DE102019133827A1 - Device and method for switching a high pressure suspension - Google Patents

Abstract

The invention relates to a device for switching a high-pressure suspension, in particular for switching a high-pressure fluid flow mixed with solid particles on and off, comprising a fluid reservoir (1), a high-pressure generator (2) and a nozzle (11), the The device has a main flow path, a suspension generation and a secondary flow path in such a way that a counterpressure can be generated via the secondary flow path (13), which opens into the main flow path (12) behind the suspension generation (5) in the main flow direction, which has a pressure difference to the start or Switching off the high-pressure suspension via a first valve (6) reduces or completely eliminates it and that - the main flow path (12) via the first valve (6), which is located in the main flow path (12) in the flow direction behind the suspension generation (5) and before Confluence of the secondary flow path (13) and a second valve (8), which is in the main flow gsweg (12) in the flow direction in front of the suspension generation (5), can be opened or closed and that - the back pressure can be reduced by separating the bypass flow path (13) from the high pressure generation via a switching valve (7). The invention also relates to a Associated method for switching on and off a high-pressure fluid flow mixed with solid particles.

Description

The present invention relates to a device and a method for switching a high-pressure suspension, in particular for completely switching on and off a high-pressure fluid flow mixed with solid particles.

High-pressure liquid jets with the addition of solid particles are used according to the general and current state of the art for cleaning, roughening, removing or cutting (Awiszus, Birgit; Bast, Jürgen; Dürr, Holger (2016): Fundamentals of manufacturing technology. 6th, updated edition .). Water is often used as the fluid medium. Depending on the application, a wide variety of solid particles can be added to the fluid. A common method for admixing these solid particles is the injection method. Here, a high-speed liquid jet is formed, which accelerates fine-grained solid particles and a surrounding gas, mostly ambient air, provided by the generation of negative pressure in a mixing area. Before the solid particles are added, the liquid under high pressure can easily be switched on and off with the aid of a needle valve. As a result, the machining process is interrupted within a very short time.

If the solid particles are mixed into the fluid before the high-speed jet is generated, then no surrounding gas is advantageously added to the solid-liquid mixture and there are significantly lower energy losses when the solid particles are accelerated. This is called the suspension jet process. The fact that the solid particles in the mixture can impair the functionality of valve components is particularly problematic when handling a high-pressure solid-liquid suspension. If the particles are particularly hard, they can cause wear and tear on valves and flow paths, leading to the failure of the individual components to function properly. These particles can also block valves and thus inhibit switching operations. Both mechanisms endanger the safe handling of the overall system.

In the publication DE 10 2014 100 839 B4 describes a water abrasive suspension cutter and a method for controlling it. In the structure described, a bypass line enables switching valves located between the generation of the suspension and a cutting nozzle to flow through in the opposite direction of flow as in the cutting operation, thereby freeing the valves from abrasive particles. In one embodiment, further liquid drains in the high-pressure system are described which release water by opening upstream valves in order to avoid excess pressure when flushing backwards. In a further embodiment, these pressure peaks are detected by a pressure sensor and the high pressure generation is readjusted if necessary. It is not intended to maintain the complete system pressure in the suspension mixing unit.

The publication WO 2007/134 702 A1 describes a way to switch a high-pressure suspension using a wear-resistant ball valve. An additional line is provided for flushing this ball valve, which acts on the valve body and specially provided dead spaces between the valve ball and valve seat when switching with water. The complete switching off of the fluid jet is not provided according to this invention.

One possibility for producing a high-pressure suspension with valve technology in the high-pressure area is in the publication EP 2 308 646 A1 described. An adapted valve geometry is described, which is absolutely necessary for the provision of a high-pressure suspension by a diaphragm pump. A special, hemispherical valve seat made of tungsten carbide is intended to help compensate for the wear and tear of the abrasive particles in the high-pressure suspension on the sealing surface of the valve seat. The sealing surfaces themselves are exposed to the abrasive effect of the solid particles flowing past. Because of the high flow speed of the abrasive suspension when the valves are opened, they are mainly exposed to wear.

The translation of the European patent specification DE 698 16 025 T2 describes a liquid jet for jet processing. When the jet pump actuation is started and a reverse flow is induced in the abrasive reservoir circuit, a valve is actuated after a short delay to allow the reverse flow to remove abrasive particles from the passageways. The actuation of the switching means from one mode to the other causes the jet to comprise either carrier fluid only or carrier fluid plus abrasive particles, the change taking place essentially immediately and completely.

