Fail-safe pressure control valve for controlling or regulating the pressure of a fluid in a pilot pressure chamber and vibration damper with such a pressure control valve

Abstract

Pressure regulating valve (1), in particular fail-safe pressure regulating valve (1), for controlling or regulating the pressure of a fluid in a pilot pressure chamber, comprising - a valve housing (10) with at least one inlet (I) which is fluidically connectable to the pilot pressure chamber and with at least one outlet (O), wherein a pilot valve chamber (20) is arranged between the at least one inlet (I) and the at least one outlet (O), which is fluidically connected to the outlet (O) via a first passage channel (17) and to the inlet (I) via a second passage channel (18), - a plunger (60) and a pilot seal (65), - wherein the plunger (60) is movable along a longitudinal axis (L) by means of an energizable actuating device (70) and the pilot seal (65) can be moved along the longitudinal axis (L) between a first position in which the pilot seal (65) abuts the first valve seat (21) and closes the first passage channel (17), and a second position in which the pilot seal (65) abuts the second valve seat (22) and closes the second passage channel (18), characterized in that the valve housing (10) comprises a spring element (30) which has the first valve seat (21) and which is biased against a third valve seat (23) and closes a fail-safe channel (19) between the at least one outlet (O) and the pilot valve chamber (20).

Description

[0001] The present invention relates to a fail-safe pressure control valve for controlling or regulating the pressure of a fluid in a pilot pressure chamber, comprising the features of claim 1. Furthermore, the present invention relates to a vibration damper comprising such a pressure control valve, comprising the features of claim 19.

[0002] Pressure control valves are known in various designs from the prior art. For example, pressure control valves of this type are used in vibration dampers in motor vehicles, where the damping characteristic of the pressure control valve depends on the volume flow rate of the fluid flowing through the proportional valve. Depending on the volume flow rate, a more comfort-oriented, softer damping or a more sporty, firmer damping can be set. In vibration dampers, an electrically actuated device is used with which several damping characteristics can be set by the driver or automatically by an on-board computer depending on the driving condition of the motor vehicle or the condition of the road surface over which the motor vehicle is currently traveling.

[0003] The fluid can be hydraulic or pneumatic, with hydraulic fluid or compressed air being the most common. Pilot pressure chambers in hydraulically or pneumatically operated devices serve to control or regulate pilot-operated valves, often designed as hydraulic or pneumatic spools. When pilot-operated valves are designed as proportional valves or proportional spools, the flow rates through the proportional valve or spool can be continuously adjusted within certain limits by varying the pressure in the pilot pressure chamber.

[0004] Further state of the art is represented by the publications DE 10 2019 105 708 A1, DE 11 2020 006 905 T5 and DE 11 2021 001 030 T5.

[0005] Pressure control valves of this type have proven reliable in the past; however, it is essential to ensure that a failsafe mechanism is in place in the event of a power failure and, consequently, a failure of the pressure control valve's actuator. This ensures that the vehicle can continue operating with a specific damping characteristic even during a power outage, which is why such pressure control valves are described as fail-safe. A medium damping characteristic, neither too stiff nor too soft, is typically desired.

[0006] These requirements result in a relatively complex design for the device, particularly the vibration damper, as can be seen, for example, in US 2016 / 0 091 044 A1 and WO 2016 / 066 314 A1. The design is primarily complex because multiple slides must be used. Further vibration dampers are disclosed in US 2016 / 0 369 862 A1, JP 2009-115 319 A, US 5 147 018 A, WO 2011 / 023 351 A1, and US 2005 / 0 016 086 A1. In particular, the vibration damper disclosed in EP 2 678 581 B1 offers a medium damping characteristic even in failsafe mode.

[0007] A disadvantage of pressure control valves known from the prior art is that the failsafe function is implemented through a relatively complex and costly design, and that the damping behavior varies considerably due to component tolerances. Furthermore, there are only limited possibilities for adapting the characteristics of the failsafe curve to specific applications.

[0008] This is where the present invention comes in.

