Year: 1897

page_text: Date of Application, 2nd Apr., 1897-Accepted, 19th June, 1897
We, JOHN MUIR and EDWARD ANDREWS MORSE, both of 164 Dearborn Street,
in the City of Chicago, County of Cook, State of Illinois, United States of America,
Gentlemen, and FREDERICK OSCAR PIERSON, of Oskosh, in the County of Winnebago
and State of Wisconsin, United Statos of Ainerica, 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 :-
Our invention relates to that class of valves which are intended to be interposed
between two receptacles, one of which contains a high and variable pressure, and the
other of which is desire to contain a constant and oven, pressure lower than that in
the first vessel. The object of the invention is to make the valve as nearly independent
of the higher pressure as is possible, and to construct it in such a manner that it shall
be strong, positive, and easy working. To such end the invention consists in certain
novel features of construction which will be hereinafter fully described.
The invention is illustrated in the drawings by means of two figures, of which,
Figure is a vortical diametrical section of the valve, and Figure 9 is a horizontal
section looking downward from line 2-2, of Figure 1.
In these figures A is a pipe leading from the vessel which contains the
higher and variable pressure, and B is a pipe leading to the vessel in which it is
desired to preserve an even and constant pressure. Both of these pipes are coupled
to a valve casing C, the pipe, B, opening directly into the valve chamber, c, and the
pipe, A, opening into the same through the valve port, c'. In the lower portion of
said port is provided a seat, c, bevelled downwardly and outwardly and a tapered
valve, D, is fitted to said seat and is carried by a triangular stem, d, extending upward
through the port, e, and the valve chamber, c. The valve casing, C, has secured to
its upper portion an extension, c³, and a diaphragm, E, of suitable material, preferably
of German silver, is held tightly between the casing and the extension. The
diaphragm is secured to the valve stem by a shoulder, d', and a washer, F, and is
clamped between the two by means of a nut, G, upon said stem.
Above the washer and within the cylindrical extension, c', is a coiled spring, H,
pressing down upon the washer and held down at the top by means of a disc, I,
threaded in the interior of the cylindrical extension and provided with an upwardly
extending boss, i, upon the valve stem, by means of which it may be screwed down
or np. A cap, J, rests upon the top of the cylindrical extension and above the same
a nut, K, provided with a band-wheel, k, is threaded to the stem.
This nut, K, is used to screw the valve to its seat and to limit the extent to which
the same may open.
The pressure within the pipe, B, which is to be limited to a predetermined maximum
is sustained by the under side of the diaphragm, E, and is balancod by the pressure
of the spring, H, bearing down upon the top thoroof. The tension of the spring is
adjusted by means of the disc, I, to vary the pressure upon the diaphragm ns may be
desired. The under face of the washer, F, is convox downwardly to relieve the
diaphragm of the great strain which would be caused if the same were flat.
To adjust the valve the high pressure is turned down in the pipe, A, and the nut, K,
oosened up sufficiently to allow the valve to drop away from its seat and permit the
gas or liquid under the pressure to pass through the valve and into the pipe, B. As
soon as the pressure rises in the latter and exerts itself upon the diaphragm the valve
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page_text: will be closed and the flow will be checked. If now the pressure obtained is too slight
the nut, K, and cap, J, are removed and the disc, I, screwed down a trifle until the
valve again opens. The passage of the fluid recommences and continues until the
pressure within the valve chamber again overcomes the spring, H, and closes
the valve. This operation is continued until the desired pressure is obtained after
which the valve becomes automatic and will open upon a reduction of the pressure in
the valve chamber and remain open until such pressure rises to the predetermined
limit. The under surface of the valve is so small compared with that of the diaphragm
that the pressure of the fluid thereon can be disregarded and the opening and closing
of the valve will be performed entirely by the variations in the pressure above the
same.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. The combination with a suitable valve casing of an outwardly opening valve, a
valve stem connected with and operating the valve and extending within the casing,
a diaphragm spanning the chamber within the casing, and secured to the valve stem
and a spring arranged to press the diaphragm toward the valve and tending to open
the latter, the diaphragm being of comparatively much greater area than the valve
whereby the pressure within the valve chamber may be governed by the tension of
the spring without regard to that upon the outside of the valve; substantially as
described.
2. A limiting valve comprising a valve casing containing a valve chamber, an
outwardly opening valve, a valve stem extending from the valve into the chamber a
diaphragm spanning the chamber and secured to the valve stem, a spring pressing
upon the diaphragm upon the side opposite from the valve chamber, and means for
adjusting said spring; substantially as described.
3. A limiting valve comprising a valve casing, an outwardly opening valvo, a valve
stem extending within the casing, a diaphragm spanning the chamber within the casing
and secured to the valve stem by means of a shoulder within the chamber, and a nut
and washer upon the opposite side of the diaphragm, convex upon the side adjacent
thereto, a spring bearing upon the top of the washer and an adjustablo device for
bearing down upon the spring and varying the pressure, the area of the valve being
so small as compared with that of the diaphragm as to prevent the pressure upon said
valve from interfering with the action of the spring and diaphragm; substantially as
described.
4. The combination with the valve casing, C, having a bevelled valve seat of the
outwardly opening valve, D, fitted to said seat, the inwardly projecting stem, c',
adapted to operate said valve, the diaphragm E, spanning the interior of the casing
and secured about its margin to said casing by means of an extension, c, the
shoulder, d', washer, F, and nut, G, securing the diaphragm to the valve stem, the
coiled spring, H, pressing down upon the washer, the screw-threaded disk, I, threaded
within the extension, &, the cap, J, and nut, K, threaded to the valve stem above the
cap; substantially as described.
Dated thin: 1007