Valve

Abstract

The invention relates to a valve, in particular a seat valve, comprising: a valve housing (10) which has two fluid ports (1, 2) for conducting fluid; an actuating device (12) for actuating a valve piston (14) which is longitudinally displaceably guided in the valve housing (10); a first fluid port (1) which opens axially in the direction of a free end face of the valve piston (14); a second fluid port (2) which opens radially in the direction of a circumferential wall (13) of the valve piston (14); and a check valve function which is integrated into the valve, wherein an extension (54) is provided at the free end face of the valve piston (14) in order to realise a diaphragm function, which extension, in a position which prevents the fluidic connection (56) between the fluid ports (1, 2), engages into the valve housing (10) with the axial fluid port (1), wherein, when fully engaged, a closed seat valve (58) is formed between parts of the valve housing (10) and the valve piston (14), wherein, when the fluidic connection (56) is released, the fluid flow between the two fluid ports (1, 2) is throttled, and wherein, at least when the seat valve (58) is closed, the check valve function is realised in which a fluidic connection (56) from the axial (1) to the radial fluid port (2) is enabled.

Description

[0001] valve

[0002] The invention relates to a valve, in particular a seat valve, with a valve housing which has two fluid connections for conducting fluid and with an actuating device for actuating a valve piston which is guided longitudinally displaceably in the valve housing, with a first fluid connection which opens axially in the direction of a free end face of the valve piston and with a second fluid connection which opens radially in the direction of a circumferential wall of the valve piston, as well as with a check valve function integrated in the valve.

[0003] From DE 10 2012 015 354 A1 a valve is known, in particular a pilot-operated proportional directional control valve, with a valve housing which has a fluid inlet and a fluid outlet, wherein the fluid flow between the fluid inlet and the fluid outlet can be regulated by a valve piston, wherein a pilot valve chamber is provided on a rear side of the valve piston with a pilot valve closing element which can be moved by an actuating device and with which the fluid flow between the pilot valve chamber and the fluid outlet can be regulated, wherein an inlet orifice is arranged between the fluid inlet and the pilot valve chamber, the opening cross-section of which can be reduced by a control element.Furthermore, a maximum volume flow regulator is provided within the valve housing. This regulator, similar to a spring-loaded check valve, has a control piston that is acted upon on one side by the pressure of the fluid flowing from the pilot chamber and on the other side by a compression spring. A flow regulator is thus integrated within the valve, and the inlet orifice cross-section, which can be reduced by means of the control element, causes the pressure in the pilot valve chamber to drop, thus opening up the possibility of actively regulating the opening stroke of the valve piston in addition to the regulation at the pilot valve seat. The smaller the differential pressure between the fluid inlet and fluid outlet, the larger the opening stroke of the valve can be adjusted, which is what enables the flow control function.

[0004] From the subsequently published patent application DE 10 2022 004 033.6, a generic valve is known with a valve housing which has two fluid connection points for conducting fluid and with an actuating device for actuating a valve piston of a seat valve accommodated in the valve housing, wherein a check valve is accommodated in the valve housing together with the seat valve and wherein at least one bypass line runs in the valve housing, which bypasses the check valve and forwards a fluid flow present at one fluid connection point, which is controllable by the valve piston of the seat valve, in the open state of the latter in the direction of a valve chamber.The check valve integrated in the valve housing is capable, if required, of discharging fluid on the consumer side via the valve into the subsequent fluid circuit at a very low opening pressure and with low flow loss, while again having a relatively large opening cross-section.

[0005] The known valve can therefore be very well combined with hydraulic damping cylinders as the respective consumer, especially in the form of so-called stabilizers as part of a vehicle's chassis. This allows the respective stabilizer to be designed to be stiffer for cornering than for off-road driving, where a soft suspension deflection is generally desired.

[0006] Based on this prior art, the object of the invention is to further improve the known valve solutions while retaining their aforementioned advantages.

[0007] A valve having the features of patent claim 1 in its entirety solves this problem.

