Improvements in Piston or the like Valves.
Year: 1897

page_text: Date of Application, 3rd May, 1897
Complete Specification Left, 21st Jan., 1898-Accepted, 12th Mar.
1898
t
· PROVISIONAL SPECIFICATION.
Improvements in Piston or the like Valves.
We, THOMAS JAMES BENNETT, of 160, Walton Street, Oxford, Dentist, and
WALTER FREDERICK THIOMAS, of 37, Bloomsbury Street, Birmingham, Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in what are generally termed piston
valves, or such that are circular or part circular in sectional shape.
and
The body of the valve is hollow, so that the explosive force such as in gas or
oil or spirit engines, or the steam in steam engines may find its way to the in-
terior of such valve. Around this body we provide an expansive split tube or
tubes, which consequently shall tend to expand itself tightly against the interior
wall of the valve chest or seating. Preferably we take a tube of a diameter
exactly fitting the interior of the valve chest or it may be a shade larger,
then cut a longitudinal slit along it, when it will expand itself a little, but which
when compressed can be made to readily enter the chest. This may now be se-
cured to the body of the valve by lying between collars or by having holes therein
fitting upon studs or projections upon the body or other convenient device, so that
as the said body is made to slide to and fro it shall carry the said tube with it.
Thus by these means at the time of explosion--in the case of gas, oil or spirit
engines or under pressure of steam or water &c. the tube is pressed close against
the face of the valve ports and leakage perfectly prevented.
Dated this 1st day of May 1897.
CHARLES T. POWELL,
Applicants' Agent.
Improvements in Piston or the like Valves.
We, THOMAS JAMES BENNETT, of 160, Walton Street, Oxford, Dentist, and
WALTER FREDERICK THOMAS, of 37, Bloomsbury Street, Birmingham, Engineer,
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:
This invention relates to improvements in what are generally termed piston
valves, or such that are circular or part circular in sectional shape.
The body of the valve is hollow, so that the explosive force such as in gas or
oil or spirit engines, or the steam in steam engines, may find its way to the in-
terior of such valve, in order to expand the broad ring with which it is provided
tightly against the valve casing.

page_text: '
In order to explain more clearly this our invention we have appended hereunto
illustrative drawings upon which are figures and numbers of reference, similar.
numbers referring throughout to the same thing or part.
Fig. is a part sectional view of this our invention.
Fig. 2 is a detailed end view of the split tubular ring valve.
Fig. 3 is a sectional longitudinal view of the valve (on line A-B Fig. 2).
Fig. 4 is a detailed view of the valve body or carrier.
Fig. 5 is an end view of the valve body.
Fig. 6 is a sectional view showing a modified shape of valve body.
Fig. 7 is a transverse sectional view of the modified shape of valve body (on
line CD Fig. 6).
+
10, is the valve, which is tubular in shape. Preferably we take a tube of a
diameter fitting the interior of the valve chest 11, or it may be a little larger-
and then cut a longitudinal slit 12, along it, when it will expand itself a little,
but which nevertheless by being compressed may be made to readily enter the
chest 11. The valve 10, is carried upon the body 13, having end collars 14, 14,
and shouldered parts 15, 15, so that as the said body 13,. is made to slide to and
fro it will carry the broad ring valve with it. The said collars 14, 14, on the
body 13, are provided with stops 22, 22, which fit into the recesses or notches 23, 23,
in the broad ring valve 10; and so prevent it rotating on the body 13. The body
of the valve 13, is also prevented by suitable means from rotating in the valve
chest 11, in order that the longitudinal slit 12, in the tubular valve 10, will
always be over one of the port bars 24, and thus prevent leakage.
It is also essential that the walls of the valve casing be thin and surrounded
by a water jacket in order to keep the valve ring cool.
Referring to Fig. 1, we have illustrated one form of valve casing merely in
order to explain this our invention as it will be readily seen. such casing may be
variously altered and adapted to suit any particular requirements, also the shape
of the valve body may be similarly varied as shown for instance in Figs. 6 & 7, in
which it will be seen that the two ends may be strengthened by the cylinder 16,
having openings 17, to permit of ready access of pressure to the interior of the
valve. Therefore to explain the action of our invention, 18 is the feed
passage which passes thence through the opening 19, and down the interior of
the valve to the combustion chamber 20. The valve is shown closed both to sup-
Fly and to exhaust, but it will be readily understood that if the valve was pushed
downwards past the opening 19, it would be open to feed, while on the other hand,
if raised until the bottom of the valve passed above the opening 25, it would then
be open to the exhaust passage 21. Thus at the time of explosion-in the case
of gas, oil, or spirit engines or under pressure of steam or water &c., when the
valve is closed (as shown) the valve is pressed close against the face of the valve
chest and leakage perfectly prevented.
The slit 12, may if preferred, be of an angular, curved, or other shape.
Having now particularly described and ascertained the nature of this our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
The combination with the hollow body 13, having end collars 14, 14, of the split
tubular ring valve 10, having access for the pressure to its interior surface, as
and for the purposes specified.
Dated this 18th day of January 1898
CHARLES T. POWELL,
Applicants' Agent, 12, Cherry Street, Birmingham.