Patent Description:
In food processing technologies, a liquid food passes through various lines. In some of the lines, a temperature of such liquid food may be very high e.g. above <NUM>. An example of such food processing technologies is the ultra-high temperature (UHT) processing. At such high temperatures, it is required to prevent the liquid food from boiling in the line, as boiling may adversely affect the properties of the liquid food. Therefore, a counter pressure is required to prevent the liquid food from boiling. A conventional solution of creating the counter pressure is to reduce a through-gap of the line that the liquid food passes through e.g. by a valve that adjusts the line through-gap.

However, such solution may not be applicable for liquid foods which contain particles since the particles may block the valve and/or the particles may be destroyed when passing through the valve, as they may collide with one another. Therefore, there is a need for a new device for creating a counter pressure in the lines configured to pass the liquid food containing particles. Furthermore, there is a need for a new method for creating the counter pressure in such device. <CIT>, <CIT>, <CIT> and <CIT> show systems and methods for sterilizing and filling liquids containing particulate material wherein boiling in the fluid line of the system is avoided through pressure control.

It is an object of the invention to at least partly overcome one or more of the above-identified limitations of the prior art. In particular, it is an object of the invention to provide a device for creating a backpressure in a fluid line configured to convey a food product containing particles that protects the device from becoming blocked by the particles and that protects the particles of the food product from being destroyed. It is another object of the invention to provide a method for creating a backpressure in a fluid line configured to convey a food product containing particles in accordance with the device. It is yet another object of the invention to provide a system for processing a food product containing particles that protects the system from becoming blocked by the particles and that protects the particles from being destroyed. It is yet another object of the invention to provide a method for processing a food product containing particles in accordance with the system.

According to a first aspect of the invention, a device is provided. The device is configured for creating a backpressure in a fluid line configured to convey a food product containing particles. The device further comprises a first channel comprising an inlet and an outlet for conveying the product in a first direction. The device comprises a second channel comprising an inlet and an outlet in fluid communication with the first channel, for receiving a part of the product from the first channel and thereafter returning said part to the first channel. The device further comprises a filtering section arranged at the inlet of the second channel and configured to let through said part of the product from the first channel into the second channel, while blocking the particles contained in the food product. The device further comprises a flow redirecting section arranged at the outlet of the second channel and configured to redirect said part of the product in a second direction when said part is returned to the first channel from the second channel. The second direction is at least partially opposite to the first direction for creating the backpressure in the fluid line.

The inlet of the first channel receives the food product containing the particles and conveys the food product, containing the particles, towards the outlet of the first channel in the first direction. The inlet of the second channel which is in fluid communication with the first channel receives the part of the product which has passed through the filtering section, arranged at the inlet of the second channel. Thereby, the filtering section blocks the particles contained in the food product from entering the second channel. Hence, the second channel receives and conveys the part of the product which does not contain any particles or at least contains less particles with sizes smaller than openings or holes of the filtering section. Hence, a remaining part of the food product i.e. the part not received by the second channel continues to flow or pass through the first channel.

The part of the product, received and conveyed in the second channel, returns from the outlet of the second channel to the first channel, as the outlet of the second channel is in fluid communication with the first channel. The part of the product returns from the outlet of the second channel to the first channel in the second direction which is partially opposite to the first direction by means of the flow redirecting section arranged at the outlet of the second channel.

The device is advantageous in that it creates the backpressure in the fluid line and hence prevents the food product containing the particles from boiling in the fluid line. The back pressure may be empirically chosen so as to prevent the food product containing the particles from boiling in the fluid line. In addition, the device is advantageous in that the back pressure is created by the part of the product that does not contain any particles or at least contains less particles with sizes smaller than openings or holes of the filtering section. Thereby, all particles of the food product or at least most particles of the food product i.e. those particles having sizes larger than the openings or holes of the filtering section which are blocked by the filtering section, do not contribute to the creation of the back pressure. This in turn allows for protecting all particles of the food product or at least most particles of the food product i.e. those particles having sizes larger than the openings or holes of the filtering section which are blocked by the filtering section from colliding with one another and from being destroyed.

In addition, the device is advantageous in that it provides a simple and a user-friendly solution, compared to the conventional valve solution. This is because the device of the invention does not require any valves and hence the device of the invention do not have the problems of the conventional solution that the particles may block the valve and the valve may require a repair or a maintenance. Instead, in the device of the invention, the particles blocked by the filtering section pass through the first channel and hence do not block the fluid line.