[0008] Because, according to the characterizing part of patent claim 1, an extension is provided on the free end face of the valve piston for the realization of a diaphragm function, which extension engages in the valve housing with the axial fluid connection in a position that prevents the fluid connection between the fluid connections, that a closed seat valve is formed with a complete engagement between parts of the valve housing and the valve piston, that when the fluid connection is released, the fluid flow between the two fluid connections is throttled, and that when the seat valve is closed, the check valve function is realized, in which a fluid connection from the axial to the radial fluid connection is released, the volume flow can be directed in one flow direction via a check valve with a very low opening pressure and low flow losses,In the opposite direction, the volume flow can be opened or closed (NC - Normally Closed) depending on the application of an electric current to the seat valve, in particular in the form of a seat-tight 2 / 2-way valve. The volume flow in the main direction is influenced by the orifice function of an integrated orifice. The generic valve in the prior art integrates, in addition to the solenoid-operated directional seat valve, a check valve and an orifice in a common valve housing in the manner of a combination valve, the implementation of which requires numerous components and, in addition, the machining of the valve body, in particular due to the long,A thin bore for the bypass line past the check valve is very complex to implement and therefore costly. The inventive solution allows the same objective for the valve function to be pursued as for the generic prior art, but the required functions are achieved with fewer valve components. Furthermore, the inventive valve solution is significantly more compact, allowing the valve to be reliably integrated even in cramped installation conditions. Furthermore, due to the structurally simpler design—without a bypass line—the valve can be implemented cost-effectively.

[0009] In a preferred embodiment of the valve according to the invention, a valve pilot control is provided with a valve or control part, in particular a control cone, which controls an orifice in a fluid channel of the valve piston and is part of a valve control system that interacts with a decoupling device. Preferably, the valve control system is designed as a rod with a single actuating rod, which interacts with the decoupling device in a space-saving arrangement in series. Without such decoupling by means of the decoupling device, the required check valve function would only respond at a significantly higher pressure level, which is undesirable.

[0010] In a further preferred embodiment of the valve according to the invention, the decoupling device comprises a spring arrangement with a main spring, which serves to adjust the actuating force of the actuating device, and with an additional or auxiliary spring, which serves to adjust the opening pressure for the check valve function. In this respect, the additional or auxiliary spring, designed as a check valve spring, also simultaneously serves to decouple within the framework of the decoupling device, so that the magnetic force does not act directly on the valve piston, but preferably only indirectly on the main spring. Both the main spring and the additional or auxiliary spring each represent an energy store, in particular in the form of a single compression spring with a predeterminable spring stiffness.

[0011] In a further preferred embodiment of the valve according to the invention, the main spring is arranged between a magnet armature of the actuating magnet device and a pole tube end of the pole tube, with its free end regions engaging both in a recess of the magnet armature and in a recess in the pole tube end. Preferably, it is further provided that the additional or auxiliary spring is accommodated in a receiving opening in the magnet armature, rests with one free end on the magnet armature, and with its other free end on an actuating rod part of the valve control, which is guided at least partially longitudinally in the magnet armature.In this way, the decoupling device with the aforementioned spring arrangement comprising two compression springs is integrated in an extremely space-saving manner within the valve housing in the axial direction together with the longitudinally movable valve piston and is extremely small, particularly when viewed in the axial actuation direction of the valve.

[0012] For reliable control of the valve, it is further provided that the additional or auxiliary spring is equipped with a lower spring stiffness than the main spring, which, viewed in the longitudinal direction of the travel movement of the magnet armature and in a coaxial arrangement and adjacent to the auxiliary or additional spring in the direction of the pole tube end, follows. In this way, a reliable, obstruction-free design for the decoupling device is achieved. In a preferred embodiment of the valve according to the invention, it is provided that the extension is formed from a hollow cylindrical wall section which, when the seat valve is closed, engages in a hollow cylindrical recess in the valve housing with the axial fluid connection, forming a gap, in particular forming an annular gap.In this way, the hollow cylindrical components of the valve ensure reliable guidance of the valve piston with a defined opening or closing of the orifice cross-section via the extension. The gap mentioned, particularly in the form of an annular gap, supports the realization of the orifice effect and serves to throttle the fluid flow.

