An Improvement in Apparatus for Regulating the Feed to Steam Boilers.
Year: 1896

page_text: Date of Application, 25th July, 1895
Complete Specification Left, 9th Apr.. 1897-Accepted, 22nd May, 1897
PROVISIONAL SPECIFICATION.
An Improvement in Apparatus for Regulating the Feed to Steam
Boilers.
I, ALFRED FERNANDEZ YARROW, of Isle of Dogs, Poplar, in the County of
London, Engineer, do hereby declare the nature of this invention to be as
follows:-
It has been proposed to supply the donkey engine employed for working the
feed pump of a steam boiler with steam from a pipe the inlet to which inside the
boiler is situated between the lowest and the highest water level, or can be
adjusted to any desired level so that, when the water attains too great a height,
water, instead of steam, passes to the donkey engine retarding or arresting it,
thereby lessening or stopping the feed supply and at the same time running off
superfluous water from the boiler.
My invention relates to an improvement in this apparatus whereby I provide
for the adjustment and effective action of the feed regulator. For this purpose
I joint the steam pipe which supplies the donkey engine in such a way that I can
raise or lower its inlet mouth according as the level of the water in the boiler
is desired to be higher or lower and I fix in the boiler under the mouth of the
pipe a perforated metal vessel which may be a cone fixed with its small end
downwards immersed to some depth in the water.
This vessel serves as a shield protecting the steam inlet from the priming
effects of ebullitions, whilst the comparatively still surface of the water within the
vessel maintains what may be considered the average level of the water in the
boiler. The vessel having perforations in its lower part by which the water level
inside is made to correspond with the average level outside of it, may be almost
entirely closed at the top admitting only the end of the steam pipe with sufficient
annular space around it for the passage of steam to the pipe, and additional shields
or deflectors may be applied to the vessel in cases where violent ebullition or
discharge of water from the boiler tubes into the steam space might tend to cause
priming.
Dated this 25th dox of Jul 1806
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improvement in Apparatus for Regulating the Feed to Steam
Boilers.
I, ALFRED FERNANDEZ YARROW, of Isle of Dogs, Poplar, in the 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 :-
It has been proposed to supply the donkey engine employed for working the

page_text: feed pump of a steam boiler with steam from a pipe the inlet to which insile the
boiler is situated between the lowest and the highest water level so that, when
the water attains too great a height, water instead of steam, passes to the donkey
engine retarding or arresting it, thereby lessening or stopping the feed supply
and at the same time running off superfluous water from the boiler.
My invention relates to an improvement in this apparatus whereby I provide for
the adjustment and effective action of a feed regulator of this kind. For this
purpose I arrange the regulator as I shall describe referring to the accompanying
drawing which is a longitudinal section of the steam and water drum of a water
tube boiler. I joint the pipe A which supplies the donkey engine in such a way
that by means of a lever B having its axis passing through a stuffing box I can
raise or lower its inlet mouth a according as the level of the water in the boiler
is desired to be higher or lower. I fix in the boiler under the mouth of the pipe A
a perforated metal vessel C which may be, as shewn, a cone fixed with its small
end downwards immersed to some depth in the water.
This vessel serves as a shield protecting the steam inlet a from the priming
effects of ebullitions, whilst the comparatively still surface of the water within the
vessel maintains what may be considered the average level of the water in the
boiler. The vessel having perforations in its lower part by which the water level
inside is made to correspond with the average level outside of it, may be almost
entirely closed at the top admitting only the end of the steam pipe with sufficient
annular space around it for the passage of steam to the pipe, also additional shields
or deflectors may be applied to the vessel in cases where violent ebullition or
discharge of water from the boiler tubes into the steam space might tend to cause
priming.
The lever B may be adjusted by a screw D which holds it in position. E is
the valve on the pipe which feeds the boiler, and F is the valve on the steam
pipe which supplies the donkey engine.
As the pipe A is usually of small diameter, and as the range of its adjustment
is not great, the jointing of the pipe may in many cases be dispensed with, the
pipe itself being sufficiently flexible to allow of the required adjustment.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
In combination with the jointed or flexible steam pipe supplying a donkey feed
engine a perforated shield and an adjusting lever, substantially as and for the
purpose set forth,
Dated this 9th day of April 1897.
ABEL & IMRAY,
Agents for the Applicant.