Improvements in Boiler Feedwater Heating and Purifying Apparatus.
Year: 1890

page_text: Date of Application, 29th July, 1890
Complete Specification Left, 29th Apr., 1891-Accepted, 30th May, 1891
PROVISIONAL SPECIFICATION.
Improvements in Boiler Feedwater Heating and Purifying
Apparatus.
I JAMES EDMUND CARROLL, of 28 and 29 St. Swithin's Lane, in the City and
County of London, 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 apply a relief valve, or valves, or other escape for steam from the feed
pipes or feed water purifying apparatus into the boiler and thereby prevent the
formation of a vacuum in these pipes or apparatus.
I may find it preferable to place a valve on an air chamber or pipe elevated
above the apertures or discharge into the boiler, using an ordinary check-valve;
but I may use any suitable valve, or valves, and I may simply make a small
perforation in the air chamber or pipe for this purpose, and place my relief on any
part of the feed pipe, or any part of the purifying apparatus which I may in
practice find most suitable.
Dated this Twenty-ninth day of July 1890.
COMPLETE SPECIFICATION.
Improvements in Boiler Feedwater Heating and Purifying
Apparatus.
I JAMES EDMUND CARROLL, of 28 and 29 St. Swithin's Lane, in the City and
County of London, 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. :-
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 apply a relief-valve or valves, or other escape for steam from the feed
pipes or feed water purifying apparatus into the boiler and thereby prevent the
formation of a vacuum in these pipes or apparatus.
My invention will be readily understood by reference to the accompanying sheet
of drawing upon which :-
Figure 1 represents in section a boiler shewing position and arrangement of feed
water apparatus having my relief valve applied thereto.
Figure 2 is a plan of same as seen from above.
Figure 3 is a vertical section drawn to an enlarged scale shewing the construction
of the relief-valve.
Figure 4 is a plan of same

page_text: B the purifying apparatus.
C openings in same for discharge into boiler.
D the relief-valve.
E feed check valve.
When there is an excess of pressure within the apparatus B, the valve D
automatically opens and steam escapes therefrom into the boiler; the pressure
having been thus relieved the valve D automatically closes.
I have found the arrangement of automatic check valve within the boiler as
illustrated on the drawing to answer well and to be greatly preferable to the use of
any spring relief-valve within the boiler; a spring relief-valve might however be
applied to the feed water purifying apparatus outside of the boiler, or 1 may attain
the object of my invention by simply making a small perforation in an air chamber
or pipe elevated above the apertures or discharge into the boiler and place a relief
valve on any part of the purifying apparatus which I may in practice find suitable.
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 apparatus for heating and purifying feed water before its introduction into
the boiler the combination therewith of a relief-valve substantially as described for
the purpose specified.
2. In apparatus for heating and purifying feed water before its introduction into
the boiler, the valve D, in combination with the purifying apparatus B, substantially
as above described and shewn on the accompanying drawing.
For the Applicant,
W. E. GEDGE,
Agent.
ICO under Canon
T