The food product may comprise any of or any combination of milk, juice, yoghurt, plant based beverage, soup or any other liquid or semi liquid product that is consumed as food by humans or animals. The particles may be fruits, nuts, grains, seeds, vegetable, meat, or any other particle that is consumed as food by humans or animals, inherently having a size of <NUM> to <NUM> or cut to pieces having a size in the range of <NUM> to <NUM>. The first direction may be a direction of transportation of the food product in the first channel at the location of the outlet of the second channel.

The flow redirecting section may comprise a flow redirecting surface. The flow redirecting surface may be configured to redirect the part of the product returned from the second channel into the first channel in the second direction.

The flow redirecting surface may allow for redirecting the part of the product returned from the second channel into the first channel in the second direction being at least partially opposite to the first direction. Thereby, the flow redirecting surface may allow for creating the backpressure in the fluid line and may hence prevent the food product, containing the particles, from boiling in the fluid line.

The flow redirecting surface may be arranged with an angle in the range of <NUM> to <NUM> degrees with respect to the first direction at the location of the outlet of the second channel.

Thereby, the second direction may vary from being completely opposite to the first direction to being partially opposite to the first direction with an angle of <NUM> degrees with respect to the first direction at the location of the outlet of the second channel. The angle of <NUM> to <NUM> degrees may allow for redirecting the part of the product in the desired second direction when the part returns to the first channel from the second channel. This may in turn allow for creating the desired backpressure in the fluid line.

The size of the smallest cross-sectional through flow area of the second channel may be in the range of <NUM>% to <NUM>% of the size of the smallest cross-sectional through flow area of the first channel.

The ratio of the size of the smallest cross-sectional through flow area of the second channel with respect to the size of the smallest cross-sectional through flow area of the first channel may allow for creating various backpressures in the fluid line. The size of the smallest cross-sectional through flow area of the second channel being in the range of <NUM>% to <NUM>% of the size of the smallest cross-sectional through flow area of the first channel may allow for creating the desired backpressure in the fluid line.

The filtering section may comprise a plurality of openings of which each has, in at least one direction of the respective opening, an extension of at most <NUM>.

The filtering section may be a surface comprising a plurality of openings. The filtering section may comprise a filtering device. The filtering section may comprise a strainer, a sieve, a mesh or any other suitable filtering device. The filtering section may comprise any material suitable for the food product. The filtering section may be arranged with an angle in the range of, for example, <NUM> to <NUM> degrees with respect to a direction of the food product at the location of the inlet of the second channel. This may in turn facilitate the part of the food product to flow from the first channel into the second channel.

The second channel may be arranged inside the first channel. The second channel may be defined by at least one partition wall that separates the second channel from the first channel.

It is an advantage that the second channel may not require extra space, as it may be arranged inside the first channel. This in turn may allow for a simple and compact device for creating the backpressure in the fluid line configured to convey the food product containing particles.

The flow redirecting section may be arranged adjacent to the outlet of the second channel and with a distance of <NUM> to <NUM> to the second channel, as seen along the first direction.

Thereby, the distance in the range of <NUM> to <NUM> between the flow redirecting section and the second channel, along the first direction, may be suitable for creating the desired backpressure in the fluid line when conveying the food product in the fluid line. The distance of in the range of <NUM> to <NUM> between the flow redirecting section and the second channel, along the first direction, may be suitable when e.g. cleaning the fluid line. The cleaning of the fluid line may be performed by a cleaning-in-place (CIP) system. A cleaning process may require conveying water and a cleaning solution e.g. a detergent in the fluid line. The distance of in the range of <NUM> to <NUM>, during the cleaning process of the fluid line, may be advantageous as it may allow for decreasing the backpressure in the fluid line. Hence, it may allow for a higher flow rate of the cleaning solution in the fluid line and a more efficient cleaning.

The device may further comprise an actuator. The actuator may be connected to the partition wall for moving the partition wall between a first position and a second position, such that a distance between the outlet of the second channel and the flow redirecting section is greater when the partition wall is in the second position, as compared to when the partition wall is in the first position.

Thereby, the actuator may allow for varying the distance between the flow redirecting section and the second channel along the first direction. This may in turn allow for adjusting the distance to a lower range when conveying the food product in the fluid line to create the desired backpressure in the fluid line. This may in turn also allow for adjusting the distance to a higher range when performing the cleaning process in the fluid line to obtain a more efficient cleaning.

