DE102016202304A1 - Directional control valve with electromagnetically actuated detent - Google Patents

Abstract

The invention relates to a directional control valve (10, 10 ') with a housing (20) in which a valve slide (30) is movably received in the direction of a longitudinal axis (11), wherein at least one first latching body (52) is provided, which is transverse to The longitudinal axis (11) is movable, wherein at least one first latching contour (53) in the direction of the longitudinal axis (11) fixedly connected to the valve slide (30), wherein an electromagnetic actuator (70) is provided, which with the at least one first latching body ( 52) is coupled.
According to the invention, an actuating body (80) which is movable in the direction of the longitudinal axis (11) is provided, which has a wedge surface (81) inclined to the longitudinal axis (11), which is motion-coupled to the at least one first detent body (52), wherein the actuating body (80) is coupled to the actuating device (70) such that an already performed engagement between the at least one first latching body (52) and a first latching contour (53) using the actuating device (70) can be canceled.

Description

The invention relates to a directional control valve according to the preamble of claim 1.

From the DE 39 23 743 A1 a directional control valve is known, which is intended for use in an agricultural tractor and which is provided with a locking device. The latching device comprises first latching body, which are accommodated in the valve slide, wherein the associated first latching contour is fixedly arranged on the housing of the directional control valve.

From the DE 10 2012 208 943 A1 is a directional control valve with a locking device known which is electromagnetically actuated. The first latching body is arranged on the housing, wherein the first latching contour is arranged on the valve slide. This locking device requires a lot of space.

From the EP 751 302 B1 is a directional control valve with a locking device known, which is electro-hydraulically actuated. This locking device is expensive.

An advantage of the present invention is that the locking device is simple and space-saving. The directional control valve according to the invention can also be used as a substitute for the from DE 39 23 743 A1 known directional control valve are used, which is intended for use in an agricultural tractor. Furthermore, a kick-out function can be implemented in a simple manner, for which, in addition to suitable programming of the control device, only a few mechanical components are required. If the kick-out function is not needed, the mentioned mechanical components can be easily omitted.

According to claim 1, it is proposed that an actuating body movable in the direction of the longitudinal axis is provided, which has a wedge surface inclined to the longitudinal axis, which is coupled in motion with the at least one first detent body, wherein the actuating body is coupled to the actuating device in such a way that an already effected engagement between the at least one first latching body and a first latching contour can be canceled using the actuating device.

The at least one first detent body is preferably a ball. The at least one first latching contour is preferably rotationally symmetrical with respect to the longitudinal axis. Preferably, a plurality of first latching body, most preferably three first latching body, are provided, which are arranged distributed uniformly over the circumference of the counter-locking contour. The engagement between the at least one first latching body and the at least one first latching contour can be designed such that it can be released by exceeding a predetermined actuating force which acts on the valve slide in the direction of the longitudinal axis. The wedge surface is preferably formed rotationally symmetrical with respect to the longitudinal axis, wherein it is most preferably formed as an inner cone. The longitudinal axis is preferably arranged in the center of the valve slide, wherein the valve slide is most preferably formed substantially rotationally symmetrical with respect to the longitudinal axis. The actuating body is preferably formed rotationally symmetrical with respect to the longitudinal axis. The actuating force of the electromagnetic actuating device is preferably continuously adjustable, wherein it is most preferably substantially proportional to a control voltage or to a control current. The actuating device preferably acts on the actuating body permanently with an actuating force, which is canceled only for a short time in order to release an already made detent.

In the dependent claims advantageous refinements and improvements of the invention are given.

It can be provided that the actuating device comprises a pole tube which is fixedly connected to the housing, wherein a coil is arranged around the pole tube and fixedly connected thereto, wherein the at least one first latching body, the at least one first latching contour and the actuating body are arranged within the pole tube. This results in a particularly space-saving actuator. In addition, the directional control valve can be particularly easily sealed against leakage of pressurized fluid. The pole tube is preferably made of a magnetically conductive material apart from a flow interruption section. Preferably, the pole tube limits at least in sections an interior of the directional control valve, which is closed in a fluid-tight manner. The pole tube and the housing are preferably formed separately from each other, so that they are easy to manufacture. However, it is conceivable to make the pole tube and the housing in one piece. The coil may be releasably or permanently connected to the pole tube.

