DE102018110850A1 - Pressure adjustment device for a hydraulic fluid - Google Patents

Abstract

The invention relates to a pressure adjusting device for a hydraulic fluid, comprising an electrically controllable valve, which has an internal fluid reservoir and is adapted to provide a hydraulic actuator pressurized hydraulic fluid, and a locking device, which is arranged in a blocking state, a reduction and / or Increasing the pressure level of the hydraulic actuator provided hydraulic fluid regardless of the control of the electrically controllable valve to prevent, wherein the Druckeinstelleinrichtung is adapted to heat the internal liquid reservoir of the electrically controllable valve, while the locking device is in the locked state.

Description

The invention relates to a pressure adjusting device for a hydraulic fluid according to the preamble of patent claim 1, a device for adjusting the inclination of a distributor linkage of an agricultural utility vehicle according to the preamble of patent claim 6, an agricultural utility vehicle according to the preamble of patent claim 9 and a method for adjusting the inclination of Distributor linkage of an agricultural utility vehicle according to the preamble of claim 10.

Some agricultural vehicles, such as field sprayers, have a manifold linkage, wherein the inclination of the linkage linkage is adjustable with a hydraulic actuator. At the manifold linkage usually more Ausbringelemente, such as spray nozzles, arranged over which material, such as fertilizers, pesticides and / or seeds, can be applied to an agricultural area. For efficient application of the material, the distance between the distribution linkage and the ground must be kept as constant as possible over the entire working width, so that the most precise possible adjustment of the inclination of the distribution linkage before and / or during the Ausbringvorgangs has to be done.

An agricultural machine with a corresponding distributor linkage is for example from the document WO 2016/120181 A1 known.

The pressure adjusting devices used to adjust the pressure level of the hydraulic fluid provided to the hydraulic actuator usually have an electrically controllable valve which has an internal fluid reservoir. The viscosity state of the liquid within the liquid reservoir influences the operation of the electrically controllable valve to a considerable extent. It has been found that a precise controllability of corresponding valves at low ambient temperatures can not be guaranteed due to the high viscosity of the liquid present in the liquid reservoir. This is due to the fact that moving parts of the electrically controllable valve are not sufficiently agile and too slow to react due to the high viscosity of the liquid in the liquid reservoir. This can lead to uncontrolled and jerky rod movements when opening a downstream of the electrically controllable valve locking device. Such boom movements cause a considerable risk of damage and should be avoided to ensure safe commissioning of the agricultural vehicle even at low ambient temperatures.

The object underlying the invention is thus to prevent or at least reduce unintended pressure changes in systems with electrically controllable valves which have a liquid reservoir.

The object is achieved by a pressure adjusting device of the aforementioned type, wherein the pressure adjusting device according to the invention is adapted to heat the internal fluid reservoir of the electrically controllable valve, while the locking device is in the locked state.

The invention makes use of the knowledge that unintended pressure changes can be effectively avoided by pre-tempering the internal liquid reservoir. By pre-tempering the liquid reservoir is heated, whereby the viscosity of the liquid is reduced in the liquid reservoir. Due to the reduced viscosity, the inertia of parts of the electrically controllable valve, which are arranged in the liquid reservoir, significantly reduced, whereby the response of the electrically controllable valve is improved. Due to the set blocking state of the locking device does not occur during the warm-up process to a reduction and / or increase of the set pressure level of the hydraulic actuator provided hydraulic fluid. As soon as a suitable viscosity state of the liquid within the liquid reservoir has been set by the heating of the liquid reservoir, the blocking device can be opened so that a reduction and / or increase in the pressure level of the hydraulic fluid provided to the hydraulic actuator can also be implemented.

