Improvements in and connected with the Slide-valves of Steam and other Engines.
Year: 1891

page_text: Date of Application, 26th Feb., 1391
Complete Specification Left, 24th Nov., 1891-Accepted, 24th Dec., 1891
PROVISIONAL SPECIFICATION.
Improvements in and connected with the Slide-valves of Steam and
other Engines.
We, ELISHA LOVEDAY, HERBERT ELISHA LOVEDAY, and ARTHUR JOHN
LOVEDAY, all of Old Buckenham, in the County of Norfolk, Engineers, do
hereby declare the nature of this invention to be as follows:-
-
Our invention relates to the slide-valves of steam and other engines, and has for
its object to provide means for taking up or compensating for any wear upon the
slide-valve or its face due to the pressure upon the valve.
According to our invention the slide-valve is provided with two faces, one of
which bears against the surface of the cylinder whilst the other has in contact with
it an adjustable plate adapted to be adjusted more or less by means of suitable
screws.
This plate is provided with a rearward extension which passes through a stuffing-
box and gland in order to prevent the escape of steam or other motive fluid around
the said plate.
In the said adjustable plate are formed hollows or recesses corresponding to the
several ports of the cylinder and in the valve are five ports, two of which, at each
end of the said slide-valve, serve to distribute the motive fluid whilst the fifth and
central port serves for the exhaust.
The said valve is advantageously operated by a rod passing through both ends
of the steam chest.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in and connected with the Slide-valves of Steam and
other Engines.
We, ELISHA LOVEDAY, HERBERT ELISHA LOVEDAY, and ARTHUR JOHN
LOVEDAY, all of Old Buckenham, in the County of Norfolk, Engineers, 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 the slide-valves of steam and other engines, and has for
its object to equilibrate such valves and thereby obviate undue wear of the valves
and of the faces upon which they work.
According to our invention the slide-valve is provided with two faces, one of
which bears against the surface of the cylinder whilst the other has in contact with
it a plate adapted to be adjusted more or less by means of suitable screws.
This plate is provided with a rearward extension which passes through the valve-
chest, a stuffing-box and gland being used in order to prevent the escape of steam
or other motive fluid around the said plate.
In the said adjustable plate are formed hollows or recesses corresponding to the
several ports of the cylinder and in the valve are five ports, two of which, viz. one
at each end of the said slide-valve, serve to distribute the motive fluid whilst the
fifth and central port serves for the exhaust.

page_text: The said valve is advantageously operated by a rod passing through both ends
of the valve-chest.
To enable our invention to be fully understood we will describe the same by
reference to the accompanying drawing, in which :--
Figure 1 is a section through the valve-chest of a steam cylinder having a slide-
valve therein arranged in accordance with our invention:
Figure 2 is a section on the line, Figure 1:
Figure 3 is a plan; and,
Figures 4 and 5 are views of details hereinafter described.
a indicates the slide-valve which is shewn detached in Figure 4 and which is
operated through the medium of a rod passing through both ends of the valve-
chest is the face of the cylinder against which the said valve works and in
which are formed the ports for the admission of the motive fluid into and from the
cylinder, and d is the adjustable plate which bears upon one side of the slide-valve.
The said plate d is shewn detached at Figure 5 and has in it recesses e, e, e¹ corre-
sponding to the ports of the cylinder, the said recesses serving to afford as much
exposed area on one side of the valve a as the ports themselves afford upon the
other side of the valve, so as to equalize the pressure upon both sides thereof.
The plate d has passages, tlierethrough for admitting the motive fluid to both
ends of the valve-chest and for enabling the said plate to be uniformly heated.
is the gland which serves to prevent the escape of steam around the adjustable
plate d, the said gland being preferably in the form of a flanged plate so as to cover
the said adjustable plate d. h, are the screws by means of which the plate d is
adjusted relatively to the slide-valve a. These screws at their lower ends bear
upon the plate d and pass through screw-threaded holes in a plate i, fixed by means
of standards j, j upon the cover of the valve-chest in such a manner that, when the
said screws are slightly rotated, they will move the plate d towards the slide-valve.
As shewn, each screw has attached to it a lever k, the free ends of the said two
levers being connected by a screw passing through a lug m upon the plate i in
such a manner that the said levers can be moved simultaneously. n, nare nuts
arranged on the screw upon opposite sides of the lug m and serving to lock the
levers k, and consequently also the screws h, h in any position in which they may
be adjusted.
o, o are screw-threaded studs which pass through the plate of the gland g and
also through the plate, the said studs having at their upper ends nuts; these
studs and nuts serve to ensure the immovability of the plate d after it has been
adjusted by means of the screws h, the said nuts must be loosened before the
said plate d is adjusted.
P. P. p, p, p² are the five ports formed in the slide-valve a, the ports p, p and p²
operate in the ordinary manner in conjunction with the cylinder ports.
The
ports p', p serve to establish communication between the ports of the cylinder and the
recesses e, e in the plate d so that, after the supply of motive fluid has been cut off,
the motive fluid in the cylinder will bear with equal pressure upon both sides of the
valve notwithstanding any variations therein owing to expansion..
4, are openings formed in the ends of the slide-valve in order to admit steam
to the ports p, p from the valve-chest.
is a spring-valve placed in one of the walls of the steam-chest and adapted to
open automatically under the action of the atmospheric pressure to prevent the
formation of a vacuum within the steam-chest.
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. The improvements in the slide-valves of steam and other engines consisting in
arranging the same to slide between two faces, one of which is adjustable and has
formed in it recesses, the area of which corresponds with the area of the ports in the

page_text: other face; the said slide-valve being also provided with passages for establishing
communication between the ports and the said recesses, substantially as, and for
the purpose, described.
2. The combination with a slide-valve working between two faces, one of which
is adjustable, of mechanism for adjusting the said plate, substantially as described.
3. The improvements connected with the slide-valves of steam engines, sub-
stantially as herein before described and illustrated in the accompanying drawing.
Dated the 24th day of November 1891.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.