The device may comprise a pipe in which the partition wall is located. The partition wall is, as seen across the first direction, smaller than the pipe, such that the second channel is formed by an interspace between the pipe and an exterior surface of the partition wall. The partition wall may comprise an interior through-flow opening that forms the first channel.

For instance, the device may comprise a first tube and a second tube in which the second tube, as seen across the first direction, smaller than the first tube i.e. a double tube. The interior through-flow opening of the second tube may form the first channel. The interspace between the first channel and the second channel may form the second channel. This may in turn provide a simple and compact device for creating the backpressure in the fluid line configured to convey the food product containing particles.

The filtering section may extend from the partition wall, in a direction towards the pipe at the inlet of the second channel.

In the case of the double tube, the filtering section may extend from an end of the second tube, being the inlet of the second channel, in a direction towards the first tube. The filtering section may be arranged with an angle with respect to a direction of the food product at the location of the inlet of the second channel. This may in turn facilitate the part of the food product to flow from the first channel into the second channel.

The flow redirecting section my arranged on an interior surface of the pipe.

The flow redirecting section may extend from the pipe, in a direction towards the partition wall at the outlet of the second channel. In the case of the double tube, the flow redirecting section may extend from the first tube in a direction towards another end of the second tube, being the outlet of the second channel.

The device may comprise a first pipe that forms the first channel and an adjacent second pipe that forms the second channel. The second pipe may comprise at its outlet a part that forms the flow redirecting section.

The device may comprise two pipes e.g. two tubes, arranged adjacent to one another such that the inlet and the outlet of the second pipe are in fluid communication with the first pipe. It is an advantage that at least the second pipe may be accessible individually. This may be advantages when needing to e.g. repair the second pipe without needing to open the first pipe.

According to a second aspect of the invention, a system is provided. The system is configured for processing a food product containing particles. The system comprises a pump for feeding the product to a food processing arrangement. The system further comprises the food processing arrangement configured to process the food. The system further comprises a device according to the first aspect of the invention for creating a backpressure in the food processing arrangement.

The pump may be any conventional and commercially available pump, suitable for the processing of the food product containing particles. The system allows for protecting the system from becoming blocked by the particles of the food product and protecting the particles of the food product from being destroyed. This aspect may generally present the same or similar advantages, as those defined in relation to the first aspect.

According to a third aspect of the invention a method is provided. The method is provided for creating a backpressure in a fluid line configured to convey a food product containing particles. The method comprises conveying the product in a first direction in a first channel that has an inlet and an outlet. The method further comprises receiving, with a second channel that has an inlet and an outlet in fluid communication with the first channel, a part of the product from the first channel and thereafter returning said part to the first channel. The method further comprises letting through, during the receiving of said part of the product and via a filtering section arranged at the inlet of the second channel, said part of the product from the first channel into the second channel, while blocking particles contained in the product. The method further comprises redirecting, with a flow redirecting section arranged at the outlet of the second channel, said part of the product in a second direction when said part is returned to the first channel from the second channel. The second direction is at least partially opposite to the first direction for creating the backpressure in the fluid line.

The method may be performed using the device defined according to the first aspect of the invention. This aspect may generally present the same or similar advantages, as those defined in relation to the first aspect.

According to a fourth aspect of the invention a method is provided. The method is provided for processing a food product containing particles. The method comprises pumping the product to a food processing arrangement. The method further comprises processing the food in the food processing arrangement. The method further comprises creating a backpressure in the food processing arrangement by performing the method according to the third aspect of the invention.

The method may be performed using the system defined according to the second aspect of the invention. This aspect may generally present the same or similar advantages, as those defined in relation to the second aspect.

<FIG> and <FIG> are cross sectional side views of a device <NUM> for creating a backpressure in a fluid line <NUM>. The fluid line <NUM> is configured to convey a food product F containing particles P. The fluid line <NUM> may be connected to other lines. The fluid line <NUM> may a part of a system <NUM> for processing a food product F. The particles P may have any shapes such as a spherical shape or a cubic shape. The particles P may have a size larger than <NUM>. At least a dimension of the particles P may be larger than <NUM>. For instance, a dimeter of the particles P may be larger than <NUM>.

