Improvements in Valves.
Year: 1895

page_text: Date of Application, 24th Oct., 1895
Complete Specification Left, 24th July, 1896-Accepted, 24th Oct., 1896
PROVISIONAL SPECIFICATION.
Improvements in Valves.
1, JAMES DIXON CHURCHILL, of 37 Alexandra Road, Finsbury Park, in the
County of Middlesex, Engineer, do hereby declare the nature of this invention to
be as follows:-
In a valve according to this invention, suitable for use as a combined throttle
and stop valve, the throttle valve proper is of hollow cylindrical form arranged to
slide endways and control circumferential ports in a short cylindrical chamber that
is closed at one end and the other end of which serves as a seat for a stop valve
of mushroom or disc type, carried by ribs or wings on the throttle valve. The
stop valve is formed with a chamber or passage that is in communication with the
space at each side of the valve by openings controlled by a supplementary valve
located within the said chamber or passage and carried at the inner end of the
valve operating spindle. The arrangement is such that when this spindle is
operated in one direction to close or partly close the combined valves, the supple-
mentary valve at its inner end first closes the communication through its chamber
between the fluid spaces at the opposite sides of the stop valve, and then moves
the combined throttle and stop valves, the former of which is arranged to gradually
close the openings in the tubular chamber in which it works, before the stop valve
comes against its seat. When the spindle is moved in the opposite direction, the
supplementary valve is caused to establish communication through its chamber
between the fluid spaces at the opposite sides of the stop valve, which is thus by a
very small flow of fluid placed approximately in equilibrium aud therefore be
easily opened together with the throttle valve by the continued movement of the
spindle.
My invention will enable large valves to be easily and quickly opened and
closed.
In one arrangement, the tubular chamber is made separate from the valve case
within which it is secured by a flange so as to depend into the space on the outlet
or exhaust side of the combined throttle and stop valve, and the supplementary
valve is formed by an enlargement of the inner end of the valve spindle and
controls a central opening in the stop valve.
Combined throttle and stop valves constructed as described can be used for
various purposes, and may advantageously be used as compound attachment valves
in apparatus for governing steam engines such as marine engines as described in
the Specification of my Patent No. 6590 of 1890.
Deted this 24th dow of October 1895.

page_text: Improvements in Valves.
I, JAMES DIXON CHURCHILL, late of 37 Alexandra Road, Finsbury Park, in the
County of Middlesex, but now of 32 Portland Road, Finsbury Park, aforesaid,
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 :-
According to this invention a valve suitable for use as a combined throttle and
stop valve is constructed and arranged as represented in the accompanying
illustrative drawing, with the throttle valve proper of hollow cylindrical form
arranged to slide end ways and control circumferential ports in a short cylindrical
chamber that is closed at one end and the other end of which serves as a seat for
a stop valve of mushroom or disc type, carried by ribs or wings on the throttle
valve.
In the drawing the valve is shown in central vertical section. 1 is the valve
case having inlet and outlet branches 1* and 1' respectively, and cover 1°; it is
formed with an internal flange 1ª to which is secured by screws 2 a cylindrical or
tubular chamber 3. This chamber has a closed lower end and is formed with
ports 3ª communicating with the outlet 1. It is important that the chamber
should be so arranged that it is free to expand; it is therefore fitted loosely into
the case 1 and the screw holes through its flange are made somewhat larger than
the screws by which it is secured to the valve case. A pin or bolt 4 extends
through the bottom of the chamber 3 and into the valve case in such a manner as
to centre the chamber 3 in its proper position, whilst leaving it free to expand in
any direction.
5 is the hollow cylindrical throttle valve which coutrols the
ports 3ª; it is provided with upwardly extending ribs or wings 6 that connect it to
the stop valve 7, in which is formed a central opening or passage 7ª communicating
with the space at each side of the valve and is controlled by a supplementary
valve 8 connected by a universal joint to the inner end of the valve operating
spindle 9.
In the arrangement illustrated the valve 7 is provided with upwardly extending
portions 7 to which is secured a cross piece 7° having an aperture through which
the valve spindle 9 passes; the spindle is provided on the underside of the cross
picco with a collar adapted to engage therewith but capable of slight movement
relatively thereto before the supplementary valve 8 comes into contact with its
seat around the opening 7. 10 is an operating lever hinged upon the upper end of
the spindle 9 and linked to the valve case. The arrangement is such that when
the spindle 9 is operated in one dircction to close or partly close the combined
valves 5 and 7, the supplementary valve 8 first closes the opening 7 and then
moves the combined valves 5 and 7, the former of which is arranged to gradually
close the ports 3ª before the stop valve 7 comes against its seat on the upper edge
of the chamber 3. When the spindle 9 is moved in the opposite direction, the
supplementary valve 8 is caused to uncover the opening 7 through the stop valve,
which is thus, by a very small flow of fluid, placed approximately in equilibrium
and therefore can be easily opened, together with the throttle valve, by the
continued movement of the spindle. As will be understood valves constructed
according to my invention can be easily and quickly opened and closed and it may
sometimes, in order to render the uncovering of the ports 3ª somewhat gradual, be
desirable to slope their lower edges as shewn.
Combined throttle and stop valves constructed as described can be used for
various purposes, and may advantageously be used as compound attachment valves
in apparatus for governing steam engines such as inarine engines as described in

page_text: the Specification of my Patent No. 6590 of 1890. In cases where the supple-
mentary valve is not required, the valve 7 is made without the opening 7* but with
lugs, to which the lower end of the spindle 9 can be jointed after the manner
shown.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. My improved combined throttle and stop valve constructed arranged and
operating substantially as described with reference to the accompanying illustrative
drawings.
wherein
renoneen
ereinbefore described.
Dated this 24th day of July 1896.
For the Applicant,
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.