In particular, the hydraulic actuator to a movable actuator, such as a piston, wherein the locking device may be configured in the blocking state to prevent movement of the actuator of the hydraulic actuator entirely or at least in a direction of movement independently of the control of the electrically controllable valve. In particular, the prevention of the movement of the actuator of the hydraulic actuator can also be independent of the pressure level of the hydraulic actuator provided hydraulic fluid, for example by a mechanical locking of the hydraulic actuator, in particular by a mechanical locking of the movable actuator or a component connected to the mechanical actuator. The internal fluid reservoir is preferably an internal hydraulic oil reservoir. In particular, the liquid in the liquid reservoir is designed as hydraulic oil.

In a further embodiment of the pressure adjusting device according to the invention, the electrically controllable valve is designed as a solenoid-actuated valve, in particular as a solenoid-operated pressure control valve. In particular, the electrically controllable valve has a magnetic coil for moving a magnet armature, wherein heating of the internal liquid reservoir can be caused by energizing the magnet coil. Preferably, the magnetic coil of the electrically controllable valve is heat-transmitting coupled to the internal liquid reservoir. In the blocking state, the blocking device is preferably designed to prevent a reduction in the pressure level of the hydraulic fluid provided to the hydraulic actuator independently of the energization of the magnetic coil. Alternatively or additionally, the blocking device in the blocking state can be set up to prevent an increase in the pressure level of the hydraulic fluid provided to the hydraulic actuator independently of the current supply to the solenoid coil. Thus, the control state of the hydraulic actuator is not changed by energizing the solenoid, as long as the locking device is in the locked state. When the locking device is opened, the pressure level of the hydraulic fluid provided to the hydraulic actuator can be freely adjusted by energizing the solenoid.

In a further development, the pressure adjusting device according to the invention has a control device which is adapted to control the electrically controllable valve and the locking device and to energize the solenoid of the electrically controllable valve for heating the liquid reservoir of the electrically controllable valve, while the locking device in the locked state located. By energizing the solenoid coil is heated. Due to the heating of the magnetic coil, there is also a heating of the environment of the magnetic coil and thus ultimately also to a heating of the arranged in the vicinity of the magnetic coil liquid reservoir. The controller may be further configured to energize the solenoid for a preheat period during which the latch is in the off state. The preheating period can be a predefined period of time. Alternatively, the preheating period may also be dependent on the ambient temperature, the temperature in the region of the liquid reservoir or on the viscosity state of the liquid within the internal liquid reservoir.

In addition, a Druckeinstelleinrichtung invention is advantageous in which the armature of the electrically controllable valve is disposed within the internal liquid reservoir of the electrically controllable valve and / or the internal liquid reservoir of the electrically controllable valve is at least partially surrounded by the magnetic coil of the electrically controllable valve. If the magnet armature of the electrically controllable valve is arranged within the internal fluid reservoir of the electrically controllable valve, the heating of the internal fluid reservoir considerably increases the agility of the magnet armature, which ultimately improves the response of the electrically actuatable valve. If the internal liquid reservoir of the electrically controllable valve is at least partially surrounded by the magnetic coil of the electrically controllable valve, the heat exchange between the solenoid and the liquid reservoir is increased, so that a rapid heating of the liquid reservoir is achieved after initiation of the energization of the solenoid of the electrically controllable valve. The internal liquid reservoir is preferably arranged within a pole tube of the electrically controllable valve.

In a further development of the pressure adjusting device according to the invention, the blocking device comprises a check valve, which is preferably arranged between the electrically controllable valve and the hydraulic actuator. By the check valve, a flow of hydraulic fluid from the electrically controllable valve to the check valve and / or from the check valve to the electrically controllable valve can be avoided when the lock device is in the locked state.

Alternatively or additionally, the blocking device may have an at least partially disposed within the electrically controllable valve lock body, which in the blocking state of the locking device directly prevents movement of the armature or a magnet armature connected to the part. In particular, the prevention of the movement of the armature or of the armature connected to the part can also be independent of the pressure level of the hydraulic actuator provided hydraulic fluid, for example by a mechanical locking of the armature or connected to the armature part.

