Steam, Hydraulic, or other Motive Power Engines.
Year: 1887

page_text: Date of Application, 9th Feb., 1887
Complete Left, 9th Nov., 1887
Complete Accepted. 9th Dec.. 1887
for Steam, Hydraulic, or other Motive Power Engines.
I, CUTHBERT FREDERICK THOMPSON of Gateshead upon Tyne, Northumberland,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has for its object improvement in steam, hydraulic, or other motive
power engine reversing valves, and consists mainly in replacing the ordinary slide
valves by one of a peculiar construction communicating with another regulating valve
by two steam passages or pipes, one of which acts as an exhaust and the other as a
steam admission passage when the engine is running in one direction and "vice
versa "when the engine is reversed and running in the other direction.
The regulating valve is operated by a hand lever or any other convenient arrange-
ment, the intermediate position of which said regulating valve stops the admission of
steam to both passages, but on either side of the said intermediate point by admitting
steam to one or other of the steam passages or pipes communicating with the slide
valve of a peculiar construction, and so to one or other of the said valve, the engine is
caused to run in the desired direction.
According to my invention, I make the slide valve to slide against or upon two
surfaces, one at the side and one at the bottom of the valve. In the sideface in the
steam chest of the cylinder I have only the two steam ports, one leading to each end
of the cylinder, the usual exhaust port being omitted. In the bottom face I have two
ports of any desired shape which communicate with or form part of the two passages
or pipes before mentioned and leading to the regulating valve. These faces may be
made at any angle to each other although I preferably make them at right angles.
The slide valve is so constructed that the steam, air, or other fluid, by which the
engine is worked, can only gain admission to the cylinder by means of the two
passages or pipes communicating with the regulating valve, although the slide valve
itself works inside the steam chest in the usual way.
In the side face of this slide valve I have the exhaust recess as usual, except, that
I make an opening or port leading into it from the bottom face and communicating
with one of the aforesaid passages, for instance, No. 1 leading to the regulating

page_text: valve, the edges of the recess regulating the admission and exit of steam in the
usual way.
I make also in this case the edges on the ends of the valve act in the same way
as what are called the steam edges of an ordinary D shaped slide valve, thus I have
as regards the admission and exit of steam directly to the cylinder, an ordinary
D slide valve but to make a valve suitable for my purpose I carry round the back or
top of this D valve a covered passage and make a port or opening leading out of
this passage through the bottom of the valve to communicate with the other or No. 2
passage leading to the regulating valve. This passage round the valve being covered
in it makes the two ports, one at each end, in the side face of the valve and as the
covering is level with the side face, it also prevents the steam from entering the
cylinder except through the passages before mentioned.
These two ports are beyond the steam edges of the valve and the steam enters
through them into the cylinder in the same manner as if the steam edges were open
direct to the steam chest. The ports in the bottom face of the slide valve and the
ports in the face on which it works, are so arranged that in whatever part of its
travel the valve may be, there is always a full area for the admission and exit of
steam.
The manner of working is as follows:-
If the regulating valve is placed so as to allow the steam to flow through the
passage No. 1, that is through the passage leading to what is called the exhaust recess
of the valve, then passage No. 2 will act as an exit or exhaust passage for the steam,
the exhaust edges of the valve being turned into steam edges and the steam edges into
exhaust edges.
Supposing the regulating valve be moved so that the steam is allowed to flow
through No.
passage, that is, through the passage leading to the ports or outside
edges of the slide valve the action will be immediately changed, the steam going past
them in the usual manner and the exhaust steam going through No. 1 passage, thus
allowing the steam to flow into the opposite end of the cylinder and so immediately
reverse the engine.
Dated this 9th day of Tabuar 1987
H. GARDNER,
166, Fleet Street, London,
Agent for the said C. F. Thompson.

