Electro-hydraulic pressure regulating valve

Abstract

The invention relates to an electro-hydraulic pressure regulating valve 1, having a valve housing 4 with a flange 5 for flange connection to an apparatus 6, an electromagnet 2 arranged in the valve housing 4 with a pole core 9, an armature 20 arranged in the valve housing 4 and movable by the electromagnet 2, wherein the armature 20 is in mobile connection with a valve spindle 8, and a sealing device 7 designed to seal the contact area between the valve housing 4 and the pole core 9, so that fluid is prevented from or made difficult to penetrate between the pole core 9 and the valve housing 4.

Description

TECHNICAL FIELD

[0001] The invention relates to an electro-hydraulic pressure regulating valve corresponding to the preamble of patent claim 1. Such pressure regulating valves are known per se and are used for example in construction machines, agricultural machines and forestry machines for pre-controlling directional valves. BACKGROUND

[0002] Common pressure regulating valves as described for example in document DE 44 23 103 A1 or DE 20 2010 017 049 have a valve sleeve which is pushed into a receiving bore of an end cap of a directional valve or into a control block. Thereby a mass production for different application cases can be achieved.

[0003] However, when such pressure regulating valves are used in large numbers in small flangeable control blocks which are screwed on the device, a saving can be achieved in that the pressure regulating valve is embodied flangeable and saves the control block.

[0004] Flangeable valves are known per se, for example commercially common directional valves of hydrostatic systems are mainly embodied flangeable. These directional valves are usually fastened by means of a mounting platform. Flangeable pressure regulating valves are also known, for example document DE 10 2012 010 986 A1 describes a plastic injection-moulded encapsulated pressure regulating valve of this construction form. This pressure regulating valve shall be improved in the invention in order to make it more robust and more precise. SUMMARY

[0005] Object:

[0006] Starting from a very robust and precise pressure regulating valve as shown in document DE 20 2010 017 04, the pressure regulating valve according to the invention shall be embodied flangeable, have a very low hysteresis and be more cost-effectively producible.

[0007] Solution:

[0008] This object is achieved by the features of the independent patent claim. The dependent claims show advantageous refinements of the invention.

[0009] The object is therefore achieved by an electro-hydraulic pressure regulating valve having a valve housing, an electromagnet having a pole core, an armature, and a sealing device. The valve housing has a flange which is designed for flange connection to an external device. Advantageously, the external device does not have to have a bore or recess for the pressure regulating valve, but rather a flat face is sufficient to which the pressure regulating valve can be flange-connected. The pressure regulating valve thus allows a space-saving connection to the device.

[0010] The pole core is arranged within the valve housing and at least partially directly against the inner wall of the valve housing. Furthermore, the pole core closes the opening of the flange side of the valve housing. Thereby, the pole core is preferably used for fluidically connecting the pressure regulating valve to the device. In the pole core there is at least designed a working interface, a pressure interface and a tank interface which are provided for fluidic connection to the device. Since the pole core is formed within the valve housing and exposed to the flange side of the valve housing, an easy connection to the device can be achieved, wherein the device only has to provide adapted counter interfaces. No special machining of the device is necessary, in particular no recesses have to be provided. The connection of the individual interfaces takes place in particular in axial direction, i.e. the fluid flow preferably flows in axial direction into the pressure regulating valve and out of the pressure regulating valve. The axial direction is in particular oriented coaxially to the center axis of the valve housing and / or the pole core and / or the armature and / or the electromagnet.

[0011] The pole core also has a plurality of bores which fluidically connect the tank interface, the pressure interface and the working interface. In at least one of the bores a valve core is guided which enables the pressure interface and the tank interface to be selectively connected and disconnected from the working interface. In this way different fluid flows can be achieved.

[0012] Likewise, the armature is arranged within the valve housing, wherein the armature can be moved by the electromagnet. In particular, the electromagnet is a proportional magnet. The electro-hydraulic pressure regulating valve is therefore preferably a proportional acting electro-hydraulic pressure regulating valve. The armature and the valve core are in mobile coupling, whereby different fluid flows through the valve can be adjusted by means of the electromagnet.