The object underlying the invention is further achieved by a device of the type mentioned above, wherein the one or more pressure-adjusting devices of the device according to the invention according to one of the above are formed described embodiments. With regard to the advantages and modifications of the device according to the invention for adjusting the inclination of the distributor linkage, reference is first made to the advantages and modifications of the pressure adjusting device according to the invention for a hydraulic fluid.

The device according to the invention can be used for example in an agricultural utility vehicle designed as a field sprayer. The hydraulic actuator may be formed, for example, as a hydraulic cylinder. In particular, the hydraulic actuator is designed as a double-acting hydraulic cylinder, wherein the double-acting hydraulic cylinder is preferably coupled to two pressure setting devices. For example, a first pressure adjusting device is configured to adjust the hydraulic pressure in a first chamber of the double-acting hydraulic cylinder, and a second pressure adjusting device is configured to adjust the hydraulic pressure in a second chamber of the double-acting hydraulic cylinder.

In particular, the hydraulic actuator to a movable actuator, such as a piston, wherein the locking device is at least one Druckeinstelleinrichtung configured in the blocking state to prevent movement of the actuator of the hydraulic actuator regardless of the control of the electrically controllable valve of at least one pressure adjustment. In particular, the prevention of the movement of the actuator of the hydraulic actuator can also be independent of the pressure level of the hydraulic actuator provided hydraulic fluid, for example by a mechanical locking of the hydraulic actuator, in particular by a mechanical locking of the movable actuator or a component connected to the mechanical actuator.

In a refinement of the device according to the invention, the latter has a data memory on which initial target pressure values or electrical control signals associated with the initial target pressure values are stored for different states, in particular folding states, of the distributor linkage, wherein the one or more pressure setting devices are adapted to the initial target pressure values from the present state, in particular folded state, of the distributor linkage to adjust the hydraulic actuator. The desired pressure value assigned to the current state, in particular the folded state, of the distributor linkage can be set, for example, before the barrier device is opened. Due to the preheating of the liquid reservoir, even at low ambient temperatures, there is no unintentional movement of the bar when the blocking device is opened.

The object underlying the invention is further achieved by an agricultural vehicle of the type mentioned above, wherein the device for adjusting the inclination of the distributor linkage of the agricultural utility vehicle according to the invention is designed according to one of the embodiments described above. With regard to the advantages and modifications of the agricultural utility vehicle according to the invention, reference is thus made to the advantages and modifications of the device according to the invention for adjusting the inclination of the distributor linkage.

The object underlying the invention is further achieved by a method of the type mentioned, wherein the inventive method, the heating of the internal liquid reservoir of the electrically controllable valve while preventing the reduction and / or increase of the set pressure level of the hydraulic fluid for the hydraulic actuator of the agricultural vehicle includes. The agricultural utility vehicle may be, for example, a field sprayer. In particular, the hydraulic actuator comprises a movable actuator, for example a piston, the method comprising preventing the movement of the actuator of the hydraulic actuator independently of the control of the electrically controllable valve by means of the locking device. In particular, the prevention of the movement of the actuator of the hydraulic actuator can also be independent of the pressure level of the hydraulic actuator provided hydraulic fluid, for example by a mechanical locking of the hydraulic actuator, in particular by a mechanical locking of the movable actuator or a component connected to the mechanical actuator.

The method according to the invention is further developed in that the heating of the internal liquid reservoir of the electrically controllable valve during the prevention of reduction and / or increase of the set pressure level of the hydraulic fluid for the hydraulic actuator of the agricultural vehicle comprises energizing a solenoid of the electrically controllable valve, wherein the energizing is performed such that the heating of the internal liquid reservoir is caused by a heating of the magnetic coil. The heating of the internal liquid reservoir of the electrically controllable valve while preventing the reduction and / or increase of the set pressure level of the hydraulic fluid for the hydraulic actuator of the agricultural utility vehicle can be initiated, for example by a user input to an operating device, in particular a control terminal of the agricultural utility vehicle. Furthermore, the heating of the internal liquid reservoir while simultaneously preventing the pressure level reduction and / or pressure level increase of the hydraulic fluid provided to the hydraulic actuator can be carried out automatically as a function of a detected temperature, in particular the detected outside temperature. Furthermore, the heating of the internal liquid reservoir during the prevention of the pressure level reduction and / or the pressure level increase of the hydraulic actuator provided hydraulic fluid can be initiated automatically when the distribution linkage of the agricultural utility vehicle is unfolded.

