ES2308082T3 - PROVISION OF VALVES FOR MIXING A PAINT OF VARIOUS COMPONENTS AND CORRESPONDING OPERATION PROCEDURE. - Google Patents

Abstract

The valve arrangement (2) for the producing of a multi-component lacquer has a base lacquer feed line (3), an accelerator feed line (9), and an output line (5) for the delivery of the mixed lacquer. A controllable shut-off valve (15) is installed downstream behind a valve (10) installed in the accelerator feed line. A first flushing medium feed line (19) runs into a pipe section downstream of the shut-off valve, and a second flushing medium line (24) runs into a pipe section between the accelerator valve and shut-of valve. Independent claims are also included for the following: (A) a rotating sprayer with an integrated valve arrangement; (B) a lacquering machine and especially a robot, incorporating a rotating sprayer; and (C) an operating method for a valve arrangement for the forming of a multi-component lacquer, and especially a water based lacquer.

Description

Provision of valves for mixing one multi-component paint and operating procedure correspondent.

The present invention relates to a arrangement of valves for the production of a paint of several components, in particular in the form of a mixer for the production of a multi-component water paint, according to the preamble of claim 1 as well as a method of operation for an arrangement of valves of this type according to the preamble of claim 12.

In the painting technique it is known to use multi-component paints for painting parts, such such as auto body parts, which are mixed from a main painting and a hardener In multi-component paints of this type the main paint can be optionally based on solvent or water-based, offering aqueous paints of Several components better compatibility with the environment. In both cases, the hardener is however conventional and is based on a solvent base.

From WO 97/00731 a known arrangement of valves for mixing a paint of several components of this type which may be arranged, for example, on the arm of a painting robot and that supplies the paint of several components to a sprayer, which is also subject to the arm of a painted robot. This valve arrangement known features a hardener feed and a main paint feed, which lead to a common output conduit, being arranged in the power supply of hardener and in the main paint feed in each case a controllable valve In addition, the arrangement of valves known presents a washing line which leads to also, through a wash valve, in the conduction of common output.

During the operation of painting the two controllable valves of the hardener feed and the main paint feed are open while for on the contrary the washing agent valve is closed, so that the main paint is mixed with the hardener in the common output conduction and form several paint components.

For washing and during a color change on the contrary they close the two controllable valves of the hardener feed and paint feed main, while the wash valve is opened, after which is introduced an aqueous washing agent in the arrangement of valves and cleans the common output conduit as well as the conduction sections of the hardener feed and the main paint feed found, stream below, behind the hardener valve or the valve main painting During this washing process is introduced alternatively aqueous washing agent and pulsed air.

In this case, the fact that in the case of multi-component paints with a main paint based on a water base, you must use a washing agent aqueous, in order to obtain a satisfactory washing effect. This is problematic because an aqueous washing agent reacts chemically with the conventional hardener that is based based on solvent (eg isocyanate), which can lead to hardening. In the extreme case this chemical reaction between the conventional hardener and aqueous washing agent can lead to the valve arranged in the hardener feed as well as other valves and sections of conduction of the valve arrangement, which is linked with a irreversible damage

Another problem of valve arrangements known is derived from the use of the so-called pulsed air, the which is insufflated for cleaning in the valve arrangement. This is problematic because the pulsed air also contains air humidity, which reacts chemically with the hardener based on solvent, which can also lead to a hardening and correspondingly irreversible damage.

In addition, it can also penetrate the arrangement of air humidity valves from the environment (e.g. from the painted cabin, through the nozzle or through a hose) and trigger the chemical reaction described above with the solvent based hardener what can driving, particularly during a prolonged interruption of operation, to irreversible damage.

In addition, document DE 1 900 518 A discloses a spray device for liquid synthetic resins in the which is arranged a check valve in a feed of catalyst, behind a catalyst valve.

Thanks to document DE 83 10 862 U1 it is known also a mixing and washing device that makes possible a return of the paint supplied through a conduction of return.

