[0001] The present invention relates to a method of and apparatus for cleaning beer lines,
according to the pre-characterising part of claim 1 and claim 8 respectively.
[0002] In this Context the word "beer" includes ales, lagers, porters and stouts.
[0003] It is industry standard that in premises serving beer, lines carrying beer from cellar
(or other storage area) to bar dispense (or dispensing) pumps must be cleaned regularly,
such as every seven days, to avoid build-up of yeast and bacteria in the lines. Failure
to clean lines regularly results in beer having poor taste, appearance and odour.
Traditional manual cleaning requires the lines to be filled with a detergent solution,
allowed to soak for half an hour, and then vigorously rinsed. The process normally
takes about three hours for an average size British licensed premises.
[0004] DE1607988A discloses a method of cleaning a pipeline comprising providing a flow
of a first fluid, water, through a conduit, one orifice opening into the conduit such
that a second fluid (detergent) is drawn through the orifice into the first fluid
at a specified rate relative to the rate of flow of the first fluid to provide a flow
of a solution of the first fluid (water) and the second fluid (detergent) of predetermined
concentration; supplying the flow of solution through the pipeline; allowing such
solution to remain in the pipeline for a predetermined time; providing a flow of the
first fluid through the conduit while preventing the second fluid being drawn through
the orifice into the conduit thereby flushing the solution from the conduit and the
pipeline to flush the solution from the pipeline; and
an apparatus for cleaning a pipeline, comprising a conduit for connection to a
supply of a first fluid (water) and to the pipeline; one orifice opening into the
conduit and for connection to a supply of a second fluid (detergent) such that a flow
of the first fluid along the conduit draws the second fluid into the conduit in a
predetermined proportion relative to the first fluid; means for closing a connection
between the orifice and the supply of the second fluid; and means for opening and
closing a connection between the conduit and the pipeline whereby the conduit can
be flushed by the first fluid free of the second fluid with the first fluid flushing
the pipeline.
[0005] US5,858,114A disclosed a method of cleaning a beer dispensing system including at
least one beer supply line for supplying beer to dispensing means, including connecting
the beer supply line in a closed circuit flow loop including control valve means,
introducing a cleaning or flushing fluid into the flow loop, and operating the control
valve means to cause the cleaning or flushing fluid to flow successively and alternately
in opposite directions in the closed circuit flow loop.
[0006] It is an object of the present invention to provide, at least in preferred embodiments,
apparatus or equipment by means of which cleaning of beer lines can be automated and
carried out in a much reduced time. To this end it is necessary to use a much stronger
cleaning/detergent solution and, to avoid line damage, strictly control the strength
of the solution and the length of time it is allowed to remain in the lines.
[0007] The above object is achieved according to the invention by the method as defined
in claim 1 and by the apparatus as defined in claim 8.
[0008] Particular embodiments of the invention are the subject of the respective dependent
claims.
[0009] The invention is further described below by way of example with reference to the
accompanying drawings, wherein:
Figure 1 is a schematic diagram of apparatus according to the present invention as
installed in a licensed premises; and
Figure 2 is a perspective view of a manifold of the apparatus of Figure 1.
[0010] Except as described below the apparatus shown in the drawings is installed in a cellar
of the licensed premises.
[0011] Referring to Figure 1 of the drawings, the apparatus shown therein comprises a manifold.
[0012] As shown in Figure 2 of the drawings, the manifold consists of a solid block having
a main, large diameter central channel or conduit 1 and three small diameter channels
or orifices FO1, FO2 and FO3 opening into the central channel.
[0013] Referring back to Figure 1 of the drawings, the apparatus shown therein comprises
a water reservoir 2 connected through a line to one end of the central channel 1 of
the manifold. A shut-off valve V5 is provided in the line. The other end of the central
channel 1 is connected to a pump P, which in turn is connected through a one-way valve
V6 to one end of a ring main.
