Year: 1888

page_text: WEDEN
Date of Application, 1st May, 1888
Complete Specification Left, 16th Jan., 1889
Complete Specification Accepted, 16th Feb., 1889
A communication from ANDREW TOLTON, of the City of Guelph, in the County of
Wellington, in the Province of Ontario, Canada, Machinist.
I ALFRED JULIUS BOULT of 323 High Holborn, in the County of Middlesex,
M.I.M.E. do hereby declare the nature of this invention to be as follows:-
The object of the invention is to design a valve which will cut off the live steam
from the engine cylinder on one side of the piston at any desired point in the stroke,
while keeping the exhaust port on the opposite side of the piston open during the
full stroke desired; and it consists, essentially, of a cylindrical valve which will revolve
continuously in one direction while the engine is in motion, and is fitted into a cylin-
drical chamber having one or two steam ports leading to the end or ends of the engine
cylinder, the said valve 'having one or more steam ports and one or more exhaust ports
formed in it in such a manner that the revolving of the said valve within its chamber
shall cause live steam to be admitted alternately into the opposite ends of the engine
cylinder and be cut off at a fixed point in the stroke of the piston, while the corre
sponding exhaust port communicating with the engine cylinder port leading to the
opposite side of the piston remains open any desired length of the stroke.
A variable cut-off is also provided by extending the cylindrical valve into the steam-
chest, and placing on the said extension a sleeve connected to a governor of the
ordinary pattern, and having ports in it to communicate with ports leading to the main
steam ports in the valve, the ports in the sleeve being so arranged that the motion of
the governor. shall, by adjusting the sleeve, cut off earlier or later the supply of steam
to the engine in proportion to the load it may be driving.

page_text: A communication from ANDREW TOLTON, of the City of Guelph, in the County of
Wellington, in the Province of Ontario, Canada, Machinist.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex, M.I.M.E.
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 :-
The object of this invention is to design a valve which will cut off the live steam
from the engine cylinder on one side of the piston at any desired point in the stroke,
while keeping the exhaust port on the opposite side of the piston open during the full
stroke desired; and it consists essentially of a cylindrical valve which will revolve
continuously in one direction while the engine is in motion and is fitted into a cylin-
drical chamber having one or two steam ports leading to the end or ends of the engine
cylinder the said valve having one or more steam ports and one or more exhaust ports
formed in it in such a manner that the revolving of the said valve within its chamber
shall cause live steam to be admitted alternately into the opposite ends of the engine
cylinder and be cut off at a fixed point in the stroke of the piston while the corre-
sponding exhaust port communicating with the engine-cylinder-port leading to the
opposite side of the piston remains open any desired length of the stroke. A variable
cut-off is also provided by extending the cylindrical valve into the steam chest and
placing on the said extension a sleeve connected to a governor of the ordinary pattern
and having ports in it to communicate with ports leading to the main steam ports in
the valve the ports in the sleeve being so arranged that the motion of the governor
shall, by adjusting the sleeve, cut off earlier or later the supply of steam to the engine
in proportion to the load it may be driving.
Fig. 1 is a longitudinal section through a-b.
Fig. 2 is a cross section through c-d.
Fig. 3 is an end section of the steam-chest main valve and cut off-valve.
Fig. 4 is a perspective detail of the main valve.
Fig. 5 is a perspective detail of the cut-off valve.
Fig. 6 is a section of the main valve through the exhaust port.
Fig. 7 is a section of the main valve through the steam port.
In the drawings A represents a cylindrical valve which is fitted into a correspond-
ingly-shaped chamber preferably located below the engine cylinder B as indicated. C
and D are the two ordinary cylinder-ports leading from the ends of the cylinder A
into the chamber filled by the valve A.
E is a passage way made through the valve A and owing to the relative positions
of the ports C, D the said passage-way constitutes the two steam-ports of the valve A
as will be understood as the description proceeds. The passage-way or ports E com-
municate with the ports F-which are made.in.that portion of the valve A projecting