It can be provided that within the pole tube a movable armature in the direction of the longitudinal axis is arranged, which is coupled to the actuating body such that an already made engagement between the at least one first latching body and a first latching contour can be canceled by means of the actuating device. A magnetic force can be exerted on the armature by applying current to the coil. The coupling between the anchor and the Actuator can be made in a particularly simple manner. Preferably, the magnetic force is transmitted by positive entrainment on the actuator body. The armature is preferably made of a magnetically conductive material.

It can be provided that the armature is movable in the direction of the longitudinal axis relative to the valve spool and relative to the housing. Preferably, the armature is not rotationally coupled with the valve spool such that movement of the valve spool does not substantially affect the movement of the armature.

It can be provided that the valve slide extends into the pole tube, wherein the at least one first latching contour is arranged directly on the valve slide. In this way, a defined relationship between the position of the first latching contours and the position of the relevant control positions of the directional control valve can be produced in a particularly simple manner. The valve spool is preferably formed in one piece. But it is also conceivable that the valve spool comprises two parts which are firmly connected to each other in the region of the connection point between the housing and the pole tube.

It can be provided that the armature is arranged in an annular manner around the valve slide. This results in a particularly space-saving directional control valve. The armature is preferably formed rotationally symmetrical with respect to the longitudinal axis.

It can be provided that a flow interruption body is arranged between the valve spool and the armature, which consists of a magnetically non-conductive material. The valve spool is preferably made of steel, so that it is magnetically conductive. On the one hand, the flow interruption body ensures that the magnetic flux concentrates in the pole tube and in the armature, whereby leakage flux in the valve slide is minimized. Furthermore, it is avoided that the armature by magnetic forces adhering to the valve spool. The flow interruption body is preferably tubular, wherein it surrounds the valve spool in an annular manner. The flow interruption body is preferably rotationally symmetrical with respect to the longitudinal axis. The flow interruption body is preferably formed separately from the armature and the actuating body. The flow interruption body preferably extends over the entire length of the anchor and, if desired, beyond.

It can be provided that the flow interruption body is movable in the direction of the longitudinal axis, wherein it is motion-coupled with the armature. The flow interruption body is preferably movable relative to the housing as well as relative to the valve spool. Preferably, the armature bears in the direction of the longitudinal axis directly on the flow interruption body. Thus, the magnetic force of the armature can be transmitted to the operating body via the flow interruption body. Preferably, a slight clearance is provided between the flow interruption body and the valve spool.

It can be provided that the at least one first latching body is received in a separate holding part, which is held between the housing and the pole tube. This simplifies the production of the directional control valve. In particular, the holding breakthrough for the at least one first locking body is easy to produce.

It can be provided that at least one second latching body is provided, which is movable transversely to the longitudinal axis, wherein it is held positively relative to the housing or relative to the valve spool in the direction of the longitudinal axis, at least one second locking contour in the direction of the longitudinal axis fixed to the valve spool or is firmly connected to the housing, wherein each second locking contour with the at least one second detent body is engageable such that the valve spool is held in an associated second detent position, wherein no coupling between the actuating device and the at least one second detent body is present , As a result, further locking positions are provided, the locking function is independent of the state of the actuator. Preferably, the second latching contours are firmly connected to the housing.

It can be provided that the at least one second latching contour is arranged directly on the holding part. The at least one second latching body is preferably arranged in the valve slide. Such a directional control valve is easy to manufacture and very space-saving.

It can be provided at least one position detection means with which the relative position between the valve spool and the housing can be measured. Preferably, the position detecting means comprises a switching device, wherein for each first detent position, a switching contour is provided, which is fixedly connected to the valve spool and with which the switching device is actuated. The switching device may be a mechanical switch or a capacitive or an inductive proximity switch. But it is also conceivable that the position detection means continuously measures the movement path of the valve spool.