[0013] The sealing device is arranged on the pole core and is designed for mounting to the device. The sealing device serves to seal the connection of the pressure interface and / or the tank interface and / or the working interface to each other and / or to the environment of the device. It is particularly advantageous that at least one section of the sealing device, in particular each section of the sealing device, has a side which is exposed with respect to the pressure interface or the tank interface or the working interface, and an opposite side which is exposed with respect to the other one of the interfaces or the environment.

[0014] The sealing device is also designed to seal the contact area between the valve housing and the pole core. In this way, it is prevented or at least made difficult for fluid to penetrate between the pole core and the valve housing. In this way, in particular, it is not necessary to protect the components within the valve housing from corrosion with special measures. As a result, the structure of the pressure regulating valve is simple and the manufacture of the pressure regulating valve is cost-effective.

[0015] Preferably, the pole core has a bevel or a recess on the outer edge. The outer edge of the pole core is preferably the area against which the valve housing abuts. It is furthermore preferably proposed that the bevel or the recess is directed towards the apparatus. From the recess or the bevel, a groove is formed which is limited on the one hand by the pole core and on the other hand by the valve housing. The sealing device is at least partially arranged in this groove. As a result, the sealing effect described above is advantageously achieved. Furthermore, it is prevented or at least made difficult for the sealing device to slip when the pressure regulating valve is in operation. As a result, a lasting sealing effect is ensured.

[0016] The pole core is preferably designed as a single piece. As described above, since no special measures are required to protect against corrosion, it is also not necessary to install additional elements between the pole core and the valve housing. Rather, the pole core can preferably abut directly against the valve housing. As a result, on the one hand, the manufacture of the pole core is simplified, since the pole core is only a single part; at the same time, the assembly of the pressure regulating valve is also simplified, since only the pole core has to be assembled, without additional elements having to be assembled.

[0017] It is furthermore preferably proposed that the sealing device is designed as a single piece. The sealing device is in particular a face seal made of a single part. The assembly of the pressure regulating valve is thus further simplified.

[0018] In an advantageous design, the pole core has a groove-like sealing element guide region which extends annularly around the working interface. Here, the sealing element guide region is particularly advantageously an Eindrehung. To this end, the pole core is preferably manufactured as a turned part, wherein the working interface is in particular arranged on the rotational axis. The sealing device is at least partially arranged in the sealing element guide region. As a result, it is prevented or at least made difficult for the sealing device to slip or to be displaced. As a result, the sealing device is in particular held in the position provided when different fluid pressures act on different sides of the sealing device. Since the working interface can be connected to the tank interface and the pressure interface or not connected to any of these interfaces, a constantly changing pressure is exerted at the working interface. Despite the pressure change, displacement of the sealing device is prevented or at least made difficult by the sealing element guide region.

[0019] Preferably, the bores have a first bore, a second bore and a third bore. The first bore is designed to accommodate the valve core and is in fluid connection with the working interface. Particularly preferably, the first bore extends along the central axis of the pole core. The second bore is in fluid connection with the tank interface and the third bore is in fluid connection with the pressure interface. Different connections of the bores and thus different flow rates between the individual interfaces can thus be established by movement of the valve core.

[0020] Particularly advantageously, a first bore hole and a second bore hole separate from the first bore hole are formed at the first bore. The diameter of the first bore thus increases at the first bore hole and the second bore hole. The second bore extends into the first bore hole and the third bore extends into the second bore hole. The second bore and the third bore are thus preferably oriented obliquely to the first bore. In this way, the first bore, the second bore and the third bore are connected to one another in a simple and reliable manner.

[0021] It is furthermore particularly advantageous to propose that the second bore has a length of between 9.0 mm and 15.0 mm, in particular 11.5 mm, and / or an angle of between 10° and 30°, in particular 20°, relative to the first bore. It is particularly advantageous for the third bore to have a length of between 5.0 mm and 11.0 mm, in particular 7.5 mm, and / or an angle of between 20° and 40°, in particular 30°, relative to the first bore. With this design it is possible to achieve an optimum flow of fluid through the pressure regulating valve, in which the pressure drop within the pressure regulating valve is optimised.