[0014] The channels FO1 and FO2 of the manifold are connected to respective lines provided
with respective valves FV2 and FV3, these lines being connected to a common line provided
with a valve FV1 and connected to a detergent bottle. At the inlet of the common line
from the interior of the detergent bottle a filter F is provided. The channel F03
is connected to a pressure switch PS4.
[0015] The water reservoir is connected through a valve 3 to water mains.
[0016] Beer dispense lines run from the cellar to main and subsidiary bars of the licensed
premises.
[0017] The ring main is connectable, intermediate its ends, to ends of beer dispense (or
dispensing) lines. For this purpose the ring main is provided with connectors or sockets
engagable with connectors or sockets at the ends of the dispense lines in the cellar.
Each dispense line is provided with a respective valve, such as valve V7, and, at
its end in one of the bars, is provided with a dispense pump or tap.
[0018] The ring main is also connected, at its end remote from the pump P, to two parallel
lines 18 and 19. The line 18 is provided with a manually operable valve 18. The line
19 is provided with a purge unit 20 consisting of a solenoid valve FV4.
[0019] Sensors and switches are associated with the reservoir and the detergent bottle,
and with an operator interface in the cellar and in the main and subsidiary bars.
All the sensors, switches and valves (except the valve in the line 18) of the apparatus
are interfaced with a sequential program of a programmable logic controller (PLC),
provided on a control panel in the cellar, by means of discrete input (DIN) and discrete
output (DOT) channels. The control panel is provided with a keypad and a display both
connected to the PLC.
[0020] The operator interface consists of command units (CU) provided in the cellar and
in bars.
[0021] Switches operated by the command unit in the cellar are shown towards the left of
Figure 1. Switches operated by the command units in the bars are shown towards the
top right corner of Figure 1.
[0022] A cleaning programme or other programme can be selected on the control panel, whereby
the PLC causes the same programme to be run on successive initiations of programmes
until a different programme is selected.
[0023] The desired cleaning programme is selected having regard to build up for different
products, delays in cleaning and other factors.
[0024] The respective taps of barrels, casks or kegs (hereinafter referred to as "barrels
") of various beers (products) in the cellar are connected to the dispense pumps in
the bars
via a respective connector or socket on each barrel and a corresponding connector or
socket on each of the beer dispense lines.
[0025] When a barrel has emptied, a drainage connection, in the form of a hose or waste
pipe, in one of the bars, is attached to the dispense pump of the dispense line from
the barrel. The hose or waste pipe is connected to a bar drain. In the bar the dispense
pump of the dispense line is opened, and in the cellar the barrel is disconnected
from its dispense line and the beer dispense line of the empty barrel is engaged with
the corresponding connector on the ring main thereby to connect the ring main to the
dispense line.
[0026] A button is then pushed on any one of the command units to initiate a cleaning cycle
in accordance with a selected cleaning programme to clean the beer dispense line of
the emptied barrel.
[0027] Cleaning programmes which may be selected include a standard cleaning cycle, an increased
detergent cleaning cycle and an extended cleaning cycle (with or without increased
detergent). Such programmes may include provision for selection of a single beer line
to be cleaned or for cleaning of multiple beer lines.
[0028] The apparatus operates as described below, under the control of the PLC to effect
the standard cleaning cycle or the increased detergent cleaning cycle, each of which
takes about five minutes.
[0029] Pressure in the main channel 1 of the manifold is monitored through the channel F03
by the pressure switch PS4.
Water reservoir filling
[0030] The water reservoir is filled with water from the water mains.
First dispense line rinse
[0031] The shut off valve V5 and the valve, such as valve V7, in the dispense line to be
cleaned, are opened (the valves in the other dispense lines remaining closed throughout
the cleaning cycle) and the ring main and the dispense lines are rinsed by pumping
water, by means of the pump P, from the water reservoir through the shut-off valve
V5, the manifold, and the dispense line to the bar drain, whereby the connected dispense
line is rinsed, the line being cleared of any debris, and yeast deposits in the line
loosened.