A pressure sensor may be provided with which a load pressure at the directional control valve can be measured, wherein a control device is provided, to which the actuating device and the pressure sensor are connected, wherein the control device is configured to intervene between the at least one first detent body and a first locking contour using the actuator cancel when said load pressure exceeds a predetermined value. In this way, a kick-out function can be realized in a simple manner, in which the detent is automatically released when the actuator connected to the directional control valve moves against a stop or into an end position. The valve spool is then preferably moved by a return spring in a control position in which the actuator stops moving.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the present invention.

The invention will be explained in more detail below with reference to the accompanying drawings. It shows:

1 a circuit diagram of a first embodiment of a directional control valve according to the invention;

2 a longitudinal section of the directional control valve 1 ;

3 a circuit diagram of a second embodiment of a directional control valve according to the invention; and

4 a longitudinal section of the directional control valve 3 ,

1 shows a circuit diagram of a first embodiment of a directional control valve according to the invention 10 , The directional valve 10 is for example intended for use in a valve block of an agricultural tractor, being part of an open hydraulic circuit. Accordingly, pressurized fluid from a pump 120 from a tank 121 sucked and under pressure to the directional control valve 10 promoted. The pressurized fluid is preferably a liquid and most preferably hydraulic oil. To the first and second work connection 13 ; 14 of the directional valve 10 a (not shown) actuator is connected, which is designed for example as a hydraulic cylinder and its direction of movement and speed with the directional control valve 10 can be adjusted. This has the directional control valve 10 a total of four switch positions 31 ; 32 ; 33 ; 34 , In the first switching position 31 are the first and the second work connection 13 ; 14 locked, so that said actuator is immovably hydraulically clamped. By means of the return springs 35 becomes the directional valve 10 in the first switching position 31 biased. The pump 120 , which preferably has an adjustable displacement volume, promotes against a closed slide. The connection line 15 is to the tank 121 depressurized. It should be noted that all tank symbols in 1 the same tank 121 describe.

In the second switching position 32 promotes the pump 120 the pressurized fluid to the first working port 13 , Which from the actuator to the second working port 14 returning pressurized fluid into the tank 121 flows. In the third shift position 33 promotes the pump 120 the pressurized fluid to the second working port 14 , From the actuator to the first working port 13 returning pressurized fluid into the tank 121 flows. Both in the second and in the third switching position 32 ; 33 the pressurized fluid is discharged from the pump 120 via an optional pressure compensator 124 , continue via an optional check valve 125 , continue over a continuously adjustable aperture 12 and continue via a connecting line 15 directed. The continuously adjustable aperture 12 is from the valve spool (no. 30 in 2 ) of the directional control valve 10 formed, with their free cross section, the speed of movement of the directional control valve 10 connected actuator determined. By means of the pressure balance 124 is the pressure gradient at the aperture 12 adjusted to a predetermined value. The pressure balance 124 is in the opening direction of the pressure in the connecting line 15 and acted upon by a biased spring, in the closing direction of the pressure between the diaphragm 12 and the pressure balance 124 is charged. In the first embodiment, the pressure in the connection line 15 , which is equal to the load pressure on the actuator, by means of a pressure sensor 122 measured, which to a control device 123 connected. The check valve allows only a volume flow from the pump 121 to the actuator towards. The fourth shift position 34 is a clearance position, in which the first and the second work connection 13 ; 14 with the tank 121 are connected so that the actuator can move freely.

The directional valve 10 according to the first embodiment has two first Raststellungen 50 and a second detent position 60 , The first two notches 50 are the second and the third switching position 32 ; 33 assigned, wherein the valve spool in each case at a predetermined opening cross section of the aperture 12 engages, for example, at the maximum opening cross-section. The second detent position 60 is the fourth shift position 34 assigned. The first notches 50 are using an electromagnetic actuator 70 unlocked, which to the control device 123 connected. The second detent position 60 is unlocked by a predetermined operating force is exceeded on the valve spool. The said actuating force can optionally be applied by hand, hydraulically, electro-hydraulically or electromagnetically.

2 shows a longitudinal section of the directional control valve 10 to 1 , The valve spool 30 is substantially rotationally symmetrical with respect to the longitudinal axis 11 formed, wherein it is in a fluid-tight bore in the housing 20 in the direction of the longitudinal axis 11 is movably recorded. On the valve spool 30 In particular Feinsteuerkerben are attached, which is the continuously adjustable aperture 12 define. The remaining fluidic connections, which with the valve spool 30 can be controlled according to the desired purpose of the directional control valve 10 are freely chosen, so that explanations are not displayed.

