Improvements in Valves Used for the Admission and Release of Steam Supplied to Cylinders of Steam and other Motive Engines,
Year: 1898

page_text: Date of Application, 26th Oot., 1898-Accepted, 29th July, 1899
Improvements in Valves Used for the Admission and Release of
Steam Supplied to Cylinders of Steam and other Motive Engines,
I, CHARLES GESSERT, of Number 287, King Street, Melbourne, in the County
of Bourke, in the Colony of Victoria, Mechanical 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:
My invention relates to improvements in valves used for the admission and
release of steam supplied to cylinders of steam and other motive engines, and has
for its object the construction of a simple form of circular valve of gun or other
hard metal, which is made to rotate in the steam chest of the cylinder of a steam
or other motive engine whether supplied by steam or fluid. To give free admis-
sion to steam or fluid, to provide a sudden and perfect cut off with an improved
release a reduction of pressure upon and decreased friction of valve when working,
with reduced back pressure on piston and a saving of from thirty to fifty per
cent. in steam used.
In order that my invention may be clearly rendered, reference may be had to
the accompanying sheet of drawings, in which Figure 1 is a side elevation,
Figure 2 a sectional elevation through the line e.f., Figure 3 an external plan
view, and Figure 4 a view of underside of improved valve showing the recess C,
for release of exhaust steam.
Figures 5 and 6 are respectively sectional plan and elevation of an engine
cylinder with my improved valve in position in the valve chest, bevel gear being
shown as the means of operating the valve.
Similar letters of reference are used to indicate like parts in the several views.
In constructing the valve according to my invention, the spindle d passes
through the steam chest cover, which is provided with a gland and stuffing box.
The disc has a segmental opening a cut through it for the admission of steam
or fluid and which comes into direct contact with port holes in suitable positions
on the cylinder valve face leading to the extreme ends of the cylinder. The
underside of the disc 6 is recessed or cut out as at c so as to provide a free outlet
for the escape of exhaust steam or fluid through the exhaust port h leading from
the centre of the cylinder valve face.
In Figures 5 and 6, g g¹ are the inlet ports to the cylinder and h is the exhaust
port.
The valve can be so constructed, by varying the length of the segmental open-
ing a, that the steam or fluid may be cut off at any part of the stroke of the
piston.
The rotating motion and reversing action of the valve is obtained by fixing
levers, rods, bevel or other gear to the end of spindle d, bevel gear being shown
in Figure 5 as above mentioned. I do not however claim as my invention any
form of driving gear nor any type of gearing for causing the rotative or reversing
motion of the valve.

page_text: Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed I declare that what
I claim is:
1. In a circular valve of gun or other metal the segmental opening a substan-
tially as herein described and shown.
2. In a circular valve of gun or other hard metal the recess c substantially as
herein described and shown.
3. The circular valve substantially as described and illustrated in Figures 1 to 6
of the drawings annexed.
JOHN P. O'DONNELL, Fel. Chart. Inst. P.A.,
Agent for said Applicant,
70 & 71, Palace Chambers, Westminster, S.W.