Thanks to US Patent No. 4,993,353 it is known a system for changing the color of a color sprayer, intending to operate two color change devices one after another.

US Patent No. 4,703,894 also discloses a two component mixer which makes it possible to supply with a mixture of two components to a spray gun away from the color collector and hardener tank.

Thanks to document GB 2 367 771 A it is known also a lining device which is attached to an arm of robot

In addition, document DE 102 23 498 A1 gives know a procedure and a system for the supply of color of an electrostatic coating installation with a unit of modular potential separation which contains at least two color storage containers as well as in each case a container for a washing agent and for a material to be remove.

The publications mentioned last are refer, however, to generic objects or are affected by the same drawbacks as the prior art cited initially.

Finally, thanks to US Patent No. 5,126,173, an arrangement of valves for the production of a multi-component paint is known, in which a main paint with a hardener is mixed in a mixer. The main paint is supplied, in this case, to the mixer through a main paint feed and a main paint valve, while the hardener is supplied to the mixer through a hardener feed and a hardener valve. In addition, the washing agent ducts flow into the mixer at the same time, which make washing possible. From the mixer an outlet conduit leads to an application apparatus, which applies the paint of several components. Here again the fact that the washing agent may come into contact with the hardener valve becomes problematic, which can lead to the above problems of a reaction of mixing of the hardener with moisture of the washing liquid in base
of water.

The invention therefore poses the problem. of improving the known valve arrangement described by principle to prevent a reaction as widely as possible hardener chemistry based on solvent based with moisture of the aqueous washing agent, the pulsed air or the environment.

This problem is solved, starting from the known valve arrangement described above, according to the preamble of claim 1, by means of the features of the characterizing part of claim 1 and - with respect to a corresponding operating procedure - by means of characteristics of claim 12.

The invention includes technical education General sealing the hardener valve, during washing with an aqueous washing agent and / or during air insufflation pulsed containing moisture and / or during an interruption prolonged operation, by means of a shut-off valve, with in order to prevent contact between hardener and moisture contained in aqueous washing agent, pulsed air or air of the environment. This sealing prevents advantageous than the solvent-based hardener (e.g. isocyanate) hardens due to contact with moisture, which It would lead to irreversible damage.

In accordance with the invention it is arranged by it, downstream, behind the hardener valve, a controllable shut-off valve, in order to seal the valve of hardener, the shut-off valve being arranged in the hardener feed. The concept of feeding hardener used here comprises at the same time preferably the entire driving zone for the supply of hardener upstream of the mouth of the main paint feed. Hardener feed It is therefore not limited to the driving area, located upstream of the shut-off valve or upstream of the hardener valve.

The controllability concept of the valve closure used in the context of the invention means preferably the shut-off valve can be adjusted regardless of the pressure on the inlet side and / or on the output side, while on the contrary for example a check valve automatically opens or closes in correspondence with the pressure on the inlet or outlet side.

The shut-off valve can be controlled preferably by pressurized air, although the invention does not is limited to a control by pressurized air of the valve closing. Rather it is possible to control the shut-off valve electrically, hydraulically or otherwise.

In addition, the arrangement of valves according to the invention preferably has an agent feed of washing, which leads to the output line, current below, behind the shut-off valve. In case of use of the valve arrangement according to the invention for mixing a multi-component water paint is supplied, through of this feed of washing agent, a washing agent aqueous, the shut-off valve being closed during the process of washing, in order to prevent contact of the washing agent aqueous with hardener. In addition, it can also be insufflated, to through this feed of washing agent, pulsed air for the cleaning of the valve arrangement, the valve being closure also closed during insufflation, to prevent a contact between the humidity of the air contained in the pulsed air and the hardener. To blow the pulsed air, it can be provided alternatively also a separate pulsed air supply, which leads to the output line, downstream, behind the shut-off valve.