Detergent bottle back flush
[0032] With the valves, such as valve V7, in the dispense lines and the valve FV4 dosed,
the valves FV1 and FV3 open momentarily, with the pump P operating, whereby the lines
from the detergent bottle to the manifold are pressurized. The pressure drives water
briefly back through the filter F to dislodge any crystals of detergent that would
otherwise cause the filter to become clogged and reduce flow of detergent solution
in subsequent steps of the cleaning cycle.
Detergent injection
[0033] The valve FV1 and the valve, such as the valve V7, in the dispense line to be cleaned
are opened and in the increased strength detergent cleaning cycle, but not in the
standard cleaning cycle, the valve FV2 is also opened, whereby liquid detergent is
drawn from the detergent bottle through the orifice F01 and, if the valve FV2 is opened,
through the orifice F02 into the manifold where it mixes with water being drawn through
the central channel of the manifold by the pump from the water reservoir to the ring
main and thence to the beer dispense line. When the valve FV1 is opened the detergent
mixed with the water in the central channel forms a detergent solution of normal strength,
whereas when the valve FV2 is additionally opened the detergent mixed with the water
in the central channel forms a relatively concentrated (e.g. double or triple strength
as compared with when only the valve FO1 is opened) detergent solution. The detergent
solution is pumped by the pump P through the one-way valve V6 and the ring main into
the dispense line to be cleaned.
[0034] It will be appreciated that the pressure drops resulting from the difference between
the suction at the inlet to the pump and the static heads in the reservoir and the
detergent bottle, together with the diameters of the main and small channels in the
manifold determine the respective flow rates of the water, through the valve V5 and
the detergent through the valves FV1 and FV2 (if opened) to the manifold.
[0035] The PLC determines, in accordance with the cleaning programme selected whether or
not both valves FV1 and FV2 are opened to enhance cleaning.
[0036] The diameters of the small diameter channels FO1 and FO2 in the manifold are determined
such that, with the pressure drops pertaining, the relative flows of water and detergent
into the manifold will yield detergent solution of the desired concentration (within
a specified tolerance).
Manifold back flush
[0037] With the pump P switched on and valves FV1 and FV4 closed and valves V5 and V7 open,
the valves FV2 and FV3 open for a short period. The pump thereby draws water from
the reservoir to flush out the central channel and the small diameter channels FO1
and FO2 of the manifold.
Soak period
[0038] The pump P is switched off. The one-way valve V6 prevents reverse flow of detergent
solution from the beer dispense lines and the ring main towards the pump and the ring
main and the beer dispense line are left to soak in still (non-flowing) detergent
solution for a specified period, such as three minutes.
[0039] Second dispense line rinse
[0040] The same operations as in the first dispense line rinse are effected again to clear
the dispense line being cleaned of detergent solution.
Ring main rinse
[0041] With the pump P remaining switched on, the valve FV4 is opened and the dispense lines
are isolated by closure of the valves, such as valve V7. The pump P pumps water from
the reservoir 2 and thereby flushes residual traces of detergent solution from the
ring main. Rinse water is pumped, by the pump from the reservoir through the ring
main and the valve FV4 to the cellar drain to clear any residual detergent solution
from the ring main.
[0042] Completion of the cleaning cycle is then signalled in the bars and in the cellar.
[0043] In the increased detergent cleaning cycle, each of the first dispense line rinse,
the second dispense line rinse and/or the ring main rinse may be for a longer period
of time than in the standard cleaning cycle.
[0044] The cellar connector of the cleaned dispense line is then manually removed from the
ring main and connected to a new barrel.
[0045] The remaining rinse water in the dispense line is emptied through the waste pipe
until beer is seen in a site glass on the tap connection. The waste pipe is then removed
and beer can then be served.
[0046] The water reservoir ensures that once a cleaning cycle has begun it cannot be interrupted
due to any interruption in the mains water supply.
