Improvements in Stop Valves.
Year: 1891

page_text: Date of Application, Eth June, 1891
Complete Specification Left, 7th Mar., 1892-Accepted, 9th Apr., 1892
PROVISIONAL SPECIFICATION.
Improvements in Stop Valves.
I, JAMES BROADFOOT, of 55 Finnieston Street, Glasgow, in the County of
Lanark, North Britain, Engineer, do hereby declare the nature of this invention to
be as follows, that is to say :--
My said invention which is applicable to stop valves for various purposes, has
for its object by an improved construction to obtain a valve which whilst extremely
close-fitting and tight in its closed position can be moved with very little friction
towards or from that position excepting when almost in it.
In carrying out the invention the seat against which the valve or closing detail
bears when closed is of a concave spherical form or of a cylindrical or other simple
form of the kind known as a surface of revolution.
When
The valve is a segment of a sphere (or other form having a surface of revolution)
corresponding to and fitting upon the seat when closed; and the valve is fixed to
and turned by means of a spindle fitted in bearings in the valve casing in a manner
to turn about an axis which is slightly eccentric to that of the valve seat.
the valve is moved away from its seat the eccentricity of the axis about which it
turns causes it to immediately leave the seat and become free from frictional
contact; and when being closed the valve has no rubbing contact with any part
until very nearly approaching its closing position.
The improved valve may be applied to pipes or passages for conveying any
fluid, such as water, steam, air, or gas; and in a modification very conveniently
applicable for general purposes I make the valve casing of a spherical or cubical
form with flanged openings on several sides or faces, to allow of its being connected
to pipes proceeding in various directions, any opening not used being closed by a
plate or blind flange.
For large pipes or passages such for example as ventilating pipes in the lower
parts of warships and other vessels, my improved valve is advantageously
applicable. The valve may be arranged to close by its own or an applied weight
or by a spring, being held open by a catch or detent arranged to be released by the
action of a float in the event of water passing along the pipes.
Dated this Sixth day of June 1891.
EDMUND HUNT,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Stop Valves.
I, JAMES BROADFOOT, of 55, Finnieston Street, Glasgow, in the County of
Lanark, North Britain, 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, that is to say :-
My said invention which is applicable to stop valves for various purposes, has
for its object by improved construction to obtain a valve which whilst extremely
close-fitting and tight in its closed position, can be moved with very little friction
towards or from that position excepting when almost in it.
In carrying out the invention the seat against which the valve or closing detail
bears when closed, is of a concave spherical form or of a cylindrical or other simple
form of the kind known as a surface of revolution. The valve or its bearing

page_text: surface is a segment of a sphere (or other form having a surface of revolution)
corresponding to and fitting upon the seat when closed; and the valve is fixed to
and turned by means of a spindle fitted in bearings in the valve casing in a manner
to turn about an axis which is slightly eccentric to that of the valve seat. When
the valve is moved away from its seat the eccentricity of the axis about which it
turns causes it to immediately leave the seat and become free from frictional
contact; and when being closed the valve has no rubbing contact with any part
until very nearly approaching its closing position.
The improved valve may be applied to pipes or passages for conveying any
fluid, such as water, steam, air, or gas; and in a modification very conveniently
applicable for general purposes I make the valve casing of a spherical or cubical
form with flanged openings on several sides or faces, to allow of its being con-
nected to pipes proceeding in various directions, any opening not used being
closed by a plate or blind flange.
On an accompanying sheet of explanatory drawings I show examples of my
valve as arranged for ventilating pipes in the lower parts of warships and other
vessels, for which purposes it is advantageously applicable; and the same examples
comprise appliances for automatically closing the valve in the event of water
passing along the pipes.
Figure, 1, of the drawings is a vertical section of the valve as applied between
two lengths of piping, A, B, which are in the same horizontal line.
Figure, 2, is a vertical section showing the valve applied at the angle between a
vertical pipe, A, and a horizontal pipe, 'B. The valve, C, is shown as open in
Figure, 1, and as closed in Figure, 2.
The same reference letters are used to mark the same or like parts in both
figures.
?
The pipes, A, and B, are fixed to flanged openings of a valve box, D, made
approximately spherical or cubical and with several flanged openings to any of
which pipes may be fixed, the openings not used being closed by plates such as, E.
The valve box, D, is made in halves for convenience in placing the internal parts.
The valve or closing piece, C, is in the form of a disk made with a spherical
bearing surface round its rim, which surface is shaped to fit upon an annular
spherical scat surface, F, formed in the valve box. In the modification shown in
Figure, 1, the valve, C, is, when being closed, turned towards the left hand through
a quarter of a circle from the position in which it is delineated. In the modifica-
tion shown in Figure, 2, the valve, C, is, when being opened, turned towards the
right hand through a quarter of a circle from the position in which it is delineated.
The valve, C, is inade with a pair of arms, G, (one of which is supposed cut away
in each section) and the outer sides of these arms have formed on them spindles, H,
shown by a dotted circle in each figure, and which have formed or fixed on them
eccentric, bosses, J., fitted to turn in bearings in the opposite sides of the valve box.
On one side the outer end of the bearing may be closed; at the other side, or at
cach side if preferred, the spindle, H, extends to the outside and has fixed on it a
lever, K, indicated by dotted lines, which lever may be acted on directly by hand
or through any convenient connections. For application where no automatic
closing action is required the parts so far described are sufficient.
In both figures, however, automatic closing devices are shown, these devices
comprising a float, L, contained in a well or vessel, M, adapted to the bottom of
the valve box, D, in a manner to receive water passing through the pipes, A, B.
The float, L, by means of a pin, N, having on it a roller acts on a slotted lever, P, 5
which is made with a short weighted arm, Q, and a detainer or catch consisting of
a small roller, R. When the valve, C, is opened a horn, S, on it pushes the
detainer, R, aside and gets to the other side of it. The lever, K, is weighted so
as to tend to close the valve, C, but is prevented from doing so by the detainer, R,
if however water gets into the pipes it raises the float, L, which acting on the 5
lever, P, moves the detainer, R, aside and allows the weighted lever, K, to close
the valve.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The improved construction of stop valve, with or without automatic closing
devices, substantially as hereinbefore described and as shown in the accompanying
drawings.
2. The arranging of the valve to move to and from its seat by a turning
motion about an eccentric axis, substantially as and for the purposes hereinbefore
described.
3. The combination with the valve of automatic closing devices substantially
such as are herein before described.
Dated this Fifth day of March 1892.
EDMUND HUNT,
Applicant's Agent.