A New or Improved Steam Valve or Nozzle, specially designed for Forced Draught Systems
Year: 1894

page_text: Date of Application, 6th Oct.. 1894
Complete Specification Left, 6th Aug., 1895-Accepted, 7th Sept., 1895
PROVISIONAL SPECIFICATION
A New or Improved Steam Valve or Nozzle, specially designed for
Forced Draught Systems.
1, ALEXANDE MILLER LAWSON, of 81 Northcote Street, South Shields, in
the County of Durham, Engineer, do hereby declare the nature of this invention
to be as follows
-
This invention clates to a new or improved steam valve o nozzle specially
designed tor forced draught systems
To effect my purpose I propose to construct the valve aud casing thereof as the
case may be of a tapered or comical form so that steam passing it from the inside
shall issuo in diverging instead of in converging lines
The valve may be situated when in use inside the an entry tube or close to its
mouth
Steam will be led to the valve chamber and when the valve is open the steam
will issue all round the periphery of the tapered valve o casing in diverging
dnections so as to create great suction of an towards and through the air entry
tube or tubes and past the valve.
The valve spindle will be continued backwards and fitted with a hand wheel for
working the spindle back or forward in its screwed casing, thus the valve can be
adjusted to any required degice of opening on it can be closed entirely
Dated this 5th day of October 1894.
A. CRAWHALL CHAPMAN,
3 St. Nicholas Buildings Newcastle-on-Tyne, Patent Agent.
COMPLETE SPECIFICATION.
A New or Improved Steam Valve or Nozzle, specially designed for
Forced Draught Systems.
1, ALEXANDER MILLER LAWSON of 81 Northcote Street, South Shields in
the County of Durham, Engineer, do uereby 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 a new or improved steam valve or nozzle specially
designed for forced daught systems
To effect my purpose I construct the valve and its surrounding casing both of a
tapered on comical form so that steam passing from the side of the casing shall
186ue in diverging instead of in converging dnections
I will descube my invention with reference to the accompanying diawings in
which Figure is a central longitudinal section and Figure 2 an end elevation.
Sumlar marks of reference designate similar parts.
A is the valve of the form shown tapered or expanding towards the furnace, it
is fixed to the end of spindle D and both air carried ma casing the inner end of
which, B, 18 also coned or tapered correspondingly with the valve Ct the mam
steam mlet to the valve and casing. The spindle is mounted in the casing as
Pics Ad

page_text: shown and fitted with a hand-wheel E for operating same to adjust the degree of
valve opening.
The fitting is situated inside the air enti y tube, as usually employed and arranged,
and at or near its mouth
In use, when the valve is opened the steam will issue all round between the
periphery of the tapered valve and its tapered casing in diverging directions and in
the form of a hollow diverging annular cone and will thus induce and create great
suction of air towards and through the air entry tube or tubes and past the valve
into the furnace
Having now particularly descubed and ascertamed the nature of my said inven-
tion and in what inanue the same is to be performed 1 declare that what I
claim 19:-
In a forced draught fitting such as is hiciembefore referred to the arrangement
and use of a coned casing fitting and surrounding the adjustable steam valve
whereby the issuing steam diverges in the form of a hollow annular
substantially as and for the purpose specified.
Dated this 3rd day of August 1895
cone
A. CRAWHALL CHAPMAN,
3 St. Nicholas Buildings, Newcastle-on-Tyne, Patent Agent,