An Improved Expansion Valve for Steam Engines.
Year: 1890

page_text: Date of Application, 10th May, 1890
Complete Specification Left, 10th Feb., 1891-Accepted, 4th Apr., 1891
PROVISIONAL SPECIFICATION.
An Improved Expansion Valve for Steam Engines.
GEORGE STONES and JOHN STONES, Atlas Works, Brook Street, Smethwick,
Staffordshire, Bolt & Nut Manufacturers, do hereby declare the nature of this
invention to be as follows :—
An improved expansion valve combined with and forming part of an ordinary
D slide valve, with cylinder, piston valve, and passages so formed that although the
two valves are made together, the movement of one has no effect upon the action of
the other and both valves can be worked as independant of each other as though
they were two separate valves.
In fitting expansion valves to the ordinary D slide valve, hitherto the expansion
valve has been made to move in the same direction as the D valve, and the move-
ment of one interferes with the action of the other, and therefore it has been
impossible to regulate the action of the expansion valve with that nicety which is so
essential to its proper working.
Now our improved expansion valve although being part of, and therefore moving
with the D valve, the movement of one has no effect upon the action of the other
and both valves can be worked and regulated entirely independant of each other as
though they were separate valves.
We will now proceed to describe our invention by referring to the accompanying
drawings.
Fig. 1 is a section of an end elevation of an ordinary D slide valve combined with
our improved expansion valve.
Fig. 2 being section of side elevation of same at line F, with ports to main steam
cylinder shewn below.
Now the novelty of our invention consists of a cylinder with piston valve so fixed
that the movement of one valve is at right angles with the movement of the other,
so that in a steam engine with main piston and slide valve working vertically, the
movement of our improved expansion valve would be horizontal-so that as shewn
in Fig. 2 the D valve would be moved from right to left, and visa versa, while the
expansion valve A. would be moved backward and forward.
The movement of the valve A being effected by a round rod with collars fitting
loose in the oblong hole B C this hole being long enough to allow the D valve to
move the full stroke without touching the rod.
It will be seen Fig. 1 that our improved expansion valve is made with two
distinct chambers D and E, so contrived that the one chamber has no connection
with the other. The expansion valve A is shewn covering the port to chamber E.
Assuming the steam chest (now shewn) to be filled with steam (boiler pressure) it
will be seen that the port into the passage D being open, the steam would pass
through it into the main cylinder through port G, and when sufficient steam has
passed into the main cylinder to maintain the speed required, the expansion valve A
would be instantly moved by our automatic gear, (Patent 1094388), or other suitable
means, to cover the port D, at the same time opening port E. The steam would
then fill the passage E ready for the opening of port H.
0.1 ML1800
GEORGE STONES.
JOHN STONES.

page_text: COMPLETE SPECIFICATION.
An Improved Expansion Valve for Steam Engines.
GEORGE STONES, JOHN STONES, Bolt & Nut Manufacturers, Brook Street,
Smethwick, Staffordshire, 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:-
An improved expansion valve, combined with and forming part of an ordinary
D valve with valve and passages so formed that although the two valves are made
together the movement of one has no effect upon the action of the other and both
valves can be worked as independent of each other as though they were two separate
valves.
In fitting expansion valves to the ordinary D slide valve hitherto the expansion
valve has been made to move in the same direction as the D valve and the move-
ment of one interferes with the action of the other, and therefore it has been
impossible to regulate the action of the expansion valve with that nicety which is so
essential to its proper working.
Now our improved expansion valve although being part of and therefore moving
with the D valve, the movement of one has no effect upon the action of the other,
and both can be worked and regulated entirely independent of each other just as
though they were separate valves.
This valve can be made with cylinder and piston valve as shewn on the drawing
or with plain valve and passages, the action of each being the same.
We will now proceed to describe our invention by referring to the drawings sent
with Provisional Specification.
Fig. 1 is a section of an end elevation of an ordinary D valve combined with our
improved expansion valve.
Fig. 2 being section of side elevation of same at line F with ports to main steam
cylinder shewn below.
Now the novelty of our invention consists of a valve so fixed that the movement
of one valve is at right angles with the movement of the other, so that in an engine
with main piston and slide valve working vertically the movement of our improved
expansion valve would be horizontal, so that as shown in Fig. 2 the D valve would
be moved from right to left and visa versa, while the expansion valve A would be
moved backward and forward.
It will be seen Fig. 1 that our improved expansion valve is made with two distinct
chambers D and E so contrived that the one chamber has no connection with the
other. The expansion valve A is shown covering the port to chamber E. Assuming,
the steam chest (not shown) to be filled with steam (boiler pressure) it will be seen
that the port into the passage D being open, the steam would pass through it into
the main cylinder through port G, and when sufficient steam has passed into the
main cylinder to maintain the speed required, the expansion valve A would be
instantly moved by our automatic gear (Patent 10,94388) or other suitable means to.
cover the port D, at the same time opening port E. The steam would then fill the
passage E ready for the opening of port H.
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 :-
:
An improved expansion valve combined with and forming part of an ordinary
D slide valve, with valve and passages so formed, that although the two valves are
made together, the movement of one has no effect upon the action of the other, and
both valves can be worked as independant of each other as though they were two
separate valves.