Improvements in Boiler Feedwater Heating and Purifying Apparatus.
Year: 1894

page_text: Date of Application, 25th Jan., 1894
Complete Specification Left, 24th Oct., 1894-Accepted, 24th Nov., 1894
PROVISIONAL SPECIFICATION.
Improvements in Boiler Feedwater Heating and Purifying
Apparatus.
I, JAMES EDMUND CARROLL, of Albany Buildings 39 Victoria Street,
Westminster Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to an improvement in apparatus for heating and purifying
feed-water before its introduction into the boiler.
In feed water purifying apparatus placed inside boilers difficulties arise causing
explosions detrimental to the operation of the apparatus and dangerous to the safety
of the boiler.
The object of my invention is to overcome these difficulties and for this purpose
I propose to provide an automatic equilibrium valve for the purpose of regulating
and controlling the flow of water to the purifier and also of the discharge of its
contents, whereby the formation of a vacuum or of an excessive pressure within the
purifier is entirely obviated without the use of any safety or relief valve.
In applying my invention to a steam boiler, I arrange for the feed water inlet to
enter at a short distance below the normal level of the water in the boiler, and for
this inlet to deliver into a tube or chamber of larger dimensions also arranged below
the water level. From this enlarged tube a chamber or series of smaller tubes
extend in an upward direction so as to protrude above the level of the water, at
which point they are each connected to a horizontal tube running in the direction
of the axis of the boiler. Each of these horizontal tubes may be closed at its
extreme end and provided with one or more perforations upon its upper surface, or
the end of the tube may be turned in an upward direction.
At or about the centre of the enlarged tube or chamber which is below the level
of the water, I attach my automatic equilibrium valve. This valve is preferably
made spherical and is arranged within a double seat or chamber which is in direct
communication on one side with the enlarged tube or chamber, and on the other
with the water in the boiler, the arrangement being so constructed as to permit of
the spherical valve closing one or other of the openings or remaining at rest midway
between the two openings. When the feed is open the spherical valve closes the
communication with the boiler, the feed water being driven up through the vertical
tubes and through the horizontal tubes into the boiler.
When the blow-off is opened for the purpose of cleaning the purifier the pressure
of the steam entering the enlarged tube or chamber through the horizontal tubes
keeps the spherical valve closed also, but immediately this blowing-off is accom-
plished and the blow-off valve closed, the hot water within the boiler enters the
enlarged tube or chamber before any cold feed-water can be injected therein, and
thus prevents the possibility of a vacuum being formed or of any sudden generation
of steam.
1
SL of Tanu 1894

page_text: COMPLETE SPECIFICATION.
Improvements in Boiler Feedwater Heating and Purifying
Apparatus.
I, JAMES EDMUND CARROLL, of Albany Buildings, 39 Victoria Street,
Westminster, 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 :-
My invention relates to an improvement in apparatus. for heating and purifying
feed water before its introduction into the boiler, and its object is to automatically
regulate the flow of water to the purifier and control the discharge of its
contents.
In feed water purifying apparatus placed inside boilers as hitherto constructed
difficulties arise causing explosions detrimental to the operation of the apparatus
and dangerous to the safety of the boiler.
In order to overcome these difficulties I propose to provide an automatic
equilibrium valve for the purpose of regulating and controlling the flow of water
to the purifier and also the discharge of its contents, whereby the formation of a
vacuum or of an excessive pressure within the purifier is entirely obviated without
the use of any safety or relief valve.
In order that my invention may be clearly understood reference is had to the
accompanying drawings illustrating the same upon which :-
Figure 1. is a transverse section of a valve constructed according to my
invention.
Figure 2 being a side elevation of the same with valve cover removed shewing
valve face on line 1-2..
Figure 3 is a sectional plan of the same.
Figure 4 is a plan shewing the application of the purifier to a steam boiler.
Figure 5 is a longitudinal section of the same.
In applying my invention to a steam boiler as shewn on Figure 4, I arrange for
the feed water inlet to enter at a short distance below the level of the water in the
boiler and for this inlet to deliver into a tube or chamber A of larger dimensions
also arranged below the water level. From this enlarged tube or chamber A a
series of smaller tubes B extends in an upward direction so as to protrude above
the level of the water, at which point they are each connected to a horizontal
tube C running in the direction of the axis of the boiler. Each of these horizontal
tubes may be closed at its extreme end and provided with one or more perforations
upon its upper surface, or the end of the tubes may be turned in an upward
direction as shewn on Figure 5.
I construct my automatic equilibrium valve as shewn on Figure 1 and arrange it
at or about the centre of the enlarged tube or chamber A which is below the level
of the water. This valve D is spherical, and is arranged within a double seat or
chamber E which is in direct communication on one side F with the enlarged tube
or chamber A. and on the other side G with the water in the boiler, the arrange-
ment being so constructed as to permit of the spherical valve D closing one or
other of the openings F or G, or remaining at rest_midway between the two
openings. When the feed is open the spherical valve D closes the communication
with the boiler and is in the position shewn on Figure 3, the feed-water being
driven up through the vertical tubes and so through the horizontal tubes C into
the boiler.
When the blow-off is opened for the purpose of cleaning the purifier the pressure
of the steam entering the enlarged tube or chamber A through the horizontal
tubes C keeps the spherical valve D closed also, but immediately this blowing-off
is accomplished and the blow-off valve closed, the valve D drops to its intermediate
position and the hot water within the boiler enters the enlarged tube or chamber

page_text: before any cold feed-water can be ejected therein, and thus prevents the possibility
of a vacuum being formed or of any sudden generation of steam taking place within
the chamber.
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. In combination with feed water heating and purifying apparatus, the use of an
automatic valve for the purpose of permitting the entrance of hot water from the
boiler to the purifying tubes after the operation of blowing off is effected and
before the feed-water is admitted, as and for the purposes described.
2. Apparatus for heating and purifying feed-water, substantially as described and
illustrated.