[0022] In an alternative advantageous design, the bores have a fourth bore for connecting the first bore with the second bore and a fifth bore for connecting the first bore with the third bore. The second bore and the third bore are thus preferably oriented parallel to the first bore. As described previously, it is not necessary to form bore holes.

[0023] The fourth bore and the fifth bore are advantageously oriented transversely, in particular perpendicularly, to the first bore. The fourth bore and the fifth bore are closed on the outer surface of the pole core. Fluid is thus prevented from escaping undesirably from the fourth bore and the fifth bore. The closure of the fourth bore and the fifth bore is advantageously each carried out by means of a laser weld. In particular, each of the bores is provided with its own laser weld, which is particularly advantageously arranged around the pole core. Furthermore, the respective laser weld is used in particular to connect the pole core with a pressure sleeve which surrounds the pole core in the circumferential direction. This connection simultaneously serves as a seal between the pole core and the pressure sleeve, so that no additional sealing elements, such as O-rings, are required.

[0024] The valve core has, in particular, a first cross section for fluidically connecting the working connection to the tank connection or to the pressure connection. Furthermore, the valve core has, in particular, a second cross section for fluidically separating the working connection from the tank connection or from the pressure connection. The first cross section preferably has a bore and, in particular, constitutes a connection cross section through which a fluid can flow, between 2.5 mm 2 and 5.0 mm 2 , preferably 3.2 mm 2 . Through this connection cross section, fluid can flow between the working connection and the tank connection and can flow between the pressure connection and the working connection. By virtue of the design of the connection cross section as described above, a flow rate of 2 liters per minute at a pressure difference of 2.7 bar can be achieved, in particular. The first cross section is thus fluidically optimized with respect to the fluid flow through the pressure regulating valve. Preferably, the pole core has a length of at most 60% of the total length of the pole core and the armature. The length of the armature is thus optimized, since the armature can receive, by virtue of the corresponding design of its length, an optimized amount of leakage flux from the magnetic field of the electromagnet. A maximum magnetic force can thus be generated. The total length of the armature and the pole core is here, in particular, limited by the valve housing.

[0025] It is preferably also proposed that the armature and / or the valve core can be moved in an axial direction. The axial direction is oriented, in particular, coaxially to the central axis of the pressure regulating valve. Preferably, the pole core does not protrude beyond the flange with respect to the axial direction. The pole core thus does not protrude into the device when the pressure regulating valve is connected to the device. This can achieve a simple design of the device, so that no high- expenditure machining or shaping of the device is necessary for the connection of the pressure regulating valve.

[0026] The pressure regulating valve is particularly suitable for regulating a pre-control pressure for the connection of a downstream directional valve or for an auxiliary purpose of a machine to be controlled in accordance with an electrical control signal.

[0027] The control signal is preferably present as a regulated electrical current and is converted into a force in the electromagnet, which is part of the pressure regulating valve, which force is advantageously proportional to the electrical current even at different displacements of the armature due to the particular, but known, embodiment of the electromagnet, in particular due to the shaping of the poles of this electromagnet.

[0028] The force is transmitted from the armature to the valve core, in particular by means of a push rod. On this valve core, the force of the armature fluid is compared with the hydraulic pressure, which results from the pressure on the end face of the valve core, which is connected to the working connection, and the size of this end face.

[0029] If the pressure acting on the working connection of the valve exceeds the force of the armature, the valve core is displaced in the direction of the electromagnet and releases a variable cross section for the liquid flow from the working connection to the tank connection. As a result, the pressure at the working connection decreases. If, however, the force of the armature exceeds the pressure acting on the working connection, the valve core is displaced away from the electromagnet and releases a second variable cross section for the liquid flow from the pressure connection to the working connection. As a result, the pressure at the working connection increases. If the force of the armature and the pressure are in equilibrium, a central position of the valve core is produced by means of the spring, which does not form a liquid flow towards or away from the working connection.

[0030] The described regulating function is carried out when a sufficient supply pressure and an appropriate throughput of pressure liquid is provided at the pressure connection. It is furthermore advantageous if there is a rather small pressure at the tank connection and the consumer connected to the working connection only reduces a small volume flow.