The device <NUM> comprises a first channel <NUM>. The first channel <NUM> comprises an inlet <NUM> and an outlet <NUM> for conveying the product F in a first direction D1. The device <NUM> further comprises a second channel <NUM>. The second channel <NUM> comprises an inlet <NUM> and an outlet <NUM>. The inlet <NUM> and the outlet <NUM> of the second channel <NUM> are in fluid communication with the first channel <NUM>. The second channel <NUM> receives a part F2 of the product F from the first channel <NUM>. The second channel <NUM> receives the part F2 of the product F from the first channel <NUM> at the inlet <NUM> of the second channel <NUM>. A remaining part F1 of the product F i.e. the part not received by the second channel <NUM> passes through the first channel <NUM>. The second channel <NUM> thereafter returns the part F2 of the product F to the first channel <NUM>. The second channel <NUM> thereafter returns the part F2 of the product F to the first channel <NUM> at the outlet <NUM> of the second channel <NUM>. The first channel <NUM> may convey another part F1 of the food product F in.

The size of the smallest cross-sectional through flow area of the second channel <NUM> is in the range of <NUM>% to <NUM>% of the size of the smallest cross-sectional through flow area of the first channel <NUM>. The smallest cross-sectional through flow area of the second channel <NUM> may, for example, be in the range of <NUM> to <NUM><NUM>. The smallest cross-sectional through flow area of the first channel <NUM> may, for example, be in the range of <NUM> to <NUM><NUM>.

The device <NUM> further comprises a filtering section <NUM>. The filtering section <NUM> may be referred to as a perforated section and comprises openings for letting liquid product pass the filtering section <NUM>, while blocking larger particles, such as particles having a size larger than <NUM>. The filtering section <NUM> is arranged at the inlet <NUM> of the second channel <NUM>. The filtering section <NUM> is configured to let through the part F2 of the product F from the first channel <NUM> into the second channel <NUM>. The filtering section <NUM> is configured to block the particles P contained in the food product F. The filtering section <NUM> may comprise a plurality of openings <NUM>. Each of the plurality of openings <NUM> may have, in at least one direction of the respective opening <NUM>, an extension of at most <NUM>.

The device <NUM> further comprises a flow redirecting section <NUM>. The flow redirecting section <NUM> is arranged at the outlet <NUM> of the second channel <NUM>. The flow redirecting section <NUM> is configured to redirect the part F2 of the product F in a second direction D2 when the part F2 is returned to the first channel <NUM> from the second channel <NUM>. The second direction D2 is at least partially opposite to the first direction D1, thereby creating the backpressure in the fluid line <NUM>. The flow redirecting section <NUM> comprises a flow redirecting surface <NUM>. The flow redirecting surface <NUM> may be configured to redirect the part F2 of the product F returned from the second channel <NUM> into the first channel <NUM> in the second direction D2. The flow redirecting surface <NUM> may be arranged with an angle α with respect to the first direction D1 at the location of the outlet <NUM> of the second channel <NUM>. The angle may be in the range of <NUM> to <NUM> degrees. The flow redirecting section <NUM> may have a circular shape, just like the outlet <NUM>,.

The second channel <NUM> is arranged inside the first channel <NUM>. The second channel <NUM> may be defined by at least one partition wall <NUM> that separates the second channel <NUM> from the first channel <NUM>. The second channel <NUM> may be defined by more than one partition wall <NUM> such two or three partition walls <NUM>. <FIG> also shows a magnified view of a part of the device <NUM>. The magnified view shows that the at least one partition wall has an exterior surface <NUM> and an interior surface <NUM>.

The flow redirecting section <NUM> is arranged adjacent to the outlet <NUM> of the second channel <NUM>. A distance G between the flow redirecting section <NUM> and the second channel <NUM> may be of <NUM> to <NUM>, as seen along the first direction D1. The distance G may be adjusted by means of an actuator <NUM>. The device <NUM> further comprises an actuator <NUM>. The actuator <NUM> may be connected to the partition wall <NUM> e.g. connected to an end of the partition wall <NUM>. The actuator <NUM>, connected to the partition wall <NUM>, may move the partition wall <NUM> between a first position P1 and a second position P2. The distance G between the outlet <NUM> of the second channel <NUM> and the flow redirecting section <NUM> may be greater when the partition wall <NUM> is in the second position P2, as compared to when the partition wall <NUM> is in the first position P1. <FIG> shows that the partition wall <NUM> of the device <NUM> is in the first position P1. <FIG> shows that the partition wall <NUM> of the device <NUM> is in the second position P2. The distance G shown in <FIG> is smaller than the distance G shown in <FIG>, along the first direction D1.

