DE102018115608A1 - Filling device and method for filling a filling product into a container - Google Patents

Abstract

The present invention relates to a filling element (1) for filling a filling product into a container, preferably for filling sauce into bottles, comprising a valve (2) for influencing a filling product flow, and a working cylinder (20) which can be switched via an actuating fluid for specifying the switching positions of the valve (2), the actuating fluid being able to be removed from the working cylinder (20) via a pressure control device (3), and a corresponding method.

Description

Technical field

The present invention relates to a filling element for filling a filling product into a container, preferably for filling sauces in bottles, and a corresponding method.

State of the art

It is known to use rotary fillers with pneumatically operated filling elements for filling filling products, for example beverages or flowable foods such as soups or sauces, in particular barbecue sauces or ketchup.

It is known to provide single-acting pneumatic cylinders for opening and closing the filling elements, which are designed to close compressed air and open spring force - or vice versa. In such filling elements, control valves can be provided, among other things, in the supply lines between a product tank and the actual filling valves, which can be designed, for example, as shut-off valves or also diaphragm valves with a fixed throttle bore in the valve seat, which change the supply line cross section by suitable switching on and off fast or slow filling according to the application is possible with the filling valve open. Diaphragm valves can also be used to hold back filling elements with a filling pipe outlet by volume work, thus partially increasing the filling pipe cross section or the cross section in the product line in front of the filling pipe by switching, for example, the diaphragm valve in the appropriate direction, product residues and drops at the outlet of the filling pipe , or suck back into the filling tube, which increases the quality of the filling in order to avoid contamination of the containers to be filled.

The pneumatic cylinders are usually always opened and closed at the same speed at constant working air pressures. Depending on the rheological properties of the flowable filling products to be filled, a slow closing of the shut-off device, for example in the case of a forward-closing valve, and a slow switchover from rapid to slow filling, for example in the case of a diaphragm valve in a product line, can be advantageous for low-viscosity products, in order to avoid too much Avoid accelerating the filling product during the switching process. On the other hand, rapid (forward) closing can be beneficial in the case of highly viscous filling products in order to optimize tearing off the product jet at the outlet of the filling elements. For application-dependent adaptation of the opening or closing speed of shut-off valves or other functional units in the filling element controlled by a pneumatic working cylinder, fixed supply air and / or exhaust air orifices are therefore usually installed in the supply lines and exhaust air ducts in order to supply or remove the supply air to the working cylinder throttling so that the opening or closing speed can be set to suit the application. This achieves sufficient control dynamics of the pneumatic components in the filling elements for individual applications, e.g. for a product group to be filled with almost identical rheological properties.

Since the filling elements described are equipped with fixed supply air or exhaust air throttles for controlling the pneumatic cylinders, when filling a product range with widely varying rheological properties on a filling machine, such as filling products with widely differing viscosities, filling products with and without solid components and / or particles, Newtonian as well as non-Newtonian fluids, stringy filling products, and / or filling products with rheological yield point entail an increased conversion effort for the respective adaptation. In particular, to convert from one product group to another product group, the supply air and / or exhaust air screens must be replaced.

In the case of low-viscosity filling products, for example, closing the pneumatic cylinder too quickly to switch from quick filling to slow filling and closing the cone of the shut-off valves too quickly has a negative effect. The low-viscosity filling product is greatly accelerated by the closing pulse, which can cause the filling jet to oscillate at the outlet of the shut-off valve. Since the forward-closing valve cones of the shut-off valves accelerate the filling product beyond the actual exit velocity of the filling jet, the jet is compressed and thickens or also starts to oscillate. With the often narrow mouth cross-sections of the containers to be filled, these phenomena can result in the filling jet no longer being able to hit the container mouth properly, product loss, dirty container outer sides and openings or threads, strong foaming or even foaming from the containers, as well as product splashes from the Containers out are possible consequences.

In the case of highly viscous filling products, on the other hand, which tend to stick or string, or have a rheological flow limit, a fast closing speed of the shut-off valves has a positive effect. If the closing speed is too low, on the other hand, filling product may adhere to the outlets of the shut-off valves when it closes, build up, drip uncontrollably and thus contaminates the containers to be filled at critical points or pulls threads that can also contaminate the containers. Filling products with a rheological flow limit must also be greatly accelerated at free-end filling to allow the filling jet to be completely immersed in the filling level, since on the other hand product cones can form on the product surface, which may protrude beyond the container mouth and thus the container mouth and closure can spot.