[0031] The variable cross sections for the liquid flow are preferably released by the interaction of the inner control edge of the valve core with the outer control edge in the pole surrounding the valve core. Preferably, always one of the two variable cross sections is released, however it is also possible to realize a construction form in which both variable cross sections act simultaneously, which is adjusted by a so-called overlap of the control edges.

[0032] The outer control edge is preferably a component of a bore or a lateral hole in the pole and these cavities are connected via longitudinal holes with the pressure connection and the tank connection. When using a bore, the longitudinal holes are advantageously arranged at a smaller angle with respect to the hole for the valve core in order to have a sufficiently large mutual spacing of the connection faces on the flange.

[0033] In the flange connection face of the device on which the pressure regulating valve is arranged, the working connection, the pressure connection and the tank connection are sealed with respect to one another and with respect to the environment. This is advantageously carried out by a common face seal with through-penetrations for the connections or by at least three O-rings which are clamped in a known manner, since these are placed in adapted circular recesses.

[0034] The pressure regulating valve according to the invention is very durable since it also has a magnet housing comprising the valve part, preferably made of deep-drawn iron; and it works very precisely when regulating the pressure since it has two variable cross sections to adjust the liquid flow.

[0035] The hysteresis of the pressure regulating valve is very small, in particular because the armature is guided very precisely by the valve spindle with respect to the pole, because the valve spindle and the push rod supporting the armature are advantageously embodied as a single piece, and the valve spindle slides in the pole with very little play. Alternatively, a joint head is provided. Here, this common component is advantageously made of a material that can be magnetized only to a small extent (for example made of brass or austenitic steel), so that no magnetic short circuit for bridging the air gap occurs.

[0036] Furthermore, the pressure regulating valve is flangeable, because the valve part of the pressure regulating valve is completely surrounded by the magnet housing of the proportional magnet, and thus the flange of the magnet housing limits the length of the entire device. No mounting hole in the device to which the pressure regulating valve is flangeable is required.

[0037] The costs of the facility consisting of the pressure regulating valve and the device of the upper stage are significantly reduced, because either the mounting hole in the device can be dispensed with, or an additional, flangeable control block with a mounting hole can be dispensed with.

[0038] Use:

[0039] The pressure regulating valve of the type described is used to precontrol a proportional-action shuttle valve in an electrohydraulic manner, and to control auxiliary functions in motor vehicle hydraulic systems (for example agricultural machines, construction machines and forestry machines). Use for adjusting a hydrostatic pump is also known. BRIEF DESCRIPTION OF DRAWINGS

[0040] Further details, advantages and features of the invention will emerge from the following description of embodiments with the aid of the drawings. In the drawings:

[0041] Figure 1 A pressure regulating valve of the invention is shown with a bore for guiding the valve spindle according to a first embodiment, and

[0042] Figure 2 A pressure regulating valve of the invention is shown with a lateral bore according to a second embodiment. DETAILED DESCRIPTION

[0043] A proportional-action electrohydraulic pressure regulating valve 1 is shown in Figure 1 and has a valve housing, an electromagnet 2 which converts an electric current into a proportional force, and a valve part 3 which converts the mentioned force into a regulated hydraulic pressure.

[0044] The electromagnet 2 consists of a coil, a yoke and a pole core 9, wherein the electromagnet 2 is arranged within the valve housing 4, which serves as an iron return. By means of the electromagnet 2, an armature 20 is movable.

[0045] The valve part 3 is also completely surrounded by the valve housing 4.

[0046] The flange 5 molded on the magnet housing 4 connects the pressure regulating valve 1 with the device 6 of the level above.

[0047] The valve part 3 contains a valve core 8 which can be moved in a first bore 15 of a pole core 9, which is loaded by a pressure acting on an end face of the valve core 8 facing away from the electromagnet 2 on the one hand and by the force of the electromagnet 2 on the other hand, and which is connected between a working interface A formed on the pole core 9 by means of a first cross section 11 and a tank interface T formed on the pole core and / or between a pressure interface P formed on the pole core 9 and the working interface A. By means of a second cross section 12, the valve core separates the working interface from the pressure interface and / or the tank interface.