In a particularly preferred embodiment of the method according to the invention this is carried out using a device for adjusting the inclination of a distribution linkage of an agricultural utility vehicle according to one of the embodiments described above and / or by an agricultural utility vehicle according to one of the embodiments described above. With regard to the advantages and modifications of such a method, reference is made to the advantages and modifications of the device according to the invention for adjusting the inclination of a distribution linkage of an agricultural utility vehicle and the advantages and modifications of the agricultural utility vehicle according to the invention.

• 1 ein Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung zum Einstellen der Neigung eines Verteilergestänges eines landwirtschaftlichen Nutzfahrzeugs in einer schematischen Darstellung; und
• 2 ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung zum Einstellen der Neigung eines Verteilergestänges eines landwirtschaftlichen Nutzfahrzeugs in einer schematischen Darstellung.

Hereinafter, preferred embodiments of the invention will be described and described with reference to the accompanying drawings. Showing:

• 1 An embodiment of an inventive device for adjusting the inclination of a distribution linkage of an agricultural utility vehicle in a schematic representation; and
• 2 a further embodiment of a device according to the invention for adjusting the inclination of a distribution linkage of an agricultural utility vehicle in a schematic representation.

The 1 shows a device 100 for adjusting the inclination of a distribution linkage 200 an agricultural utility vehicle, such as a field sprayer.

The distribution linkage 200 is so on a rotatably mounted and height adjustable frame 116 the device 100 hung that inclination of the distributor linkage 200 is changeable. At the distribution linkage 200 For example, application elements may be fastened to dispense material, such as fertilizers, pesticides or seeds.

The distribution linkage 200 has a central boom segment 202 on. The central boom segment 202 is about a joint 206a with the lateral rod segment 204a and about a joint 206b with the lateral rod segment 204b connected. The lateral rod segments 204a . 204b can be connected via other joints with other rod segments. About the joints 206a . 206b between the boom segments 202 . 204a . 204b is the distribution linkage 200 retractable. Between adjacent boom segments 202 . 204a . 204b is each a sensor 208a . 208b arranged, using the sensors 208a . 208b the folded state of the linkage 200 can be detected.

The device 100 includes two pressure adjustment devices 10a . 10b for a hydraulic fluid and a hydraulic actuator 102 , The hydraulic actuator 102 is via lines 104a . 104b fluid-conducting with the Druckeinstelleinrichtungen 10a . 10b connected. The hydraulic actuator 102 is designed as a double-acting hydraulic cylinder and has two chambers 106a . 106b for hydraulic fluid. Between the chambers 106a . 106b is designed as a piston and the hydraulic pressure in the chambers 106a . 106b movable actuator 108 arranged. With the actuator 108 are formed as piston rods actuators 110a . 110b connected, wherein the actuator 110a through the chamber 106a and the actuator 110b through the chamber 106b extends. The housing 114 of the hydraulic actuator 102 is at the central boom segment 202 of the manifold linkage 200 hinged. The actuator 110b is on the frame 116 hinged. During a movement of the actuator 108 caused by a change in the hydraulic pressure in the chambers 106a . 106b is feasible, it is due to the method of the actuator 110b to a change in the inclination of the manifold linkage 200 ,

The pressure adjustment device 10a is over the line 104a with the chamber 106a of the hydraulic actuator 102 connected. The pressure adjustment device 10b is over the line 104b with the chamber 106b of the hydraulic actuator 102 connected. Both pressure adjustment devices 10a . 10b are also with a common pump designed as a conveyor 112 connected for the hydraulic fluid.