When using functional units operated with a pneumatic cylinder, e.g. Diaphragm valves in filling elements with filling tube outlet for droplet retention, the filling product to be retained can also be sucked in too quickly by increasing the cross-section and volume represented by the membrane valves, which results in the risk of air being sucked in. If air has been sucked in, the filling pipe can run empty, which creates a negative effect, in that containers are overfilled or contaminated by dripping product. Depending on the rheological properties of the media to be filled in combination with the cross-sections of the filling pipe, it is useful to adjust the switching speed of the pneumatic functional units used.

For the filling of a wide range of products, a compromise design of supply air or exhaust air restrictors for the shut-off valves of the filling elements and the other pneumatic functional units used is difficult to implement. This usually results in a significant deterioration in the filling of each of the products for the widely differing filling products. In order to be able to optimally fill a wide range of products, with the existing filler and control technology only the time and labor-intensive exchange of supply air or exhaust air restrictors is possible in order to display the respective optimal control dynamics of the valves or pneumatic functional units for fill products with different rheological properties.

Presentation of the invention

Starting from the known prior art, it is an object of the present invention to provide an improved filling element for filling a filling product into a container, preferably for filling sauces in bottles, and a corresponding method.

The object is achieved by a filling element for filling a filling product into a container, preferably for filling sauce into bottles with the features of claim 1. Advantageous further developments result from the subclaims, the present description and the attached figures.

Accordingly, a filling element for filling a filling product into a container, preferably for filling sauces into bottles, is proposed, comprising a valve for influencing a filling product flow, and a working cylinder which can be switched via an actuating fluid for specifying the switching positions of the valve. According to the invention, a pressure control device is provided, via which the actuating fluid can be removed from the working cylinder in a controlled manner.

Due to the fact that the actuating fluid can be removed from the working cylinder in a controlled manner via a pressure control device, different filling products can be filled with the same filling element, whereby the filling products can have widely differing rheological properties, such as widely differing viscosities, content of solid components and / or particles, and Newton 'Sche and non-Newtonian fluids, stringing product and products with rheological yield point, without having to make mechanical changes to the filler or change the filler, for example in the form of replacing orifices or a valve cone.

In other words, the switching speed, and consequently the opening and closing speed, of the valve can be adapted or optimized to the respective product properties without mechanical intervention, for example an exchange of exhaust air throttles. This enables filling products of various rheological properties to be filled on a filling machine using the same filling element with parameters adapted to the respective filling product. Low-viscosity filling products with a slow closing speed of the valve and / or high-viscosity filling products with a fast closing speed are preferably filled.

Preferably, a switching speed, preferably an opening speed and / or a closing speed, of the valve can be individually controlled / regulated by the pressure control device.

The switching speed of the valve can be specified by means of a corresponding back pressure setting in the pressure control device and adapted accordingly. The higher the setting of the back pressure in the pressure control device, the slower the resulting switching speed.

In the present case, actuating fluid is understood to be a fluid which is used for the working cylinder Actuation of a piston of the working cylinder on at least one side of the working cylinder with respect to the piston, which divides the interior of the working cylinder into two chambers, and which thereby acts on the piston. The working fluid is preferably gaseous, particularly preferably a gas, a gas mixture, compressed air, or liquid, particularly preferably a hydraulic fluid, preferably a hydraulic oil.

In a preferred further embodiment, the pressure in the pressure regulating device can be changed with respect to the switching position or with respect to a position of a piston of the working cylinder, and can therefore be adjusted or adjusted. In this way the switching speed can be adjusted along the path of the piston in the working cylinder. In particular, if the working cylinder is of single-acting design and the chamber of the working cylinder opposite the compressed air side is spring-loaded, a change in the pressure on the pressure side by the pressure control device can result in a spring force acting on the piston, which correspondingly increases with increasing travel of the piston in the working cylinder the decreasing compression of the spring can be reduced.

According to a further preferred embodiment, actuating fluid supplied to the working cylinder is supplied unthrottled. As a result, speed control and / or regulation takes place solely via the pressure control device when discharging actuating fluid. A filling element designed in this way correspondingly has a simple and at the same time robust construction.

The pressure can be controlled particularly precisely if, according to a further preferred embodiment, the pressure control device has a control valve, preferably a proportional control valve.

