AN IMPROVED DISTRIBUTING VALVE FOR ENGINES AND PUMPS
Year: 1884

page_text: I, CHARLES DENTON ABEL, of No 28 Southampton Buildings Chancery Lanc in
the County of Middlesex, Consulting Engineer and Patent Agent, do hereby
declare the nature of my invention for "AN IMPROVED DISTRIBUTING VALVE FOR
ENGINES AND PUMPS" to be as follows:-
This invention consists in a rotary chambered distributing valve by which the
openings or ports through which steam, gas or water is distributed in steam or
gas engines, pumps etc. are alternately covered and uncovered in the same manner
as by a common D valve.
For this purpose the valve is constructed as a cylinder having a number of
recesses or chambers formed on its periphery separated from each other by means
of projecting ribs lying parallel with the axis of the cylinder, and closed at the
ends by circular flanges thereon. The faces or edges of these ribs and flanges fit
against a corresponding concave face in the valve box in which face the ordinary
ports for the admission and exhaust of steam & are formed. Continuous rotary
motion being imparted to the cylindrical valve by means of any suitable gear, each
chamber thereof will pass in succession over the admission and exhaust ports and
will act as an ordinary D slide valve in relation thereto, that is to say, assuming
the ordinary arrangement of one exhaust port, between two admission ports: the
one chamber of the valve will first pass over and connect the one admission port
with the exhaust port while the other admission port is left open to the valve
chest so that steam can enter it; the chamber will then pass over this second
admission port, closing it against steam, and connecting it with the exhaust, while
at the same time the chamber will leave the first port free for steam to enter.
On the further motion of the valve, the next chamber thereof will pass over the
first port, closing it against steam and causing it to communicate with the
exhaust, while at the same time the first named chamber will have uncovered the
second admission port so as to allow steam to enter, and so on continuously.

page_text: COMPLETE SPECIFICATION.
I, CHARLES DENTON ABEL, of No 28 Southampton Buildings, Chancery Lane
in County of Middlesex, Consulting Engineer and Patent Agent, do hereby
"AN IMPROVED DISTRIBUTING VALVE
declare the nature of my invention for
FOR ENGINES AND PUMPS" and in what manner the same is to be performed to
be particularly described and ascertained in and by the following statement :-
This invention consists in a rotary chambered distributing valve by which the
openings or ports through which steam, gas or water is distributed in steam or
gas engines, pumps etc are alternately covered and uncovered in the same manner
as by a common D valve.
For this purpose the valve is constructed as a cylinder having a number of
recesses or chambers formed on its periphery separated from each other by means
of projecting ribs lying parallel with the axis of the cylinder, and closed at the
ends by circular flanges thereon. The faces or edges of these ribs and flanges fit
against a corresponding concave face in the valve box in which face the ordinary
ports for the admission and exhaust of steam &c are formed. Continuous rotary
motion being imparted to the cylindrical valve by means of any suitable gear, each
chamber thereof will pass in succession over the admission and exhaust ports and
will act as an ordinary D slide valve in relation thereto, that is to say, assuming
the ordinary arrangement of one exhaust port, between two admission ports: the
one chamber of the valve will first pass over and connect the one admission port
with the exhaust port while the other admission port is left open to the valve
chest so that steam can enter it; the chamber will then pass over this second
adinission port, closing it against steam, and connecting it with the exhaust, while
at the same time the chamber will leave the first port free for steam to enter.
On the further motion of the valve, the next chamber thereof will pass over the
first port, closing it against steam and causing it to communicate with the
exhaust, while at the same time the first named chamber will have uncovered
the second admission port so as to allow steam to enter, and so on continuously.
The accompanying drawings shew the above described improved construction of
distributing valve, as applied to a steam engine. Fig. 1 is a transverse section
of the same, Fig. 2 is a longitudinal section, and Figs. 3 to 10 shew the seven
most important positions the valve assumes while rotating in the direction indicated
by the arrow.
In all these figures, like letters indicate like parts.
The rotary chambered valve A is of cylindrical shape and is keyed on a shaft B.
On its circumference, a certain number of chambers are formed by longitudinal
ribs a a and end flanges or rings which surround the cylindrical surface, perpen-
dicularly to the said ribs. In the drawing, five chambers are shewn, but the
number of chambers could, obviously be any other. As may be easily seen from
the drawing, each chamber with the two ribs bordering the same does the office of
a common shell valve, the said ribs replacing the flanges of the D valve. If the
rotary chambered valve has n chambers, 1/2 th of its revolution will produce the
same distribution as one to-and-fro motion of a reciprocating D valve.
the direction in which this rotary chambered valve is rotated is arbitrary, it can
As

page_text: be geared with the main driving shaft in any desired manner. In like manner as
with a reciprocating D valve, inside-lap and outside-lap may be given to the
rotary chambered valve, as shewn in the example represented by the drawing.
Fig. 3 shews the position of the rotary valve in the moment when admission of
steam begins at the right hand; Fig. 4 represents the valve in the position it has
when the admission into the right hand port is about to terminate; Fig. 5 illustrates
the moment when exhaust through the left hand port is over; Fig. 6 the beginning
of the exhaust through the right hand port; Fig. 7 the beginning of admission
into the left hand port; Fig. 8 admission into the left hand port about to terminate;
Fig. 9 the termination of escape on the right side; Fig. 10 the beginning of escape
on the left side.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
1. The use of a rotary chambered valve for the distribution of steam, gas, water
and other agents in steam, water or gas engines, pumps and similar machines,
which valve consists of a cylinder adapted to be rotated continuously in one
direction and having its convex surface divided by a number of longitudinal ribs
and two end flanges into a number of chambers, each of which performs the office
of a reciprocating D valve during one to-and-fro motion substantially as herein
described.