Improvements in Stop Valves.
Year: 1896

page_text: Improvements in Stop Valves.
I, STEPHEN EVANS ALLEY, of Langside House, Langside, in the County of Renfrew,
North Britain, Engineer, do hereby declare the nature of this invention to be as
follows, that is to say. :-
My said invention has for its object to improve the construction of stop valves so as
to adapt them to satisfactorily control the passage of high-pressure steam through
pipes, the improved valves being also applicable for analogous purposes.
The improved valve is of a kind to allow a full unobstructed passage when open;
and comprises two disks provided with parallel annular bearing parts working on
parallel faces on seat rings fixed round the pipe passages where they communicate
with the part of the valve box in which the disks work. The valve disks are moved
by a spindle which extends through a stuffing box, and is screwed to be acted on by
a hand wheel fixed on an internally screwed centre engaging with the screw thread of
the spindle. The spindle acts on the disks by means of a head or collar on it, below
which it extends, with its diameter reduced so as also to act on a tubular piece which
is made with inclined surfaces to act like a wedge on counterpart inclines formed on
the inner sides of the valve disks. Within the tubular wedge piece there is a helical
spring which, resting on a screw nut on the lower end of the spindle, tends to bear
the tubular wedge piece upwards. The spring by its action on the wedge piece and
through it on the disks, tends to keep the bearing rings in contact with the seat rings,
whilst the disks are being moved towards or from the closed position, this action
cleaning the bearing surfaces and removing from them any substances which may
be on them. When, however, the disks approach the closed position the bottom
of the tubular wedge piece comes in contact with the bottom of the valve box, and
then the further depression of the spindle and disks causes the wedge piece to force
the disks firmly and rigidly against their seats.
Dated this Fourth day of June 1896.
EDMUND HUNT,
Applicant's Agent.
I, STEPHEN EVANS ALLEY, of Langside House, Langside, in the County of Renfrew,
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 has for its object to improve the construction of stop valves so
as to adapt them to satisfactorily control the passage of high-pressure steam through
pipes, the improved valves being also applicable for analogous purposes.
The improved apparatus comprises a spindle to which are attached two valve pieces
made with parallel faces, and moved against counterpart seat faces in a straight-way

page_text: valve box by the action of a wedge piece which on the closing of the valve encounters
the bottom of the valve box but which, when the valve is opened is moved with the
valve pieces out of the way:,
And in order that my said invention and the manner of performing the same may
be properly understood, I hereunto append a sheet of explanatory drawings, to be
hereinafter referred to, and showing three modifications of my improved stop valve,
in vertical section. On these drawings the same reference letters are used to mark
the same or like parts wherever they are repeated.
The improved valve is of a kind to allow a full unobstructed passage when open;
and according to the modification shown in Figure, 1, comprises two disks, A, provided
with parallel annular bearing parts, B, working on parallel faces on seat rings, C,
fixed round the pipe passages, D, where they communicate with the part of the valve
box, E, in which the disks work. The valve disks, A, are moved by a spindle, G,
which extends through a stuffing box (not shown) and is screwed to be acted on by a
hand-wheel (not shown) fixed on an internally screwed centre (not shown) engaging
with the screw thread of the spindle. The spindle, G, acts on the disks, A, by means
of a square or other suitable head or collar, J, on it, below which it extends with its
diameter reduced so as also to act on a tubular piece, K, which is made with inclined
surfaces to act like a wedge on counterpart inclines formed on the inner sides of the
valve disks, A. Within the tubular wedge piece, K, there is a helical spring, L,
which, resting on a screw nut, M, on the lower end of the spindle, G, tends to bear
the tubular wedge piece upwards. The spring, L, by its action on the wedge piece, K,
and through it on the disks, A, tends to keep the bearing rings, B, in contact with
the seat rings, C, whilst the disks are being moved towards or from the closed position,
this action cleaning the bearing surfaces and removing from them any substance
which may be on them. When, however, the disks, A, approach the closed position,
the bottom of the tubular wedge, K, comes in contact with the bottom of the valve
box, E, and then the further depression of the spindle, G, and disks, A, causes the
wedge piece to force the disks firmly and rigidly against their seats, C.
In the modification shown in Figure, 2, instead of a helical spring being employed
to act on the tubular wedge for the purpose of keeping the disks, A, against their
seats, C, two springs of which one, L, is shown are arranged, one at each side, to act
'directly on both disks so as to press them against the seats. When the disks, A, are
being moved to the open position the tubular wedge, K, may in this case rest on the
nut, M, on the lower part of the spindle, G. Öther parts of this modification not
described are similar to the corresponding parts of the modification first described.
In the modification shown in Figure, 3, the spindle, G, rotates but does not move
longitudinally and the disks, A, are moved towards and from the closed position by
the action of the spindle on a screwed centre piece, N, held between the upper parts
of the disks. Springs of which one, L, is shown are employed to keep the disks, A,
against their seats, C, in a manner similar to the corresponding springs of the modi-
fication shown in Figure, 2. The tubular space within the wedge, K, is in this case
made sufficient to clear the spindle, G, during the movement of the disks, A, to the
open position. During the movement of the disks, A, to the open position the tubular
wedge, K, may rest upon internal ribs, P, on the disks. Other parts of this modifi-
cation not described are similar to the corresponding parts of the modification first
described.
A valve box with internal parts like any of the modifications herein before described
may be placed in any desired position, that is with the spindle vertical, horizontal, or
inclined; and in some cases the part of the valve box into which the valve disks are
moved when opened may be at the opposite part to that having the stuffing box
through which the spindle passes.
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 :-
The combination of parts constituting the improved stop valve and comprising a

page_text: pair of valve disks closing on parallel seat rings with which they are kept in contact
by a spring or springs, a screw spindle arranged to move the valve disks, and a wedge
piece arranged on encountering the bottom of the valve box to force the valve disks
against the seat rings, whilst movable with the valve disks out of the way, substantially
as hereinbefore described.
Dated this Second day of March 1807