In order to support the pressure control by the pressure control device, the pressure control device can have a buffer store for buffering actuating fluid, the buffer store preferably being arranged between the working cylinder and the control valve.

In a further preferred embodiment, the pressure control device can have an OR valve or a shuttle valve. This makes it possible to guide inflowing actuating fluid when pressurizing the working cylinder to those parts of the pressure regulating device which regulate the residual pressure of the actuating fluid when the actuating fluid is discharged. A separate channel can thus be provided for supplying the actuating fluid. A further channel can be provided to discharge the actuating fluid, via which the residual pressure during the discharge can be regulated. The two channels can be alternately connected to the working cylinder or a connecting line to one side of the working cylinder by the OR valve. According to a particularly preferred embodiment, the working cylinder is designed as a pneumatic cylinder, the actuating fluid preferably being compressed air. As a result, the filling element can be used in common filling systems, which are usually operated with compressed air, without major changes to the filling system being necessary.

A particularly simple construction of the filling element can be achieved if, according to a further preferred embodiment, the working cylinder is a single-acting working cylinder, preferably a single-acting pneumatic cylinder. The working cylinder is preferably designed to close compressed air and spring force or to open compressed air and close spring force.

If the working cylinder is designed as a double-acting working cylinder, preferably as a double-acting pneumatic cylinder, it is possible to have the pressure control device exert an influence on both chambers of the working cylinder. In other words, at least one pressure control device can be connected to the working cylinder in such a way that a pressure control device is connected to one of the two chambers of the cylinder when this actuating fluid, preferably compressed air, is or is to be discharged. This allows alternating exhaust air and compressed air control to take place on both sides, so that the switching speed can be set individually in both switching directions. The back pressure provided can be different for both switching directions, which results in different switching speeds. In the other chamber, which is alternately not connected to a pressure control device and on which the working cylinder is supplied with pressure corresponding to the working cylinder under pressure, which is higher than the pressure specified by the pressure control device, the supply can take place without throttling. It is therefore not necessary to provide throttle orifices on the feed side either.

A particularly robust and easy-to-connect filling element can be realized in that the double-acting working cylinder has two connections, each of the connections being connectable with a separate drain guide having a pressure control device, or the two connections, preferably via a valve, particularly preferably a 5- 2-way switching valve, alternating with a common drain guide having the pressure control device can be connected.

According to a further preferred embodiment, the valve is designed as a filling valve for providing and interrupting a filling product flow from the filling element. As a result, a filling product can be provided, controlled / regulated and interrupted from the filling element to a container to be filled.

According to a further preferred embodiment, the valve is designed as a diaphragm valve or throttle valve for setting a passage cross section of a filling product line of the filling element. A volume flow of filling product in the filling element can thereby be controlled / regulated.

In a further preferred embodiment, the residual pressure set by the pressure control device is changed in relation to the position of the piston in the working cylinder along its longitudinal axis, so that, for example, near the end switch positions, the differential pressure between the pressure supply side and the side from which actuating fluid is discharged via the pressure control device , is low, and a higher pressure difference is set between these end positions and the piston moves correspondingly faster. In this way, for example, a kind of "stop damping" can be provided for the end positions.

The above object is further achieved by a method for controlling a filling element for filling a filling product into a container with the features of claim 11. Advantageous further developments of the method result from the present description, the subclaims and the figures.

Accordingly, a method for controlling a filling element for filling a filling product into a container is proposed, comprising the steps of applying an actuating fluid to a first chamber of a working cylinder of a valve of the filling element to achieve a first switching position of the valve, and draining the actuating fluid via a pressure control device for reaching a second switching position of the valve.

A switching speed of the valve can preferably be controlled / regulated individually by setting a pressure using the pressure regulating device.

The advantages and effects described with regard to the filling element are achieved analogously by the method.

list of figures

• 1 schematisch ein Ventil mitsamt Arbeitszylinder eines Füllorgans;
• 2 schematisch einen Schaltplan eines Füllorgans gemäß einer ersten Ausführungsform;
• 3 schematisch einen Schaltplan eines Füllorgans gemäß einer zweiten Ausführungsform;
• 4 schematisch einen Schaltplan eines Füllorgans gemäß einer dritten Ausführungsform;
• 5 schematisch einen Schaltplan eines Füllorgans gemäß einer vierten Ausführungsform;
• 6 schematisch einen Schaltplan eines Füllorgans gemäß einer fünften Ausführungsform; und
• 7 schematisch einen Schaltplan eines Füllorgans gemäß einer sechsten Ausführungsform.