[0013] In a further preferred embodiment of the valve according to the invention, the part on the valve piston that forms the valve seat is formed from an annular surface that tapers into a cone in the direction of the axial fluid connection, in particular in the form of a truncated cone, and that adjoins the extension in the direction of the actuating device. In this way, a fluid-tight blocking of the fluid connections from one another is achieved via the conical valve seat.

[0014] In a further preferred embodiment of the valve according to the invention, the annular surface is adjoined in the direction of the actuating device by a further annular surface, which is designed to be interrupted and project transversely to the actuating direction on the valve piston, at least when the non-return function is triggered, and is guided at least partially movable along an inner side of the valve housing, at least partially enclosing the valve piston. In this way, the valve piston can be reliably controlled by means of the further annular surface in the valve housing at the appropriate fluid pressure at the radial fluid connection.

[0015] In a further preferred embodiment of the inventive

[0016] The valve is provided with a fluid channel passing through the valve piston, in which a valve cone, guided longitudinally, controls an orifice in the fluid channel with its cone tip. A closing part, in particular in the form of a closing ball, is preferably accommodated in a receiving space in the valve piston in the fluid channel between the orifice for the valve cone and the hollow cylindrical wall section of the extension.

[0017] In this context, it is preferably further provided that a radial orifice is introduced into the valve piston, which, at least when the seat valve is closed, establishes a fluid-carrying connection between the radial fluid connection in the valve body and a valve chamber in the valve piston with the valve cone accommodated therein. Advantageously, the valve cone is part of a rod-like valve control which, whether designed in one piece or intermittently, engages at least partially with one of its free ends, opposite the valve cone, in a magnet armature of the energizable actuating device and can be controlled by means of the same in a longitudinally movable manner. In this way, functionally reliable pilot control for the valve piston or main piston is achieved.

[0018] In another particularly preferred embodiment of the valve according to the invention, a restoring force is exerted on a magnet armature actuated by the actuating device by means of at least one energy accumulator, preferably in the form of a compression spring. Preferably, several compression springs are used as energy accumulators, with a main spring being provided against which the magnet armature of the actuating device works, and a further spring allowing an opening pressure to be specified at which the check valve function is activated.

[0019] Furthermore, the invention relates to a method for operating a valve as presented above, wherein in a "pulling" actuation system, a fluid connection between the two fluid connections is blocked when de-energized, and a fluid connection from the radial fluid connection to the axial fluid connection is released when energized,

[0020] - a check valve function is enabled from axial to radial fluid connection both when de-energized and when energized.

[0021] In the following, the solution according to the invention is explained in more detail using an exemplary embodiment according to the drawing. In this diagram, the

[0022] Figures 1 to 4 show in the form of a longitudinal section the valve with

[0023] "pulling" operating device in the positions

[0024] - de-energized in the closed state (Figure 1),

[0025] - powered with the possibility of a fluid connection from radial to axial fluid connection (Figure 2),

[0026] - de-energized or energized with actuated check valve function from axial to radial fluid connection (Figure 3 or 4).

[0027] The valve shown in longitudinal section in Figure 1 as an exemplary embodiment forms a seat valve, with a valve housing 10 that has two fluid connections 1, 2 for conducting fluid. While the fluid connection 1 engages axially at the front in the free end of the valve housing 10, the fluid connection 2 is formed as a radial fluid connection from several bores, for example four bores, which are grouped diametrically opposite one another around the longitudinal or actuating axis of the valve and which penetrate the valve housing 10 and are arranged radially. In this respect, the fluid connection 2 opens radially inwards in the direction of a peripheral wall 13 of a valve or main piston 14. The valve housing 10 and thus the valve as a whole can be accommodated in the usual way in a valve block (not shown in detail) by means of appropriate sealing and guiding systems.In particular, the fluid connections 1, 2, which are connected to fluid guides in the valve block, are separated from each other in a fluid-tight manner by the lower sealing and guide system as viewed in the direction of Figure 1. The fluid is preferably a hydraulic medium, such as hydraulic oil; however, other fluids can also be controlled using the valve shown.