[0009] The present invention addresses the problem of proposing a fail-safe pressure regulating valve of the type that effectively eliminates the disadvantages known from the prior art. The proposed pressure regulating valve should be simple in design and capable of regulating the pressure in the pilot pressure chamber to a specific value even when no electrical energy is available to power the actuating device.

[0010] This problem is solved by a pressure regulating valve with the features of claim 1 and a vibration damper with the features of claim 19.

[0011] Further advantageous embodiments of the present invention are specified in the dependent claims.

[0012] The fail-safe pressure control valve according to the invention, comprising the features of claim 1 for controlling or regulating the pressure of a fluid in a pilot pressure chamber, includes a valve housing with at least one inlet that can be fluidically connected to the pilot pressure chamber.

[0013] Furthermore, the valve body has a first valve seat and a second valve seat located between the at least one inlet and the at least one outlet, both situated in a pilot valve chamber. The pilot pressure chamber is connected to the at least one outlet via a first through-channel and to the at least one inlet via a second through-channel.

[0014] Furthermore, the pressure regulating valve according to the invention comprises a plunger and a pilot seal, wherein the plunger is movable along a longitudinal axis between a first and a second position by means of an energized actuating device. The pilot seal is preferably arranged on the plunger, and the energized actuating device can move the plunger along the longitudinal axis from the first position to the second position against the force of a return spring.

[0015] In the unactuated state of the actuating device, the pilot seal is preferably positioned in the first position by means of a return spring. In the first position, the pilot seal rests against the first valve seat, sealing the first passage.

[0016] When the actuating device is in the actuated state, the plunger is in the second position, in which the pilot seal rests against the second valve seat and closes the second passage channel.

[0017] Furthermore, it is provided that the valve housing includes a spring element which has the first valve seat and that the spring element can be pre-tensioned against a third valve seat in order to close a fail-safe channel between the at least one outlet and the pilot valve chamber.

[0018] The present invention is based on the idea of ​​integrating a fail-safe function into the valve housing by forming a spring element in a first housing wall that delimits the pilot valve chamber. The first valve seat is arranged or formed on the spring element, whereby, in the de-energized or unactuated state of the actuating device, the pilot valve seal bears in sealing contact with the first valve seat, or preferably with the spring element. If pressure is present in the pilot valve chamber when the actuating device is de-energized, this pressure acts against the spring element and deforms it, preferably elastically, thereby lifting the spring element from the third valve seat and opening the fail-safe channel through which the fluid from the pilot valve chamber can flow to the at least one outlet.The spring element ensures that even in the event of a power failure, the vehicle can continue to operate safely and comfortably with a specific damping characteristic. By appropriately designing the spring element, i.e., its stiffness, a desired damping characteristic for fail-safe operation can be set, one that is neither too stiff nor too soft for the specific vehicle.

[0019] A further development of the present invention provides that the spring element comprises a first sealing section and a second sealing section, and that the first sealing section interacts with the first valve seat and the second sealing section interacts with the third valve seat. Preferably, the spring element is at least partially disc-shaped or ring-shaped, and the first sealing section and the second sealing section lie on a common ring-shaped section of the preferably disc- or ring-shaped spring element. This prevents fluid from flowing between the two sealing sections.

[0020] Both the first sealing section and the second sealing section are preferably designed in an annular shape.

[0021] A further development of the present invention provides that the first sealing section is arranged within the second sealing section.

[0022] A preferred embodiment of the present invention provides that the first sealing section and the second sealing section are arranged on the side of the spring element facing the pilot valve chamber. Accordingly, in the unactuated state of the actuating device, the pilot seal is in contact with the side facing the pilot valve chamber by means of the return spring, and any pressure present in the pilot valve chamber acts on the entire surface of the spring element.

[0023] Furthermore, it has proven advantageous if the spring element closes off the pilot valve chamber on one side along its longitudinal axis – preferably at its end. As already described above, the spring element has the first valve seat and also the first through-channel, which is preferably designed as a perforation in the spring element. The perforation is preferably arranged coaxially with the longitudinal axis and forms at least part of the first through-channel through which the fluid can flow from the pilot valve chamber to the at least one outlet. It is also preferred that the first valve seat is formed around the perforation.