[0048] In Figure 1 is shown the state of connection between the tank interface T and the working interface A, wherein the connection between the pressure interface and the working interface is open.

[0049] The pole core 9 surrounds the movable valve core 8 and has all the non-movable components of the valve part 3, i.e. the first bore 15 connected with the working interface A, the externally located control edge for the joint action of the first cross section 11 and the second cross section 12, and the second bore 18 for connecting the tank interface T with the first bore 15 and the third bore 19 for connecting the pressure interface P with the first bore 15.

[0050] The armature 20 is connected with the valve core 8 by means of a push rod or by means of a joint head 26, wherein the push rod and the valve core 8 are preferably embodied as a single piece, and the armature 20 is guided in particular through the valve core 8.

[0051] The components fulfilling the functions of the push rod and the valve core 8 are preferably made of brass or austenitic steel.

[0052] In the first embodiment, the cross sections 11 and 12 of the valve core 8 jointly act with the first bore 13 and the second bore 14 of the first bore 15 in order to release a liquid flow from the working interface A to the tank interface T or from the pressure interface P to the working interface A.

[0053] The first bore 13 is connected with the tank interface T via the second bore 18, and the second bore (14) is connected with the pressure interface P via the third bore 19.

[0054] The armature 20 and the valve core 8 can be moved in an axial direction 100, which is oriented coaxially to the center axis of the pressure control valve 1. In the first embodiment, the first bore 15 extends in the axial direction 100, while the second bore 18 and the third bore 19 are angled relative to the first bore 15. The second bore has a length of between 9.0 mm and 15.0 mm, in particular 11.5 mm. The third bore has a length of between 5.0 mm and 11.0 mm, in particular 7.5 mm. Furthermore, the second bore 18 has an angle of between 10° and 30°, in particular 20°, relative to the first bore 15. The third bore has an angle of between 20° and 40°, in particular 30°, relative to the first bore 15. The first cross section 11 has a bore transverse to the axial direction 100 and constitutes a fluid flowable connection cross section of between 2.5 mm 2 and 5.0 mm 2 , preferably 3.2 mm 2 . Through this connection cross section, fluid can flow between the working interface A and the tank interface T and can flow between the pressure interface P and the working interface A. With the design of the connection cross section as described above, a flow rate of 2 liters per minute at a pressure difference of 2.7 bar can be achieved. With this design, the fluid is optimally caused to flow through the pressure regulating valve, wherein the pressure drop within the pressure regulating valve is optimized.

[0055] The pole core 9 has a first length LI and the armature 20 has a second length L2. The first length LI is a maximum of 60% of the total length LI + L2 of the pole core 9 and the armature 20. With this second length L2, the armature 20 can receive a large amount of leakage flux from the magnetic field of the electromagnet 2. Thereby, the largest magnetic force can be generated.

[0056] Furthermore, there is a sealing device 7. The sealing device 7 is a one-piece seal, in particular a face-type seal, and fulfills multiple functions. On the one hand, the sealing device 7 is designed to abut against the device 6 in order to seal the fluid connections of the tank interface T, the working interface A and the pressure interface P relative to one another and to the environment of the device 6. Furthermore, the sealing device 7 is used to seal the contact area between the pole core 9 and the valve housing 4. To this end, the pole core 9 has a bevel 22 or a recess, which constitutes a groove 10. The groove 10 is limited on the one hand by the pole core 9 and on the other hand by the valve housing 4. The sealing device 7 is arranged at least partially in the groove 10 and thus seals the contact area between the pole core 9 and the valve housing 4. Thereby, it is prevented that fluid penetrates between the valve housing 4 and the pole core 9 or that special corrosion protection measures are required within the valve housing 4. Furthermore, in this way it is possible to form the pole core 9 in one piece and to abut it directly against the valve housing 4.

[0057] Furthermore, a recess-like seal guide region 27 is provided around the working interface A, which is used to at least partially accommodate the sealing device 7. Thereby, the sealing device 7 is difficult to displace. This is particularly advantageous, since a permanently changing pressure is exerted at the working interface A.