The publication WO 2012/065 580 A1 includes a water-abrasive suspension jet cutting system. Before the beginning of the cutting process, a valve in the connection between the outlet line and the main flow path is closed, so that a passage of suspension through this connection into the main flow path is prevented and the suspension only enters the main flow path near the cutting nozzle at the mixing point described above. When the system is depressurized, the valve is opened to remove abrasive residues in the outlet line by pure water flow.

The disclosure WO 2016/020 275 A1 and the publication belonging to the patent family DE 10 2014 111 043 A1 describes an apparatus and a method for blasting suspension onto workpieces. This technology aims to introduce high amounts of abrasive and to avoid blowing compressed air.

In the published application DE 10 2011 055 772 A1 A device and a method for wet blasting of blasting material are described. The aim is that the device enables the most uniform possible spray pattern on the workpiece surface with economical or inexpensive operation. For this purpose, however, the blowing in of compressed air is provided.

The publication DE 10 2011 055 770 A1 describes a method, abrasive and device for wet blasting using special abrasive particles that are blown in under compressed air.

The object of the invention is to develop a device and a method for switching a high-pressure suspension, by means of which suspensions under high pressure, consisting of a fluid and a solid particle phase, can be switched on and off within a very short time, without this the suspension generation in the system is relieved of pressure or significantly reduced.

This object is achieved with the characterizing features of the first and seventh claims.

Advantageous refinements result from the subclaims.

• - ein Gegendruck über den Nebenströmungsweg, welcher in Hauptströmungsrichtung hinter der Suspensionserzeugung in den Hauptströmungsweg mündet, erzeugbar ist, der eine Druckdifferenz zum An- oder Abschalten der Hochdruck-Suspension über ein erstes Ventil verringert oder vollständig aufhebt und dass
• - der Hauptströmungsweg über das erste Ventil, welches sich im Hauptströmungsweg in Strömungsrichtung hinter der Suspensionserzeugung und vor der Einmündung des Nebenströmungsweges befindet sowie über ein zweites Ventil, welches sich im Hauptströmungsweg in Strömungsrichtung vor der Suspensionserzeugung befindet, geöffnet oder geschlossen werden kann und dass
• - der Gegendruck über das Trennen des Nebenströmungsweges von der Hochdruckerzeugung über ein Schaltventil abbaubar ist.

The device relates to a device for switching a high-pressure suspension, in particular for switching on and off a high-pressure fluid flow mixed with solid particles, comprising a fluid reservoir, high-pressure generation and a nozzle. The device has a main flow path, a suspension generation and a secondary flow path in such a way that

• - A back pressure can be generated via the secondary flow path, which opens into the main flow path in the main flow direction behind the suspension generation, which reduces or completely eliminates a pressure difference for switching the high-pressure suspension on or off via a first valve and that
• - The main flow path via the first valve, which is located in the main flow path in the flow direction behind the suspension generation and before the confluence of the secondary flow path, and via a second valve, which is located in the main flow path in the flow direction before the suspension generation, and that
• - The back pressure can be reduced by separating the secondary flow path from the high pressure generation via a switching valve.

In an advantageous embodiment, the first wear-resistant valve is designed in the form of a disk slide valve, the disk slide valve having at least three disks such that the disk slide valve by means of vertical movement of at least one wear-resistant disk arranged therein, sealingly arranged between the at least two further, fixed, wear-resistant disks is closable.
The wear-resistant disks advantageously have through holes adapted to the flow path.
In an alternative embodiment, the first wear-resistant valve is designed in the form of a ball valve.

The secondary flow path preferably has a non-return valve such that the entry of solid particles into the secondary flow path from the main flow path can be prevented and / or that the main flow path has a non-return valve, the non-return valve ensuring that solid particles of the suspension cannot reach the high-pressure generation and the hydraulic valve.

According to the device, after the confluence of the secondary flow path and the main flow path, a nozzle for cleaning, roughening, removing or cutting an undefined geometric design is arranged.

