Improvements in the Blast-pipes of Locomotives and other High-pressure Engines.
Year: 1890

page_text: Date of Application, 24th Jan., 1890
Complete Specification Left, 27th Aug, 1890-Accepted, 27th Sept.. 1890
PROVISIONAL SPECIFICATION.
Improvements in the Blast-pipes of Locomotives and other
High-pressure Engines.
1 WATSON WALKER, of Rosslyn, Folkestone Road, Dover, in the County
of Kent, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in the blast pipes of locomotives and other
high pressure engines.
In ordinary blast pipes the nozzle is generally of a fixed area for each class of
engine, when it is well known that better results would be obtained if this area could
be regulated. The object of my invention is the regulation of the nozzle area from
any given minimum to any given maximum, and it consists in a nozzle having
an annular port with a sliding valve and emitting in a perfectly circular form
the steam under all conditions of its regulation, and at all points, with the least
possible obstruction.
My invention will be readily understood from the following description reference
being had to the accompanying sheet of drawing upon which
Figure 1 is a sectional elevation showing my improved regulating blast pipe in its
normal closed position,
Figure 2 is a similar view the pipe being open,
Figure 3 is a side elevation thereof and
Figure 4a plan view of same; similar letters of reference indicating similar parts
in each of the figures respectively.
A is the blast pipe. B the nozzle. O is an annular port. D) a sliding circular
valve. E E are studs by means of which this valve may be raised or lowered by levers
or in any other convenient manner.
At Figure 1 the valve 1) is shown in its highest position, therefore the annular port(
is closed the blast then issuing from the central orifice in the usual manner; this
orifice being the minimum area.
At Figure 2 the valve D is shown in its lowest position, the annular port C being
then fully opened thereby relieving the pressure in the blast pipe A, and the blast jet
area is then equal to the central nozzle area plus the area of the annular port C and
this is the maximum nozzle area. It will be obvious that the sum of these two areas
may by means of the sliding valve D be regulated to any extent between the maximum
and minimum area, thereby increasing or diminishing the pressure in the blast pipe A
and correspondingly the force of the issuing jet of steam; the benefit of which is well
known to those in charge of locomotives, as well as the great value of the steam
being emitted in a perfectly circular form under all circumstances of its regulation,
at all points, with the least obstruction.
Dated this Twenty-fourth day of January 1890.

page_text: COMPLETE SPECIFICATION.
Improvements in the Blast-pipes of Locomotives and other
High-pressure Engines.
I WATSON WALKER, of Rosslyn, Folkestone Road, Dover, in the County of Kent,
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 improvements in the blast pipes of locomotives and other
high pressure engines.
In ordinary blast pipes the nozzle is generally of a fixed area for each class of
engine, when it is well known that better results would be obtained if this area could
be regulated. The object of my invention is the regulation of the nozzle area from
any given minimum to any given maximum, and it consists in a nozzle having an
annular port with a sliding valve and emitting in a perfectly circular form the steam
under all conditions of its regulation, and at all points, with the least possible
obstruction.
My invention will be readily understood from the following description
reference being had to the sheet of drawing left with the Provisional Specification
upon which
Figure 1 is a sectional elevation showing my improved regulating blast pipe in its
normal closed position,
Figure 2 is a similar view the pipe being open,
Figure 3 is a side elevation thereof and
Figure 4 a plan view of same; similar letters of reference indicating similar parts
in each of the figures respectively.
A is the blast pipe. B the nozzle. O is an annular port. D a sliding circular
valve. EE are studs by means of which this valve may be raised or lowered by
levers or in any other convenient manner.
At Figure 1 the valve D is shown in its highest position, therefore the annular
port C is closed the blast then issuing from the central orifice in the usual manner;
this orifice being the minimum area.
At Figure 2 the valve D is shown in its lowest position, the annular port C being
then fully opened, thereby relieving the pressure in the blast pipe A, and the blast
jet area is then equal to the central nozzle area plus the area of the annular port C
and this is the maximum nozzle area. It will be obvious that the sum of these two
areas may by means of the sliding valve D be regulated to any extent between the
maximum and minimum area, thereby increasing or diminishing the pressure in the
blast pipe A and correspondingly the force of the issuing jet of steam, the benefit of
which is well known to those in charge of locomotives, as well as the great value of
the steam being emitted in a perfectly circular form under all circumstances of its
regulation, at all points, with the least obstruction.
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 a blast pipe for locomotives and other high pressure engines a nozzle having
an annular port with a sliding valve, constructed, combined and arranged to operate
substantially as herein before described for the purpose specified.
2. The blast pipe for locomotives and other high pressure engines hereinbefore
described and illustrated on the drawing.
Dated this Twenty-seventh day of August 1890.