In the case 20 is a separate pole tube 73 screwed, which consists of a magnetically conductive material, such as steel. The pole tube 73 is substantially rotationally symmetric with respect to the longitudinal axis 11 formed, wherein it is open at both ends. The pole tube 73 has a circular ring around the longitudinal axis 11 circumferential flow interruption section 74 which may consist of a magnetically non-conductive material, such as copper. But it is also conceivable that the pole tube 73 in the area of the river interruption section 74 is formed so thin that the material of the pole tube 73 saturates at the magnetic field strengths occurring during operation.

Between the pole tube 73 and the housing 20 is a separate holding part 100 firmly clamped, which is primarily the simplified production of the directional control valve 10 serves. Next can for the case 20 a material of lower hardness can be selected. It is also conceivable, the holding part 100 integral with the housing 20 or with the pole tube 72 train. In the holding part 100 are in the present case a total of three first catch body 52 taken, which are formed as balls, wherein they are evenly distributed around the longitudinal axis 11 are arranged around. In the holding part 100 is for every first ratchet body 52 a circular holding breakthrough is provided, which is the holding part 100 perpendicular to the longitudinal axis 11 interspersed. The first catch body 52 are thus relative to the housing 20 in the direction of the longitudinal axis 11 held in a form-fitting manner, being transverse to the longitudinal axis 11 are mobile.

The valve spool 30 passes through the holding part 100 in the direction of the longitudinal axis 11 , where there are two first locking contours 53 directly on the valve spool 30 are provided, which are assigned to the two first locking positions. The valve spool 30 has in this area one with respect to the longitudinal axis 11 circular cylindrical outer peripheral surface, wherein the first locking contours 53 each as a circular ring about the longitudinal axis 11 circumferential grooves are formed. Their groove cross-sectional shape is for example trapezoidal, so that the first locking body 52 by movement of the valve spool 30 in the direction of the longitudinal axis 11 from the first stop contours 53 can be excavated, as far as this movement through the actuator body 80 not hindered.

The actuator body 80 is formed as a separate component, which in the present case rotationally symmetrical with respect to the longitudinal axis 11 is trained. He is in the pole tube 73 in the direction of the longitudinal axis 11 movably received, being both relative to the housing 20 as well as relative to the valve spool 30 is mobile. The valve spool 30 passes through the actuator body 80 in the direction of the longitudinal axis 11 , The actuator body 80 has at the first locking bodies 52 facing one end to the longitudinal axis 11 inclined wedge surface 81 , which in the present case is designed as an inner cone, its diameter to the first detent bodies 52 increases. The actuator body 80 is in the present case of an electromagnetic actuator 70 in the direction of the first catch body 52 pressed so that these through the wedge surface 81 again against the valve spool 30 be pressed. When the first catch body 52 in one of the first latching contours 53 are engaged, they can against the force of the actuator 70 by movement of the valve spool 30 only by overcoming a latching force from the relevant locking contour 63 be pushed out. When the corresponding operating force of the actuator 70 is lifted, can the valve spool 30 with little resistance, even if the first ratchet body 52 in a first locking contour 53 intervention. Then the first ratchet body 52 by movement of the valve spool 30 pressed radially outward, causing the actuator body 80 in 2 moved to the right.

In the embodiment according to 2 the electromagnetic force of the actuator acts 70 directly on the actuator body 80 , But it is also conceivable that the actuator body 80 from a prestressed spring in the direction of the first detent body 52 is pressed, wherein the electromagnetic force of the actuator 70 the spring force counteracts. The anchor 72 is preferably between said spring and the actuator body 80 clamped.

