Improvements in Stop Valves.
Year: 1889

page_text: Date of Application, 13th May, 1889
Complete Specification Left, 13th Feb., 1890-Accepted, 5th Apr.. 1890
PROVISIONAL SPECIFICATION..
Improvements in Stop Valves.
I, JOHN STURGEON, of No. 6 Lincoln's Inn, Corporation Street, Birmingham,.in
the County of Warwick, Civil Engineer do hereby declare the nature of this
invention to be as follows:-
My invention is for " Improvements in Stop Valves ;"-and the object is to
produce a stop valve.which shall present a continuous unbroken passage equal to the
bore of the pipe, to be easily moveable, and always held tight by the pressure in
the pipe irrespective of any wear of.the rubbing surfaces.
The valve consists of a main plug fitting loosely in the cylindrical valve casing,
and having a secondary plug fitted loosely within it, at right angles to its axis, with
its ends faced to fit the casing,in which the main plug works, and made large enough
to cover the opening to the pipe. A passage way equal to the bore of the pipe is
When
formed through both main and secondary plugs, at right angles to the latter.
the valve is closed the pressure behind the secondary plug presses it tight up against
the opposite face, thus always following up the wear of the rubbing surfaces. With
a quarter turn the passage way through the two plugs is brought opposite the pipe
way, and the valve is full open.
3000
COMPLETE SPECIFICATION.
Improvements in Stop Valves.
I,,JOHN STURGEON,. of No. 6, Lincoln's Inn, Corporation Street, Birmingham, in
the County of Warwick, Civil 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 :—
My Invention is for Improvements in Stop Valves and the object is to produce a
Stop valve which shall present a continuous unbroken passage equal to the hore of
the pipe, easily movable, and always held tight by the pressure in the pipe,
irrespective of any wear of the rubbing faces.
The valve consists of a main plug or carrier, fitting loosely, that is, easily, in a
cylindrical casing, and having a secondary plug, which acts as the stop or closing
medium, fitted, loosely within it at right angles to its axis. The ends of the secondary
plug.are faced to fit the casing in which the main plug works, and they are made
large enough to cover and close the opening to the passage way or pipe of the
casing. A passage way equal to the bore of the passage way or pipe of the casing
is formed through both the main and the secondary plug, at right angles to the
axis of the latter. When the valve is closed, the pressure behind the secondary plug
presses it tight up against the opposite face of the casing, so as to cover and stop the
passage way thereof.
By the above arrangement, the secondary plug always follows up the wear of the
rubbing surfaces. With a quarter turn the passage way through the two plugs is
brought opposite the passage or pipe way of the casing and the valve is full open.
The following is a full clear and exact description of my invention, reference
being had to the annexed sheet of drawings which show an example of a plug stop
valve with improvements according to my Invention applied thereto, and make a
part of this Specification, and are marked with letters and figures of reference
corresponding to those used in the following explanation thereof; like letters and
figures being used to denote like parts throughout the drawings.

page_text: DESCRIPTION OF THE DRAWINGS.
Figure 1 is a side sectional elevation, illustrating an example of a stop valve
provided with improvements according to my Invention.
Figure 2 is. an end sectional elevation of the stop valve shown at Figure 1.
Figure 3 is a sectional plan of the stop valve, taken at X X Figure 1.
Figure 4 is a plan of the valve.
The following letters of reference are used to designate the parts of the stop valve
shown in the drawings. a is a main plug fitting loosely in a cylindrical valve
casing having a faced bore. d is a secondary plug which acts as the stop or closing
mechanism, fitting loosely within the plug a and at right angles to its axis, and
having its ends did faced to fit the casing bin which the plug a works, and of size
(diameter) to cover and overlap tlio passage openings e h of the valve. i is a
passage way equal to the bore of the openings eh, and formed through both plugs a
and d, and at right angles to the axis of the latter. is a groove formed on the
inside upper surface of the plug a, and at right angles to its axis. I are studs fixed
on the outside of the plug d and fitting in the groove k of the plug a, their
use being to prevent the plug d turning in the plug a. m is the cover of the valve
and n is the stuffing box and gland; is the spindle formed on the plug a, by
which the valve is turned (opened and closed).
The action of the valve is as follows;-when the valve is closed, the faced
ends of the plug d cover the openings e h of the casing b, and the pressure of
the fluid acting behind, at the one end of the plug d, forces the plug d with its
opposite end tight up against the face of the opposite opening, thus always following
up the wear of the rubbing surfaces. To open the valve, a quarter turn is given to
the plug a, and the plugs a and d are brought into the position shown in the drawings,
and the valve is full open.
a
In the beforegoing description I have set forth and described a convenient
arrangement and construction of a stop valve with the improvements according to
my invention, comprising a main plug or carrier, and a secondary plug being
stop or closing mechanism which is kept on or up to its seat by the pressure of
the fluid which is shut off or controlled. I would however have it understood that I do
not consider that my Invention is confined to the precise and particular construction
of stop valve and parts shewn and described, as it may be modified to suit valves
differing in construction to the one more particularly described.
Having now particularly described and ascertained the nature of my said Invention
and in what manner the same is to be performed 1 declare that what I claim is :-
1. A stop valve in which the passage way is closed and kept tight by the pressure
of the fluid or gas under control acting upon a movable or loose valve, stop piece, or
plug, and forcing it against a seat round the opening to be closed, substantially as
set forth.
2. A stop valve having a main or operating plug or carrier, fitting loosely in
the casing of said valve, and a secondary plug or stop piece fitted in such main
plug, or carrier, and free to move therein, said secondary plug being provided
with faced parts adapted to cover and close the opening or openings or passage
way of the valve, and adapted to be kept up to its seat by the pressure of the fluid
under control.
3. A stop valve constructed and operating substantially in the manner described,
and also the parts of a stop valve arranged and adapted to operate as set forth with
reference to the drawings.
4. The construction of valve substantially as described, by which a continuous
unbroken passage, even with the bore of the pipe or passages thereof, is provided.
Dated this 12th day of February 1890
CHEESBROUGH & ROYSTON,
15, Water Street, Liverpool, Agents for the Applicant.