[0047] The short duration of the cleaning cycle makes it practicable for beer dispense lines
to be cleaned as respective barrels become empty. By cleaning each beer dispense line
only when the respective barrel has emptied the normal beer loss or wastage of beer
remaining in the beer dispense lines is avoided.
[0048] The extended cleaning cycle takes about ten minutes.
[0049] The extended cleaning cycle comprises like steps to the standard cleaning cycle and/or
increased detergent cleaning cycle. It includes the steps described above up to and
including the Soak period, followed by a shorter rinse (in the manner described above)
of the dispense line, and then repetition of the Detergent Injection Step, the Manifold
Back Flush Step, the Soak period, and then finally a rinse (in the manner described
above) of the dispense line for an extended period of time.
[0050] More than one of the beer dispense lines from the same barrel may be cleaned simultaneously
as described above, if desired, by selection of the appropriate multiple line programme
on the keypad.
[0051] The valve in the line 18 is normally kept closed but opens at the end of each cleaning
cycle to drain the ring main.
[0052] Greatly shortened cleaning time results from the high turbulence during rinsing and
greatly increased detergent strength usable by means of the present invention.
[0053] Manual cleaning uses only normal water pressure and requires a half-hour soak: it
uses only a 1% cleaning solution due to danger of line damage resulting from excess
solution strength and/or timing errors. (The detergent is a mixture of sodium hydroxide
and sodium hypochlorite capable of corroding most metals and plastics).
[0054] The PLC is programmable for lines needing more intense cleaning and rinsing between
barrels to avoid fobbing, and cleaning lines when barrels are not empty. When a line
requires cleaning but the barrel is not empty, beer can be dispensed until the line
is empty without further beer being supplied from the barrel. The barrel is then disconnected
from the dispense line and a cleaning cycle as described above is initiated.
[0055] The push button unit in the cellar enables staff not normally involved in operating
the apparatus to stop the apparatus in an emergency or to start the cleaning cycle
in accordance with the selected cleaning programme.
[0056] The display unit will indicate the stage a programme being carried out has reached
and indicates audibly and visibly warnings of malfunctions. The PLC will cause an
alarm to be sounded if a malfunction occurs and may stop the programme continuing.
1. A method of cleaning a pipeline comprising:
(a) providing a flow of a first fluid, such as water, through a conduit (1), at least
one orifice (FO1, FO2, FO3) opening into the conduit (1), such that a flow of a second
fluid passes through the orifice (FO1, FO2, FO3) into the first fluid at a specified
rate relative to the rate of flow of the first fluid, to provide a flow of a solution
of the first fluid in the second fluid of predetermined concentration;
(b) supplying the flow of the solution through the pipeline;
(c) allowing such solution to remain in the pipeline for a predetermined time;
(d) providing a flow of the first fluid through the conduit (1); and
(e) providing a flow of the first fluid through the conduit (1) and the pipeline to
flush the solution from the pipeline;
characterised in that:
i) in step (c), the solution remains static in the pipeline; and
ii) in step (d), the flow of the first fluid is provided through the conduit while
preventing the second fluid passing through the orifice (FO1, FO2, FO3) into the conduit
(1), thereby flushing the solution from the conduit (1) without flushing the pipeline.
2. A method according to claim 1, wherein the first and second fluids are both liquid.
3. A method according to claim 1 or 2, wherein the first fluid is water and the second
fluid is detergent.
4. A method according to claim 3, wherein the pipeline is a beer dispense line.
5. A method according to any preceding claim wherein there are at least two orifices
(FO1, FO2) opening into the conduit (1), such that the solution is of respective predetermined
concentrations depending upon through which of the orifices (FO1, FO2) the second
fluid passes.
6. A method according to any preceding claim, wherein whether the second fluid passes
through only one orifice (FO1, FO2, FO3) or through more than one orifice (FO1, FO2,
FO3) depends on which of a plurality of programme or cycles is manually selected on
control means.