[0024] A further development of the present invention provides that the spring element is concave or flat. Preferably, the spring element is elastically deformed into the concave shape in the state installed in the pressure regulating valve and further preferably spans a collar of the third valve seat.

[0025] According to a preferred embodiment of the present invention, the spring element comprises at least one flow section, through which the fluid can flow from the third valve seat to the at least one outlet. For example, the spring element can be star-shaped or gear-shaped, with the teeth or the teeth forming flow sections through which the fluid can flow.

[0026] According to a further development of the present invention, the valve housing is inserted into an actuator housing. The spring element is held – preferably clamped – between the actuator housing and the valve housing in such a way that the spring element presses against the third valve seat with a preload in order to seal against it.

[0027] The actuator housing may have a corresponding recess to form a receiving area into which the valve housing can be inserted. A channel may also be provided between the valve housing and the actuator housing, enabling fluid communication between the at least one outlet and the first through-channel and / or the fail-safe channel.

[0028] A further development of the present invention provides that the spring element is held in position by at least one spacer ring, wherein the spacer ring preferably specifies the position of the spring element in a plane transverse to the longitudinal axis.

[0029] Furthermore, it has proven advantageous if the at least one spacer ring has an outflow channel through which the first through-channel and / or the fail-safe channel are guided. The spacer ring can, for example, have a break formed between two end sections of the spacer ring. The spacer ring is thus not a completely closed ring and encloses an angle of << 360°, preferably approximately 300°.

[0030] A further development of the present invention provides that the valve housing comprises a second wall section which closes off the pilot valve chamber on the side opposite the spring element. The second wall section preferably comprises an insertion bushing which further preferably comprises the second valve seat.

[0031] The insertion bushing can be inserted, in particular in the manner of a press-fit bushing, into a corresponding opening along the longitudinal axis in a main valve housing part, thereby allowing the position of the second valve seat in the longitudinal axis to be adjusted precisely.

[0032] A preferred embodiment of the present invention provides for a bypass channel. The bypass channel can, for example, be formed on the second valve seat. The respective bypass channel can preferably be designed in the form of a groove or recess and allows fluid to flow, particularly when the pilot seal is in sealing contact with the second valve seat in the second position.

[0033] According to a further development of the present invention, the valve housing comprises a main valve chamber. The main valve chamber is fluidically connected to the at least one inlet and the at least one outlet. Preferably, a main valve spool, pre-tensioned against a main valve seat by means of a main spring, can be arranged in the main valve chamber. Preferably, the pilot valve chamber is fluidically connected to the main valve chamber via the second through-channel, whereby the fluid can flow from the inlet through the main valve chamber, including via the second through-channel and the pilot valve chamber, to the at least one outlet.

[0034] A further development of the present invention provides that the main slide valve is designed as a proportional slide valve.

[0035] Furthermore, it has proven advantageous if the actuating device is pressure-balanced. In particular, it is preferred if the actuating device includes a pressure equalization chamber that can communicate with the pilot valve chamber. For this purpose, it is advantageous if the plunger has a compensating bore through which fluid can flow along its longitudinal axis.

[0036] A further development of the invention also provides that a failsafe characteristic curve of the pressure control valve can be set by the thickness of a spacer ring and / or the spring element or the spring disc.

[0037] The spacer ring preferably defines the position of the spring element, particularly in a plane perpendicular to the longitudinal axis. The spacer ring preferably surrounds the spring element radially and can furthermore define a distance between the main housing part and the actuator housing. This distance can preferably be used to preload the spring element, whereby the preload can cause the spring element to be shaped into a concave form.

[0038] By varying the thickness or stiffness of the spring element, the spring rate of the spring element or spring washer can be adjusted. Therefore, the thickness or stiffness of the spring element and / or the spacer ring can be selected to adjust the characteristics of the hydraulic failsafe curve, depending on the application.

[0039] Another aspect of the present invention relates to a vibration damper with a previously described pressure regulating valve.

