New or Improved Tap for Steam or other Fluids.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
New or Improved Tap for Steam or other Fluids.
ALFRED LESTUDIER of Rue du Chevalier Francais, Lille, France, Mechanician,
do hereby declare the nature of this invention to be as follows:-
The object of this system of making taps with a chamber inside the shell is to
allow for the swelling of the latter as well as of the tap plug. The entrance hole
of the tap being situated in the opposite direction to the entrance of the steam,
prevents any accumulation of scale or foreign substances against the plug and
consequently the shell or plug will not be gripped.
This tap is composed of a tap body in which the shell is formed. The latter
is surrounded by a chamber in which the steam constantly cirrculates, whether
the tap be opened or closed, thus allowing for the swelling of the shell and of the
plug. When the plug is turned the steam escapes by the port in the shell and
plug, passing through the latter to escape at its bottom.
This tap can be made in all shapes and sizes and be used for liquids, steam
and gases.
Dated this 28th day of November 1896.
L. DUVINAGE,
Agent for Applicant.
I, ALFRED LESTUDIER, of Rue du Chevalier Francais, Lille, France, Mechanician,
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:-
My invention relates to taps and especially to that kind of taps used in
machinery and serving for the supply of very hot or very cold fluids.
The object of my invention is to provide such a tap the working of which will
not be influenced by the temperature of the said fluids.
In the annexed drawings:
Fig. 1 shows a vertical section of the tap according to its longitudinal axis.
Fig. 2 represents a section according to a horizontal plane crossing the axis of
the passages M, N.
Fig. 3 a vertical section by a plane passing through the middle of the box and
perpendicular to the section of Fig. 1.
The apparatus is composed of a body of the tap with two tubular passages, a
rotative truncated plug and a holding apparatus keeping the plug in the box.

page_text: The body B of the tap presents at each side a passage M and N terminated by a
fixing flange for the junction on one side, with the supply pipe, and on the other
side with the feeding-pipe. About the middle of the body B of the tap the cavity
of the box is hollowed out; the sides of this box instead of being solid as in
ordinary taps, are hollowed out so as to form around the said box a circular
chamber C, (Figs. 1, 2, and 3) which surrounds it from the two sides of the axis
and ending at the passage M at the part diametrically opposite. The core of the
mould for this circular chamber is easily executed owing to the supports it can
find in the assemblage with the core made for the truncated hole of the box.
The passage N cast in the body B of the tap (Fig. 1) turns around the bottom
and the side of chamber C, terminating at the bottom of the box whose lower
part is closed against it. The plug A of the tap is hollowed in such a way as to
form a cylindrical cavity constituting with the lower part P of the box the outlet
chamber for the fluid; this outlet chamber is always filled with fluid whether the
tap be open or shut, as also is the chamber C; we can understand that, for this
reason the plug of the tap and the sides of the box are always at the same
temperature and dilate in a uniform manner being constituted of the same metal.
The pressure of the fluid tends to uplift the plug A out of the box, since the
latter, being closed at its lower part does not admit of the use of a tail to hold
the plug under the box as in ordinary taps; in our system we hold the plug in the
box by means of a cross piece E which leans upon the shoulder of the plug and is
pressed in a proper way upon this shoulder with the aid of bolts D screwed into
two threads made in the upper part of the body B, penetrating the cross piece by
passage holes made in it and realizing the desired tightening by means of nuts Dĭ.
If we suppose the tap to be open, in the position represented by Figs 1 and 2
of the annexed drawing, the fluid coming through the passage M enters the
chamber C escapes by the hole H made in the side of the box and by the cor-
responding hole H made in the plug, penetrates into the interior of this plug
which it traverses heating its sides and enters the tube N.
The situation of the hole of the box prevents the tartar and other matters
brought by the fluid from lodging on the plug, since these matters are stopped by
the wall C of the chamber C and consequently no wearing can take place in the
box or plug by the opening or shutting of the tap.
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:
A tap for very hot or very cold fluids characterized by a circular chamber
around the box and the plug, keeping both of them in an equal temperature,
producing a uniform dilatation, so as to prevent all wearing of these two organs,
an advantage which is also assured by the arrangement of the holes which screen
the plug from the direct action of the fluids and from the impurities they bring
with them.
1000
L. DUVINAGE,
Agent for Applicant.