Improvements in Screw-down Valves.
Year: 1899

page_text: Improvements in Screw-down Valves.
We, EDOUARD MOLAS, EUGÈNE LAMIELLE, and ALPHONSE TESSIER, all of
45, Rue du Chemin Vert, Paris, France, Engine Builders, do hereby declare
the nature of this invention to be as follows:-
Hitherto the coned point of a screw-down valve used for highly-compressed
air and oxidizing gases has usually been made of steel in one with the screwed
stem and has consequently been liable to rapid oxidation and owing to the
rotary motion in opening and closing, a constant leakage ensues.
The object of the present improvements is to remedy the above objections by
providing a screw-down valve used for the above purposes with an inoxidizable
point.
Our invention is characterized by the employment of a conically pointed valve
of German silver made independent of the screw stem from which it receives
only vertical sliding motion, a perfectly tight joint being made by means of a
leather washer pressed up by the guiding collar and gland."
Our invention is illustrated in the accompanying drawing wherein Figure 1
represents an elevation and Figure 2 a longitudinal vertical section of our im-
proved valve. Figure 3 is a horizontal section on line A B Figure 2. Figure 4
is a separate vertical transverse section of the body. Figure 5 is a vertical
section of the packing gland. Figure 6 is a vertical section of the cap. Figure 7
is a vertical section of the valve made of German silver. Figure 8 is a vertical
section of the screw stem. Figure 9 is a plan and vertical section of the guide
ring for the valve whereby it is prevented from rotation in opening and closing.
The same letters of reference denote like parts in all the figures,
The cone-pointed valve of German silver receives vertical movement by
means of screw-stem 6 having a left handed thread screwing into a correspond-
ingly threaded socket in the valve, the valve being prevented from turning by
a screw-stud c engaging in the groove d of a guide ring e received within the
body and held fast by screwing down the gland f so as to press ring e against
the leather washer and prevent all leakage when the valve is raised off its
seat h. The screw stem 6 is prevented from longitudinal motion by a collar
upon it being held to turn between gland f and a cap m. screwing thereon.
To open the valve and give passage to the fluid under pressure through the
channels and k, the screw stem is turned from right to left whereby to raise
the valve a off its seat the reverse movement closing the valve.
The valve being made of inoxidizable metal, it is prevented from becoming
oxidized by contact with the fluid and the pressure of the gland upon the guide
ring and washer ensures a perfectly tight joint under any pressure.
171
P
1000

page_text: Improvements in Screw-down Valves.
We, EDOUARD MOLAS, EUGENE LAMIELLE, and ALPHONSE TESSIER, all of
45, Rue du Chemin Vert, Paris, France, Engine Builders, 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:-
Hitherto the coned point of a screw-down valve used for highly-compressed
air and oxidizing gases has usually been made of steel in one with the screwed
stem and has consequently been liable to rapid oxidation, and owing to the
rotary motion in opening and closing a constant leakage ensues.
The object of the present improvements is to remedy the above objections by
providing a screw-down valve used for the above purposes with a point of
German silver or other inoxidizable material.
Our invention is characterized by the employment of an inoxidizable conically
pointed valve made independent of the screw stem from which it receives only
vertical sliding motion, a perfectly tight joint being made by means of a leather
washer pressed up by the guiding collar and gland.
Our invention is illustrated in the drawing accompanying our Provisional
Specification wherein Figure 1 represents an elevation and Figure 2 a longi-
tudinal vertical section of our improved valve. Figure 3 is a horizontal section
on line A B, Figure 2. Figure 4 is a separate vertical transverse section of the
body. Figure 5 is a vertical section of the packing gland. Figure 6 is a vertical
section of the cap. Figure 7 is a vertical section of the cone pointed valve made
of German silver. Figure 8 is a vertical section of the screw stem. Figure 9
is a plan and vertical section of the guide ring for the valve whereby it is pre-
vented from rotating in opening and closing. The same letters of reference
denote like parts in all the figures.
The cone-pointed valve of German silver receives vertical movement by
means of screw-stem having a left handed thread screwing into a correspond-
ingly threaded socket in the valve, the valve being prevented from turning by
a screw-stud c engaging in the groove of a guide ring e received within the
body and held fast by screwing down the gland of so as to press ring e against
the leather washer g and prevent all leakage when the valve is raised off its
seat h. The screw stem is prevented from longitudinal motion by the collar
with which it is provided being held to turn between gland fand a cap m screw-
ing thereon.
To open the valve and give passage to the fluid under pressure through the
channels and k, the screw stem is turned from right to left whereby the
valve is raised off its seat, the reverse movement closing the valve.
The cone-pointed valve being made of inoxidizable metal is prevented from
becoming oxidized by contact with the fluid and the pressure of the gland upon
the guide ring and washer ensures a perfectly tight joint under any pressure.
It is to be understood that the form, dimensions, materials and details of con-
struction of the improved valve may be varied without in any way departing
from the principle of our invention.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, we declare that what
we claim is :-

page_text: employment of a conical pointed valve of inoxidizable metal operated by an in-
dependent screw stem in combination with a guide ring which bears constantly
upon a washer to ensure a tight joint, substantially as hereinbefore described
and illustrated in the drawings.
Dated this 4th day of November 1899
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, Lontlon.