Year: 1886

page_text: We, GEORGE HENRY DUTHIE (machinist) and WILLIAM WARREN BARCUS
(merchant) both of Muskegon, Michigan, United States of America, 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:-
Our invention relates to oscillating valves for steam engines, and the improve-
ments therein of such a nature that, first, it is perfectly balanced in its action;
second, supplies the steam to the cylinder so that its force upon the piston is
gradual from the beginning to the end of the stroke thereof; third, exhausts so
that a cushion is found in front of said piston, the reactionary force of which
greatly aids the return stroke; and fourth, when the valve becomes worn can be
snugly fitted or adjusted in its seat.
In the drawings
Figures 1, 3, and 4, are transverse vertical sections showing the valve of my
invention in different positions, and Figure 2 is a longitudinal vertical section of
the same.
D
Reference being had to the drawings and letters of reference marked thereon.
A represents the valve cylinder having lateral basal flanges by means of which it
is bolted to the piston cylinder. This cylinder has a cylindrical bore, and the
upper half of its shell is made hollow so as to form a chamber, a, into which the
fresh live steam enters through opening b. This chamber, a, is provided with
outlet apertures b, b, which open into the bore of the cylinder near the ends
thereof.
Fitting snugly within the core of the valve cylinder is the sleeve, B, which is of
a length corresponding to the distance between the outlet openings, b, b, and is
placed in position between said openings. The exterior of the sleeve is cylindrical,
but the bore tapers from a less to a greater diameter, as it approaches the actuating
devices of the valve: This sleeve is adjustable longitudinally by means of set-
screws B, B, passing through apertures in the heads of said valve cylinder, said
apertures being tapped and located with reference to the end edges of said sleeve.
C, represents the valve having its exterior circumference the obverse of the
inner circumference of the sleeve, B. ie., tapering; and having a longitudinal
sunken concave surface with a longitudinal central bridge, c, whose outer surface
TD 07

page_text: is on the peripheral line of said valve, which forms an exhaust chamber, D. This
exhaust chamber has two exhaust openings d, d, that is, an opening on either side
of said bridge as shown. In the shell of the valve C, on either side of said exhaust
chamber, D, a suitable and equal distance are the steam ports, e, e. Diametrically
opposite these steam port openings, e, e, are auxiliary ports f, f.
In the sleeve and cylinder, on a vertical line intersecting the center of the valve,
and of a width a little less than the bridge, c, is the exhaust port, E, and on either
side of the exhaust port about a distance corresponding to the width of the exhaust
opening d, are the steam passages, F. Opening into and leading from the valve
seat at points in the side of said valve seat, a distance from the steam ports
corresponding to that between steam port openings, f, and e,. are the auxiliary
steam passages, g, g, as shown in the drawings.
The valve is mounted on a suitable shaft, G, which has bearings, and is packed
in the ends or heads of the valve cylinder, and has a crank or arm secured to or
near its outer end through the medium of which it is oscillated. The valve itself,
is of a length corresponding to about that of the sleeve, B, viz: of a length
corresponding to the distance between steam openings, b, b, and is secured in such
position on the shaft as to come between said openings b, b, so that the steam
issuing from the latter can freely enter the open ends and circulate in the interior
of the valve.
The operation of our invention is substantially as follows:-
When the valve is in the position shown in Figure 1, the piston would be near
the right hand end of the piston cylinder. The exhaust in the first instance is
very slight; then as the valve assumes the position shown in Figure 3, it gradually
increases, and as gradually decreases as the position of the valve, shown in
Figure 4, is attained. It will be observed that because the initial exhaust is not
complete and open, a cushion is formed for the piston, the reactive expansity of
which will assist in the reverse stroke of said piston. When the valve reaches the
position shown in Figure 4, it reverses its motion, and substantially what has
been described as the action of the valve and its influence upon the piston as it
moves forward, takes place upon the opposite side of the piston as it reverses its
motion.
c
Bridge, c, greatly adds to the completeness of our invention, but it can be
dispensed with if desired. Again, instead of using: the steam chamber, a, with the
openings, b, b, the steam could enter said cylinder from the end.
The sleeve with the tapering interior and adjustable by means of set screws, can
be applied to a number of oscillating and rotary valves, but while we deem its use
preferable, yet, it could be dispensed with. It will be observed that the most
important feature of our invention is the valve itself. This valve C, has steam
ports e, e, and f, f. In the construction hereinbefore described, it has been
instanced that the ports f, f, were used in conjunction with the auxiliary steam
passages, g, g, and automatically opened the same. The fact is, these ports f, f, are
intended as much for the purpose of balancing ports e, e, as for the purpose just
stated. This being the case, and being an entirely new feature in the construction
of valves, it is immaterial, so far as this particular merit is concerned, whether the
auxiliary steam passages are in to the cylinder or not; therefore we wish to be
understood as claiming such valve and cylinder as well, without steam passages g, g,
in said cylinder, as with them.
Having now particularly described and ascertained the nature of our said
Invention, and in what manner the same is to be performed, we declare that what
we claim is :-
1st The combination in an oscillating valve with the cylinder A, having a
cylindrical bore, exhaust port, E, and steam passages, F, of sleeve, B, having its
core tapering and adjustable longitudinally, and valve, C, having steam ports, e, e,
and exhaust chamber. D.

page_text: 2nd The combination in an oscillating valve, with the cylinder, A, having a
cylindrical bore, exhaust port, E, and steam passages, F, and auxiliary passages g, g,
of sleeve, B, having its core tapering and adjustable longitudinally, and valve C,
having steam ports e, e, and f, f, and exhaust chamber D.
3rd The combination in an oscillating valve, with the cylinder A, having an
exhaust port, E, steam passages F, F, and auxiliary passages, g, g, of valve C, having
steam ports e, e, and f, f, and exhaust chamber D.
4th The combination in an oscillating valve, with the cylinder having a steam
chamber, a, supplied from a suitable source, outlet openings, b, b, exhaust port, E,
and steam passages, F, of a valve C, having steam ports, e, e, and steam exhaust
chamber, D.
5th The combination in an oscillating valve, with the cylinder, A, having a
steam_chamber, a, supplied from a suitable source, outlet openings b, b, exhaust
port, E, steam passages, F, and auxiliary steam passages, g, g, of a valve, C, having
steam ports, e, e, and f, f, and exhaust chamber, D.
6th The combination in an oscillating valve, with the cylinder having exhaust
port, E, and steam passages, F, of a valve, C, having steam ports, e, e, exhaust
chamber, D, and longitudinal central bridge, c.
7th In an oscillating steam valve the combination with a cylinder A, having an
exhaust port E, and steam passages, F, and g, of valve, C, having steam ports e, e,
and f, f, exhaust chamber, D, and longitudinal central bridge, c.
8th. In an oscillating steam valve the combination with a cylinder, A, having a
steam chamber a, supplied from suitable source outlet openings b, b, and exhaust
port, E, steam passages, g, g, of valve, C, having steam ports, e, e, and ƒ, ƒ, exhaust
chamber, D, and longitudinal central bridge c.
9th In an oscillating steam valve, the valve, C, having an exhaust chamber, D,
steam ports, e, e, and f, f, substantially as set forth.
10th In an oscillating steam valve, the valve C, having an exhaust chamber, D,
with a longitudinal central bridge therein, as described, and having steam ports, e, e,
and f, f, as and for the purpose set forth.
Dated this 27th day of July 1886:
HERBERT J. ALLISON,
Agent for the Applicants.