There is, however, alternatively also the possibility of supplying the aqueous washing agent through The main paint feed. Here you can supply the aqueous washing agent from a color changer connected to before, for example during a color change, through the main paint feed. Here you can enter through the main paint feed, alternatively, aqueous washing agent and pulsed air.

In addition, the arrangement of valves according to the invention preferably presents another agent feed of washing, which leads to a conduction section located between the hardener valve and the shut-off valve. During the use of the valve arrangement according to the invention for the Mixing a water paint can be supplied, through this feed of washing agent, a washing agent additional, which is based on solvent and / or adjusted to the hardener and therefore does not react with the hardener. This Additional washing agent can be used for, within the framework of a washing process, remove moisture from the disposal of valves

However, it is also possible that the section duct located between the hardener valve and the valve of closing be flooded with the washing agent based on solvent This is advantageous, in particular, in the case of a prolonged interruption of operation, given that the agent washing containing solvent then prevents as a means of closure that the humidity of the air react slowly with the hardener

Through this agent feed of additional washing can also blow air pulsed into the valve arrangement according to the invention. However it is possible also alternatively that for the insufflation of the pulsed air an additional pulsed air supply is provided, which flows into the conduction section between the valve hardener and shut-off valve. During the use of a conventional hardener (eg isocyanate) does not blow without however air pulsed through the agent feed washing, since the hardener could react chemically with the moisture contained in the pulsed air, which can lead to a hardener hardening.

Between the hardener valve and the valve closure is preferably arranged a chamber, which can be flooded during an interruption the operation with agent of washing containing solvent, so that during operation interruption there is constantly washing agent containing solvent as a closing means in the valve hardener, which prevents hardening of the hardener The chamber between the hardener valve and the shut-off valve may be formed, for example, by a hose or a hose section.

During normal painting operation, opens, therefore, the shut-off valve, so that the hardener can be accessed through the hardener valve also open and the shut-off valve to the outlet line common, to be able to mix there with the main paint to give Multi-component paint.

In case of shorter waiting times you can take place then a normal washing process, in which introduce aqueous washing agent or pulsed air, downstream, behind the shut-off valve, the valve being closed hardener, main paint valve and shut-off valve. With the shut-off valve closed, it is prevented at the same time as the aqueous washing agent comes into contact with the hardener.

In case of a disruption of operation long takes place, preferably, after this washing with the agent aqueous washing, an additional washing process, in order to prevent lumps from forming, which could form because of the chemical reaction between the aqueous washing agent and the hardener. For this, a washing agent is preferably introduced which contains conventional solvent in the valve arrangement, taking place preferably between the valve hardener and shut-off valve. At the same time, the valve hardener and main paint valve are closed, while the shut-off valve is open. On the one hand, it expel hardener remains by washing this washing, of so that further hardening is prevented during interruption of operation On the other, by this wash, residual moisture is removed, which also acts against of a hardener of the hardener. After this washing process additionally the valve is then closed preferably closure, so that the conduction zone of the valve hardener and shut-off valve is, during interruption of operation, preferably filled with the washing agent containing solvent, in order to prevent the formation of lumps during operation interruption. At the same time the solvent-containing washing agent acts as a means of closure, which prevents hardening of the hardener.

The arrangement of valves according to the invention therefore, it preferably has two feeds of washing agent, supplying one of the agent feeds washing preferably aqueous washing agent and emptying preferably in the output line, downstream, behind of the shut-off valve while the other supply of washing agent preferably supplies a washing agent, without water, which contains solvent, and preferably flows into the conduction section between hardener valve and valve of closing.

In addition, the arrangement of valves according to the invention may also have a return line, the which branches off the main paint feed and does possible, during a color change, a compression and a Release by washing of the main paint feed. In this context, it should be mentioned that in the paint feed main can be connected, upstream, before the valve arrangement, a color changer, which you choose, Among several main paintings available, the main painting of the desired color and supplies it to the valve arrangement.

In addition, it can be connected to the power of hardener also a hardener changer which supplies one of several different hardeners.