• - in einem ersten Schritt ein Gegendruck über einen Nebenströmungsweg, welcher in Hauptströmungsrichtung hinter einer Suspensionserzeugung in einen Hauptströmungsweg mündet, erzeugt wird, der die Druckdifferenz zum Anschalten der Hochdruck-Suspension über ein erstes Ventil verringert oder vollständig aufhebt und dass
• - in einem zweiten Schritt der Hauptströmungsweg über das erste Ventil, welches sich im Hauptströmungsweg in Strömungsrichtung hinter der Suspensionserzeugung und vor der Einmündung des Nebenströmungsweges befindet sowie zeitgleich oder mit geringem zeitlichen Versatz ein zweites Ventil, welches im Hauptströmungsweg in Strömungsrichtung vor der Suspensionserzeugung angeordnet ist, geöffnet wird und dass
• - in einem dritten Schritt der Gegendruck über das Trennen des Nebenströmungsweges von der Hochdruckerzeugung über ein Schaltventil abgebaut wird

und dass zum Abschalten der Hochdruck-Suspension

• - in einem ersten Schritt mittels Öffnens des Schaltventils in dem Nebenströmungsweg ein Gegendruck über den Nebenströmungsweg erzeugt wird, der die Druckdifferenz zum Abschalten der Hochdruck-Suspension über das erste Ventil verringert oder vollständig aufhebt und
• - in einem zweiten Schritt der Hauptströmungsweg über das erste Ventil, sowie zeitgleich oder mit geringem zeitlichem Versatz über das zweite Ventil, geschlossen wird und
• - in einem dritten Schritt das Schaltventil in dem Nebenströmungsweg geschlossen wird derart, dass kein Austrag aus der Düse erfolgt.

The method for switching a high-pressure suspension, in particular for switching on and off a high-pressure fluid flow mixed with solid particles, has a fluid reservoir, high-pressure generation and a nozzle. It is characteristic that to switch on the high pressure suspension

• - In a first step, a back pressure is generated via a secondary flow path, which opens into a main flow path behind a suspension generation in the main flow direction, which reduces or completely eliminates the pressure difference for switching on the high-pressure suspension via a first valve and that
• in a second step the main flow path via the first valve, which is located in the main flow path in the flow direction behind the suspension generation and before the confluence of the secondary flow path, and at the same time or with a slight time offset, a second valve which is arranged in the main flow path in the flow direction before the suspension generation, is opened and that
• - In a third step, the back pressure is reduced by separating the secondary flow path from the high pressure generation via a switching valve

and that to turn off the high pressure suspension

• - In a first step, by opening the switching valve in the secondary flow path, a counter pressure is generated via the secondary flow path, which reduces or completely eliminates the pressure difference for switching off the high-pressure suspension via the first valve and
• - In a second step, the main flow path is closed via the first valve, and at the same time or with a slight time offset via the second valve, and
• - In a third step, the switching valve in the secondary flow path is closed in such a way that there is no discharge from the nozzle.

The high pressure system of the main flow path is kept continuously under operating pressure according to the method.

The fluid pressure in the main and secondary flow path is between 1 MPa and 600 MPa.

In addition to high-pressure suspensions, pure fluid flows can also advantageously be switched on or off with discontinuous suspension conveyance.

In particular, water, liquefied technical gas, oil, solutions or emulsions are used as the fluid medium.

It is found that a method and a device are provided with which suspensions under high pressure, consisting of a fluid and a solid particle phase, can be completely switched on and off within a very short time, without the suspension production present in the system being affected Relief of pressure or significant pressure reduction.

The present device counteracts the wear and the risk of impairing the reliable switching of valve technology as a result of the flow of sometimes very hard solid particles within the suspension.

• Einen Hochdruck-Hauptströmungsweg, in dem sich in Strömungsrichtung vor der Suspensionserzeugung ein Hydraulikventil sowie in Strömungsrichtung hinter der Suspensionserzeugung ein hoch verschleißfestes Scheibenschieberventil oder Kugelventil sowie ein in Hauptströmungsrichtung nachfolgendes Verbindungsglied befinden, einen Hochdruck- Nebenströmungsweg, der durch das genannte Verbindungsglied mit dem Hauptströmungsweg verbunden ist, ein Schaltventil, welches sich in Strömungsrichtung vor einem optionalen Rückschlagventil im Nebenströmungsweg befindet sowie eine Düse, welche als Auslass der Hochdruck-Suspension fungiert und nach dem Verbindungsglied zwischen Hauptströmungsweg und Nebenströmungsweg angeordnet ist.