7. A method according to claim 6, wherein the total time period during which the second
fluid passes through the orifice or orifices (FO1, FO2, FO3) depends on which programme
is manually selected on the control means.
8. Apparatus for cleaning a pipeline, comprising
(a) a conduit (1) for connection to a supply of a first fluid and to the pipeline;
(b) at least one orifice (FO1, FO2, FO3) opening into the conduit (1) and for connection
to a supply of a second fluid, and
(c) means (FV1, FV2, FV3) for closing a connection between the orifice (FO1, FO2,
FO3) and the supply of the second fluid;
characterised in that there is further provided:
(d) means (V7) for opening and closing a connection between the conduit (1) and the
pipeline, whereby the conduit (1) can be flushed by the first fluid, free of the second
fluid, without the first fluid flushing the pipeline.
9. Apparatus according to claim 8, wherein there are at least two orifices (FO1, F02)
opening into the conduit (1) and for connection to the supply of the second fluid.
10. Apparatus according to claim 9, further comprising control means (CU) on which a plurality
of programmes or cycles can be manually selected, the programmes or cycles including
a first cleaning cycle wherein only a first of the orifices (FO1) is open and a second
cleaning cycle wherein a first of the orifices (FO1) and a second of the orifices
(FO2) are both open.
11. Apparatus according to claim 10, wherein the programmes or cycles include a cycle
wherein the total time period in which the orifice (FO1) or orifices (FO1, FO2) are
open is relatively short and a cycle wherein such duration is relatively long.
12. Apparatus according to any one of claims 8 to 11, wherein the conduit (1) is comprised
as a manifold having a channel and at least one orifice (FO1, FO2, F03) opening thereinto.
13. Apparatus according to claim 12, wherein there are at least two orifices (FO1, FO2).
1. Verfahren zum Reinigen einer Rohrleitung umfassend:
(a) das Bereitstellen eines Flusses eines ersten Fluides, wie etwa Wasser, durch einen
Kanal (1), wenigstens einer Öffnung (FO1, FO2, FO3), die in den Kanal (1) mündet,
derart, dass ein Fluss eines zweiten Fluides durch die Öffnung (FO1, FO2, FO3) in
das erste Fluid mit einer spezifizierten Geschwindigkeit in Bezug auf die Geschwindigkeit
des Flusses des ersten Fluides gelangt, um einen Fluss einer Lösung des ersten Fluides
in das zweite Fluid mit einer vorbestimmten Konzentration zu erzeugen;
(b) das Zuführen des Flusses der Lösung durch die Rohrleitung;
(c) das Erlauben, dass eine solche Lösung in der Rohrleitung über eine bestimmte Zeitdauer
verbleibt;
(d) das Bereitstellen eines Flusses des ersten Fluides durch die Rohrleitung (1);
und
(e) das Bereitstellen eines Flusses des ersten Fluides durch den Kanal (1) und die
Rohrleitung, um die Lösung aus der Rohrleitung auszuspülen;
dadurch gekennzeichnet, dass
(i) im Schritt (c) die Lösung statisch in der Rohrleitung verbleibt; und
(ii) im Schritt (d) der Fluss des ersten Fluides durch den Kanal bereitgestellt wird,
während es verhindert wird, dass das zweite Fluid durch die Öffnung (FO1, FO2, FO3)
in den Kanal (1) gelangt, wodurch die Lösung aus dem Kanal (1) ausgespült wird, ohne
die Rohrleitung zu spülen.
2. Verfahren nach Anspruch 1, bei dem das erste und das zweite Fluid beide Flüssigkeiten
sind.
3. Verfahren nach Anspruch 1 oder 2, bei dem das erste Fluid Wasser und das zweite Fluid
ein Reinigungsmittel ist.
4. Verfahren nach Anspruch 3, bei dem die Rohrleitung eine Bierausgabeleitung ist.
5. Verfahren nach irgendeinem vorhergehenden Anspruch, bei dem wenigstens zwei Öffnungen
(FO1, FO2) in den Kanal (1) münden, derart, dass die Lösung von jeweils vorbestimmter
Konzentration ist, abhängig davon, durch welche der Öffnungen (FO1, FO2) das zweite
Fluid gelangt.