Preferably the hardener valve, the main paint valve and wash agent valves they are integrated in the valve arrangement according to the invention and They are an integral part of it. The invention comprises, without However, also some embodiments of such type that in they these valves are made as separate components and are previously connected to the valve arrangement according to the invention.

In addition, it should be mentioned that the invention is not limited to the valve arrangement described above but also includes an operating procedure corresponding, in which the common output conduit can be wash for multi-component paint separately from the hardener feed.

Preferably, the conduction sections of hardener feeding, on the one hand, and driving output and / or of the main paint feed, on the other, that they can be washed separately from each other, they are washed time with different washing agents. To do this, it is used to the washing of the output line and / or the power supply of main paint preferably an aqueous washing agent, in If the main paint is based on water. For washing the hardener feed and / or flood of the conduction section located between the hardener valve and the shut-off valve is used, on the contrary, preferably a washing agent, without water, containing solvent, in order to prevent a chemical reaction between the base based hardener of solvent (eg isocyanate) and the washing agent, since This could lead to irreversible damage.

Other advantageous improvements of the invention are characterized in the dependent claims or are explained in more detail below, from the figures, along with the description of the examples of forms of preferred embodiment. In the figures:

Fig. 1a shows a representation schematic of a valve arrangement according to the invention for the production of a multi-component water paint,

Fig. 1b shows a sectional view simplified of a rotation sprayer with the provision of valves according to Fig. 1a,

Fig. 2a shows a representation schematic of an alternative embodiment of a arrangement of valves according to the invention, as well as

Fig. 2b shows a sectional view cross section of the valve arrangement according to Fig. 2nd.

The cross-sectional view of Fig. 1b shows a rotation sprayer 1, which is structured in widely conventional way, so that then you don't Make any detailed description of the rotation sprayer 1 and only the essential characteristics for the invention. The front of the rotation sprayer 1 is represented by simplicity, so as not to divert attention from the essential details for the invention. With respect to Details of the conventional structure of the rotation sprayer 1 refers, by way of example, to document DE 93 21 294 U1 and document DE 43 06 800 A1, the content of which must be added in all its Extension to the present description.

The rotation sprayer 1 is used for coating parts, such as body parts  of motor vehicles, with several water-based paint components which consists of a hardener H and a paint main SL, the hardener H being mixed with the paint main SL in a valve arrangement 2 represented schematically in Fig. 1a.

For the supply of the main paint SL, valve arrangement 2 has a paint feed main 3, which part of the front surface of the valve arrangement 2, which is located on the left in the drawing, and which flows through a paint valve Main 4 controllable, in a common 5 output conduit for the hardener H and the main paint SL, comprising the valve of main painting 4 of an actor 6 operated by air to pressure and a valve needle 7 supported movable. In its lower stop position, valve needle 7 blocks the passage from hardener feed 3 to output line 5 common, while the passage opens for the elevated position of the valve needle 7. The actuator of the valve 6 actor hardener 4 takes place at the same time through a pressurized air control line 8 which also starts of the front surface of the valve arrangement 2 which is found on the left in the drawing and ending in actor 6.

For the supply of hardener H, the valve arrangement 2 presents the corresponding power of hardener 9, which also starts from the front surface of the valve arrangement 2 located on the left in the drawing and which flows through a hardener valve 10 controllable, in a camera 11 or in a driving volume corresponding, consisting of hardener valve 10 of an actor 12 pneumatically operated and a valve needle 13, actuated by actor 12 and supported scrollable. In its top position more lower the valve needle block the passage from the power supply hardener 9 towards the chamber 11, so that it cannot penetrate hardener H some in chamber 11. In its raised position, the valve needle 13 opens the passage from the hardener feed 9 to chamber 11, so that the hardener H can be accessed from hardener feed 9 inside the chamber 11. The control of the actor 12 of the valve of hardener 10 takes place at the same time pneumatically to through a pressurized air control line 14 which also part of the front surface of the arrangement of valves 2 located on the left in the drawing and ending in the actor 12.