[0028] The valve as a whole has an actuating device, designated 12, for actuating the valve piston 14 or main piston, which is guided longitudinally in the valve housing 10. The actuating device 12, which is also referred to in technical terms as an actuating magnet system, conventionally has a coil winding 16, which can be energized by means of a plug part 18 arranged on the head side. The plug part 18 is to be connected to a suitable power source with a suitable switch or control arrangement. The coil winding 16 is accommodated in a coil receptacle 20, which is preferably made of an electrically insulating plastic material. The coil winding 16, together with the associated coil receptacle 20, conventionally comprises a pole tube 22 with a magnetic separation 24 introduced on the outer circumference.As viewed in the direction of Figure 1, the pole tube 22 is integrally closed at its upper end by a cylindrical, block-like pole tube end 26 as part of the pole tube 22. A pole core 28 is integrally connected to the pole tube 22 at its lower, free end face. The pole tube end 26 thus also serves as a type of pole core and seals the interior of the actuating device 12 from the environment. The pole core 28, which widens outward in a stepped manner, is provided on its underside with a cylindrical recess 30 into which an upper end of the valve housing 10 engages. A seal is provided between the valve housing 10 and the pole core 28 in the region of the recess 30. Furthermore, a cylindrical magnet armature 34 is guided longitudinally in the hollow cylindrical pole tube 22, which, as viewed in the direction of Figure 1, is in its lowest unactuated position in which the actuating magnet system 12 is de-energized.To avoid obstructions during operation, the magnet armature 34 is completely penetrated by a through-hole 36, which opens into the open at the free end faces of the magnet armature 34. In its lower stop position shown in Figure 1, one free end face of the magnet armature 34 is in contact with the top of the valve housing 10.

[0029] The actuating device 12 is externally enclosed by a hollow-cylindrical receiving body 38 in the form of a housing shell, preferably made of metal material, which is secured to the pole core 28 on its lower, free end face by a type of flanged connection 40 on an annular outer circumferential groove along the outside of the pole core 28. Any remaining free space between the tubular receiving body 38 and the actuating device 12 is filled with a potting compound 42, which is sealed at its upper exit area from the receiving body 38 in the direction of the plug part 18 by a sealing connection with respect to the inside of the receiving body 38.

[0030] A rod-like valve control 44 engages the underside of the magnet armature 34 in the form of an actuating rod, which engages at its one free upper end region in a receiving opening 46 in the magnet armature 34 in a coaxial direction to the magnet armature 34 and is thus guided axially displaceably therein. In the unactuated state, the upper free end face of the magnet armature 34 has a predeterminable axial distance from the adjacent underside of the pole tube-side base or end part 26 in the form of an annular space 48. Furthermore, the underside of the magnet armature 34 rests at least partially flat on the adjacent upper side of the valve housing 10.If, as already indicated, the coil winding 16 is energized via the associated plug part 18, the magnet armature 34 moves, as viewed in the direction of Figure 1, from its unactuated lower end position into an upper functional position which actuates the valve and in this way exerts a pulling force on the following components via the rod-like valve control 44 or the actuating rod, which will be explained in more detail below.

[0031] For the check valve function, the valve has a check valve, designated as a whole by 52, the function of which will be explained in more detail below. However, to implement a so-called orifice function, an extension 54 is provided on the free end face of the valve piston 14 in the manner of an extension, which engages in the valve housing 10 with the axial fluid connection 1 when the valve is in a position that prevents the fluid connection 56 between the fluid connections 1, 2.When the extension 54 fully engages the annular housing parts 60 of the valve housing 10, which delimit the axial fluid connection 1, as shown in Figures 1 and 2, a closed seat valve 58 is formed between adjacent parts of the valve housing 10 and the valve piston 14, wherein the seat valve 58 initially throttles the fluid flow between the two fluid connections 1, 2 by releasing the fluid connection 56. Furthermore, when the seat valve 58 is closed, the check valve function is realized using the check valve 52 formed in this way, in which a fluid connection 56 from the axial fluid connection 1 to the radial fluid connection 2 is ultimately released as soon as the fluid pressure at the axial fluid connection 1 is greater than the closing pressure of the valve.