page_text: for Steam, Hydraulic, or other Motive Power Engines.
I CUTHBERT FREDERICK THOMPSON of Gateshead upon Tyne, Northumberland
Engineer, do hereby declare the nature of my said 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 has for its object improvement in steam, hydraulic or other motive
power engine reversing valves and consists mainly in replacing the ordinary slide
valves by one of a peculiar construction communicating with another regulating valve
by two steam passages or pipes, one of which acts as an exhaust and the other as a
steam admission passage when the engine is running in one direction and "vice
versa" when the engine is reversed and running in the other direction.
The regulating valve is operated by a hand lever or any other convenient arrange-
ment the intermediate position of which said regulating valve stops the admission of
steam to both passages, but on either side of the said intermediate point by admitting
steam to one or other of the steam passages or pipes communicating with the slide
valve of a peculiar construction and so to one or other of the said valve the engine
is caused to run in the desired direction.
According to my invention which I show in the annexed drawings Figures 1, 2
and 3 I make the slide valve A to slide against or upon two surfaces B, C, one at the
side and one at the bottom of the valve. In the side face in the steam chest of the
cylinder I have only two ports DE one leading to each end of the cylinder the usual
exhaust port being omitted. In the bottom face C I have two ports F, G, of any
desired shape which communicate with or form part of the two passages or pipes
before mentioned and as shown in dotted lines Figure 2, and leading to the regulating
valve H. The faces BC may be made at any angle to each other although I preferably
make them at right angles.
The slide valve A is so constructed that the steam, air or other fluid by which the
engine is worked can only gain admission to the cylinder by means of the two
passages or pipes communicating with the regulating valve H although the slide
valve itself works inside the steam chest I in the usual way.
In the side face B of this slide valve I have the exhaust recess as usual except that
I make an opening or port leading into it from the bottom face and communicating
with one of the aforesaid passages, for instance G leading to the regulating valve,
the edges of the recess regulating the admission and exit of steam in the usual way.
I make also in this case the edges on the ends of the valve A act in the same way as
what are called the steam edges of an ordinary D shaped slide valve, thus I have as
regards the admission and exit of steam directly to the cylinder, an ordinary D slide
valve, but to make a valve suitable for my purpose I carry round the back or top of
this D valve a covered passage and make a port or opening leading out of this passage

page_text: through the bottom of the valve to communicate with the other or F passage leading
to the regulating valve H. This passage round the valve being covered in it makes
the two ports one at each end in the side face of the valve and as the covering is
level with the side face it also prevents the steam from entering the cylinder except
through the passages before mentioned.
These two ports are beyond the steam edges of the valve and the steam enters
through them into the cylinder in the same manner as if the steam edges were open
direct to the steam chest. The ports in the bottom face C of the slide valve and the
ports in the face on which it works are so arranged that in whatever part of its
travel the valve may be, there is always a full area for the admission and exit of
steam.
The manner of working is as follows:-
If the regulating valve H is placed so as to allow the steam to flow through tho
passage G that is through the passage leading to what is called the exhaust recess of
the valve then the passage F will act as an exit or exhaust passage for the steam, the
exhaust edges of the valve being turned into steam edges and the steam edges into
exhaust edges.
Supposing the regulating valve be moved so that steam is allowed to flow
through F passage, that is, through the passage leading to the ports or outside edges
of the slide valve the action will be immediately changed, the steam going past them
in the usual manner and the exhaust steam going through G passage, thus allowing
the steam to flow into the opposite end of the cylinder and so immediately reverse
the engine.
The features of novelty in my invention are
1. The slide valve is of peculiar construction it having two faces proferably at right
angles one to the other each with double ports.
2. The steam face of the cylinder has two admission ports but no positive exhaust
port the steam being exhausted through either of the steam ports in the valve.
3. Steam pressure is always upon the outside of the slide valve so that said valve
is always kept pressed against the faces.
4. The regulating valve for reversing the motion works upon a steam face with two
admission and one exhaust passage.
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
In steam, hydraulic or other motive power engines a two faced D valve each face
being provided with two ports supplied with the motive agent through a regulating
valve for determining the action of the main pistons as described and substantially as
shown by the annexed drawings.