The chamber 11 located in the arrangement of valves 2 is connected, through a shut-off valve 15 controllable, with common 5 output conduction, consisting of shut-off valve 15 essentially of an actor 16 and a needle of valve 17, actuated by actor 16 and supported movable. In the stop position, located on the right in the drawing. the needle of valve 17 close the passage from chamber 11 towards the conduction of common output 5, so that no hardener H can enter from chamber 11 to exit 5 driving. In position located to the left in the drawing, the valve needle 17 opens by on the contrary the passage from the camera 11 towards the conduction of output 5, so that the hardener H can arrive from the chamber 11 to the output conduit 5, to mix there with the main paint SL to give the water paint several components. The control of the actor 16 of the shut-off valve 15 takes place by driving air pressure control 18, which part of the front surface of the valve arrangement 2 located on the left in the drawing and which is directed towards the actor 16.

For the washing of the outlet pipe 5 common, valve arrangement 2 has a power supply of washing agent 19, which part of the front surface of the valve arrangement 2 located on the left in the drawing and flows, through a washing agent valve 20, into the outlet line 5, consisting of the washing agent valve 20 of an actor 21 that can be operated pneumatically and a needle of valve 22, which is actuated by actor 21 and is arranged movable in valve arrangement 2. In its position of stop, located above in the drawing, the valve needle 22 closes the step from the washing agent feed 19 towards the common 5 output conduit, so that no washing takes place any. In a position located below in the drawing the needle of valve 22 of the washing agent valve 20 opens by the opposite the passage from the washing agent feed 19 towards the common 5 output conduit, so that the Rotation sprayer 1 can be washed with a washing agent V1 that contains water, which is supplied through the washing agent feed 19. The actor's control 21 of the washing agent valve 20 takes place pneumatically through of a pressurized air control line 23, which starts from the front surface of the valve arrangement 2 located at the left in the drawing and is directed towards the actor 21.

The use of a washing agent that Contains water makes sense while using a paint to the water of several components since the main paint used at the same time is also based on water.

In addition, valve arrangement 2 presents another wash agent feed 24, which part of the front surface of the valve arrangement 2 located at the left in the drawing and flows into chamber 11, through a washing agent valve 25, the agent valve consisting of washing 25 of a pneumatically actuated actor 26 and a needle of valve 27 mechanically actuated by actor 26 and supported movable in valve arrangement 2. In a position located in the drawing above the valve needle 27 of the agent valve wash 25 closes at the same time the passage from the feeding of washing agent 24 towards the chamber 11, so that it is not supplies washing agent V2. In a position located below in the drawing, the valve needle 27 of the washing agent valve 25 on the contrary it opens the step from the agent feed of washing 24 towards chamber 11, so that agent can enter washing V2 from the washing agent feed 24 inside of camera 11. The control of actor 26 takes place at the same time pneumatically through an air control line at pressure 28, which part of the front surface of the valve arrangement 2 located on the left in the drawing and is led to the actor 26 of the washing agent valve 25.

In addition, rotation sprayer 1 features still a conventional main valve 29, which is arranged in the output 5 conduit and it controls the paint discharge to the water of several components, the main valve 29 consisting of new from a pneumatically actuated 30 actor and a valve needle 31 that mechanically actuates actor 30 and is supported movable in the rotation sprayer 1. The actor's control 30 takes place at the same time pneumatically by another pressurized air conduction 32, which part of the surface front of the valve arrangement 2 located on the left in the drawing and that is led to the valve actor 30 main 29.

It is described below, from the schematic representation of Fig. 1a, the way of operation  of the valve arrangement 2 according to the invention.

In normal painting operation the two wash valves 20, 25 are closed, so you don't have some washing place.