The device <NUM> comprises a pipe <NUM> in which the partition wall <NUM> is located. The pipe <NUM> may have an interior surface <NUM>. The flow redirecting section <NUM> may be arranged on the interior surface <NUM> of the pipe <NUM>. The flow redirecting section <NUM> may be arranged on and in contact with a portion of the interior surface <NUM> of the pipe <NUM>. <FIG> show a cross sectional view of a pipe <NUM> and the partition wall <NUM>. The partition wall <NUM> is, as seen across the first direction D1, smaller than the pipe <NUM>. The second channel <NUM> is formed by an interspace between the pipe <NUM> and the exterior surface <NUM> of the partition wall <NUM>. The partition wall <NUM> may comprises an interior through-flow opening <NUM> that forms the first channel <NUM>. The filtering section <NUM> extends from the partition wall <NUM>, in a direction towards the pipe <NUM>. The filtering section <NUM> may be arranged with an angle in the range of <NUM> to <NUM> degrees with respect to a direction of the food product at the location of the inlet <NUM> of the second channel <NUM>.

<FIG> shows a cross sectional side view of another device <NUM> for creating a backpressure in a fluid line. This device <NUM> comprises a first pipe <NUM>. The first pipe <NUM> is a bend pipe. The first pipe <NUM> may not be a bend pipe. The first part <NUM> may form the first channel <NUM>. The first channel comprises an inlet <NUM> and an outlet <NUM> for conveying the product F in a first direction D1.

The device <NUM> comprises an adjacent second pipe <NUM>. The adjacent second pipe <NUM> may form the second channel <NUM>. The second pipe <NUM> is a bend pipe. The second channel <NUM> comprises an inlet <NUM> and an outlet <NUM>. The inlet <NUM> and the outlet <NUM> of the second channel <NUM> are in fluid communication with the first channel <NUM>. The second channel <NUM> receives a part F2 of the product F from the first channel <NUM>. The second channel <NUM> thereafter returns the part F2 to the first channel <NUM>. The size of the smallest cross-sectional through flow area of the second channel <NUM> may be in the range of <NUM> to <NUM>% of the size of the smallest cross-sectional through flow area of the first channel <NUM>.

The device <NUM> comprises a filtering section <NUM>. The filtering section <NUM> is arranged at the inlet <NUM> of the second channel <NUM>. The filtering section <NUM> is configured to let through the part F2 of the product F from the first channel <NUM> into the second channel <NUM>. The filtering section <NUM> is configured to block the particles P contained in the food product F. A remaining part F1 of the product F i.e. the part not received by the second channel <NUM> passes through the first channel <NUM>. The filtering section <NUM> comprises a plurality of openings <NUM>. Each of the plurality of openings <NUM> may have, in at least one direction of the respective opening <NUM>, an extension of at most <NUM>.

<FIG> further shows that the device comprises a flow redirecting section <NUM>. The flow redirecting section <NUM> is arranged at the outlet <NUM> of the second channel <NUM>. The flow redirecting section <NUM> is configured to redirect the part F2 of the product F in a second direction D2 when the part F2 is returned to the first channel <NUM> from the second channel <NUM>. The second direction D2 is at least partially opposite to the first direction D1, thereby creating the backpressure in the fluid line <NUM>. The second pipe <NUM> comprises at its outlet <NUM> a part <NUM> that forms the flow redirecting section <NUM>. The part <NUM> may be a portion of the second pipe <NUM>. The flow redirecting section <NUM> may comprise a flow redirecting surface <NUM>. The flow redirecting surface <NUM> may be configured to redirect the part F2 of the product F returned from the second channel <NUM> into the first channel <NUM> in the second direction D2. The flow redirecting surface <NUM> is arranged with an angle α with respect to the first direction D1 at the location of the outlet <NUM> of the second channel <NUM>. The angle α may be in the range of <NUM> to <NUM> degrees.

<FIG> shows a schematic illustration of a system <NUM> for processing a food product F containing particles P. The system <NUM> comprises a pump <NUM>. The system <NUM> comprises also a food processing arrangement <NUM>. The pump <NUM> is arranged upstream the food processing arrangement <NUM>. The pump <NUM> is configured for feeding the product F to the food processing arrangement <NUM>. The food processing arrangement <NUM> is configured to process the food F. The system <NUM> comprises a device <NUM> that is arranged in the food processing arrangement <NUM>. The device <NUM> may be similar to the devices <NUM> shown in <FIG>. The device <NUM> may be similar to the device <NUM> shown in <FIG>. The device <NUM> creates a backpressure in the food processing arrangement <NUM>. The food processing arrangement <NUM> may be a heat treatment unit, and the device <NUM> may arranged downstream the heat treatment unit to ensure that a certain pressure is maintained in the heat treatment unit.