The pressure adjusting devices 10a . 10b each have an electrically controllable valve 12a . 12b and a locking device 14a . 14b on. About the electrically controllable valves 12a . 12b can the hydraulic actuator 102 over the wires 104a . 104b pressurized hydraulic fluid can be provided. The locking devices 14a . 14b each have a check valve designed as a check valve and can be switched between a blocking state and an open release state. When the locking devices 14a . 14b are in the blocking state, the flow of hydraulic fluid from the hydraulic actuator 102 to the locking devices 14a . 14b avoided, so that a reduction in the pressure level of the hydraulic actuator 102 provided hydraulic fluid regardless of the control of the electrically controllable valves 12a . 12b is prevented. However, the locking devices allow 14a . 14b in the off state, a flow of hydraulic fluid from the locking devices 14a . 14b in the direction of the hydraulic actuator 102 , Thus, prevent the locking devices 14a . 14b in the blocking state, a movement of the actuator 108 of the hydraulic actuator 102 independent of the control of the electrically controllable valves 12a . 12b , This allows energization of the electrically controllable valves 12a . 12b without affecting the inclination of the distribution linkage 200 changes.

The device 100 can also have a data memory on which for different states of the manifold boom folding conditions 200 initial setpoint pressure values are stored, the pressure setting devices 10a . 10b are adapted to the initial target pressure values depending on the present state of collapse of the manifold linkage 200 on the hydraulic actuator 102 adjust.

The electrically controllable valves 12a . 12b are designed as solenoid-operated pressure control valve and each have an internal fluid reservoir 18 on. The viscosity of the liquid in the liquid reservoir 18 influences the operational and in particular the response of the electrically controllable valves 12a . 12b , At low ambient temperatures, that in the liquid reservoir 18 Liquid present a comparatively high viscosity, whereby the agility of moving parts within the liquid reservoir 18 would be affected. The electrically controllable valves 12a . 12b So would without prior warming in the liquid reservoir 18 liquid in the commissioning of the agricultural vehicle accidental pressure fluctuations in the chambers 106a . 106b cause uncontrolled boom movements. Such linkage movements cause a considerable risk of damage to the agricultural utility vehicle. To prevent or at least reduce uncontrolled boom movements are the pressure adjustment devices 10a . 10b set up the internal fluid reservoir 18 their respective electrically controllable valve 12a . 12b to warm up, while the locking device 14a . 14b is in the locked state. Due to the set blocking state of the locking devices 14a . 14b During the warm-up process, there is no reduction in the set pressure level of the hydraulic fluid, so that movement of the actuator 108 of the hydraulic actuator 102 and thus a rod movement is prevented. Once the liquid reservoirs 18 the electrically controllable valves 12a . 12b of the devices 10a . 10b Preheated to a suitable temperature, the locking devices 14a . 14b be opened. Due to the reduced viscosity, the response of the electrically controllable valves 14a . 14b greatly improved and setting inadvertent pressures in the chambers 106a . 106b is effectively avoided due to the preheating of the liquid reservoirs. The internal fluid reservoirs 18 are for example internal hydraulic oil reservoirs.

That in the 2 illustrated embodiment of the device 100 for adjusting the inclination of a distribution linkage 200 an agricultural utility vehicle has a pressure adjustment device 10 for a hydraulic fluid and a hydraulic actuator 102 on. The hydraulic actuator 102 is with the pressure adjusting device 10 connected and adapted to the inclination of a distribution linkage 200 of the agricultural vehicle.

The pressure adjustment device 10 has an electrically controllable valve 12 and a locking device 14 on.

The electrically controllable valve 12 is designed as a solenoid-operated pressure control valve and has an internal fluid reservoir 18 on. About the electrically controllable valve can the hydraulic actuator 102 be provided a pressurized hydraulic fluid. In addition, the electrically controllable valve has a housing 26 and a lid 28 on.