The electromagnetic actuator 70 includes a coil 71 which outside around the pole tube 73 is arranged, being firmly connected to this. The sink 71 may be formed as a separate component which releasably connected to the pole tube 73 connected is. It is also conceivable that the coil 71 inseparable from the pole tube 73 is shed. The sink 71 is from a bobbin case 75 , a pole disk 76 and the pole tube 73 surrounded by the coil 71 caused magnetic flux is concentrated in these parts. The said parts are made of magnetically conductive material for this purpose. The already mentioned flow interruption section 74 urges the magnetic flux out of the pole tube 73 in the anchor 72 , which also consists of magnetically conductive material. The anchor 72 is in the direction of the longitudinal axis 11 movable in the pole tube 73 He picked up the valve spool 30 surrounds annularly. The anchor 72 is preferably rotationally symmetrical with respect to the longitudinal axis 11 educated. It should be noted that in 2 the two end positions of the anchor 72 are shown. Above the longitudinal axis 11 is the position of the anchor 72 shown, which is present when the coil 71 is not energized. Below the longitudinal axis 11 is the energized position of the anchor 72 shown. In this position is the air gap 77 between anchors 72 and pole tube 73 smallest, allowing a current to the coil 71 a force on the anchor 72 causes which on the actuator body 80 is addressed to. The sink 71 is with a connection socket 78 electrically connected, which through the coil housing 75 protrudes outwards.

Between the anchor 72 and the valve spool 30 is a flow interruption body 90 arranged, which consists of a magnetically non-conductive material. This is to minimize the magnetic leakage flux, which extends over the valve spool 30 which consists of ferromagnetic steel. It is understood that a valve spool 30 made of magnetically non-conductive material would be optimal in this regard. However, in view of the stresses occurring in a hydraulic valve is a valve spool 30 made of steel nevertheless preferred.

The river breaker body 90 is formed in the form of a circular cylindrical tube which is provided on its outer peripheral surface with an annular circumferential projection on which the armature 72 in the direction of the longitudinal axis 11 is positively supported. Next is the river breaker body 90 frontally on the actuator body 80 so that the magnetic force of the armature 72 over the river breaker body 90 on the actuator body 80 is transmitted.

The valve spool 30 passes through the pole tube 73 over its entire length, where it protrudes from this. Outside the pole tube 73 becomes the valve spool 30 sections of a return spring 35 surrounded, which in the present case is designed as a helical spring. The return spring 35 is between two separate spring plates 36 strained in the direction of the longitudinal axis 11 in opposite directions respectively on the valve spool 30 and indirectly on the housing 20 are supported. In the first control position, which by the return spring 35 is adjusted, both supports are effective. In the other positions of the valve spool 30 is on every spring plate 36 only one of the two possible supports effective. The return spring 35 is of a separate spring housing 37 surrounded, which firmly with the pole tube 73 connected is. The position of the spring housing 37 in the direction of the longitudinal axis 11 is minimally adjustable to the return spring 35 set free of play. The first interior, in which the return spring 35 is received, is preferably vented to the environment. The second interior, in which the anchor 72 is received and sealed against the first interior, is preferably depressurized to the tank. It is understood that the actuating device can also be embodied in other designs: Instead of a plunger anchor, for example, a flat armature could be used.

In the present case, a total of three second catch body 62 provided in the valve slide 30 are taken, being transverse to the longitudinal axis 11 are movable, being in the direction of the longitudinal axis 11 positive fit in the valve slide 30 are held. The associated second catch contour 63 is inside the holding part 100 arranged. By this latching the valve slide 30 held in the fourth control position. This detent is not from the actuator 70 affected. Rather, is in the valve spool 30 a preloaded detent spring 65 recorded, whose spring force over several spherical coupling body 64 on the second catch body 62 is transmitted. The corresponding detent can be solved by the valve spool 30 with a sufficiently large force in the direction of the longitudinal axis 11 is charged.

3 shows a circuit diagram of a second embodiment of a directional control valve according to the invention 10 ' , The second embodiment is identical to the first embodiment except for the differences described below, so that in this regard to the comments on 1 and 2 is referenced. Here are in the 1 to 4 the same or corresponding parts provided with the same reference numerals.