[0040] Below, with reference to the accompanying drawings, three exemplary embodiments of a pressure regulating valve according to the invention are described in detail. The drawings show: Fig. 1 a partially cutaway representation of a fail-safe pressure control valve for controlling or regulating the pressure of a fluid in a pilot pressure chamber with an energizable actuating device, comprising a plunger and a pilot seal arranged on the plunger, wherein the actuating device is unenergized and the pilot seal is in a first position sealingly in contact with a first valve seat in a pilot valve chamber, Fig. 2 an enlarged detail view of the pressure regulating valve according to Fig. 1, Fig. 3 a detailed representation of the pressure regulating valve according to Fig. 1 wherein a pressure is applied in the pilot valve chamber which lifts a spring element from a third valve seat, allowing the fluid to flow through a fail-safe channel from the pilot valve chamber to an outlet, Fig. 4 an enlarged representation of the spring element according to the Fig. 1-3 in the initial state, and Fig. 5 An enlarged view of a spacer ring for positioning the spring element.

[0041] Identical or functionally equivalent parts or features are identified by the same reference numerals in the detailed description of the figures below. Likewise, not all identical or functionally equivalent parts or features in the figures are assigned a reference number.

[0042] Fig. Figure 1 shows a first exemplary embodiment of a fail-safe pressure control valve 1 for controlling or regulating the pressure of a fluid. The pressure control valve 1 can be used, for example, in a vibration damper (not shown), particularly in a motor vehicle, to adjust the damping characteristics of the vibration damper.

[0043] The pressure regulating valve 1 comprises a valve body 10 with at least one inlet I and at least one outlet O. The at least one inlet I can be connected to a pilot pressure chamber. In the accompanying figures, the reference numerals “I” and “O” indicate the areas in which the at least one inlet I and the at least one outlet O could be located.

[0044] The valve housing 10 at least partially encloses a pilot valve chamber 20, in which a first valve seat 21, a second valve seat 22, and a third valve seat 23 are arranged. The first valve seat 21 and the second valve seat 22 are arranged on opposite sides in the longitudinal axis L of the valve housing 10, or more precisely, in the pilot valve chamber 20.

[0045] As shown in particular in the detailed descriptions according to the Fig. 2 can be removed, the valve housing 10 comprises a spring element 30 and a second wall section 40, wherein the first valve seat 21 is arranged on the spring element 30 and the second valve seat 22 is arranged in a second wall section 40.

[0046] The spring element 30 and the second wall section 40 are arranged on opposite sides of the pilot valve chamber 20 in the longitudinal axis L and close off the pilot valve chamber 20 at the end in the longitudinal axis L.

[0047] The pilot valve chamber 20 is connected, among other things, to the at least one outlet O by means of a first through-channel 17. Furthermore, the pilot valve chamber 20 is connected to the at least one inlet I by means of a second through-channel 18, allowing the fluid to flow into the pilot valve chamber 20 through the at least one inlet I and the second through-channel 18, and to flow out through the first through-channel 17 to the at least one outlet O.

[0048] The spring element 30 can, for example, be used as shown in Fig. Figure 4 shows a spring that is essentially disc-shaped and comprises a first sealing section 31, a second sealing section 32 and one or more flow sections 35.

[0049] The first sealing section 31 forms the first valve seat 21, and the second sealing section 32 interacts with a third valve seat 23. In the Fig. 4. Sealing sections 31 and 32 are indicated by dotted lines.

[0050] The spring element 30 also includes the first passage channel 17, wherein the sealing section 31 forming the first valve seat 21 is arranged around the first passage channel 17.

[0051] The first sealing section 31 and the second sealing section 32 are arranged on the side of the spring element 30 facing the pilot valve chamber 20 and are further arranged on a common annular and fluid-tight section of the spring element 30. The first sealing section 31 lies radially inside the second sealing section 32 with respect to the longitudinal axis L.

[0052] With reference to the accompanying Fig. Figure 4 further shows that the spring element 30 is gear- or star-shaped and has several teeth or points, between each of which a flow section 35 is formed. The fluid can flow through the spring element 30 in the respective flow section 35.

[0053] The second wall section 40 includes the second passage channel 18 and the second valve seat 22.