The locking device 14 has a check valve and can be switched between an open enable state and a disable state. In the locked state, a reduction in the pressure level of the hydraulic actuator 102 Provided hydraulic fluid regardless of the control of the electrically controllable valve 12 prevented.

The pressure adjustment device 10 also includes a controller 16 which signal-conducting with the electrically controllable valve 12 and the locking device 14 connected is. The control device may be the electrically controllable valve 12 and the locking device 14 so control that the internal fluid reservoir 18 of the electrically controllable valve 12 is heated, while the locking device 14 is in the locked state.

The electrically controllable valve 12 has one in the housing 26 arranged magnetic coil 20 for moving a magnet armature 22 on, by means of a current supply to the magnetic coil 20 heating the internal fluid reservoir 18 is causable. In the lock state of the locking device 14 is a reduction in the pressure level of the hydraulic actuator 102 provided hydraulic fluid regardless of the energization of the solenoid 20 prevented. The control device 16 can the electrically controllable valve 12 and the locking device 14 So control so that the solenoid 20 of the electrically controllable valve 12 for heating the internal fluid reservoir 18 is energized, while the locking device 14 is in the locked state. By the energization of the magnetic coil 20 this is heated so that it heats up the environment of the magnetic coil 20 and thus to a heating of the liquid reservoir 18 comes.

The magnet armature 22 of the electrically controllable valve 12 is inside the internal fluid reservoir 18 of the electrically controllable valve 12 is arranged. Further, the internal liquid reservoir becomes 18 of the electrically controllable valve 12 from the solenoid 20 of the electrically controllable valve 12 surround. In addition, the internal fluid reservoir 18 inside a pole tube 24 arranged. The pole tube 24 is sections of the housing 26 and on the housing 26 adjacent lid 28 surround.

LIST OF REFERENCE NUMBERS

10, 10a, 10b

pressure adjusting

12, 12a, 12b

electrically controllable valves

14, 14a, 14b

blocking devices

16

control device

18

liquid reservoir

20

solenoid

22

armature

24

pole tube

26

casing

28

cover

100

contraption

102

hydraulic actuator

104, 104a, 104b

cables

106a, 106b

chambers

108

actuator

110a, 110b

actuators

112

Conveyor

114

casing

116

frame

200

distributor tube assembly

202

pole section

204a, 204b

linkage segments

206a, 206b

joints

208a, 208b

sensors

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely 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.

Cited patent literature

• WO 2016/120181 A1 [0003]

Claims (12)