A valve device is provided, comprising:

• A high-pressure main flow path, in which there is a hydraulic valve in the flow direction before the suspension generation and in the flow direction behind the suspension generation a highly wear-resistant disc slide valve or ball valve and a connecting element following in the main flow direction, a high-pressure secondary flow path which is connected to the main flow path by the said connecting element , a switching valve, which is located in the direction of flow upstream of an optional check valve in the secondary flow path, and a nozzle, which functions as an outlet of the high-pressure suspension and is arranged after the connecting member between the main flow path and the secondary flow path.

The advantage of the present invention is that a suspension of solid particles and a fluid under high pressure or a predominantly pure fluid flow can be completely and safely interrupted in a discontinuous solid particle delivery. The generation of a counterpressure against the suspension or fluid flow is particularly advantageous in order to implement a switching of the highly wear-resistant disc slide valve or ball valve with a low pressure difference or without pressure difference.

The present invention advantageously keeps the high pressure system of the main flow path continuously under operating pressure. This fact significantly reduces the alternating stresses caused by changing pressure differences in the system. This offers the possibility of significantly reducing the number of load changes when designing the pressure equipment.

In contrast to the present state of the art, the bypass flow path is used to switch the wear-resistant valve in the form of a disc slide valve or ball valve without pressure difference, that is, nothing is flushed or a flow is built up against the main flow direction. The system pressure is also maintained.

The invention is explained in more detail below using an exemplary embodiment and associated drawings, without being restricted thereto.

• 1 einen Fluidplan der vorliegenden Erfindung,
• 2 eine Darstellung der Ventilstellung bei geöffnetem verschleißfestem Ventil im Arbeitszustand,
• 3 eine Darstellung der Ventilstellung unmittelbar vor dem Öffnen des verschleißfesten Ventils bei Bearbeitungsbeginn und unmittelbar nach dem Schließen des Ventils bei Bearbeitungsende,
• 4 eine Darstellung der Ventilstellung unmittelbar nach dem Öffnen des verschleißfesten Ventils bei Bearbeitungsbeginn und unmittelbar vor dem Schließen des verschleißfesten Ventils bei Bearbeitungsende,
• 5 eine Darstellung der Ventilstellung bei geschlossenem System.

Show it:

• 1 a fluid map of the present invention,
• 2nd a representation of the valve position when the wear-resistant valve is open in the working state,
• 3rd a representation of the valve position immediately before the wear-resistant valve opens at the start of machining and immediately after the valve closes at the end of machining,
• 4th a representation of the valve position immediately after opening the wear-resistant valve at the start of machining and immediately before closing the wear-resistant valve at the end of machining,
• 5 a representation of the valve position with the system closed.

1 shows the device for switching a high pressure suspension according to the preferred embodiment. This includes a fluid reservoir 1 or a fluid source connected to the high-pressure generation via a low-pressure piping 2nd connected is. The high pressure generation brings the fluid medium to a working pressure of up to 600 MPa. Accordingly, all lines from high-pressure generation are advantageously to be designed as high-pressure lines. On a first switch element in the form of a first T-piece 3rd the high pressure fluid is in a main flow path 12 and a bypass path 13 divided up. The main flow path 12 leads to a suspension generation 5 and out of this towards a nozzle 11 . In the main flow path 12 is a valve in the form of a hydraulic valve before the suspension is generated 8th and a check valve 4th provided, the check valve 4th ensures that solid particles of the suspension are not the high pressure generation 2nd and the hydraulic valve 8th reachable. The suspension production 5 with a not particularly specific embodiment consists of a high-pressure container which contains a suspension of solid particles and a fluid. The suspension can be discharged from the pressurized storage container by different, not more precisely determined, embodiments. Via the hydraulic valve 8th which is in the main flow path 12 in the flow direction before the suspension is generated 5 and a wear-resistant first valve 6 in the form of a disc valve or ball valve, which is in the main flow path 12 in the direction of flow behind the suspension generation 5 there is the possibility of the main flow path 12 to stop completely. The bypass path 13 contains a switching valve 7 in the form of a hydraulic valve, which is used to completely open or close the secondary flow path 13 responsible for. To protect this hydraulic valve 7 damage from abrasive particles is in the bypass path 13 also a check valve in the direction of flow 9 intended. The bypass path 13 flows through a second T-piece 10th in the flow direction behind the valve 6 in the main flow path 12 a. There are suitable switching cycles with the help of the secondary flow path 12 the possibility when switching the wear-resistant first valve 6 build up a back pressure that enables this wear-resistant valve 6 to switch with a low pressure difference or without pressure difference. Via a nozzle 11 of undetermined geometry, the suspension is discharged.