[0058] Furthermore, the pole core 9 is sealed against the surrounding pressure sleeve 28 by means of an additional seal 23. The arrangement of the spring 25 between the pole core 9 and the armature 20 ensures that the armature 20 is moved into the initial position in the event of removal of the magnetic field of the electromagnet 2, in which the valve core 8 connects the working interface A to the tank interface T.

[0059] In the second embodiment shown in Figure 2 , the pressure regulating valve 1 differs from the first embodiment only in the design of the pole core 9. In the second embodiment, in addition to the first bore 15, the second bore 18 and the third bore 19, a fourth bore 16 and a fifth bore 17 are present. The first bore 15, the second bore 18 and the third bore 19 are preferably oriented parallel to one another and advantageously parallel to the axial direction 100. The fourth bore 16 serves to connect the first bore 15 to the second bore 18 and the fifth bore 17 serves to connect the first bore 15 to the third bore 19. It is not necessarily necessary to form the first bore 13 and the second bore 14 described earlier. Preferably, the fourth bore 16 and the fifth bore 17 are oriented perpendicular to the first bore 15.

[0060] In order to prevent, fluid from undesirably flowing out of the pole core 9, the fourth bore 16 and the fifth bore 17 are sealed at the outer surface of the pole core 9. Preferably, this sealing is carried out by means of a respective laser weld 24. Preferably, each laser weld 24 is implemented circumferentially around the pole core 9 and welds the pole core 9 to the pressure sleeve 28. Thus, instead of Figure 2 the illustration in , the additional seal 23 can be dispensed with, since the sealing effect is already achieved by means of the respective laser weld 24.

[0061] In all cases, the pole core 9 does not protrude in the axial direction 100 beyond the flange 5. Thereby, the pressure regulating valve 1 can be placed directly against the device 6 without having to provide a special recess for the pressure regulating valve arrangement at the device 6.

[0062] Figure 1 In addition to the above written description of the application, the disclosure is hereby explicitly supplemented by reference to the illustration of the application in Figure 2 and .