Pressure adjustment device (10, 10a, 10b) for a hydraulic fluid, comprising - an electrically controllable valve (12, 12a, 12b) which has an internal fluid reservoir (18) and is adapted to provide a hydraulic actuator (102) with a pressurized hydraulic fluid; and - a locking device (14, 14a, 14b), which is configured in a blocking state, a reduction and / or increase in the pressure level of the hydraulic actuator (102) provided hydraulic fluid independently of the control of the electrically controllable valve (12, 12a, 12b) to prevent; characterized in that the pressure adjusting means (10, 10a, 10b) is adapted to heat the internal fluid reservoir (18) of the electrically controllable valve (12, 12a, 12b), during which the locking means (14, 14a, 14b) in the Lock state is located. Pressure adjusting device (10, 10a, 10b) after Claim 1 , characterized in that the electrically controllable valve (12, 12a, 12b) as a solenoid-operated valve, in particular as a solenoid-operated pressure control valve is formed, which has a magnetic coil (20) for moving a magnet armature (22), wherein by means of a current supply of the magnetic coil ( 20) the heating of the internal liquid reservoir (18) is cause. Pressure adjusting device (10, 10a, 10b) after Claim 2 characterized by a control device (16) which is set up to control the electrically controllable valve (12, 12a, 12b) and the blocking device (14, 14a, 14b) and the magnetic coil (20) of the electrically controllable valve (12, 12a, 12b) for heating the internal liquid reservoir (18) of the electrically controllable valve (12, 12a, 12b) during which the blocking device (14, 14a, 14b) is in the blocking state. Pressure adjusting device (10, 10a, 10b) after Claim 2 or 3 , characterized in that the magnet armature (22) of the electrically controllable valve (12, 12a, 12b) within the internal liquid reservoir (18) of the electrically controllable valve (12, 12a, 12b) is arranged and / or the internal liquid reservoir (18) of the electrically controllable valve (12, 12a, 12b) is at least partially surrounded by the magnetic coil (20) of the electrically controllable valve (12, 12a, 12b). Pressure adjusting device (10, 10a, 10b) according to one of the preceding claims, characterized in that the locking device (14, 14a, 14b) comprises a check valve, which preferably between the electrically controllable valve (12, 12a, 12b) and the hydraulic actuator ( 102) is arranged. An apparatus (100) for adjusting the inclination of a distribution linkage (200) of an agricultural utility vehicle, comprising: - one or more hydraulic fluid pressure adjusters (10, 10a, 10b); and - a hydraulic actuator (102) connected to said one or more pressure adjusters (10, 10a, 10b) and adapted to adjust the incline of a utility rail (200) of the agricultural utility vehicle; characterized in that the one or more pressure adjusting means (10, 10a, 10b) are formed according to any one of the preceding claims. Device (100) according to Claim 6 characterized in that the hydraulic actuator (102) comprises a movable actuator (108), wherein the locking means (14, 14a, 14b) of at least one pressure adjusting means (10, 10a, 10b) is arranged in the locked state to control movement of the actuator (108) of the hydraulic actuator (102) wholly or at least in a direction of movement independently of the control of the electrically controllable valve (12, 12a, 12b) to prevent. Device (100) according to Claim 6 or 7 characterized by a data memory storing thereon initial target pressure values or electrical control signals associated with the initial target pressure values for different states, in particular folding states, of the manifold linkage (200), the one or more pressure setting devices (10, 10a, 10b) being adapted to to set the initial target pressure values as a function of the present state, in particular folded state, of the distributor linkage (200) on the hydraulic actuator (102). Agricultural utility vehicle, in particular field sprayer, comprising - a distribution linkage (200); and - a device (100) for adjusting the inclination of the distribution linkage (200); characterized in that the device (100) for adjusting the inclination of the distribution linkage (200) according to one of Claims 6 to 8th is trained. Method for adjusting the inclination of a distribution linkage (200) of an agricultural utility vehicle, comprising the steps of - providing a pressurized hydraulic fluid for a hydraulic actuator (102) of the agricultural utility vehicle by means of an electrically controllable valve (12, 12a, 12b) having an internal fluid reservoir (18 ); - Preventing a reduction and / or increase of the set pressure level of the hydraulic fluid for the hydraulic actuator (102) of the agricultural vehicle independently of the activation of the electrically controllable valve (12, 12a, 12b) by means of a locking device (14, 14a, 14b), and Adjusting the inclination of the manifold (200) by means of the hydraulic actuator (102); characterized by the step of: heating the internal liquid reservoir (18) of the electrically controllable valve (12, 12a, 12b) while preventing the reduction and / or increase of the adjusted hydraulic fluid pressure level for the hydraulic actuator (102) of the agricultural utility vehicle. Method according to Claim 10 characterized in that the heating of the internal fluid reservoir (18) of the electrically actuable valve (12, 12a, 12b) while preventing the reduction and / or increase of the adjusted hydraulic fluid pressure level for the hydraulic actuator (102) of the agricultural utility vehicle Step comprises: - energizing a solenoid (20) of the electrically controllable valve (12, 12a, 12b) such that the heating of the internal liquid reservoir is caused by a heating of the magnetic coil (20). Method according to Claim 10 or 11 characterized in that the method comprises using a device (100) for adjusting the inclination of a distribution linkage (200) of an agricultural utility vehicle according to any one of Claims 6 to 8th and / or by an agricultural utility vehicle Claim 9 is performed.

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