[0032] While in the de-energized state of the actuating device 12 after the

[0033] Figure 1 shows the seat valve 58 is closed per se and the extension 54 is in engagement with the valve housing parts 60 of the fluid connection 1, Figure 2 shows the energized state of the valve according to Figure 1, in which the magnet armature 34 is actuated accordingly and moved upwards, moving or releasing the valve piston 14, ie enabling an open state for the seat valve 58, in which the two fluid connections 1, 2 increasingly come into fluid-carrying connection with one another. In this respect, it follows from the de-energized, closed valve state according to Figure 1 that the extension 54 formed from a hollow cylindrical wall section 59, when the seat valve 58 is closed, fits precisely into this connection 1 up to a gap opening in the form of an annular gap 61, formed from the outer circumference of the extension 54 of the valve piston 14 with a reduced diameter and the hollow cylindrical recess 60 in the valve housing 10 with the axial fluid connection 1.In this respect, the outer circumference of the wall section 59 moves in both actuation directions of the valve along the circular-cylindrical inner wall of the recess 60, seen in cross-section. The part on the valve piston 10 which forms the valve seat of the seat valve 58 consists of an annular surface 62 which tapers into a cone in the direction of the axial fluid connection 1 (Figure 3). Furthermore, the seat valve 58 with its valve seat on the side of the valve housing 10 at the transition point to the radial fluid connection 2 is formed, on the one hand, from a circumferential inclined surface 64, against which the conical annular surface 62 of the valve piston 14 can run, in order to thus establish the fluid-tight connection between the connections 1, 2. The corresponding annular surface 62 of the valve piston 14 is directly adjacent to the extension 54 in the direction of the actuating device 12.

[0034] Furthermore, a further annular surface 66 adjoins the aforementioned conical annular surface 62 in the direction of the actuating device 12. This annular surface 66 is preferably circumferentially interrupted to allow fluid passage and projects transversely to the actuating direction on the valve piston 14. At least when the check valve function is triggered (Figures 3 and 4), it is guided in this region so as to be at least partially movable along an inner side 68 of the valve housing 10, wherein the inner side 68 rotationally symmetrically surrounds the valve piston 14 at least partially. The outer diameter of the further annular surface 66 is in any case larger than the components of the seat valve 58 and larger than the outer diameter of the extension 54.

[0035] As can further be seen from Figures 1 to 4, the valve piston 14 is centrally penetrated by a fluid channel 70, in which a valve or control cone 72 is guided so as to be at least partially longitudinally movable, with its cone tip at its lower end, controlling an orifice 74 in the fluid channel 70. In the aforementioned fluid channel 70, between the orifice 74 for the valve cone 72 and the hollow cylindrical wall section 59 of the extension 54, a closing part 76 (Figures 3 and 4), in particular in the form of a closing ball, is received in a receiving space 78 in the valve piston 10, wherein the receiving space 78 is closed off in the direction of the axial fluid connection 1 by a fluid-permeable plate 80, such as a sieve plate, in order to prevent the closing part 76 from accidentally falling out of the valve.

[0036] A radial orifice 82 or throttle is incorporated in the valve piston 14 in the usual manner, which, at least when the seat valve 58 is closed, exclusively establishes a fluid-carrying connection between the radial fluid connection 2 in the valve body 10 and a valve chamber 84 in the valve piston 14 with the valve cone 72 accommodated therein. The valve cone 72 in the valve chamber 84, together with its associated control, is also technically referred to as the valve pilot control of the valve.

