IMPROVEMENTS IN AND RELATING TO THE SLIDE VALVES OF STEAM ENGINES
Year: 1885

page_text: We HENRY HAWKSLEY TAYLOR and GEORGE HAWKSLEY TAYLOR, both of The
Times Works, Love Street Sheffield, in the County of York, Manufacturers, and
JOHN BATES N° 90 Allen Street, Sheffield aforesaid, Engineer do hereby declare
the nature of our said invention for IMPROVEMENTS IN AND RELATING TO THE
SLIDE VALVES OF STEAM ENGINES to be as follows:-
Our invention of improvements in Steam Valves has for its object to relieve the
valve from the pressure of the steam, so as to reduce the wear and tear of the valve
face and the seating, and to enable the starting gear to very easily operated. -
In carrying out our invention we make the valve with a back face of equal area
to that of the front face, and we prefer to make this back face to finish level with
the cover facing of the steam chest. Against the back face of the valve we place
a surfaced plate, so that the valve works between two faces, and the steam
acting upon each side of the valve with equal pressure it practically works in
equilibrium. The steam-chest cover is made deeper than usual for the following
purpose, to prevent steam passing to the back of the surfaced bearing plate before
mentioned, we use a thin metallic diaphragm extending over each edge of the
plate, which is firmly secured at its outer edge to the steam-chest cover, and in a
similar manner to the plate also. An opening is cut out of the centre of the
diaphragm for a projecting part of the bearing plate to pass through, and against
this projecting part, another plate is fitted and secured by bolts.
On the back of this last plate are a number of lugs (preferably four) made hollow
to contain short spiral springs which are acted upon by adjusting screws passing
from the outside through the cover, by this arrangement the pressure upon the.
valve may be adjusted.
ROBT F. DRURY,
Agent for the Applicants.

page_text: Improvements in and Relating to the Slide Valves of
-
Steam Engines.
We HENRY HAWKSLEY TAYLOR, and GEORGE HAWKSLEY TAYLOR, both of The
Times Works, Love Street Sheffield in the County of York Manufacturers, and
JOHN BATES No 90 Allen Street Sheffield aforesaid Engineer do hereby declare
the nature of our invention for IMPROVEMENTS IN AND RELATING TO THE SLIDE
.VALVES of STEAM ENGINES and in what manner the same is to be perforined,
to be particularly described and ascertained in and by the following statement,
that is to say :—
Our invention of improvements in Steam Valves has for its object to relieve the
valve from the pressure of the steam, so as to reduce the wear of the valve face
and the seating, and to enable the starting gear to be easily worked.
We annex a sheet of drawings of a valve made according to our invention, so
that our specification may be clearly understood, the same letters of reference
indicate the same parts in any of the figures in which they may occur.
Fig. 1, is a sectional elevation of valve.
Fig. 2, is a cross section of same.
Fig. 3, is a plan with top plate removed, and also with half the plate removed.
Fig. 4, is an end elevation of valve.
In carrying out our invention, we make the valve E with a back face (A) of
equal area to that of the front face (B) and we prefer to make this back face to
finish level with the cover facing C of the steain chest.
Against the said back face of the valve we place a surfaced plate D, so that the
valve works between two faces, and the steam acting upon each side of the valve E,
with equal force, the valve practically works in equilibrium.
The steam chest cover F is made deeper than usual for the following purpose;
to prevent steam passing to the back of the surfaced plate D, before mentioned, we
use a thin metallic diaphragm or frame G, extending beyond each edge of the
plate D, and firmly secured to the steam chest cover F, preferably by means of
screws as shown at H, it is also secured to the plate D, as shown at I.
Through an opening in the centre of the diaphragm G, a portion of the plate D,
is passed, and projects upwards into the cover F, and on the face of this projecting
portion, (d) a plate J, is secured by the screws K.
On the outerside of this plate J, there are a number of hollow lugs L, preferably
four, to contain suitable spiral springs, which are compressed by the adjusting
screws M passing through the plate N, and thus the pressure of the valve upon its
face may be regulated to the exact amount desired.
P is a small test pipe or indicator communicating with the working faces of the
valve E and the plate D; should any steam be drawn in or force its way between
the faces of E and D, it would at once escape into the atmosphere and thus the
equilibrium of the valve would be maintained.

page_text: Any excess of steam emitted from the pipe would indicate that a readjustment
of the screws M, was necessary.
The Pipe may also be used for lubricating the valve.
The thin metallic diaphragm G, is not only to form a steam tight joint between
the upper and lower parts of the steam chest, but also acts as an elastic medium,
through which the action of the compressing screws and springs may be transmitted
by the plate D to the valve E.
We wish it to be clearly understood that we do not allow steam to pass beyond
the face of the backplate D, neither is it the object of our invention, nor do we
utilise the elastic joint plate or diaphragm as the means of counterbalancing the
pressure of the steam on the valve, but merely to construct or form an elastic
steamtight joint between the plate D and the Cover F, so that the said plate may
respond to the action of the spiral springs acted upon by the adjusting screws.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, or carried into
effect, we declare that what we claim is
1 The improvement in Slide Valves for steam Engines, for the purpose
specified, substantially as herein before described and illustrated.
2nd In the construction of Slide Valves for Steam Engines, the combination of
the parts marked D, G, J, F, L M N and P, for the purpose specified, and substan-
tially as hereinbefore described and illustrated.
3rd In Slide Valves for steam Engines, having a backface at A working against
another face; the use of a test pipe P, communicating with or open to the said
backface, for the purpose specified.
4th In Slide Valves for Steam Engines, the use of a backplate D, fitting against
the valve E, and secured to the casing or cover by the diaphragm G, to be acted
upon by adjustable pressure springs, for the purpose specified, and substantially as
hereinbefore described and as illustrated.
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AL
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