Preferred further embodiments of the invention are explained in more detail by the following description of the figures. Show:

• 1 schematically a valve together with the cylinder of a filling element;
• 2 schematically shows a circuit diagram of a filling element according to a first embodiment;
• 3 schematically shows a circuit diagram of a filling element according to a second embodiment;
• 4 schematically shows a circuit diagram of a filling element according to a third embodiment;
• 5 schematically shows a circuit diagram of a filling element according to a fourth embodiment;
• 6 schematically shows a circuit diagram of a filling element according to a fifth embodiment; and
• 7 schematically shows a circuit diagram of a filling element according to a sixth embodiment.

Detailed description of preferred embodiments

Preferred exemplary embodiments are described below with reference to the figures. Identical, similar or equivalent elements in the different figures are provided with identical reference numerals, and a repeated description of these elements is partially omitted in order to avoid redundancies.

In 1 is schematically a filling element 1 for filling a filling product into a container with a valve 2 for influencing a filling product flow of the filling product flowing into the container, preferably for filling sauce into bottles.

The filler 1 has a working cylinder 20 by means of which the valve 2 can be switched. The working cylinder 20 is switchable via an actuating fluid, in the present case in the form of compressed air. For this purpose, the working cylinder 20 a piston 21 on which an interior of the working cylinder 20 into a first chamber 23 and into a second chamber 24 divided. The working cylinder 20 is designed as a double-acting pneumatic cylinder. Alternatively, the working cylinder 20 also be single-acting and / or designed as a single-acting or double-acting hydraulic cylinder.

The valve 2 is designed as a shut-off jet valve. Alternatively, the valve 2 also have a different shape and be designed, for example, as a diaphragm valve or throttle valve for varying the fill product flow.

The switch positions of the valve 2 are about the switching position of the working cylinder 20 predetermined. This is the piston 21 via a piston rod 22 with a valve cone 25 of the valve 2 connected, which is in the longitudinal direction of the valve 2 about the movement of the piston 21 is mobile. In a closed switching position of the valve 2 is the valve cone 25 in contact with a valve seat 26 , The valve plug opens 25 by moving the piston 21 from the valve seat 26 lifted out so that a corresponding passage cross-section or annular gap between the valve cone 25 and valve seat 26 arises, through which the filling product can flow. By lowering the valve cone 25 in the valve seat 26 in and by lifting out of this can be controlled according to the fill product flow.

2 shows schematically a circuit diagram of a filling element 1 according to a first embodiment. The filling element has a valve 2 with a working cylinder 20 corresponding 1 on.

Both chambers 23 . 24 of the double-acting cylinder 20 are each via a 3/2-way valve 5 with compressed air from a compressed air supply 4 provided. For this, the compressed air supply branches 4 parallel to the two 3/2-way valves 5 on. One of the 3/2-way valves 5 leads over a connecting line 27 to the first chamber 23 of the working cylinder 20 , The other of the two 3/2-way valves 5 leads via an OR valve 30 into a connecting line 28 to the second chamber 24 of the double-acting cylinder 20 ,

The OR valve 30 is in the form of a quick exhaust valve based on a normal OR valve, which is combined with a venting function for venting into the environment.

Via the Oder valve 30 is the connecting line 28 further with a pressure control device 3 connected. This has a buffer 32 and a proportional control valve 31 on. The pressure control device 3 is designed so that the actuating fluid from the working cylinder 20 can be dissipated such that a switching speed, in the present case a closing speed, of the valve 2 by setting a (counter) pressure by the pressure control device 3 can be individually controlled / regulated.

In 2 the switching valves are shown 5 switched so that the second chamber 24 Compressed air, for example with a pressure of 6 bar, is fed and the first chamber 23 through an exhaust air 7 is directly connected to the environment so that the air from the second chamber 23 can be drained essentially unthrottled. The piston 21 lies on the first side towards the first chamber 23 and therefore the valve is stopped 2 in a first switching position, which in the present case is an open position of the valve 2 equivalent.