[0054] The valve housing 10 comprises a main housing part 11, the spring element 30, and / or an insertion sleeve 45, which forms the second wall section 40, wherein the insertion sleeve 45 can be inserted into a recess of the main housing part 11. The insertion sleeve 45 comprises the second valve seat 22, wherein the position of the insertion sleeve 45 along the longitudinal axis L relative to the main housing part 11 enables precise positioning of the second valve seat 22 along the longitudinal axis L.

[0055] The main housing part 11 includes the third valve seat 23. The third valve seat 23 can include a valve collar 12 arranged around a pocket forming the pilot valve chamber 20. The valve collar 12 projects from the end face of the main housing part 11 facing away from the pilot valve chamber 20.

[0056] In the Fig. 1 and Fig. In the operating state of the pressure control valve 1 shown in Figure 2, the spring element 30 is pre-tensioned against the third valve seat 23 and closes a fail-safe channel 19 between the at least one outlet O and the pilot valve chamber 20.

[0057] Furthermore, the Fig. It can be seen from Figures 1-3 that the valve housing 10 has a main valve chamber 50 which is fluidically connected on one side to the at least one inlet I and on the other side to the at least one outlet O. According to the illustrated embodiment, a main valve spool 54 can be arranged in the main valve chamber 50, which is held against a main valve seat 51 by a main valve spring 55.

[0058] The main valve chamber 50 is fluidically arranged between the at least one inlet I and the pilot valve chamber 20. This means that the fluid from the at least one inlet I must first flow through the main valve chamber 50 before it can enter the pilot valve chamber 20 through the second passage 18. For this purpose, the main valve spool 54 has a passage 58 that leads into the Fig. 1-3 is shown.

[0059] Furthermore, the pressure regulating valve 1 has an energizable actuating device 70, wherein the energizable actuating device 70 is preferably formed by a Fig. 1. A hidden electromagnetic actuator can be formed.

[0060] The actuating device 70 can be housed in an actuator housing 72, the actuating device 70 further comprising an excitation coil, an armature and a return spring. The armature can be moved along a longitudinal axis L against a spring force of the return spring in a known manner when the excitation coil is energized.

[0061] The actuator housing 72 has a receiving area formed by a recess into which the valve housing 10 can be at least partially inserted. The valve housing 10 can be fixedly arranged in the receiving area of ​​the actuator housing 72, for example by a positive, force-fit and / or material-fit connection, in particular by pressing it into the receiving area.

[0062] The spring element 30 is clamped between the actuator housing 72 and the main housing part 11. For this purpose, a contact section 33, which can be formed by the free ends of the teeth or serrations, is in operative contact with the actuator housing 72, and the second sealing section 32 is in contact with the main housing part 11. This pre-tensions the spring element 30 against the third valve seat 23, allowing it to seal against the third valve seat 23 and close the fail-safe channel 19.

[0063] A spacer ring 36 can determine the position of the spring element 30, particularly in a plane perpendicular to the longitudinal axis L. The spacer ring 36 is in Fig. Figure 5 shows the spring element 30 preferably surrounding it radially and can furthermore define a distance between the main housing part 11 and the actuator housing 72. This distance defines the preload of the spring element 30, which in turn causes the spring element 30 to be shaped into a concave form.

[0064] By varying the thickness of the spacer ring 36 and / or the spring element 30, the preload or spring rate of the spring element 30 and thus the characteristic of the hydraulic failsafe curve can be varied and adapted to customer requirements.

[0065] The spacer ring 36 is not completely closed, but forms an outflow channel 37 through which the fluid can flow from the first and / or third valve seat 21, 23 to at least one outlet O. The spacer ring 36 is therefore not a completely closed ring and encloses an angular dimension β << 360°, more preferably β ≈ 300°.

[0066] Furthermore, the pressure regulating valve 1 has a plunger 60, wherein the plunger 60 can be moved by the actuating device 70 along the longitudinal axis L against a force of a return spring (not shown). For this purpose, the plunger 60 is preferably connected to the armature and can also be – as shown in the Fig. 1 is shown - held movable by means of bearing elements 74 on the actuator housing 72 along the longitudinal axis L.