The hardener valve 10 and the valve closure 15 are on the contrary open during operation of normal painted, so that the hardener H accesses, through of hardener valve 10, chamber 11 and valve closure 15 open, to the exit conduit 5, in which the hardener H is mixed with the main paint SL, which accesses through the main paint valve 4 also open to the output conduit 5. Multi-component water paint that formed in this way is then applied by the sprayer of rotation 1 in correspondence with the valve position of the main valve 29.

In case of an interruption of operation Brief of the rotation sprayer 1 are closed on the contrary hardener valve 10 and main paint valve 4, since no more hardener H or more main paint is needed SL.

In case of a disruption of operation longer of the rotation sprayer, for example during the end week, or after the application period specific to the material takes place, on the contrary, a washing of several phases of the entire rotation sprayer 1 with the valve arrangement 2.

As in the case of an interruption Brief operation of rotation sprayer 1 close firstly the hardener valve 10 and the paint valve main 4, so that no more components of the painting H, SL.

Then the agent valve is opened wash 20, while the shut-off valve 15 and the other valve of washing agent 25 remain closed. Through the washing agent feed 19 are then supplied alternatively pulsed air PL and a washing agent V1 that it contains water, which access the common 5 outlet pipe and clean this as well as the entire rotation sprayer 1 of remnants of the 2-component paint.

After this first washing process, the washing agent valve 20, after which the wash agent valve 25 and shut-off valve 15. Through a washing agent feed 24 is then supplied with a conventional washing agent V2 without water containing solvent, which penetrates into chamber 11 and arrives, through the valve of closure 15 open, to the output conduit 5, until the Rotator sprayer 1 is full or has been washed with agent V2 wash without water containing solvent. Then you close the shut-off valve 15 and the agent valve wash 25, preventing washing agent V2 without water containing solvent contained in chamber 11, which remains of agent washing agent wash V1 react chemically with the hardener H in the rotation sprayer 1 or in the arrangement of valves 2, which in the extreme case could lead to a clogging of hardener valve 10 and others valves

The exemplary embodiment shown in Figures 2a and 2b it coincides widely with the example of form of embodiment described above and represented in the Figures 1a and 1b, so that to avoid repetitions, refer to this description above and then used to corresponding components the same reference signs.

A particularity of this example in the form of realization is that of the main paint feed 3 a conduit is derived through a return valve 33 return 34, the return valve 33 again consisting of a pneumatically actuated actor 35 and a valve needle 36, operated by actor 35 and supported scrollable in the layout of valves 2. In the stop position, which is on the right  in the drawing, the valve needle 36 of the return valve 33 closes the passage from the main paint feed 3 to the return conduction 34, so that it is not carried back main paint SL some. In a position on the left in the drawing, the valve needle 36 of the return valve 33 on the contrary it opens the step from the paint feed main 3 towards return line 34, so that it has place in return of main painting SL. The return valve 33 for the main paint SL serves to boost and release by Wash the main paint feed 3, in case of use of several different SL main paints with the same hardener H. The different main paints SL are then centrally connected to a color changer previously connected and not represented and are driven, depending on the needs, towards the rotation sprayer 1. The control of the actor 35 of the return valve 34 takes place again pneumatically through an air duct to pressure 37.

The invention is not limited to the examples of Preferred embodiments described above. In fact, it is imaginable a large number of variants and modifications the which also use the idea of the invention and are included, therefore, in the scope of protection.

Claims (19)

1. Valve arrangement (2) for production of a multi-component paint, in particular of a two component water paint, with

to)

a main paint feed (3) for the supply of a main paint (SL),

b)

a hardener feed (9) for the supply of a hardener (H),

C)

a hardener valve (10) arranged in the feed of hardener (9),

d)

an outlet line (5) for the discharge of the mixed multi-component paint from the main paint (SL) and the hardener (H), leading to the main paint feed (3) and the hardener feed (9) in the output line (5), characterized in that it presents

and)

a control valve (15) controllable, which is arranged in the hardener feed (9), upstream, behind the hardener valve (10).

