Stop-valve for Containers of High Pressure and Liquefied Gases.
Year: 1896

page_text: Date of Application, 26th May 1896-Accepted, 8th Aug., 1896
COMPLETE SPECIFICATION.
Stop-valve for Containers of High Pressure and Liquefied Gases.
I, OSCAR BRÜNLER of Kültzschau, Eilenburg, near Leipzig, Germany,
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:-
The stop valves for the containers of high pressure and liquefied gases, for
instance transport cylinders for liquid carbonic acid, are without exception
defective; the defect being that a part of the gas escapes through the stuffing-box
and is lost.
It occurs in transporting a long distance, that the containers are subject to such
shaking that the valve loosens from its seat, in consequence of which the valve is no
longer firmly closed. Now it is seldom that the packing of the stuffing-box is
sufficiently tight in order to afford sufficient resistance against the great pressure
of the gas for long duration. In the course of time a part escapes and sometimes
the whole contents of the container. This disadvantage presents itself also during
use, but in a still greater degree. It has become customary to insert an apparatus
for diminishing the pressure between the stop valve and the place of applica-
tion. This apparatus is only of use if the stop valve can remain open
The apparatus for diminishing pressure automatically effects the opening and
closing. In the case of the valve remaining open during the whole time, the
tightness of the packing of the stuffing-box has exclusively to be depended upon.
But experience has shewn that even the best packing material imperfectly fulfils
the purpose. This disadvantage is remedied by the present invention. In the
accompanying drawing a stop valve in two different forms of construction is shewn,
by which such loss of gas is prevented.
Fig. 1 is the longitudinal section of the one form.
Fig. 2 the longitudinal section of the second form.
The same letters denote the same parts in both drawings.
a is the valve-case, tightly screwed into the container. b is a valve, movably
arranged, which is shewn in the drawing as closed (firmly pressed to its seat). By
unscrewing the valve is opened in the usual way, and by screwing down, closed.
c serves for pressing together the packing of the stuffing-box. In Fig. 2 c is entirely
arranged in the interior of the valve case. d and fare closing-caps, the latter of
which can serve at the same time as valve-key.
Both the closing-caps d and are firmly, screwed down during transportation.
When gas is to be let out of the container both the closing caps d and fare first
removed and the outlet piece g connected in the usual manner with the place of
application by means of a pipe in which has been inserted an apparatus for
diminishing pressure. On employing the latter, the valve b remains open until the
container is discharged, so that sometimes during several days the pressure of the
liquefied gas presses on the packing of the stuffing-box and during this time
the packing cannot wholly prevent the high pressed gas of the container from
escaping so that a loss of the valuable gas takes place. 1 avoid this loss of gas
according to the present invention by firmly screwing the cap d to the valve-case a
so that the escape of the high pressed gases is prevented even if the packing h
should prove insufficient.
It is evident from the above, that gas cannot be lost either during transport, or
when in use. Necessity for dependence on the tightness of the valve on its seat, as
well as on the stuffing-box is entirely obviated.

page_text: It is necessary that the valve case be made of one piece, not jointed together,
and that the closing-cap d completely covers the head of the valve shaft together
with the stuffing-box so that the whole of the internal parts of the valve are in an
enclosed air-tight space, which is enveloped on all sides with a metal covering.
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 :
A stop valve for the containers of high pressure and liquefied gases, having a
valve case made of one piece of metal provided with a closing cap which in screwed
-down condition effects the enclosing of all the internal parts of the valve in an
enclosed airtight space entirely enveloped in a -metal covering, so that with open
valve and leaky stuffing-box no loss of gas can ensue.
Dated this 13th day of May 1896.
OSCAR BRÜNLER.