In the second embodiment, some simplifications have been made primarily to save costs. For one thing, the second ratchet body and all were assigned Design elements omitted, with instead an additional first locking contour 53 ' was introduced, which the valve spool 30 in the fourth control position 34 locks. Next, the pressure sensor was omitted. This is used in the first embodiment, inter alia, to realize a kick-out function in which the detent is released when the measured with the pressure sensor load pressure exceeds a predetermined value. The detent is thereby solved, for example, when the actuator moves against a fixed stop or in its final position. As a result, the valve spool is moved by the return spring in the first control position, in which the actuator stops moving.

In the second embodiment are at the directional control valve 10 ' several switching contours 112 provided with which a switching means 111 is operable. The switching means 111 in the present case is in the electrically opened state, when the directional control valve 10 ' in the second or the third control position 32 ; 33 located. It is in the electrically closed state when the directional control valve 10 ' in the first or the fourth control position 31 ; 34 located. It is understood that the polarity of the switching means 111 can also be chosen vice versa. Instead of the switching means 111 can also be used a displacement sensor. The control device 123 can thus differentiate the locking behavior according to the present control position. It can be thought that the detent in the second and the third control position is released after a predetermined period of time. In the fourth control position, however, the detent should be permanently effective, the detent force should be set so low that the detent is releasable by applying force to the valve spool in the direction of the longitudinal axis.

It should also be noted that the latching is preferably always deactivated when the vehicle or the system in which the directional control valve is installed, is switched from a deactivated state to the active state. One speaks in this regard also of a neutral protection, which is to be found for example in agricultural tractors for safety reasons in some models.

4 shows a longitudinal section of the directional control valve 10 ' to 3 , The switching means 111 is in a separate switch housing 113 taken, which at the pole tube 73 is attached, taking it from the spring housing 37 is surrounded. The switching means 111 is presently designed as a mechanical switch, which with a switching tongue of the switching contour 112 follows. The switching contour 112 is directly on the valve spool 30 arranged in the form of two annular around the valve spool 30 circumferential grooves are formed, which are arranged so that the switching means 111 in the electrically closed state, when the switching tongues are within said grooves. If the switching tongues the circular cylindrical outer peripheral surface of the valve spool 30 Touch is the switching means 111 in the electrically open state. It is understood that the polarity of the switching means 111 can also be chosen vice versa. The switching means 111 is with a connection socket 114 electrically connected, which by the spring housing 37 protrudes outwards. It should be noted that the switching means 111 is in the same switching state in the first and in the fourth control position. In the first control position but no latching is still active because no corresponding first locking contour is provided.

LIST OF REFERENCE NUMBERS

10

Directional control valve (first embodiment)

10 '

Directional valve (second embodiment)

11

longitudinal axis

12

continuously adjustable aperture

13

first work connection

14

second work connection

15

connecting line

20

casing

30

valve slide

31

first control position

32

second control position

33

third control position

34

fourth control position

35

Return spring

36

spring plate

37

spring housing

50

first detent position

52

first catch body

53

first catch contour

53 '

additional first locking contour of the second embodiment

60

second detent position

62

second catch body

63

second locking contour

64

coupling body

65

detent spring

70

actuator

71

Kitchen sink

72

anchor

73

pole tube

74

River interrupting section

75

coil housing

76

pole disk

77

air gap

78

socket

80

operating body

81

wedge surface

82

Holding breakthrough

90

Stopping flow body

100

holding part

110

Position-detecting means

111

switching means

112

switching contour

113

switch housing

114

socket

120

pump

121

tank

122

pressure sensor

123

control device

124

pressure compensator

125

check valve

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

• DE 3923743 A1 [0002, 0005]
• DE 102012208943 A1 [0003]
• EP 751302 B1 [0004]

Claims (13)