2nd shows the device in the working state according to the preferred embodiment. This comprises a fluid reservoir or a fluid source 1 that have low pressure piping with the high pressure generation 2nd connected is. The high pressure generation brings the fluid medium to a working pressure of up to 600 MPa, accordingly all lines from high pressure generation are designed as high pressure lines. On the first tee 3rd the high pressure fluid gets into the main flow path 12 and the bypass path 13 divided up. The check valve 4th in the main flow path 12 ensures that solid particles of the suspension generate the high pressure 2nd and the hydraulic valve 8th can't reach. The suspension production 5 with a not particularly specific embodiment consists of a high-pressure container which contains a suspension of solid particles and a fluid. The suspension can be discharged from the pressurized storage container by different, not more precisely determined, embodiments. Through the open high pressure valve 8th high pressure water flows in the main flow path 12 towards suspension production 5 . Via the open valve 6 and the main flow path 12 becomes the high pressure suspension right down to the nozzle 11 promoted. That in the side flow path 13 included hydraulic valve 7 , which is responsible for the complete opening or closing of the same, is closed in the working state. A counter pressure to switch of the first valve 6 is not available in the working state. To protect the hydraulic valve 7 against damage from abrasive particles is in the bypass path 13 the check valve in the direction of flow 9 . Through the second T-piece 10th the secondary flow path opens 13 in the main flow path 12 a. Via a nozzle 11 of undefined geometry, the discharge takes place in the form of a suspension.

3rd shows the device immediately before opening the wear-resistant first valve 6 at the start of machining or immediately after the wear-resistant valve is closed 6 at the end of processing. At the time shown are the wear-resistant valve 6 which is in the main flow path 12 in the direction of flow behind the suspension generation 5 and the hydraulic valve 8th which is in the main flow path 12 in the flow direction before the suspension is generated 5 located, closed. This is the main flow path 12 completely interrupted and there can be no high pressure suspension from the suspension production 5 towards the nozzle 11 be promoted. That in the side flow path 13 included hydraulic valve 7 , which is responsible for the complete opening or closing of the same, is open at the time shown. This creates a wear-resistant valve on the outlet side 6 a back pressure that is ideally identical to the fluid pressure on the inlet side of the wear-resistant valve 6 is. The same can therefore be switched with a low pressure difference or without pressure difference. The discharge from the nozzle 11 at the time shown consists of the pure fluid phase through the bypass flow path 13 towards the nozzle 11 undefined geometric shape flows.

4th shows the valve position immediately after opening the wear-resistant valve 6 at the start of processing and / or immediately before the valve closes 6 at the end of processing. The states are identical. At the time shown are both the hydraulic valve 7 in the bypass path 13 , as well as the wear-resistant valve 6 in the main flow path 12 as well as the hydraulic valve 8th in the main flow path 12 open. At the time the valve closes 6 can be switched with a low pressure difference or ideally without pressure difference. The discharge from the nozzle 11 at the time shown consists of the pure fluid phase through the bypass flow path 13 towards the nozzle 11 undefined geometric shape flows and can share the fluid phase from the main flow path 12 contain.

5 shows the valve position of the closed system. At the time shown are both the hydraulic valve 7 in the bypass path 13 , as well as the wear-resistant valve 6 in the main flow path 12 as well as the hydraulic valve 8th in the main flow path 12 closed. A discharge from the nozzle 11 does not take place at the time shown.

The device according to the invention and the associated method for switching a high-pressure suspension are used for cleaning, roughening and removing surfaces and for cutting workpieces.

