IMPROVEMENTS IN AND RELATING TO SLIDE VALVES FOR STEAM AND OTHER MOTIVE POWER ENGINES
Year: 1879

page_text: LETTERS PATENT to Joseph Hill, of Barrow in Furness, in the County of
Lancaster, also of 15, Water Street, Liverpool, in the County of Lancaster, for
the Invention of "IMPROVEMENTS IN AND RELATING TO SLIDE VALVES FOR
STEAM AND OTHER MOTIVE POWER ENGINES."
Sealed the 8th April 1879, and dated the 28th January 1879.
PROVISIONAL SPECIFICATION left by the said Joseph Hill at the Office of
the Commissioners of Patents on the 28th January 1879.
"
JOSEPH HILL, of Barrow in Furness, in the County of Lancaster, also of
15, Water Street, Liverpool, in the County of Lancaster. IMPROVEMENTS IN AND
RELATING TO SLIDE VALVES FOR STEAM AND OTHER MOTIVE POWER ENGINES."
My Invention has for its object certain improvements in and relating to slide
valves for steam and other motive power engines, by means of which improvements
I am enabled to dispense with the casing, cover, or box which ordinarily surrounds
and covers slide valves of steam and other motive power engines. By dispensing
with the casing, cover, or box of the slide valve considerable saving is effected by a
reduction of parts, stuffing boxes, and joints. The slide valve is open to view, and
any leakage or inaccuracy in the working thereof can be immediately detected.
.
In carrying out my Invention into practice I construct the cylinder valve faco
with the ordinary steam and exhaust ports, and my Invention consists in adding
to such cylinder valve face an additional port, which forms the steam supply port
to the slide valve, as hereinafter explained. This additional port is formed by
preference in a line with and at one side of the exhaust port, and may receive
steam from a branch on the cylinder connected with the steam pipe from the boiler,
the exhaust branch and pipe being on the other side of the cylinder.
In ordinary slide valves, known as the D type, the steam is admitted onto the
back of the valve, and finds its way over one or the other end, as the case may be,
of the slide valve, and thence into the top and bottom ports of the cylinder valve
face, such admission being allowed by the reciprocating movement of the valve,
the exhaust taking place through an internal recess formed in the valve, as is well
known.
My Invention in relation to the valve consists in prolonging the ends of the
valve so as always to cover the steam ports of the cylinder valve face, and forming

page_text: in such ends lateral recesses, being ports or passages corresponding with the steam
ports of the cylinder valve face, and in accordance with the stroke and require-
ments of the valve. These-recesses-or-ports-have an additional breadth given to
them on the side corresponding to the side on which is formed the steam supply
port on the cylinder valve face, and the recesses or ports in the valve are connected
together by a longitudinal-port or passage which covers the said steam supply.
port_on_the_cylinder valve face, the exhaust recess being formed-as-in-ordinary
ED-valves. It will thus_be_seen_that according to my Invention the steam supply
to the ports of the cylinder valve face is led under and through the valve instead
of over and round the valve. To keep the valve in its position I provide parallel
guides formed one on each side of the cylinder valve face, and to keep the valve up
to its seat or face I provide a bridge piece or pieces, or their equivalent, provided
with a pin or bar, or their equivalent, having an anti friction wheel, or roller, or its
equivalent, which presses on the back of the valve, the pressure being derived from
a lever actuated by a piston and rod in connection with a small cylinder on the
steam supply pipe, or the pressure may be produced by springs, or by screw power,
or otherwise.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Joseph Hill in the Great Seal Patent Office on the 25th July 1879.
JOSEPH HILL, of Barrow-in-Furness, in the County of Lancaster, also of
15, Water Street, Liverpool, in the County of Lancaster. "IMPROVEMENTS IN AND
RELATING TO SLIDE VALVES FOR STEAM AND OTHER MOTIVE POWER ENGINES."
My Invention has for its object certain improvements in and relating to slide
valves for steam and other motive power engines, by means of which improvements
I am enabled to dispense with the casing, cover, or-box-which ordinarily surrounds
and covers slide valves of steam and other motive power engines. By dispensing
with the casing, cover, or box of the slide valve considerable saving is effected by a
reduction of parts, stuffing boxes, and joints. The slide valve is open to view, and
any leakage or inaccuracy in the working thereof can be immediately detected.
In carrying out my Invention into practice I construct the cylinder valve face
with the ordinary steam and exhaust ports, and my Invention consists in adding
to such cylinder valve face an additional port, which forms the steam supply port
to the slide valve, as hereinafter described. This additional port is formed by
preference in a line with and at one side of the exhaust port, and may receive
steam from a branch on the cylinder connected with the steam pipe from the boiler,
the exhaust branch and pipe being on the other side of the cylinder.
In ordinary slide valves, known as the D type, the steam is admitted onto the
back of the valve, and finds its way over one or the other end, as the case may be,
of the slide valve, and thence into the top and bottom parts of the cylinder valve
face, such admission being allowed by the reciprocating movement of the valve,

