Note: Descriptions are shown in the official language in which they were submitted.
i~9~L~Z
Automatic valve systems or devices are
known (U.S. patent Nr.,3.923.081) to prevent communication
between waste pipes and atmosphere and which operate so
th'at the discharge of contaminated air is prevented and the
valve opens to allow air to enter the pipes when a nega-
tive pressure occurs therein.
~' ' These valves satlsfy requirements according
to which the pipes'projecting from roofs may be dispensed
with and'~',be replaced by pipes housed inside buildings
on condition that the general pipeline is provided with
an automatic valve which does not allow stale air to escape
but which opens to allow air to~enter in'the event of a
negative pressure, e.g. on the flushing of water closets.
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The object of this invention is to produce
devices of a simple design intended to solve various
important problems associated with the use of such auto-
matic valves.
These problems are as follows :
a) The valve operation must be absolutely
reliable and the valve capacity must be capable of being
increased.
b) The use of a single valve type must be
possible for connecting vent pipes of dif~erent diamekers.
c) The valve must be protected thermally
and against the risk of the entry of foreign bodies which
might prevent correct operation.
The device according to the invention
is characterised essentially in that a vertical tube cons-
tituting the body of the valve comprises at its upper end
a constriction in the form of a Venturi which cooperates
with a cover so as to form a peripheral air inlet provi-
ded with a valve situated at the exterior of the constric-
tion and which can be tilted when a negative pressure
occurs in the pipes while permitting the ~resh air to
penetrate into the vertical pipe and which when the
press~re is equilibrated or when there is overpressure
occupies a position o~ obturation in which the escape of
contamined air is prevented.
On the annexed drawings :
- Figure 1 is a section of the device.
Figure 2 is a detail in section to illustra-
te one of the advantages of the invention.
- 2 -
z
Figuxes 3, 3a, 3b and 3c show the possibility
of using a single type of automatic valve for pipes of dif-
ferent diameters.
Figure 4 is a section of a modified embo-
diment with respect to figure 1.
Figure S shows an example of application
of the valve according to the invention.
Referring to figure 1, the valve body
comprises a vertical tube 1 connected to a venting pipe
(not shown in figure 1) and comprising at the top end a
constriction in the form of a Venturi formed by a frusto-
conical neck 2 terminating in a lip 3 and cooperating with a
cover 4 so as to form a peripheral air inlet 5 in the form
of a duct which can be closed by an annular valve 6 ;
in the example shown, thP latter located at the exterior
of the frusto-conical neck rests on a seat formed by the
lip 3 and a lip 7 provided on the inner periphery of the
cover.
It will be seen that if a negative pressure
occurs in the vertlcal tube 1 for example as a result of
the draining, flushing or emptying operation, the valve
6 will be lifted so that fresh air can penetrate into
the tube 1 via the duct 5. When the pressure is balanced
or when there is an overpressure, the duct 5 is shut off
by the valve 6 so that the contaminated air is prevented
from leaving.
Because at the entry of the Venturi, at 3,
the diameter is smaller than ~he diameter of the cylinder
1, an increase of the capacity of the valve is obtained
which renders possible the use in buildings having a
greater number of stores than with the known svstems.
One feature is that the inner wall 8 of
the cover 4 is inclined to an extent such that the valve
6 can never be jammed in an oblique or horizontal position
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in whlch the valve might stay in the open position when
the pressure has been balanced (reference 61, figure 2),
Also, the dimensions are so selecked that
the valve 6 also covers the air inlet in its position
of rest even if it touches the wall on one side.
As shown in Figure 1, an insulation 9 is pro-
vided around the cover 4-8 and the end of the cylindrical
part of the body 1 and is formed with a circular recess
10 providing communication between the external air and
the inlet duct 5.
The air inlet aperture 10 is conventionally
provided with an element, e.g. a netting 11 so disposed
and constructed as to prevent insects or foreign bodies
from entering.
The insuIation 9 enables the air to be
kept hot inside the system and around the movable part
6 and prevents the valve from freazing.
Also, for transportation, the insulation
9 may be completed by a removable part (not shown) cove-
ring the entire bottom part of the cylinder 1.
A tape 12 may be wound around both insulating
elements in order to lock such a packing which is obtained
on transport and maintain proper operation during that ;
period.
This tape is removed on use.
Figure 4 relates to an embodiment which is
particularly suitable for practising the invention.
In this instance the cover makes an element
which is completely separated and is adapted to fit on
the cylinder.
Figures 3, 3a, 3b and 3c show how a single
valve type of adequate capacity can be used to connect vent
pipes 13 of different diameters (e.g. 50 mm : figure 3 ;
75 mm : figure 3a ; 90 mm : figure 3b ; 110 mm : figure 3c).
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This possibility can be obtained as follows : ¦
a) By locatlng the c,ylindrical body 1 out- ¦
side the pipe 13 (figures 3-3a) or inside the pipe 13
(figures 3b-3c) ;
b) By a varying and appropriate arrangement
of the gaskets 14 (figures 3-3c).
An important advantage is that in the case
of the invention the interior of the cylindrical body 1
remains sntirely free so that it can be fitted to a device
such as a siphon.
A significant advantage is that with the
invention, the inner portion of the cylindrical body 1
remains entirely free which permits adaptation among
others to an apparatus such as a siphon.
Figure 5 shows an installation for a
dwelling in which a number of devices 21 used for the
discharge of waste water (lavatory, basins, sinks, etc.)
are each pxovided with a trap or siphon 20 to each of
which is connected a pipe 18 connected to the waste pipe 23.
On the other hand a plurality of automatic
valves is also provided at 19, this valve being o~ the
type shown in figure 1 on a vent pipe 13.
The pipes 13 and 18 are connected to the
waste pipe 23 via a venting pipe 24 provided with a fan 25
having an outlet 26 for delivery to atmosphere.
It is understood that when this fan is
in operation it produces a negative pressure in all the
pipes 13-18-2~ and lifts the different valves 6 of the
different valves 19 (figures 1 and 4).
In that way stale air can thus be discharged
from~'~the rooms via pipe 24 at 26.
The waste water discharge pipes are used
at the same time as pipes for the air evacuating system from
the building, all the system being put into underpressure.
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