6. Verfahren nach irgendeinem vorhergehenden Anspruch, bei dem die Tatsache, ob das zweite
Fluid durch nur eine Öffnung (FO1, FO2, FO3) oder durch mehr als eine Öffnung (FO1,
FO2, FO3) gelangt, davon abhängt, welches von einer Mehrzahl von Programmen oder Zyklen
manuell an einem Steuermittel ausgewählt wird.
7. Verfahren nach Anspruch 6, bei dem die gesamte Zeitdauer, während derer das zweite
Fluid durch die Öffnung oder die Öffnungen (FO1, FO2, FO3) gelangt, davon abhängt,
welches Programm manuell an dem Steuermittel ausgewählt wird.
8. Vorrichtung zum Reinigen einer Rohrleitung, mit:
(a) einem Kanal (1) zum Verbinden mit einem Vorrat eines ersten Fluides und mit der
Rohrleitung;
(b) wenigstens einer Öffnung (FO1, FO2, FO3), die in den Kanal (1) mündet, und zur
Verbindung mit einem Vorrat eines zweiten Fluides ausgebildet ist, und
(c) einem Mittel (FV1, FV2, FV3), um eine Verbindung zwischen der Öffnung (FO1, FO2,
FO3) und dem Vorrat des zweiten Fluides zu verschließen,
dadurch gekennzeichnet, dass ferner vorgesehen ist:
(d) ein Mittel (V7) zum Öffnen und Schließen einer Verbindung zwischen dem Kanal (1)
und der Rohrleitung, wobei der Kanal (1) durch das erste Fluid gespült werden kann,
frei von dem zweiten Fluid, ohne dass das erste Fluid die Rohrleitung spült.
9. Vorrichtung nach Anspruch 8, bei der wenigstens zwei Öffnungen (FO1, FO2) in den Kanal
(1) münden und zur Verbindung mit dem Vorrat des zweiten Fluides ausgebildet sind.
10. Vorrichtung nach Anspruch 9, die ferner ein Steuermittel (CU) aufweist, an dem eine
Mehrzahl von Programmen oder Zyklen manuell ausgewählt werden kann, wobei die Programme
oder Zyklen einen ersten Reinigungszyklus enthalten, in dem nur eine erste der Öffnungen
(FO1) offen ist, und einen zweiten Reinigungszyklus aufweisen, bei dem eine erste
der Öffnungen (FO1) und eine zweite der Öffnungen (FO2) beide offen sind.
11. Vorrichtung nach Anspruch 10, bei der die Programme oder Zyklen einen Zyklus umfassen,
bei dem die gesamte Zeitdauer, während derer die Öffnung (FO1) oder die Öffnungen
(FO1, FO2) offen sind, relativ kurz ist, sowie einen Zyklus umfasst, bei dem eine
solche Dauer relativ lang ist.
12. Vorrichtung nach irgendeinem der Ansprüche 8 bis 11, bei dem der Kanal (1) als eine
Rohrverzweigung ausgebildet ist, die einen Kanal und wenigstens eine Öffnung (FO1,
F02, F03) aufweist, die darin mündet.