page_text: Figure 8 is a section through E, E, Figure 1.
Figure 9 is a modification of Figure 5.
Upon reference it will be seen that A is the cylinder of a steam engine; B, the
cylinder valve face; C, the cylinder slide valve; E, cylinder slide valve guide;
F, slide valve spindle; H, piston rod.
My Invention in relation to the cylinder valve face consists in adding to such
cylinder valve face an additional port a which forms the steam supply port to the
slide valve, as hereinafter described (see Figure 4). The supply port a receives
steam through the branch b; e, e, are the ordinary steam ports of the cylinder valve
face; is the exhaust port, and g the exhaust outlet.
My Invention in relation to the slide vale consists in forming the ports of the
slide valve as shown at Figure 3. h, h, h, steam ports and passages; is the exhaust
port. It will be seen that the ends of the slide valve C are prolonged so as always
to cover the steam ports e of the cylinder valve face (see Figure 8). It will be scen
that in Figure 3 that the valve steam ports h, h, have an additional breadth given to
them on the side corresponding to the side on which is formed the steam supply
port a on the cylinder valve face, Figure 4. The ports h or recesses in the valve are
connected together by a longitudinal port or recess which covers the steam supply
port a on the cylinder valve face, Figure 4. The exhaust recess k in the valve C is
formed as in ordinary D valves. It.will thus be seen that according to my Inven-
tion the steam supply to the ports a of the cylinder valve face is led through the
ports or recesses h instead of over and round the valve as in ordinary cases.

page_text: To keep the valve C in its position; I provide parallel guides E formed one on
each side of the cylinder valve face B, and to keep the valve C up to its seat or face
-I-provide-the-anti-friction.roller L, the lever M, and steam piston and rod N. The
-pressure of the steam through the steam pipe O through the medium of the
-parts. L, M, N, keeps the valve C up to its cylinder face B. This may also be
Faccomplished, as shown in Figure:2, by the setscrews P, or, as shown in Figure 9, by
the bridge piece-and-screw-nuts-R
Upon reference to Figures 1 and 2 it will be seen that by a simple arrangement
of cocks and pipes a valve according to my Invention can be arranged to reverse-the-
engine without altering the eccentrics by merely changing the direction of the motive
fluid. To effect this I use two cocks Q, S, geared together by the rod T and worked
by the lever U. V is the steam supply; W, X, the exhausts. By this arrangement
I can supply the cylinder with steam, either through the passage b or through
the passage g, and use either for the exhaust; thus, the port a, Figure 4, can
be used as the steam supply, and f as the exhaust, or as the steam supply and
a as the exhaust. In like manner the port & in the valve C may be used for steam
or exhaust and h for steam or exhaust. Thus it will be seen that the engine can
be reversed without moving the eccentric or the slide valve with full pressure of
steam on. The engine can be reversed at its highest speed without damage and
with full steam on the valve.
In Figure 1 it will be seen that the same result can be arrived at by using a
fourway cock at V, V₁ being the steam and V₁ the exhaust. The four way cock
is worked by a lever or hand wheel, and indexed.
Having now fully described and ascertained the nature of my said Invention,
and shown how the same may be carried into practical effect, I would have it under-
stood that my Invention is not confined to the precise details and dimensions as
shown in the Drawings, nor is it confined to single engines, as it is applicable to
engines of two or more cylinders, but what I claim as my Invention and secured to
me by Letters Patent as aforesaid is,―
First. The construction and arrangement of a slide valve, such as C, and a cylinder
valve face, such as b, with ports and passages arranged in manner such as shown
in Figures 3, 4, 6, 7, 8 of the accompanying Drawings, and as hereinbefore
described.
Second. The construction of chestless slide valves, as illustrated in the accom-
panying Drawings, and working as hereinbefore described.
Third. The methods of reversing, the currents of motive fluid, and thereby the
action of the piston, by means of using either the steam or exhaust passages as the
supply and as the exhaust, in manner such as herein before described, and as illus-
trated at Figures 1, 14, 2, 3, and 4 of the accompanying Drawings.
In witness whereof, I, the said Joseph Hill, have hereunto set my hand
and seal, this Eighteenth day of July, in the year of our Lord One
thousand ciglit hundred and seventy nine.