IMPROVEMENTS IN COMBINED CHECK AND STOP- VALVES
Year: 1884

page_text: COMPLEIE
SPECIFICATION.
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I, HERBERT JOHN ALLISON, of 52 Chancery Lane, London, in the County of
Middlesex, Patent Agent, do solemnly, and sincerely declare that I am in
possession of an 'Invention for "IMPROVEMENTS IN COMBINED CHECK AND STOP-
VALVES;" and I do hereby declare the nature of my Invention for "IMPROVEMENTS
IN COMBINED CHECK AND STOP-VALVES," and in what manner the same is to be,
performed, to be particularly described and ascertained, in and by the following
statement:-
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Figure 1, is a longitudinal section of a valve containing my improvements, the
screw-stem being shown in elevation.
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Figure 2, a transverse section through the centre line of the same, the valve and
parts of the screw-stem and bonnet being shown'in elevation'; and
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Figures 3 and 4, longitudinal sections of two modifications of my Invention.
My Invention consists of a novel construction of the valve-casing, 'and the
arrangement of the valves, one above the other; and it also consists in providing
said valve-casing with valve-seats that are both renewable and interchangeable; as
hereinafter. set forth. The object of my Invention is to combine in one device, a
check and stop-valve, and by providing the casing with renewable valve-seats; to
avoid the necessity. of removing the valve-casing from a line of pipe when by use,
or other cause, the valve-seats become impaired.
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As represented in the Drawing A is the valve-casing made in globe form, and
provided with induction-nozzle a, eduction-nozzle a, upper branch 2, and lower
branch a³; said valve-casing contains, as an integral part of it, an inner cylindrical
valve-chamber B, which is joined to said casing by its upper end, as at b, at the.
induction side, and by its lower end, as at 6, at the eduction side; an inclined
partition C-formed between the casing A, and the exterior wall of the
chamber B-also connects the two parts, and produces a perfect separation of the
induction from the eduction opening, excepting a passage through the chamber B,
obtained by reason of the opening b², formed by, the lower annular flange b³-and
opening bformed by the upper annular flange 65. As shown in Figs. 1, 2 and 4,
the valve-casing A is provided with renewable valve-seats D, that are detachable
from said casing; each of said valve-seats is composed of a flat annular metallic
[Prine 627

page_text: flange, having a short cylindrical flanged, on one of its flat surfaces, the inner
diameter of said cylindrical flange, forming a continuation of the opening through
the valve-seat. As shown in Fig. 3, the removable seats are dispensed with, the
flange 6, of the inner chamber B, forming the upper valve-seat, and an annulus D¹-
screwed, into the chamber B beneath the flange b³-forming the lower valve-seat.
E, the lower valve, which-in all the different constructions shown-serves as a
check-valve, and is of a well known form of puppet; said lower valve is provided
with ears, e, which strike against the under side of the flange 66 and limit the lift of
the valve.
F, the upper valve, which, in the first three Figures of the Drawing, is attached-
by means of a revoluble joint—to the lower end of the screw-stem f, and forms the
stop-valve of the device; but as shown in Fig. 4, the valve F is separated from the
screw-stem f, so as to adapt it to act either as a supplementary check-valve, or as
a stop-valve, and for this purpose the valve F is provided with a stem f¹ which,
when acting as a check-valve, is guided by an opening formed in the lower end of
the screw-stem f; the latter being so arranged that it can be screwed down to
confine the valve F to its seat while in use as a stop-valve.
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G, a cap or bonnet fitted to screw into the upper branch as, of the valve-casing;
said cap is provided with the usual stuffing-box, g, for the screw-stem f, and has an
internally screw-threaded portion, g', that serves as a nut for said screw-stem.
shown in Figs. 1, 2, and 4, the lower part of the cap G has the form of, a sleeve,
which contains openings, g³, that communicate with the eduction opening of the
casing A; said openings are separated by bars, g³, that connect with an annular
flange, g, which forms-an integral part of the cap G, and which bears upon the
upper elastic packing H, for the double purpose of forming a tight joint at that
point, and securing the upper valve-seat D in place. As shown in Fig. 3, the lower
end of the cap G terminates in the usual screwed portion for securing it to the
casing A. I, the cap for the lower branch of the casing A: it is provided with a
guide, i, by means of which the lower valve is guided; and, as shown in Fig. 1, 2,
and 4, the upper part of said cap has the form of a sleeve which contains
openings, , that communicate with the induction opening of the valve-casing; the
bars separate said openings, and connect with the annular flange is which bears
against the lower elastic packing H and performs the same duty as hereinbefore
described in respect to the flange g₁ of the upper cap.
In the modification shown in Fig. 3, the parts 2, 3 and i³ are dispensed with..
It will be seen that the upper and lower valve-seats D are formed exactly alike,
but are placed in reversed positions, so that the valves E and F have their bearings
upon opposite sides of their respective valve-seats; by this arrangement-when
the valve-seats become worn, or cut, on one face-the two seats may be inter-
changed, so as to present new bearings for the valves to seat on, until the seats D, or
either of them, become too worn for further use, when new ones can be inserted at
a. very slight cost.
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
1. In a combined check and stop-valve, the combination, with a valvo-casing,
containing an inner valve-chamber, and a partition-formed between said casing
and the wall of its inner valve-chamber-for separating the induction and
eduction openings of said casing; the said inner valve-chamber being provided
with two valve-seats arranged one above the other, as herein described, of two
independent valves, entirely disconnected from each, other, and arranged as herein
set forth; the lower of said valves being always free to operate as a check-valve,
and the upper one being provided with means whereby it can be forcibly retained
upon its valve-seat, as and for the purpose herein specified.
2. The combination, with a valve-casing A containing an inner valve-chamber B
and a partition C, formed as herein described, of the removable valve-seats D, and

page_text: caps G and I, constructed substantially as described, and adapted to secure the
valve-seats D as herein specified,
3. The combination, with a valve-casing A, adapted to contain two independent
valves, arranged one above the other, substantially as herein described, of the
removable and interchangeable valve-seats D, cach consisting of a flat annular
flange provided with a cylindrical flange d, as and for the purpose specified.
Dated this 6th day of May 1884.
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HERBERT J. ALLISON.