Around the working cylinder 20 and with it the valve 2 The switching valves are brought into the other switching position 5 brought in their other switching position, so that then the first chamber 23 unthrottled with compressed air, for example again with a pressure of 6 bar, is supplied, and the second chamber 24 via the OR valve 30 the pressure control device 3 with the buffer 32 and then in series with the proportional control valve 31 connected is.

The pressure in the supply line 28 and thus in the second chamber 24 is via the proportional control valve 31 at a predetermined level, for example a pressure of 4 cash, held. The buffer 32 serves to support the pressure control.

The control of the switching speed at which the piston 21 and thus the valve cone 25 moves, takes place by adjusting the residual pressure or the remaining back pressure in the second chamber 24 through the pressure control device 3 instead of being the first chamber 23 , which acts as the closing stroke side in this switching position, compressed air unrestricted via the one 3/2-way valve 5 is fed.

The exhaust air from the second chamber 24 which is accordingly the opening stroke side of the double-acting working cylinder 20 corresponds, is consequently in the pressure-controlled back pressure channel via the pressure control device 3 dissipated. The higher that through the pressure control device 3 set back pressure and consequently the lower the pressure difference between the first chamber 23 and the second camera 24 , the lower the switching speed, here the closing speed, of the working cylinder 20 , and thus the closing speed of the valve 2 ,

Around the working cylinder 20 and thus the valve 2 back into the in 2 To move the switch position shown, the 3/2-way valves must 5 back to the in 2 shown position can be moved. The movement of the piston 21 then takes place unregulated, since the connecting line 27 directly with the exhaust air 7 is connected and the connecting line 28 directly with the compressed air supply 4 connected is. The movement of the working cylinder will thus take place at a higher speed than in the opposite movement, in which the piston is moved against the counter pressure or residual pressure.

In 3 is a schematic diagram of a filling element 1 shown according to a second embodiment. The filler 1 again has a valve 2 corresponding 1 on.

In this second embodiment, a 5/2-way valve supplies 6 both chambers 23 . 24 of the double-acting cylinder 20 , when closing the valve 2 the exhaust air from the second chamber 24 again in one by means of a pressure control device 3 , comprising a proportional control valve 31 and a buffer 32 , pressure-controlled duct is discharged. The closing speed becomes like too 2 described by means of the pressure control device 3 set back pressure individually set and controlled / regulated, whereas the control and the exhaust air duct of the first chamber 23 as well as loading the chamber side 24 with compressed air to open the valve 2 not throttled via the 5/2-way valve 6 be implemented.

4 shows schematically a circuit diagram of a filling element 1 according to a third embodiment. Here are both the first chamber 23 as well as the second chamber 24 each with its own pressure control device 3 connected as specifically with regard to 2 for the second chamber 24 is described.

In this third embodiment, an exhaust air duct of both chambers 23 . 24 of the double-acting cylinder 20 over one over each one proportional control valve 31 the respective pressure control device 3 provided pressure-controlled exhaust air duct with one buffer each 32 enables the control air for both chambers 23 . 24 each with a 3/2-way valve 5 supplied and the exhaust air via an OR valve 30 one each via the respective pressure control device 3 provided pressure-controlled channel is discharged. Depending on the backpressures set for each return air duct, this version allows individual control of the valve piston speed both on the opening side and on the closing side.

Because two pressure regulators 3 are provided, the residual pressure when the pressure is discharged from the first chamber 23 and the residual pressure as the pressure is released from the second chamber 24 can be specified independently of each other. Therefore, the control effort is very low in this embodiment. However, individual opening and closing speeds can be provided.

5 shows schematically a circuit diagram of a filling element 1 according to a fourth embodiment, in which the exhaust air duct of both chambers 23 . 24 each via a separate pressure control device 3 takes place, however, the exposure to compressed air of both chambers 23 . 24 via a common 5/2-way valve 6 and a common compressed air supply 4 which, depending on the switching position of the 5/2-way valve, either with the first chamber 23 or the second chamber 24 connected, takes place.

6 shows schematically a circuit diagram of a filling element 1 according to a fifth embodiment. The filler 1 essentially has the structure of the filling member according to the first embodiment, how to 1 describe on.