Directional valve ( 10 ; 10 ' ) with a housing ( 20 ), in which a valve spool ( 30 ) in the direction of a longitudinal axis ( 11 ) is movably received, wherein at least a first detent body ( 52 ) is provided, which transverse to the longitudinal axis ( 11 ) is movable, relative to the housing ( 20 ) in the direction of the longitudinal axis ( 11 ) positively held ( 82 ), wherein at least one first latching contour ( 53 ) in the direction of the longitudinal axis ( 11 ) firmly with the valve slide ( 30 ), each first locking contour ( 53 ) with the at least one first latching body ( 52 ) is engageable such that the valve spool ( 30 ) each in an associated first detent position ( 50 ), wherein an electromagnetic actuator ( 70 ) is provided, which with the at least one first detent body ( 52 ), characterized in that one in the direction of the longitudinal axis ( 11 ) movable actuator body ( 80 ) is provided, which one to the longitudinal axis ( 11 ) inclined wedge surface ( 81 ), which with the at least one first latching body ( 52 ) is motion-coupled, wherein the actuating body ( 80 ) with the actuating device ( 70 ) is coupled such that an already carried out engagement between the at least one first latching body ( 52 ) and a first locking contour ( 53 ) using the actuator ( 70 ) can be canceled. Directional valve according to claim 1, wherein the actuating device ( 70 ) a pole tube ( 73 ), which is fixed to the housing ( 20 ), wherein a coil ( 71 ) around the pole tube ( 73 ) is arranged around and firmly connected thereto, wherein the at least one first latching body ( 52 ), which has at least one first catch contour ( 53 ) and the actuating body ( 80 ) within the pole tube ( 73 ) are arranged. Directional control valve according to claim 2, wherein inside the pole tube ( 73 ) in the direction of the longitudinal axis ( 11 ) movable anchor ( 72 ) is arranged, which with the actuating body ( 80 ) is coupled such that an already carried out engagement between the at least one first latching body ( 52 ) and a first locking contour ( 53 ) by means of the actuating device ( 70 ) can be canceled. Directional valve according to claim 3, wherein the armature ( 72 ) in the direction of the longitudinal axis ( 11 ) relative to the valve spool ( 30 ) and relative to the housing ( 20 ) is movable. Directional valve according to one of claims 2 to 4, wherein the valve spool ( 30 ) in the pole tube ( 30 ), wherein the at least one first latching contour ( 63 ) directly on the valve spool ( 30 ) is arranged. Directional valve according to claim 5, as far as this is dependent on claim 3, wherein the armature ( 72 ) ring-like around the valve spool ( 30 ) is arranged around. Directional valve according to claim 6, wherein between the valve spool ( 30 ) and the anchor ( 72 ) a flow interruption body ( 90 ) is arranged, which consists of a magnetically non-conductive material. Directional valve according to claim 7, wherein the flow interruption body ( 90 ) in the direction of the longitudinal axis ( 11 ) is movable, being with the anchor ( 72 ) is motion coupled. Directional control valve according to one of claims 2 to 8, wherein the at least one first latching body ( 52 ) in a separate holding part ( 100 ), which between the housing ( 20 ) and the pole tube ( 73 ) is held. Directional control valve according to one of the preceding claims, wherein at least one second detent body ( 62 ) is provided, which transverse to the longitudinal axis ( 11 ) is movable, relative to the housing ( 20 ) or relative to the valve spool ( 30 ) in the direction of the longitudinal axis ( 11 ) is held positively, wherein at least one second locking contour ( 63 ) in the direction of the longitudinal axis ( 11 ) firmly with the valve slide ( 30 ) or fixed to the housing ( 20 ), each second locking contour ( 63 ) with the at least one second latching body ( 62 ) is engageable such that the valve spool ( 30 ) each in an associated second detent position ( 60 ), with no coupling between the actuator ( 70 ) and the at least one second detent body ( 62 ) is available. Directional control valve according to claim 10, as far as this is dependent on claim 9, wherein the at least one second locking contour ( 63 ) directly on the holding part ( 100 ) is arranged. Directional valve according to one of the preceding claims, wherein at least one position detecting means ( 110 ) is provided, with which the relative position between the valve slide ( 30 ) and the housing ( 20 ) is measurable. Directional valve according to one of the preceding claims, wherein a pressure sensor ( 122 ) is provided, with a load pressure at the directional control valve ( 10 ; 10 ' ) is measurable, whereby a control device ( 123 ) is provided, to which the actuating device ( 70 ) and the pressure sensor ( 122 ) are connected, wherein the control device ( 123 ) is adapted to a previously made engagement between the at least one first detent body ( 52 ) and a first locking contour ( 53 ) using the Actuating device ( 70 ) cancel if said load pressure exceeds a predetermined value.

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