[0067] The plunger 60 protrudes from the actuator housing 72 into the valve housing 10. In particular, as shown in the detailed illustrations of the Fig. 2 to Fig. 3 can be removed, a first free end 61 of the plunger 60 protrudes into the pilot valve chamber 20.

[0068] Furthermore, it can be seen from the accompanying figures that the plunger 60 has a pressure equalization bore 64 through which fluid can flow along the longitudinal axis L of the plunger 60. Consequently, the fluid can flow from the first free end 61 through the plunger 60 into a pressure equalization chamber (not shown) opposite the armature, thereby equalizing the pressure and allowing the pressure control valve 1 to be pressure-balanced.

[0069] The plunger 60 further comprises a pilot seal 65, which is fixedly arranged on the plunger 60, preferably adjacent to the free end 61. The pilot seal 65 can, for example, be fastened to the plunger 60 by means of a retaining ring 68, as shown in the accompanying figures.

[0070] The pilot seal 65, according to the specifications in the Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. The embodiment shown in 5 includes a disk element, preferably designed in the manner of a disk-shaped flat spring element.

[0071] In the depicted unactuated state of the actuating device 70 according to the Fig. 1 - 3 The pilot seal 65 is positioned in a first position by means of the return spring. In the first position, the pilot seal 65 rests against the first valve seat 21, sealing it and closing the first passage 17.

[0072] In the first position of the pilot seal 65, the fluid from the pilot valve chamber 20 cannot flow through the first passage 17 towards the at least one outlet O. In other words, the pilot valve chamber 20 is closed on the outlet side in this first position A.

[0073] In an actuated state (not shown) of the actuating device 70, the excitation coil of the actuating device 70 is energized slightly, for example by means of 0.4A, and the pilot seal 65 is moved from the first valve seat 21 towards the second valve seat 22.

[0074] In this position of the pilot seal 65, the fluid can flow both from the pilot valve chamber 20 through the first passage channel 17 towards the at least one outlet and from the at least one inlet I through the second passage channel 18 into the pilot valve chamber 20.

[0075] In another (not shown) actuated state of the actuating device 70, the excitation coil of the actuating device 70 receives a stronger current and the pilot seal 65 comes into contact with the second valve seat 22. In the second position B, the pilot seal 65 seals against the second valve seat 22 and closes the second passage channel 18.

[0076] In this second position of the pilot seal 65, the pilot seal 65 presses against the second valve seat 22, and depending on the current applied, controls the pilot seal to lift off from the second valve seat 22 only at higher pressures and to allow the fluid to flow from the at least one inlet I into the pilot valve chamber 20.

[0077] Fig. Figure 3 shows a state of the pressure control valve 1 in which the fail-safe channel 19 is released and the fluid can flow from the pilot valve chamber 20 to the at least one outlet O in the unactuated state of the actuating device 70, with the flow path being shown by a dashed line.

[0078] This condition can occur, for example, in the event of a power failure and / or a failure of the actuating device 70. As soon as pressure is present in the pilot valve chamber 20, this pressure acts against the spring element 30 and can further deform it, thereby lifting the second sealing section 32 from the third valve seat 23. This opens the fail-safe channel 19 and allows damping characteristics to be achieved despite the failure.

[0079] The pilot seal 65 remains in sealing contact with the first valve seat 21 formed by the spring element, since it can follow the displacement of the first valve seat 21 along the longitudinal axis L during an idle stroke by the spring force of the return spring. Reference symbol list 1 pressure regulating valve 10 Valve housings 11 Main housing part 12 valve collars 17 first passage channel 18 second passage channel 19 fail-safe channels 20 Pilot valve chamber 21 first valve seat 22 second valve seat 23 third valve seat 30 spring element 31 first sealing section 32 second sealing section 33 Contact section 34 Breakthrough 35 Flow section 36 spacer ring 37 Outflow channel 40 second wall section 45 Insert socket 50 Main valve room 51 Main valve seat 54 Main valve slide 55 Main valve spring 60 pestles 61 free ending 64 Pressure equalization bore 65 Pilot seal 68 retaining ring 70 Actuating device 72 actuator housings 74 Bearing element L Longitudinal axis