In contrast to the first embodiment, the working cylinder 20 in the fifth embodiment as a single-acting cylinder 20 formed, the first chamber 23 a feather 8th has and is actuated accordingly spring force. The working cylinder 20 and accordingly the valve 2 are therefore designed to open compressed air and close by spring force. After loading the second chamber 24 with actuating fluid, the latter after the 3/2-way valve 5 in the in 6 shown switching position was switched, again in turn via the pressure control device 3 from the second chamber 24 via the connecting line 28 , the OR valve 30 , the buffer 32 and the proportional control valve 31 to the exhaust air 7 dissipated, again via the proportional control valve 31 the residual pressure in the chamber side 24 of the working cylinder 20 is set to a predetermined value.

This is due to the proportional control valve 31 set value depending on a position of the piston 21 in the working cylinder 20 , Because the spring force of the spring 8th on the piston 21 with increasing distance of the piston 21 from the first chamber 23 becomes weaker, the residual pressure in the second chamber 24 via the pressure control device 3 adjusted accordingly so that the piston 21 moves to the closed position at a substantially constant speed.

7 schematically shows a circuit diagram of a filling element according to a sixth embodiment, which essentially corresponds to the fifth embodiment, but the working cylinder is designed to be spring-closing and compressed air-closing. Accordingly, in the sixth embodiment, an opening switching speed can be made via the pressure control device 3 can be set individually.

As far as applicable, all individual features that are shown in the exemplary embodiments can be combined with one another and / or exchanged without leaving the scope of the invention.

LIST OF REFERENCE NUMBERS

1

Filling head

2

Valve

20

working cylinder

21

piston

22

piston rod

23

First chamber

24

Second chamber

25

shuttle

26

valve seat

27

connecting line

28

connecting line

3

Pressure control device

30

Or valve

31

Proportional control valve

32

buffer

4

Compressed air supply

5

3/2-way valve

6

5/2-way valve

7

exhaust duct

8th

feather

Claims (12)

Filling element (1) for filling a filling product into a container, preferably for filling sauces into bottles, comprising a valve (2) for influencing a filling product flow, and a working cylinder (20) which can be switched via an actuating fluid for specifying the switching positions of the valve (2) , characterized in that a pressure control device (3) is provided, via which the actuating fluid can be removed from the working cylinder (20) in a controlled manner. Filling device (1) according to Claim 1 , characterized in that a switching speed, preferably an opening speed and / or a closing speed, of the valve (2) can be individually controlled / regulated by the pressure control device (3). Filling device (1) according to Claim 1 or 2 , characterized in that the supply of actuating fluid supplied to the working cylinder (20) is unthrottled. Filling element (1) according to one of the preceding claims, characterized in that the pressure control device (3) has a control valve, preferably a proportional control valve (31). Filling element (1) according to one of the preceding claims, characterized in that the pressure control device (3) has a buffer store (32) for buffering actuating fluid, the buffer store (32) preferably being arranged between the working cylinder (20) and the control valve. Filling element (1) according to one of the preceding claims, characterized in that the working cylinder (20) is designed as a pneumatic cylinder, the actuating fluid preferably being compressed air. Filling element (1) according to one of the preceding claims, characterized in that the working cylinder (20) is a single-acting working cylinder (20), preferably a single-acting pneumatic cylinder. Filling element (1) according to one of the preceding claims, characterized in that the working cylinder (20) is a double-acting working cylinder (20), preferably a double-acting pneumatic cylinder. Filling device (1) according to Claim 8 , characterized in that the double-acting working cylinder (20) has two connections, each of the connections being connectable to a separate drain guide having a pressure control device (3), or the two connections, preferably via a valve, particularly preferably a 5-2- Directional switching valve (6), alternately with a common, the pressure control device (3) having drainage can be connected. Filling member (1) according to one of the preceding claims, characterized in that the valve (2) is designed as a filling valve for providing and interrupting a filling product flow from the filling member (1), or that the valve (2) as a diaphragm valve or throttle valve for adjusting a Passage cross section of a filling product line of the filling member (1) is formed. Method for controlling a filling device (1) for filling a filling product into a container, comprising the following steps: - Actuation of a first chamber (23) of a working cylinder (20) of a valve (2) of the filling member (1) with an actuating fluid to achieve a first switching position of the valve (2); and - Removing the actuating fluid via a pressure control device (3) to achieve a second switching position of the valve (2). Procedure according to Claim 11 , characterized in that a switching speed of the valve (2) by an adjustment of a pressure by the pressure control device (3) is controlled / regulated individually.

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