[0063] List of reference signs

[0064] 1 pressure regulating valve

[0065] 2 electromagnet

[0066] 3 valve part

[0067] 4 valve housing

[0068] 5 flange

[0069] 6 device

[0070] 7 sealing means

[0071] 8 valve core

[0072] 9 pole core

[0073] 10 recess

[0074] 11 variable first cross section

[0075] 12 variable second cross section

[0076] 13 first bore

[0077] 14 second bore

[0078] 15 first hole

[0079] 16 fourth hole

[0080] 17 fifth hole

[0081] 18 second hole

[0082] 19 third hole

[0083] 20 keeper

[0084] 21 opening of the valve housing

[0085] 22 bevel

[0086] 23 additional sealing means

[0087] 24 laser weld seam

[0088] 25 spring

[0089] 26 joint head

[0090] 27 sealing means guide region

[0091] 28 pressure sleeve

[0092] A working interface

[0093] P pressure interface

[0094] T tank interface

Claims

1. An electro-hydraulic pressure regulating valve (1) having: • a valve housing (4) having a flange (5) designed for flange connection to a device (6); • an electromagnet (2) arranged within the valve housing (4) having a pole core (9), o wherein the pole core (9) is arranged within the valve housing (4) and at least partially directly against an inner wall of the valve housing (4), o wherein the pole core (9) closes an opening (21) on the flange side of the valve housing (4), o wherein at least a working connection (A) provided for fluid connection to the device (6), a pressure connection (P) and a tank connection (T) are designed in the pole core (9), o wherein the pole core (9) has a plurality of holes (15, 16, 17, 18, 19) which fluidically connect the tank connection (T), the pressure connection (P) and the working connection (A), and o wherein at least in one of the holes (15, 16, 17, 18, 19) a valve core (8) is guided, by means of which the pressure connection (P) and the tank connection (T) can be selectively connected and disconnected from the working connection (A); • a armature (20) arranged within the valve housing (4) and movable by the electromagnet (2), wherein the armature (20) is in mobile coupling with the valve core (8); the armature (20) and / or valve core (8) are movable in an axial direction (100), wherein the pole core (9) does not protrude beyond the flange (5) with respect to the axial direction (100); and • a sealing device (7), o which is arranged on the pole core (9) and designed to lie against the device (6), and o which is designed to seal the connections of the pressure connection (P) and / or the tank connection (T) and / or the working connection (A) to the device (6) relative to one another and / or to the environment, characterized in that • the sealing device (7) is designed to seal the contact area between the valve housing (4) and the pole core (9) such that fluid penetration between the pole core (9) and the valve housing (4) is prevented or at least made difficult; the pole core (9) has a bevel (22) or a recess on the outer edge, from which a groove (10) is formed which is limited by the pole core (9) and the valve housing (4), wherein the sealing device (7) is at least partially arranged in the groove (10). The pole core (9) is designed as a single piece. The sealing device (7) is designed as a single piece. The pole core (9) has a groove-like sealing guide region (27) which extends annularly around the working connection (A), wherein the sealing device (7) is at least partially arranged in the sealing guide region (27). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. Pressure regulating valve (1) according to claim 1, characterized in that ​ 3. Pressure regulating valve (1) according to claim 1 or 2, characterized in that ​ 4. Pressure regulating valve (1) according to claim 1 or 2, characterized in that ​ 5. Pressure regulating valve (1) according to claim 1 or 2, characterized in that The bores (15, 16, 17, 18, 19) have a first bore (15), a second bore (18) and a third bore (19), wherein the first bore (15) is designed to accommodate the valve core (8) and is in fluid connection with the working connection (A), wherein the second bore (18) is in fluid connection with the tank connection (T) and wherein the third bore (19) is in fluid connection with the pressure connection (P).

6. Pressure regulating valve (1) according to claim 5, characterized in that A first bore (13) and a second bore (14) separate from the first bore (13) are formed at the first bore (15), wherein the second bore (18) extends into the first bore (13), wherein the third bore (19) extends into the second bore (14) and wherein the second bore (18) and the third bore (19) are oriented obliquely to the first bore (15).

7. Pressure regulating valve (1) according to claim 6, characterized in that The second bore (18) has a length of between 9.0 mm and 15.0 mm and / or an angle of between 10° and 30° relative to the first bore (15) and / or the third bore (19) has a length of between 5.0 mm and 11.0 mm and / or an angle of between 20° and 40° relative to the first bore (15).

8. Pressure regulating valve (1) according to claim 7, characterized in that The second bore (18) has a length of 11.5 mm and an angle of 20° relative to the first bore (15) and the third bore (19) has a length of 7.5 mm and an angle of 30° relative to the first bore (15).

9. The pressure regulating valve (1) according to claim 5, characterized in that The bores (15, 16, 17, 18, 19) have a fourth bore (16) for connecting the first bore (15) with the second bore (18) and a fifth bore (17) for connecting the first bore (15) with the third bore (19), wherein the second bore (18) and the third bore (19) are oriented parallel to the first bore (15).

10. Pressure regulating valve (1) according to claim 9, characterized in that The fourth bore (16) and the fifth bore (17) are oriented transversely to the first bore (15), wherein the fourth bore (16) and the fifth bore (17) are closed on the outside of the pole core (9) by a laser weld (24) and wherein the welding of the fourth bore (16) and the fifth bore (17) is carried out by at least one laser weld (24) which is formed for a material-fit connection of the pole core (9) with a pressure sleeve (28) which at least partially surrounds the pole core (9).

11. Pressure regulating valve (1) according to claim 1 or 2, characterized in that The valve core (8) has a first cross section (11) for fluidically connecting the working connection (A) to the tank connection (T) or to the pressure connection (P) and a second cross section (12) for fluidically separating the working connection (A) from the tank connection (T) or from the pressure connection (P), wherein the first cross section (11) constitutes a fluidically passable connection cross section between 2.5 mm 2 and 5.0 mm 2 .

12. Pressure regulating valve (1) according to claim 11, characterized in that The first cross section (11) constitutes a connection cross section of 3.2 mm 2 through which fluid can flow.

13. Pressure regulating valve (1) according to claim 1 or 2, characterized in that The pole core (9) has a length of at most 60% of the total length of the pole core (9) and the armature (20).

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