IMPROVEMENTS IN STRAIGHT-WAY STOP-VALVES
Year: 1884

page_text: I, HERBERT JOHN ALLISON, of 52 Chancery Lane, London, in the County of
Middlesex, Patent Agent; do hereby declare the nature, of my Invention for
"IMPROVEMENTS IN STRAIGHT-WAY STOP-VALVES," and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement :—
Figure 1, is a side elevation of my valve;
Figure 2, a longitudinal section of the valve-casing, valve-seat, and sleeve, the
valve and screw-stem being shown in elevation;
Figure 3, a transverse. section through the valve-casing and sleeve, at the
irregular line x on Fig. 2:
Figure 4, a horizontal section, at the line y, y, of Fig. 2: and,
Figure 5, a rear elevation of the sleeve for securing the valve-seat in place.
My Invention relates to improvements in that class of straight-way stop-valves
that are provided with valve-seats fixed in an inclined position in respect to the.
line of the flow of liquids through the device; and it consists in providing the said
class of valves with removable valve-seats which rest upon elastic cushions.
As represented in the accompanying Drawings A is the valve-casing when made
in the form of a vertical cylinder, with an inlet branch a, and outlet branch, a',
formed on opposite sides of it, so as to range in line with each other:
A transverse partition a², fixed in an inclined position-as shown in Fig. 2,―is
formed in said casing between the branches a and a¹; said partition contains a
circular opening a³-for the passage of fluids therethrough-and is provided, on its
upper face, with an annular tongue, at, which is concentric to the opening a³.
B, a removable valve-seat, provided with an opening b-which conforms to the
opening a³-and having, in its under face, an annular groove which fits over the
annular tongue a' of the partition a³; an elastic packing b¹, fitted into said annular
groove, forms a tight joint between the partition a² and valve-seat B, and also
serves as an elastic cushion for the latter.
C; a removable sleeve fitted to slide into the cylindrical body of the valve-
casing A, and having its lower end cut to an angle which conforms to the
inclination of the partition a², so that the said lower end may obtain a fair bearing
against the upper face of the valve-seat B for the purpose of securing the latter in
.

page_text: place. Through its longest side the sleeve C has an opening, c, which conforms to the
opening in the outlet branch a¹ of the valve-casing; and, transversely to the axial line
of the opening c, vertical grooves c¹, are formed oppositely, in the inner side of said
sleeve, for the purpose of guiding the valve D, and for preventing the latter from
being rotated by the action of the screw-stem by which it is operated. The upper
end of the sleeve C is finished to the same plane of the upper end of the cylindrical
body of the valve-casing A, and is adapted to receive a pressure from the bonnet E
of said casing.
.
•
The valve D has its face arranged at an angle to its line of motion, which angle
conforms to the angle of the valve-seat B, when the latter is fixed in place on the
partition a²; said valve is provided with wings, d, which engage in the guiding
grooves c¹ of the sleeve, for the purpose above set forth. By means of a screw-
cap, or other suitable means, the valve D is connected to the lower end of the
screw-stem F in such a manner that, while the said stem has perfect freedom to
rotate, it will have full control of said valve to properly effect the opening and
closing movements of the latter. The screw stem F is provided with a screw
threaded portion, which engages with a counterpart thread that is cut in the
upper part of the bonnet E, and the upper part of said stem passes out of the
bonnet through a stuffing box e, in the usual manner. A hand wheel G-or other
suitable appliance is attached to the outer end of the stem F, for the purpose of
rotating the latter to effect the opening and closing movements of the valve.
I preferably make these valves so that like parts for the same sizes will be
perfectly interchangeable; the parts being all finished to the standard sizes and
forms, the mode of assembling them into a complete device, is as follows:-The
seat B having the elastic packing 6' in its annular groove is placed upon the
annular tongue a of the valve casing A; then the sleeve C is inserted in the
cylindrical body of the valve-casing in such manner that the 'bevelled end of said.
sleeve will bear fairly upon the upper face of the valve-seat B; the valve D, is
fixed upon the stem F, and the latter is inserted to, or near, its greatest height in
the bonnet E; then the valve D is inserted in the sleeve C-each of the wings d
being placed in its appropriate groove c-and the bonnet E is screwed down, so as
to press down the sleeve C, to hold the valve-seat B securely in place; the hand-
wheel G is next secured to its place on the stem F, and the device is ready for use.
In case of any slight difference between the angle of the valve, and valve-seat-
which difference, when the. parts are properly made, would be inexcusable--the
elasticity of the packing b¹ will permit the valve-seat B to yield, and accomodate
itself to the face of the valve D when the valve stem F is screwed down sufficiently
hard.
The inner parts of. my valve are so perfectly accessible, that any of them can be
repaired and renewed, without removing the valve-casing from its place in the
pipes in which it is used:
.
Having now particularly described and ascertained the nature of my said
Invention; and:in what manner the same is to be performed, I declare that what
I claim.is
0
1. In a screw-valve, the combination with a valve-casing, and an inclined valve
operated by a vertically moving stem, of a removable valve-seat arranged in an
inclined position and supported by an annular tongue which prevents a lateral
movement of said seat, but permits a slight tilting movement thereof by reason of
an elastic packing, between said valve-seat and its support, thereby enabling the
valve-seat to accomodate itself to the face of the valve, substantially as specified..
2. In a screw-valve, the combination with a valve-casing provided with a valve-
seat arranged in an inclined position as herein described, and a removable sleeve
provided with oppositely arranged vertical guides, and having its lower end made
to conform to the angle of the valve-seat; of a valve adapted to be guided in said
removable sleeve, and having its face on an inclined plane that conforms to the
angle of the valve-scat; the line of motion of said valve being constantly in a
E

page_text: vertical direction, but inclined in respect to the plane of the valve-seat, substantially
as herein specified.
3. In a screw-valve, the combination with a valve-casing A containing a
transverse partition, a², arranged in an inclined position as herein described, a
valve-seat, B, rėmovably attached to the inclined partition a³, and a removable
sleeve C, provided with guiding grooves c¹, and adapted to secure the valve-seat B
in place, as herein set forth, of the valve D, having its face set to conform to the
angle of the valve-seat B, and having wings, d, that are adapted to engage in the
guiding grooves c¹, as and for the purpose herein specified.