An Improved Diaphragm Cock for Gas, Water, or Steam.
Year: 1889

page_text: Date of Application, 14th Sept., 1889
Complete Specification Left, 2nd Dec., 1889-Accepted, 10th May, 1890
PROVISIONAL SPECIFICATION.
An Improved Diaphragm Cock for Gas, Water, or Steam.
We, JEAN ZEHREN, and AUGUSTE ZEHREN, trading as Zehren Frères, 235, Faubourg
St. Martin, Paris, Manufacturers of Taps, Cocks, etc., do hereby declare the nature of
this Invention to be as follows:-
A fixed diaphragm or plate is placed perpendicularly to the axis of the conduit,
between two separate tubes.
This diaphragm is furnished with two orifices to allow passage of the fluid or
vapour.
Upon this diaphragm slides a plate, the surfaces in contact being accurately adjusted,
turning upon an axis parallel to the tubes.
The sliding plate is pierced with two orifices similar to those of the diaphragm,
When these orifices are in position, each above its corresponding one, the cock is
entirely open. By impressing a turning movement to the sliding plate, of a quarter
of a revolution, its orifices correspond to the solid parts of the diaphragm and the
cock is thus completely closed. In the intermediate positions of the plate on reference
to the diaphragm, the passage is open to a greater or less extent.
This system permits the passage of the fluid to be regulated as may be desired.
The movable plate may be put in motion by the aid of two toothed bevel wheels,
one of which is attached to the sliding plate, or an endless.screw or worm may gear
with a toothed segment, attached to the sliding plate, or the movement may
produced by means of a rack.
The fixed diaphragm, and the movable plate may be of conical form.
be
The fixed diaphragm, in place of being independent, may form part of the casting
of one of the tubes, or in place of employing two plane surfaces. adjusted to each
other, the diaphragm may be furnished with flaps of leather, Indian rubber, asbestos
or other material for ensuring complete tightness.
Double tightness may be obtained by employing two fixed diaphragms and two
movable plates. This disposition is useful in cases of great pressure.
The two tubes in place of being connected by bolts, and nuts, may be screwed
directly one upon the other, or united by means of a single central bolt, forming
the axis of the movable plate.
Dated this Thirteenth day of September 1889.
JEAN ZEHREN.
AUGUSTE ZEHREN.
COMPLETE SPECIFICATION.
An Improved Diaphragm Cock for Gas, Water, or Steam.
We, JEAN ZEHREN, AUGUSTE ZEHREN, Manufacturers of all kinds of Taps, and.
Cocks, 235, Rue du Faubourg St. Martin, Paris, 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 may be described as follows. It is a cock composed of two cast
tubes, with two diaphragms, interposed. One of these diaphragms is fixed, the other
is movable, and slides in turning on the first.
This movement of rotation is obtained, either by an endless screw, acting on a
toothed segment forming part of the second diaphragm, or attached to it; or by a

page_text: bevel wheel engaging with a corresponding wheel equally attached to the movable
diaphragm.
In case of very strong pressures we employ a double system, i.c. composed of two
diaphragms fixed, and two movable, acted upon by a single bevel wheel.
Fig. 1. section in length, of a cock operated by a bevel wheel.
Fig. 2. section perpendicular to its axis of a cock operated by an endless screw.
Fig. 3. section lengthways, of a double system cock, two diaphragms fixed, and
two movable operated by a bevel wheel.
Fig. 4. section perpendicular to its axis of a conical diaphragm.
Fig. 5. section lengthways of a cock with conical diaphragms.
Fig. 6. section of a fixed diaphragm, along the axis of the cock, with strips
inlaid.
Fig: front view of same diaphragm with strips inlaid.
In the different figures, the same letters refer always to the same organs.
In fig. 1. a diaphragm or plane partition A perpendicular to the axis of the
conduit is interposed fixed by two joints, between the two tubes B B', and consequently
immovable.
This diaphragm is pierced by two orifices a b, c d to admit passage of the fluid.
Upon this diaphragm presses, a second one D accurately adjusted to the first,
and turning upon an axis C which controls its rotating movement. This second
diaphragm is equally pierced with two orifices corresponding to those of the first.
When these orifices are superposed, two by two, the cock is entirely open. By
giving to diaphragm D a movement of a quarter of a revolution, its orifices corre-
spond to the solid parts of A, and the cock is entirely closed. In all the intermediate
positions the cock is open or closed to a greater, or less extent.
It is to be remarked, that this system permits of regulating the passage of the
fluid as desired.
In fig. 1. the cock is operated by a bevel wheel engaging with a corresponding
bevel wheel attached to diaphragm D.
Fig. 2 represents the same cock excepting that it is an endless screw which acts
upon the toothed segment attached to diaphragm D.
In fig. 3 the two fixed diaphragms form part of the castings of the tubes B B¹,
which are united by screws or bolts at V X. The two movable diaphragms are
pressed upon their seats by a coiled spring interposed I, or by two springs, one for
each diaphragm J J.
Figs. 4 and 5 represent a cock in which the two diaphragms instead of being plane,
are conical the movable diaphragm D turning within the fixed diaphragm A as the
plug of a tap in its socket. The orifices a b c d allow passage of the fluid.
wheel operates the diaphragm D.
A bevel
Figs. 6 & 7 indicate another form of diaphragm around the orifices of the fixed
diaphragm, and distant from the edges, the space of two or three millimetres, we
place dovetail slots U U whose width increases slightly towards their bases.
these slots we force a strip of leather, Indian rubber, asbestos, or other material,
Into
projecting from the surface of the diaphragm by a small distance. It is upon these
strips that the movable diaphragm presses, and slides.
dispense with the adjusting of the surface of the movable diaphragm, to the surface
By this disposition, we
of the fixed one.
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 of two diaphragms, plane, conical, half round, in general
of whatever form, one movable. the other fixed (this last being independent of,
or forming part of the conduits) perpendicular to the conduit, pierced with one,

page_text: two or several orifices, the revolution of which, hinders or allows passage of a fluid,
said revolution, being obtained either by bevel wheels, endless screw
mechanical arrangement.
or other
2. The disposition which consists of employing the double system for resisting
strong pressures i.e. two fixed diaphragms, and two movable ones.
3. The employment of strips inlaid in slots dispensing with adjustment.
Paris, Dated this 25th day of November 1889.
JEAN ZEHREN.
AUGUSTE ZEHREN.