Claims

Pressure regulating valve (1), in particular fail-safe pressure regulating valve (1), for controlling or regulating the pressure of a fluid in a pilot pressure chamber, comprising: - a valve body (10) with at least one inlet (I) that is fluidically connectable to the pilot pressure chamber, and with at least one outlet (O), wherein a pilot valve chamber (20) is arranged between the at least one inlet (I) and the at least one outlet (O), which is fluidically connected to the outlet (O) via a first passage (17) and to the inlet (I) via a second passage (18); - a plunger (60) and a pilot seal (65); - wherein the plunger (60) is movable along a longitudinal axis (L) by means of an energizable actuating device (70), and the pilot seal (65) is movable between a first position in which the pilot seal (65) abuts the first valve seat (21) and the first passage (17). closes, and a second position,in which the pilot seal (65) abuts the second valve seat (22) and closes the second passage (18), can move along the longitudinal axis (L), characterized in that the valve housing (10) comprises a spring element (30) which has the first valve seat (21) and which is biased against a third valve seat (23) and closes a fail-safe channel (19) between the at least one outlet (O) and the pilot valve chamber (20). Pressure regulating valve (1) according to one of the preceding claims, characterized in that the spring element (30) comprises a first sealing section (31) and a second sealing section (32) and that the first sealing section (31) interacts with the first valve seat (21) and the second sealing section (32) interacts with the third valve seat (23). Pressure regulating valve (1) according to claim 2, characterized in that the first sealing section (31) is arranged within the second sealing section (32). Pressure regulating valve (1) according to one of claims 2 or 3, characterized in that the first sealing section (31) and the second sealing section (32) are arranged on the side facing the pilot valve chamber (20). Pressure regulating valve (1) according to one of the preceding claims, characterized in that the spring element (30) closes off the pilot valve chamber (20) on one side along the longitudinal axis (L). Pressure regulating valve (1) according to one of the preceding claims, characterized in that the spring element (30) has an opening (34) around which the first valve seat is formed. Pressure regulating valve (1) according to one of the preceding claims, characterized in that the spring element (30) is concave or flat. Pressure regulating valve (1) according to one of the preceding claims, characterized in that the spring element (30) has at least one flow section (35) through which the fluid can flow from the third valve seat (23) to the at least one outlet (O). Pressure regulating valve (1) according to one of the preceding claims, characterized in that the valve housing (10) is inserted into an actuator housing (72), and that the spring element (30) is held between the actuator housing (72) and the valve housing (10). Pressure regulating valve (1) according to one of the preceding claims, characterized in that the spring element (30) is held in position by a spacer ring (36). Pressure regulating valve (1) according to claim 10, characterized in that the spacer ring (36) has an outflow channel (37) through which the first passage channel (17) and / or the fail-safe channel (19) are or is guided. Pressure regulating valve (1) according to one of the preceding claims, characterized in that the pilot valve chamber (20) is formed in the valve housing (10), and that the first valve seat (21) and the second valve seat (22) are arranged on opposite sides of the pilot valve chamber (20). Pressure regulating valve (1) according to one of the preceding claims, characterized in that the valve housing (10) has a second wall section (40) which comprises the second valve seat (22). Pressure regulating valve (1) according to claim 13, characterized in that the second wall section (40) comprises an insertion bushing (45). Pressure regulating valve (1) according to one of the preceding claims, characterized in that the valve housing (10) comprises a main valve chamber (50) in which a main valve spool (54) is arranged which is preloaded against a main valve seat (51) by means of a main valve spring (55). Pressure regulating valve (1) according to claim 15, characterized in that the main valve spool (54) is designed as a proportional spool. Pressure regulating valve (1) according to one of the preceding claims, characterized in that the actuating device (70) is pressure balanced. Pressure regulating valve (1) according to one of claims 10 to 17, characterized in that a failsafe characteristic curve can be set by a thickness of the spacer ring (36) and / or the spring element (30). Vibration damper with a pressure regulating valve (1) according to one of the preceding claims.

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