13. Vorrichtung nach Anspruch 12, bei der es wenigstens zwei Öffnungen (FO1, FO2) gibt.
1. Procédé de nettoyage d'une conduite comprenant :
a) la fourniture d'un écoulement d'un premier fluide, tel que l'eau, à travers un
conduit (1), au moins un orifice (FO1, F02, F03) s'ouvrant dans le conduit (1), de
manière telle qu'un écoulement d'un second fluide passe à travers l'orifice (FO1,
FO2, FO3) dans le premier fluide à une vitesse spécifiée par rapport à la vitesse
d'écoulement du premier fluide, pour fournir un écoulement d'une solution du premier
fluide dans le second fluide à une concentration prédéterminée ;
b) la fourniture de l'écoulement de la solution à travers la conduite ;
c) l'autorisation d'une telle solution à rester dans la conduite sur un temps prédéterminé
;
d) la fourniture d'une écoulement d'un premier fluide à travers le conduit (1) ; et
e) la fourniture d'un écoulement du premier fluide à travers le conduit (1) et la
conduite pour rincer la solution de la conduite ;
caractérisé en ce que
i) dans l'étape (c), la solution reste statique dans la conduite ; et
ii) dans l'étape (d), l'écoulement du premier fluide est fourni à travers le conduit
tout en prévenant le second fluide de passer à travers l'orifice (FO1, FO2, FO3) dans
le conduit (1), rinçant ainsi la solution du conduit (1) sans rincer la conduite.
2. Procédé selon la revendication 1, caractérisé en ce que les premier et second fluides sont liquides.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le premier fluide est l'eau et en ce que le second fluide est un détergent.
4. Procédé selon la revendication 3, caractérisé en ce que la conduite est une ligne de distribution de bière.
5. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'il y a au moins deux orifices (FO1, FO2) s'ouvrant dans le conduit (1), de manière
telle que la solution est à des concentrations prédéterminées en fonction de l'orifice
(FO1, FO2) à travers lequel le second fluide passe.
6. Procédé selon l'une des revendications précédentes, caractérisé en ce que le second fluide passe, soit à travers un seul orifice (FO1, FO2, FO3), soit à travers
plus d'un orifice (FO1, FO2, FO3) en fonction d'une pluralité de programmes ou cycles
manuellement sélectionnés sur des moyens de commande.
7. Procédé selon la revendication 6, caractérisé en ce que la période de temps totale durant laquelle le second fluide passe à travers le ou
les orifices (FO1, FO2, FO3) dépend du programme qui est sélectionné sur les moyens
de commande.
8. Dispositif pour nettoyer une conduite, comprenant
(a) un conduit (1) pour la connexion à une alimentation d'un premier fluide et à la
conduite ;
(b) au moins un orifice (FO1, FO2, FO3) s'ouvrant dans le conduit (1) et pour la connexion
à une alimentation d'un second fluide, et
(c) des moyens (FV1, FV2, FV3) pour fermer une connexion entre l'orifice (FO1, FO2,
FO3) et l'alimentation du second fluide ;
caractérisé en ce qu'il est de plus fourni
(d) des moyens (V7) pour ouvrir et fermer une connexion entre le conduit (1) et la
conduite, où le conduit (1) peut être rincé par le premier fluide, sans second fluide,
sans rinçage de la conduite par le premier fluide.
9. Dispositif selon la revendication 8, caractérisé en ce qu'il y a au moins deux orifices (FO1, FO2) s'ouvrant dans le conduit (1) et pour la
connexion à l'alimentation du second fluide.
10. Dispositif selon la revendication 9, comprenant de plus des moyens de commande (CU)
sur lesquels une pluralité de programmes ou de cycles peut être manuellement sélectionnée,
les programmes ou cycles incluant un premier cycle de nettoyage où seulement un premier
orifice (FO1) est ouvert et un second cycle de nettoyage où un premier orifice (FO1)
et un second orifice (FO2) sont tous deux ouverts.
11. Dispositif selon la revendication 10, caractérisé en ce que les programmes ou cycles incluent un cycle où la période de temps totale sur laquelle
le (FO1) ou les orifice(s) (FO1, FO2) sont ouverts est relativement courte et un cycle
où une telle durée est relativement longue.
12. Dispositif selon l'une des revendications 8 à 11, caractérisé en ce que le conduit (1) est composé d'un collecteur ayant un canal et au moins deux orifices
(FO1, FO2, FO3) s'ouvrant dedans.
13. Dispositif selon la revendication 12, caractérisé en ce qu'il y a au moins deux orifices (FO1, FO2).