page_text: into the steam chest G. H are two exhaust ports made in the valve A and designed
to communicate with the exhaust chamber I from which, the steam escapes in the
ordinary way. The valve A is connected in any suitable manner to some moving part
of the engine so that the said valve shall continue to revolve in one direction during
the time that the engine is in motion. As shown in figure 1 it is supposed to be
revolving in the direction of the arrow. The port E has just passed the cylinder
port D and the steam is thus cut-off at about the time that the piston J has reached
one-third of the stroke. It will be observed that the exhaust-port H is still open so
that the exhaust steam will escape freely from the cylinder both during the period
that the live steam is being admitted into the cylinder on the opposite side of the
piston and during the period that the live steam is cut off and the piston is being
moved simply by the expansion of the steam. Back pressure in the cylinder is
entirely avoided and consequently the engine will do better_service when supplied
with the valve made as described. By the time that the port E reaches the cylinder-
port C the exhaust port H has reached the cylinder-port D and so the operation is
repeated on the opposite end of the piston J.
In the drawings, to illustrate this invention, only two steam ports and two exhaust
ports are shown. In some cases more, and sometimes less ports are used. If more
ports are used the valve A will simply be made to revolve more slowly; if less ports
are used the valve revolves more quickly. In either case the valve revolves con-
tinuously and the operation and effect described will be exactly the same. As the
admission of steam into the ports E will heat the valve A and cause it to expand a
steam space K is formed around the valve-chamber which steam space communicates
with the steam chest G so that the steam admitted into the said chest heats the wall
of the valve chamber and causes it to expand with the valve and thereby the valve A
is prevented binding in its chamber. As this valve is perfectly balanced the wear
will be unappreciable but in order to provide for even the slight wear due to the
continual revolving of the valve the said valve and its chamber are made slightly
tapered and a set screw L provided in the head of the exhaust chamber I which
set-screw butts against the end of the valve A so that by the adjustment of the said
set screw the said valve may be moved longitudinally in its chamber without any fear
of being too tightly forced into it.
With the view of providing a variable cut-off which will work in connection with
this valve a sleeve M is provided to fit that portion of the valve A which projects into
the steam chest G. It will be noticed that four ports N are made in the sleeve or
cut-off M and that these ports N correspond with the ports F made in the valve A.
I do not of course confine myself to any particular number of ports N or F but a
greater number of them are made than there are ports E so that a very small
movement of the cut-off sleeve M will expose a greater area of steam passage than the
same sized opening in each were there a less number.
O is a rod flexibly connected to the cut-off sleeve M and leading to the spindle of a
governor of any approved construction so that the movement of the said governor
shall adjust the cut-off sleeve M on the cylinder A closing the connection between
the ports N and F earlier or later as the load on the engine requires.
As shown in figure 3 the cut-off sleeve M has been adjusted by the action of the
governor in the opposite direction of the travel of the valve A causing the ports N in
the cut-off sleeve M to be out of line with the port CD thereby cutting off the steam
from the valve A before the ports in the said valve have passed the ports C D.
Should the load on the engine be increased the governor will cause the cut-off sleeve
to move in the opposite direction and thereby will not cut off the steam so soon.
will be seen that by the adjustinent of the cut-off sleeve the steam will be cut off
sooner or later from the main valve A as may be required to suit the load on the
engine. It will be noticed that the sleeve M is divided and is provided with adjusting
screws m for the purpose of taking up any appreciable wear on the seat of the
cut-off sleeve.
It
It will be understood that instead of a governor the cut-off sleeve M may be
operated by an ordinary lever and it will also be understood that a valve A may be

page_text: •
provided for each separate cylinder-port and that if desired live steam may be used
for the whole length of the stroke. The great point secured by this invention is the
fact that the steam may be cut-off at any desired point in the stroke and that the
exhaust may be also so regulated by a very simple device.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, as communicated to
me by my foreign correspondent, I declare that what I claim is;-
1. A cylindrical valve fitted into a cylindrical chamber having ports communicating
with the ends of the cylinder one or more steam ports being made in the cylindrical
valve and connecting with the steam chest and one or more exhaust ports made in the
valve and arranged to communicate with the exhaust chamber the steam and exhaust
ports in the said valve being relatively arranged with each other in such a manner
that the revolving of the said valve within its chamber shall cause steam to be admitted
alternately into opposite ends of the engine cylinder and be cut off at a fixed point
in the stroke of the piston while a corresponding exhaust port communicating with
the engine cylinder port leading to the opposite side of the piston remains open any
desired length of the stroke substantially as and for the purpose specified.
2. A cylindrical valve fitted into a cylindrical chamber having parts com-
municating with the ends of the cylinder one or more steam ports being made in
the cylindrical valve and connecting with the steam chest and one or more exhaust
ports made in the valve and arranged to communicate with the exhaust chamber the
steam and exhaust ports in the said valve being relatively arranged with each other
in such a manner that the revolving of the said valve within its chamber shall cause
steam to be admitted alternately into opposite ends of the engine cylinder and be
cut off at a fixed point in the stroke of the piston while a corresponding exhaust port
communicating with the engine cylinder port leading to the opposite side of the
piston remains open any desired length of the stroke in combination with a cut-off
sleeve fitted on to the end of the cylindrical valve which projects into the steam
chest a rod being connected to the cut-off sleeve in such a manner that the action of
the governor or lever shall adjust the cut-off sleeve on the cylinder valve in such a
manner as to cut off the steam from the main valve sooner or later as required to
suit the load on the engine substantially as and for the purpose specified.
3. A cylindrical valve A having ports E and H as described and fitted into a
correspondingly formed chamber having a steam space K surrounding it and steam
ports CD leading to the ends of the cylinder substantially as and for the purpose
specified.
4. A cylindrical valve A having ports E communicating through the ports F with
the steam chest G and with the exhaust chamber I through the exhaust ports H in
combination with the cut-off sleeve M having ports N to correspond with the ports F
the said sleeve being operated by a governor or lever substantially as and the purpose
specified.
5. The tapered cylindrical valve A fitted into a correspondingly shaped chamber
and provided with ports as described in combination with the set screw L arranged
substantially as and for the purpose specified.
6. The combination with a revolving cylindrical valve having suitable steam
and exhaust ports to communicate with the engine cylinder ports of an adjustable
sleeve fitted on to the said cylindrical valve and having ports to communicate with the
ports of the latter.