[0037] As can also be seen from the figures, the valve piston 14 is guided along its upper outer circumference along circumferential guide and lubrication grooves 86 along the cylindrical inner side 68 of the valve housing 10. Between the area of ​​the valve piston 14 with the guide grooves 86 and the further projecting annular surface 66 there is an annular groove 88 (Figure 3), the axial length of which is in any case dimensioned such that in the closed state of the valve, for example as shown in Figure 1, the radial fluid connection 2 is in fluid-conducting communication with the valve chamber 84, namely via the radially introduced orifice 82. In the thus closed position of the valve, the further annular surface 66 opens out approximately centrally to the central bore axis of the bores of the radial fluid connection 2.In this respect, the annular surface 66 forms the pressure-effective rear side of a transversely extending shoulder between the conical annular surface 62 and the circumferential annular groove 88 in the valve piston 14.

[0038] Preferably, the valve cone 72 is a part of the rod-like valve control 44 in the form of an actuating rod formed in one piece. In the aforementioned embodiment of the valve according to the invention, a so-called pulling magnet system is used.

[0039] In the embodiment shown, a main spring 100 engages between the bottom or end part 26 of the pole tube 22 and the magnet armature 34, which is arranged between parts of the pole tube 22 and the valve housing 10 with the valve or main piston 14. The main spring

[0040] 100 engages over a longer distance into a central recess

[0041] 101 in the pole tube end in the form of the base or end part 26, as well as into a further central recess 103 in the magnet armature 34, arranged in axial extension, and specifically over a shorter distance. The working capacity of the compression or main spring 100 is such, however, that it passes through the annular space 48 in a de-energized initial state. Furthermore, an additional or auxiliary spring 110, arranged coaxially to the main spring 100 and essentially forming a check valve spring, is arranged in a cylindrical recess 116 in the magnet armature 34. This recess 116 is delimited in the direction of the valve piston 14 by an end ring 118, for example in the form of a retaining ring or circlip.The intended groove or spacing width between a flange-like widening 108 of the rod-like valve control 44 and the adjacently arranged end ring 118 in the non-energized, closed valve state according to Figure 1, serves to specify the opening stroke for the valve piston 14 within the scope of the check valve function.

[0042] As can be further seen from Figures 1 to 4, only a single actuating rod is required for the rod-like valve control 44, which carries the valve cone 72 at its lower free end for engagement with the associated orifice 74 in the valve piston 14. If a higher load pressure is present at the radial connection 2 than at the axial fluid connection 1, this pressure is continued via the inlet orifice bore 82 in the valve piston 14 to the rear area 114 of the valve piston 14. Since the rear piston area is larger than the front area, a closing force acts on the valve piston 14.

[0043] If the pulling actuating magnet system 12 is electrically actuated, the magnet armature 34 is attracted from its de-energized closed position according to Figure 1 against the force of the main spring 100 towards the upper parts of the end part 26 and in doing so takes the rod-like valve control 44 with it, which in turn opens the pilot control orifice with the components 72, 74 in the valve piston 14, as shown in Figure 2. A pilot control volume flow is established via the corresponding inlet orifice, the pressure drop of which leads to an opening force on the valve piston 14, whereby the latter follows the movement of the guide rod in the form of the rod-like valve control 44 upwards.Since the solenoid stroke is designed to be significantly smaller compared to other pilot-operated 2 / 2-way seat valves, the valve piston 14 only partially opens to bring about the orifice function within the framework of a fluid flow from the radial fluid connection 2 to the axial fluid connection 1, with the hollow cylindrical extension 54 of the valve piston 14 only slightly extending from the hollow cylindrical recess 60 in the valve housing 10 in the area of ​​the axial fluid connection 1 in order to establish a fluid connection 56, initially throttled, via the annular gap 61. When the check valve function is fully activated, the valve piston 14, as shown in Figures 3 and 4, abuts with its rear region 114 against a stop 120 which runs transversely to the actuation direction of the rod-like valve control 44 within the valve housing 10 and is penetrated by this control 44 in the form of the actuation rod with the associated rod part 90.