<FIG> is a schematic illustration of steps of a method <NUM> for creating a backpressure in a fluid line <NUM>. The fluid line <NUM> is configured to convey a food product F containing particles P. The method <NUM> comprises conveying <NUM> the product F in a first direction D1 in a first channel <NUM> that has an inlet <NUM> and an outlet <NUM>. The method <NUM> comprises receiving <NUM>, with a second channel <NUM> that has an inlet <NUM> and an outlet <NUM> in fluid communication with the first channel <NUM>, a part F2 of the product F from the first channel <NUM>. The step of receiving <NUM> may be performed subsequent to the step of conveying <NUM>. The step of receiving <NUM> may be performed simultaneously with the step of conveying <NUM>.

The method <NUM> comprises thereafter returning <NUM> the part F2 from the second channel <NUM> to the first channel <NUM>. The method <NUM> comprises letting through <NUM>, during the receiving <NUM> of said part F2 of the product F and via a filtering section <NUM> arranged at the inlet <NUM> of the second channel <NUM>, the part F2 of the product F from the first channel <NUM> into the second channel <NUM>. The method <NUM> comprises blocking <NUM> the particles P contained in the product F1 while letting through <NUM> the part F2 of the product F from the first channel <NUM> into the second channel <NUM>. The steps of letting through <NUM>, blocking <NUM> and receiving <NUM> may be performed simultaneously.

The method <NUM> comprises redirecting <NUM>, with a flow redirecting section <NUM> arranged at the outlet <NUM> of the second channel <NUM>, the part F2 of the product F in a second direction D2 when the part F2 is returned to the first channel <NUM> from the second channel <NUM>. The second direction D2 is at least partially opposite to the first direction D1, thereby creating the backpressure in the fluid line <NUM>. The step of redirecting <NUM> may be performed simultaneously with the step of returning <NUM>. The method <NUM> may be performed by means of the devices shown in <FIG>. Alternatively, the method <NUM> may be performed by means of the device shown in <FIG>.

<FIG> is a schematic illustration of steps of a method <NUM> for processing a food product F containing particles P. The method <NUM> comprises pumping <NUM> the product F to a food processing arrangement <NUM>. The method <NUM> comprises processing <NUM> the food F in the food processing arrangement <NUM>. The method <NUM> comprises creating <NUM> a backpressure in the food processing arrangement <NUM>. The step of creating <NUM> the backpressure may be performed using the method <NUM> shown in <FIG>. The step of processing <NUM> may be performed subsequent to the step of pumping <NUM>. The step of creating <NUM> may be performed subsequent to the step of processing <NUM>. The step of creating <NUM> may be performed simultaneously with the step of processing <NUM>. The method <NUM> may be performed by means of the system <NUM> shown in <FIG>.

Claim 1:
A device (<NUM>) for creating a backpressure in a fluid line (<NUM>) configured to convey a food product (F) containing particles (P), the device (<NUM>) comprising:
a first channel (<NUM>) comprising an inlet (<NUM>) and an outlet (<NUM>) for conveying the product (F) in a first direction (D1),
a second channel (<NUM>) comprising an inlet (<NUM>) and an outlet (<NUM>) in fluid communication with the first channel (<NUM>), for receiving a part (F2) of the product (F) from the first channel (<NUM>) and thereafter returning said part (F2) to the first channel (<NUM>),
a filtering section (<NUM>) arranged at the inlet (<NUM>) of the second channel (<NUM>) and configured to let through said part (F2) of the product (F) from the first channel (<NUM>) into the second channel (<NUM>), while blocking particles (P) contained in the product (F), and
a flow redirecting section (<NUM>) arranged at the outlet (<NUM>) of the second channel (<NUM>) and configured to redirect said part (F2) of the product (F) in a second direction (D2) when said part (F2) is returned to the first channel (<NUM>) from the second channel (<NUM>), wherein the second direction (D2) is at least partially opposite to the first direction (D1) for creating the backpressure in the fluid line (<NUM>).