Improvements in or connected with Screw-down Valves.
Year: 1892

page_text: Date of Application, 8th Apr., 1892
Complete Specification Left, 9th Jan., 1893-Accepted, 18th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in or connected with Screw-down Valves.
I, HERMANN LÜLSDORFF, Manufacturer, of Neuss, near Cologne, Germany,
do hereby declare the nature of this invention to be as follows:-
This invention relates to stop valves or apparatus for controlling the flow of
fluids through pipes, by means of a spherical valve, and has for its object, to
construct such appliances in such a manner, that a slight effort is sufficient, to close
the liquid passage tightly, so as to avoid trickling, also to avoid the liability to
get out of order.
Such a valve is illustrated by the accompanying drawings, in which
Fig. 1 is a vertical section when the passage is closed, and Fig. 2 the same, when
the liquid passage is completely open.
Figs. 3, 4 and 5, represent details.
The valve casing is lined with a tubular valve seat of indiarubber or other
suitable material. On the latter rests a ball of metal, glass, porcelain or other
suitable material, which is lifted by the flowing liquid, and which constitutes the
valve proper.
The lower end of the valve spindle, shown separately, in Fig. 5, carries a
spherically hollow cup which fits upon the ball and serves to press the latter upon
the valve seat, when the screw spindle is turned down by hand.
The valve seat may be held in place by means of a tubular frame, fixed at the
upper end to the cover, containing the nut for the screw spindle, and pressing with
the lower edge upon the elastic or compressible valve seat.
Fig. 3 is a horizontal section through the lower part of the tubular holding-down
frame.
To prevent the valve seat from being damaged by the water flowing through, its
lower edge is protected by a flange formed in the metallic valve casing.
Dated this 8th day of April 1892.
FAIRFAX & WETTER,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or connected with Screw-down Valves.
I, HERMANN LÜLSDORFF, Manufacturer, of Neuss, near Cologne, Germany,
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 :-
This invention relates to stop valves or apparatus for controlling the flow of
fluids through pipes, by means of a spherical or conical valve, and has for its object,
to construct such appliances in such a manner, that a slight effort is sufficient, to
close the liquid passage tightly, so as to avoid trickling, also to avoid the liability
to get leaky by prolonged use.
Such a valve is illustrated by the accompanying drawings, in which
Fig. 1 is a vertical section, when the passage is closed, and Fig. 2 the same,
when the liquid passage is completely open.
Fig. 3, represents a guide frame or perforated lining for guiding the ball.
The valve casing A is provided with a tubular valve seat h of indiarubber or
other suitable elastic or soft material. On the latter rests a valve, preferably of
spherical or conical shape. This valve may either be loose, or connected with the

page_text: valve spindle, so that it can turn on the axis of the same, as represented by
Fig. 2.
The lower end of the valve spindle is provided with a screw thread, and may
carry a spherically or conically, hollow cup which fits upon the ball and serves
to press the latter upon the valve seat, when the screw spindle is turned by hand.
The valve seat may be held in place by means of the tubular frame a, which in
this case extends up to the cover B, containing the nut for the screw spindle, and
presses with the lower edge upon the elastic or compressible valve seat h.
To prevent the valve seat from being damaged by the water flowing through, its
lower edge is protected by a flanger formed in the metallic valve casing.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is ;-
A screw down valve, having a valve seat which is formed by a tubular piece of
elastic or soft material fitted into the valve casing, so as to form a tight joint at
the circumference, and a spherical or conical valve adapted to close the passage
formed in the said valve seat, substantially as described and illustrated by the
drawings.
Doted this 7th der of Lonnor 1902
Dated thie 7th der of
7th day
January
1902
H. LÜLSDORFF,
By Fairfax & Wetter,
433, Strand, London, Agents.
H. LÜLSDORFF,
By Fairfax & Wetter,
433, Strand, London, Agents.