to one arrangement we
construct a delivery valve having a casing formed with a single diaphragm, which
is pierced for the passage through it of the feed water to the boiler. On the
delivery side of this diaphragm a seating is formed for a non-return valve; and on
the same diaphragm and surrounding the aforesaid seating, is an outer seating for
a stop valve.
In some instances however the positions of the valves are reversed
the non-return valve being arranged externally to the stop valve.
The non-return valve is furnished with, guides loosely fitting the hole in the
diaphragm, and with a prolongation or guide in its upper part fitting the stem of
the stop valve.
::
The lower part of the stop valve is cup-shaped, the outer edge or rim of the cup
being the valve proper, bearing, when in its lowest position, on the outer seating of
the diaphragm herein before referred to, in which position it surrounds and encloses
the non-return valve. in such a manner as to cut off all communication between the
said valve and the boiler. The cavity of the cup forms a chamber into which the
non-return valve is free to rise whether the stop valve be closed or not, but is so
arranged that when the stop valve is in its highest position the upward travel or
lift of the non-return valve is limited to such an amount as is sufficient to give a
free passage to the feed water on its way to the boiler. The stop valve is
provided with a stem having a screw thread which engages in a suitable screwed
guide that passes out through a packing gland; means are provided for rotating
the stem to close and open the valve. The said stem is made hollow for part of its
length from the cup-shaped cavity and forms a guide, for the stem of the non-return
**

page_text: valve. A spring is sometimes fitted within the said hollow part of the stem to
ensure the non-return valve closing properly on its seat.
When used in combination with the boiler-feeding apparatus known as a
combination injector we prefer to construct the casing of the delivery valve as a
continuous part of the body of the injector, the diaphragm on which the valve
seatings are formed being in this case a portion or prolongation of the wall of the
injector delivery chamber. It will be readily understood that the casing of the
delivery valve may be bolted or otherwise attached to the body of the injector if
preferred.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicants.
Improvements in or relating to Feeding Apparatus for Steam.
Boilers.
We, HENRY UPPLEBY WOLLASTON and GEORGE PERCY ROSSMORE FELL,
both of Gotha Iron Works, Slough, in the County of Bucks, Engineers, 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 boiler feeding apparatus and more particularly to that
portion of such apparatus known as the delivery valve through which the water
passes on its way to the boiler and by which the return of the water from the boiler
is prevented should the injector or feed pump cease to act.
The chief feature of this invention is a novel combination of a self-closing or
non-return valve within a screw down stop-valve so constructed and arranged that
a greater degree of compactness with less complication of the delivery passage are
obtained than has hitherto been the case.
more especially designed
According to our invention the stop valve and the non-return valve, together
constituting what we will term the delivery valve, are arranged concentrically or
one within the other so as to close on concentric seats.
This improved construction of the delivery valve
for, and intended to be used in combination with, certain boiler-feeding apparatus
known as "Combination Injectors," in which several boiler fittings usually
separate and distinct from the injector are combined in one apparatus, and in
which compactness and simplicity are important desiderata, as will be readily
understood.
In the accompanying drawings
Figure 1 is a sectional elevation of the delivery valve of a boiler feeding
apparatus constructed according to this invention.
Figure 2 is a section of a delivery valve illustrating a slight modification
hereinafter described.
Figure 3 is a longitudinal central section of a complete boiler feeding apparatus
of the kind known as a "Combination Injector" having the present improvements
applied thereto.
},
Like letters of reference denote corresponding parts in the several figures.
A is the body or casing of the boiler feed apparatus; B is the self-closing or
non-return valve, and B is the seating for said valve; C is the screw-down stop-
Valve controlled by the screw-threaded stem or spindle C, and C' is the seating
for the said valve C; D is the thoroughfare through the body or casing for the
passage of the feed water; D is the outlet from the casing leading to the boiler.

page_text: The seatings B¹ and C¹ are concentric with each other, the former being smaller-
than the latter.
The valve B is furnished with guides B2 loosely fitting the thoroughfare D,.
and with a stem or guide B³ on its upper part fitting within a hollow or recess.
in the stem C' of the stop valve C, and being thereby guided in its up and down
movements.
ID
The stop valve is cup shaped as shown, the edge or rim of the cup constituting
the valve face that rests when in its lowest position, on the outer seating C¹.
this position the valve C surrounds and encloses the non-return valve B in such a
manner as to cut off all communication between the said valve B and the boiler..
In Figures 1 and 3 the rim of the stop valve is shown coned externally to fit an
internally coned seating C¹, whereas in Figure 2 the rim of the stop valve is coned
internally and fits an externally coned seating. The cavity C³ of the stop valve
forms a chamber into which the non-return valve is free to rise whether the stop
valve C be closed or not, but is so arranged that when the stop valve is in its.
highest position the upward travel or lift of the non-return valve is limited to such
an amount as is sufficient to give a free passage to the feed water on its way to the
boiler. The screw threaded part of the stem C² of the stop valve works in a screw
threaded cap E which is screwed to the casing A, and the upper plain part of the
said stem passes out through a packing gland F shown clearly in Figure 3; any
suitable means are provided for rotating the stem C' to close and open the valve C..
A spring G is sometimes fitted within the hollow part of the stem C³ above the
stem B of the non-return valve to ensure the proper closure of the latter valve.
when water is not flowing through the apparatus. This spring is specially
advantageous in those instances where the valve spindle is not vertical.
When used in combination with the boiler feeding apparatus known as a.
Combination Injector as shown in Figure 3 we prefer to construct the casing of the
delivery valve as a continuous part of the body of the injector, the valve seatings.
being in this case preferably formed in a portion or prolongation of the wall of
the injector delivery chamber. It will be understood that the casing of the
delivery valve may be bolted or otherwise attached to the body of the injector if
preferred.
Having now particularly described and ascertained the nature of our said inven--
tion and in what manner the same is to be performed, we declare that what
we claim is :-
:-
1. In a boiler feeding apparatus, a delivery valve consisting of a stop valve and
a self-closing or non-return valve arranged concentrically, substantially as described,.
and for the purposes specified.
2. A boiler feeding apparatus constructed substantially as described with.
reference to one or other of the figures of the drawings for the purposes specified.
Dated this 20th day of February 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicants..