Improvements in the snape or Allowing Exhausted Steam to Leave Steam Cylinders, commonly called "Steam" and "Exhaust" Valves.
Year: 1898

page_text: Improvements in the snape or
Allowing Exhausted Steam to Leave Steam Cylinders, commonly
called "Steam" and "Exhaust" Valves.
We, ROBERT HENRY MORRIS, of 180, Downham Street, Blackburn, in the County
of Lancaster, Engineer, and THOMAS ALEXANDER ASPDEN, Junior, of Sykes Holt,
Balderstone, near Blackburn, aforesaid, Engineer, do hereby declare the nature
of this invention to be as follows:
-
This invention consists of improved shape of valves to admit and exhaust steam
to and from steam cylinders, the valves being of simple construction, and of such
a shape as to reduce the length of steam passages or ports to a minimum, thereby
reducing the "clearance" or the space connected with the inside of a cylinder
in which the steam does no work, so that these valves will reduce the quantity of
steam used at each stroke.
The valves according to this invention are in the form of an arc, which partially
encircles the cylinder, and cover the ports or steam passages of the cylinder.
They may have one or more oblong openings or ports through each valve corre-
sponding with the ports or steam passages in the cylinder as in the ordinary grid
or slide valve.
Fach steam cylinder would require one steam valve and one exhaust valve at
each end, making a total of two steam valves and two exhaust valves, or four
valves in all.
The steam valves are bored the same radius as the outside of the cylinder, upon
which they move. The pressure of steam in the steam chest being greater than
the pressure of steam in the cylinder when the valve is closed, will force the valve
tight on the cylinder and thus make it steam tight.
The exhaust valves are bored on the inside and turned on the outside, or the
side furthest away from the centre of the cylinder, to coincide with the bored
part of the exhaust chest or a loose seating or grid with openings or ports
through to correspond with those in the valve, thus the exhaust valves will work
between the inside of the cylinder and their respective valve seats or chest, so
that the steam which is of a greater pressure in the cylinder than in the exhaust
chest. will force the valve tight against its seat or chest and when the valve is
closed thus keep it steam tight.
These valves may be moved or actuated backward and forward, either longi-
tudinally along the cylinder, or radially round the axis of the cylinder by means
of spindles, or levers, or dies, or any ordinary or well known method of opening
and closing the steam and exhaust valves to a cylinder, there being pockets or

page_text: preparations cast on or secured to the valves for the levers, dies, or spindles to
give the valves the motion required.
Dated this 92nd dux of Luna 1900
ROBERT HENRY MORRIS,
THOMAS A. ASPDEN, JUNIOR.
Improvements in the Shape of Valves for Admitting Steam to, and
Allowing Exhausted Steam to Leave Steam Cylinders, commonly
called "Steam" and "Exhaust" Valves.
We, ROBERT HENRY MORRIS, of 180, Downham Street, Blackburn, in the County
of Lancaster, Engineer, and THOMAS ALEXANDER ASPDEN, Junior, of Sykes Holt,
Balderstone, near Blackburn, aforesaid, Engineer, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be particu-
larly described and ascertained in and by the following statement:-
This invention consists of an improved shape of valves, to admit and exhaust
steam to and from steam cylinders. The valves being of simple construction, and
of such a shape as to reduce the length of the steam passages or ports to a mini-
mum, thereby reducing the "clearance or the space connected with the inside
of a cylinder in which the steam does no work.
In the accompanying drawing
"
Figure 1 represents a longitudinal section of a steam cylinder shewing one
method how these valves could be arranged.
Figure 2 is a cross section through the valves and ports of above mentioned
cylinder.
Figure 3 is a plan of above mentioned cylinder, which covers removed from
boxes, shewing valves.
Figures 5, 6, 7, 8 are front and end elevations of the valves alone.
The valves, according to this invention and as shewn in Figures 5 and 7 are in
the form of an arc which partially encircles the cylinder and are placed in a
position to work over the ports or steam passages of the cylinder. They may be
made blank or have one or more openings or ports through each as in the ordinary
grid or slide valve. The steam or admittance valves A, A1 are bored a suitable
radius to fit the out side of the cylinder upon which they move, and which is
enclosed by the valve box or steam chest, so that the pressure of the steam in the
valve box or steam chest which acts on the back or convex side of the valve, being
greater than the pressure of the steam inside the cylinder, will, when the valve is
closed, force it against the body of the cylinder and thus make a tight joint.
The exhaust valves B, B1 are machined on the convex side or outside, being
the side farthest away from the centre of the cylinder, to fit upon the cylinder
barrel, or casing, or upon a loose seating or grid with ports or openings through,
arranged suitable for each valve. It is preferable to have the exhaust valve or
valves, to work between the inside of the cylinder and its or their respective
seatings or facings upon which it or they move, sc that the pressure of stean
which is greater in the cylinder than in the exhaust steam chest, will act upon
the inside or concave side of the valve and force it against its seating or facing,
and when the valve is closed thus make a tight joint.
These valves may be moved or actuated backward and forward, either longi-
tudinally along the cylinder, or radially about the axis of the cylinder, by means

page_text: of any arrangement of spindles, levers and dies, or any method of opening and
closing the steam and exhaust valves of a cylinder.
Suitable preparations may be made on the valves so as to adapt them to be
actuated by any means of spindles, levers and dies or other method to give them
the required motion.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
(1) Valves so shaped that they fit and work on, the concave and convex portions
of a cylinder, or loose part to a cylinder, whereby they reduce the distance from
the valves to the inside of the cylinder, substantially as described.
ROBERT HENRY MORRIS,
THOMAS ALEXANDER ASPDEN,
Applicants.
ROBERT HENRY MORRIS,
THOMAS ALEXANDER ASPDEN,
Applicants.