2. Valve arrangement (2) according to claim 1, characterized in that a first feed of washing agent (19) flows into a conduction section, upstream, behind the shut-off valve (15). 3. Valve arrangement (2) according to claim 2, characterized in that the first feed of washing agent (19) contains a washing agent (V1) containing water. 4. Valve arrangement (2) according to one of the preceding claims, characterized in that a second feed of washing agent (24) flows into a conduction section located between the hardener valve (10) and the shut-off valve (15) . 5. Valve arrangement (2) according to claim 4, characterized in that the second washing agent feed (24) contains a washing agent (V2) without water. 6. Valve arrangement (2) according to one of the preceding claims, characterized in that a chamber (11) for flooding with washing agent (V2) is arranged between the hardener valve (14) and the shut-off valve (15). without water. 7. Valve arrangement according to one of claims 2 to 6, characterized in that a controllable first wash agent valve (20) is arranged in the first feed of washing agent (19) and / or in the second feed of washing agent Washing (24) a second controllable washing agent valve (25) is arranged. 8. Valve arrangement (2) according to one of the preceding claims, characterized in that a return line (34) is derived from the main paint supply (3) upstream, before the main paint valve (4). , a controllable return valve (33) being arranged in the return line (34). 9. Valve arrangement (2) according to one of the preceding claims, characterized in that the main paint supply (3) flows into the outlet line (5), downstream, behind the shut-off valve (15). 10. Rotation sprayer (1) with a valve arrangement (2) integrated according to one of the previous claims. 11. Painting machine, in particular a robot painted, with a rotation sprayer according to claim 10. 12. Operating procedure for a valve arrangement (2) for the formation of a paint several components, in particular a two-water paint components, with the following stages:

to)

supply a main paint (SL) through a main paint feed (3),

b)

supply a hardener (H) through of a hardener feed (9) and a hardener valve (10) arranged in the hardener feed (9),

C)

mix the main paint (SL) with the hardener (H) to give several paint components,

d)

conduct the painting of several components through an outlet line (5), characterized in that

and)

the hardener feed (9) can be closed, downstream, behind the hardener valve (10) by means of a valve controllable closure (15) arranged in the hardener feed (9), in order to prevent a breakdown or damage of the valve hardener (10).

13. Operating method according to claim 12, characterized in that the shut-off valve (15) is closed when a coating operation is interrupted. 14. Operating method according to claim 12 or 13, characterized in that the shut-off valve (15) closes when washing takes place. 15. Operating method according to claim 14, characterized in that a conduction section located between the hardener valve (9) and the shut-off valve (10) is washed separately from a conduction section located downstream behind the shut-off valve (15). 16. Operating method according to claim 15, characterized in that the conduction section located upstream of the shut-off valve (15) is washed with a washing agent (V2) without water, while on the contrary the conduction section located , downstream, behind the shut-off valve (15) is washed with a washing agent (V1) containing water. 17. Operating method according to one of claims 14 to 16, characterized in that downstream, behind the hardener valve (14) and, upstream, before the shut-off valve (15), a chamber (11) is arranged , the chamber (11) being filled with a washing agent (V1) without water, when the painting operation is interrupted. 18. Operating procedure according to one of claims 11 to 17, characterized in that it has the following steps for washing the valve arrangement:

-

to wash the driving section downstream behind the shut-off valve (15), with the washing agent (V1) containing water, with the shut-off valve (15) closed,

-

to then wash the current located conduction section above, before the shut-off valve (15), with the washing agent (V2) without water, with the shut-off valve (15) open.

19. Operating procedure according to claim 18, characterized in that it has the following steps:

-

fill in the conduction section located between the hardener valve (10) and the shut-off valve (15) with the washing agent (V2) without Water,

-

close the shut-off valve (15) during an interruption of the operation, after the driving section located between the hardener valve (10) and the shut-off valve (15) has been flooded with the washing agent (V2) without water.