Improvements in Slide Valves of Steam Engines, Steam Hammers, and the like, for Working Compound in One Cylinder.
Year: 1887

page_text: Date of Application, 13th Oct., 1887
Complete Specification Left, 12th July, 1888
Complete Specification Accepted, 17th Aug., 1888
Improvements in Slide Valves of Steam Engines, Steam Hammers,
and the like, for Working Compound in One Cylinder.
1 ALBERT CASE 120 Carver Street Sheffield in the County of York, Engineer, do
hereby declare the nature of this invention to be as follows:-
The object of my invention is to enable a steam Engine to work compound in one
cylinder instead of two as heretofore.
The steam is admitted at one end of the cylinder and after having forced the piston
forward to the other end, it is by my improved valve admitted to the other side of
the Piston, and the low pressure steam act in an opposite direction on the piston,
after having been expanded in the first instance.
In case of high pressure engines the low pressure steam is conducted to the
atmosphere in the usual way.
And in that of the condensing engine the low pressure steam, is taken to the
condenser and the vaccum act on the piston on one side, at the same time as the high
pressure steam is charging the opposite side.
My improved valve can be attached to any steam engine, that is worked by the
ordinary slide valve in use, and can be also worked in conjunction with the ordinary
cutt off slide valve, by this means a great saving of fuel & water is effected.
1
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page_text: and the like, for Working Compound in One Cylinder.
ALBERT CASE, 120 Calver Street Sheffield in the County of York, 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:-
The object of my Invention is to enable a Steam or other Engine to work compound
in one cylinder, instead of two as heretofore.
The Steam is admitted at one end of the cylinder, and after having forced the
Piston forward to the other end, it is by my improved valve admitted to the other
side of the Piston, and the low pressure steam acts in an opposite direction on the
Piston, after being expanded in the first instance.
In the case of the high pressure Engine the low pressure steam is conducted to the
atmosphere in the usual way, and in the case of the condensing Engine, the low pressure
Steam is taken to the condenser and the vaccum acts on the Piston on one side at the
same time as the high pressure steam is charging the opposite side of the cylinder.
My improved slide valve can be attached to any steain Engine that is worked by
the ordinary slide valve, and can also be used in conjunction with the ordinary cutt off
slide valves thus a saving of fuel and water is effected.
In order that my improved slide valve, may be clearly understood I will proceed to
explain the same by the aid of the following sheets of Diagrams, description and
refferance letters which are marked thereon.
Fig. 1, shows a longitudinal section of my improved valve A and the cylinder E E,
with steam chest I attached, the position of the valve A is just commencing to admit
the high pressure steam from the steam chest I into the steam port C C and thence to
the cylinder in the first instance. By this means the Piston H is forced forward
in the cylinder E E, towards the end of the cylinder at J.
Fig. 2, gives the position of the valve A when the Piston H is moving to the end of
cylinder at J, and also shows Exhaust port B opening and discharging the low
pressure steam from the cylinder.
On the Piston H, arriving at the end of the forward stroke at the end of the
cylinder at J; the valve A is moved into the position shown in Fig. 3, and is just
commencing to open the connection of the two steam Ports C C, in the cylinder E E,
by the passage D' through my valve A after which the expanded steam enters the end
of the cylinder at J and the Piston H is moved forward to its former position in the
cylinder the valve A assumes the position on the cylinder shown in Fig. 4. Thus
connecting the two Ports C C. in the cylinder E E, by the passage D through the
valve A, after which the low pressure steam is passed away by the exhaust Port B in
the usual way.

page_text: Fig. 5, shows a plan of the face of my improved valve, and the arrangement of the
exhaust port B and the passage D.
Fig. 6, shows a cross section through the center of the valve with the passage D
over the exhaust port B, various modifications of this valve may be made, but by
preferance I make the valve as shown; as an instance of this, there may be one or
more passages; and these plased at the sides, or in any convenient position through
the valve, to effect the same purpose and obtain the same result as before mentioned.
Having now particularly described and accertained the nature of my said inven-
tion, and in what manner the same is to be performed, that what I claim is,
1st. An improved slide valve having a separate passage or passages through it,
which passages will connect the two Ports of an Engine cylinder, so as to allow
pressure to pass from one side of the Piston to the other, and thereby use the
pressure compound in one cylinder instead of two as heretofore.