Reference symbol list

1

Fluid storage

2nd

High pressure generation

3rd

first tee

4th

check valve

5

Suspension mixing unit

6

Wear-resistant first valve

7

Hydraulic valve

8th

Hydraulic valve

9

check valve

10th

second tee

11

jet

12

Main flow path

13

Side flow path

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102014100839 B4 [0004]
• WO 2007/134702 A1 [0005]
• EP 2308646 A1 [0006]
• DE 69816025 T2 [0007]
• WO 2012/065580 A1 [0008]
• WO 2016/020275 A1 [0009]
• DE 102014111043 A1 [0009]
• DE 102011055772 A1 [0010]
• DE 102011055770 A1 [0011]

Claims (11)

Device for switching a high-pressure suspension, in particular for switching a high-pressure fluid flow mixed with solid particles on and off, comprising a fluid reservoir (1), a high-pressure generator (2) and a nozzle (11), characterized in that the device has a main flow path, a suspension generation and a secondary flow path in such a way that a back pressure can be generated via the secondary flow path (13), which opens into the main flow path (12) behind the suspension generation (5) in the main flow direction, and which has a pressure difference for switching on or off the high-pressure suspension is reduced or completely canceled via a first valve (6) and that - the main flow path (12) via the first valve (6), which is located in the main flow path (12) in the flow direction behind the suspension generation (5) and before the confluence the secondary flow path (13) and via a second valve (8), which is in the main flow path (12) in the direction of flow in front of the suspension generation (5), can be opened or closed and that - the back pressure can be reduced by separating the secondary flow path (13) from the high pressure generation via a switching valve (7). Device after Claim 1 , characterized in that the first valve (6) is a wear-resistant valve (6) in the form of a disk slide valve or ball valve, the valve (6) being switchable by means of a linear or rotary actuating movement. Device after Claim 2 , characterized in that the disk slide valve (6) has at least three disks such that the disk slide valve (6) can be closed by means of vertical movement of at least one wear-resistant disk arranged therein, which is arranged sealingly against one another between the at least two further, fixed, wear-resistant disks. Device after Claim 2 or 3rd , characterized in that the wear-resistant discs of the disc slide valve have through holes adapted to the flow path . Device according to one of the Claims 1 to 4th , characterized in that the secondary flow path (13) has a check valve (9) in such a way that the penetration of solid particles into the secondary flow path (13) from the main flow path (12) can be prevented and / or that the main flow path (12) has a check valve (4 ) has such that the penetration of solid particles of the suspension into the high pressure generation (2) and into the second valve (8) can be prevented. Device according to one of the Claims 1 to 5 , characterized in that after the confluence of the secondary flow path (13) in the main flow path (12), a nozzle (11) for cleaning, roughening, removing or cutting an undefined geometric design is arranged. Method for switching a high-pressure suspension, in particular for switching on and off a high-pressure fluid flow mixed with solid particles, comprising a fluid reservoir, high-pressure generation and a nozzle, characterized in that for switching on the high-pressure suspension - in a first step a back pressure is generated via a secondary flow path (13), which opens into a main flow path (12) in the main flow direction behind a suspension generation (5), which reduces or completely eliminates the pressure difference for switching on the high-pressure suspension via a first valve (6) and that - in a second step, the main flow path (12) via the first valve (6), which is located in the main flow path in the flow direction behind the suspension generation (5) and before the confluence of the secondary flow path (13), and at the same time or with a slight time offset, a second Valve (8), which in the main flow path (12) in Str Ömungsrichtung is arranged in front of the suspension generation (5), is opened and that - in a third step, the back pressure is reduced by separating the secondary flow path (13) from the high pressure generation via a switching valve (7) and that for switching off the high pressure suspension - in in a first step, by opening the switching valve (7) in the secondary flow path, a counter pressure is generated via the secondary flow path (13), which reduces or completely eliminates the pressure difference for switching off the high pressure suspension via the first valve (6) and - in a second step the main flow path (12) is closed via the first valve (6), and at the same time or with a slight time offset via the second valve (8), and - in a third step, the switching valve (7) in the secondary flow path is closed in such a way that none Discharge from the nozzle takes place. Procedure according to Claim 7 , characterized in that the high pressure system of the main flow path (12) is kept continuously under operating pressure. Procedure according to the Claims 7 and 8th , characterized in that the fluid pressure in the The main and secondary flow paths (12, 13) are between 1 MPa and 600 MPa. Procedure according to one of the Claims 7 to 9 , characterized in that in addition to high-pressure suspensions, pure fluid flows can also be switched on or off with discontinuous suspension conveyance. Procedure according to one of the Claims 7 to 10th , characterized in that water, liquefied technical gas, oil, solutions or emulsions are used as the fluid medium.

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