[0044] If, in turn, a higher pressure level is present at the axial fluid connection 1 than at the radial fluid connection 2, this axial pressure acts on the free end face of the valve piston 14 and causes an opening force on the corresponding valve piston 14. This force is in turn transmitted via the rod-like valve control 44 to the check valve spring 110, which is designed to be weaker in accordance with the underlying specification, and as already mentioned, the distance between the end ring 118 and the flange-like widening 108 of the rod-like valve control 44 defines the possible opening stroke within the scope of the check valve function.

[0045] With the valve solution shown, the volume flow can be directed via the check valve 52 in one flow direction from an axial fluid connection 1 to a radial fluid connection 2 at a very low opening pressure and with minimal flow losses. In the opposite direction, i.e., from the radial fluid connection 2 to the axial fluid connection 1, the volume flow is released depending on the application of an electrical current to the seat-tight 2 / 2-way valve (NC - Normally Closed). The volume flow in the main direction is influenced by the integrated orifice plate using the axial extension 54 on the valve piston 14 in conjunction with the hollow cylindrical recess 60 in the valve housing 10 in the area of ​​the axial fluid connection 1. This has no equivalent in the prior art.

Claims

Patent claims 1. A valve, in particular a seat valve, comprising a valve housing (10) having two fluid connections (1, 2) for conducting fluid, and comprising an actuating device (12) for actuating a valve piston (14) guided longitudinally in the valve housing (10), comprising a first fluid connection (1) opening axially toward a free end face of the valve piston (14), and a second fluid connection (2) opening radially toward a circumferential wall (13) of the valve piston (14), as well as a check valve function integrated in the valve, characterized in that an extension (54) is provided on the free end face of the valve piston (14) to implement a diaphragm function, which extension engages the valve housing (10) with the axial fluid connection (1) in a position preventing the fluid connection (56) between the fluid connections (1, 2),that upon complete engagement between parts of the valve housing (10) and the valve piston (14), a closed seat valve (58) is formed, that upon release of the fluid connection (56), the fluid flow between the two fluid connections (1, 2) is throttled, and that at least when the seat valve (58) is closed, the check valve function is realized, in which a fluid connection (56) from the axial (1) to the radial fluid connection (2) is released.

2. Valve according to claim 1, characterized in that a valve pilot control with a valve or control part, in particular a control cone (72), is present, which controls an orifice (74) in a fluid channel (70) of the valve piston (14) and which is part of a valve control (44) which cooperates with a decoupling device.

3. Valve according to claim 1 or 2, characterized in that the decoupling device has a spring arrangement with a main spring (100) which serves to adjust the actuating force of the actuating device (12), and with an additional or auxiliary spring (10) which serves to adjust the opening pressure for the check valve function.

4. Valve according to one of the preceding claims, characterized in that the main spring (100) is arranged between a magnet armature (34) of the actuating magnet device (12) and a pole tube end (26) of the pole tube (22) and engages with its free end regions both in a recess (103) of the magnet armature (34) and in a recess (101) in the pole tube end (26).

5. Valve according to one of the preceding claims, characterized in that the additional or auxiliary spring (110) is accommodated in a receiving opening (46) in the magnet armature (34) and is supported with its one free end on the magnet armature (34) and with its other free end on an actuating rod part (90) of the valve control (44), which is guided at least partially longitudinally displaceably in the magnet armature (34).

6. Valve according to one of the preceding claims, characterized in that the additional or auxiliary spring (110) is equipped with a lower spring stiffness than the main spring (100), which, viewed in the longitudinal direction of the travel movement of the magnet armature (34) and in a coaxial arrangement and adjacent to the auxiliary or additional spring (110) follows in the direction of the pole tube end (26).

7. Valve according to one of the preceding claims, characterized in that the extension (54) is formed from a hollow cylindrical wall section (59) which, when the seat valve is closed, (58) forming an annular gap (61) engages in a hollow cylindrical recess (60) in the valve housing (10) with the axial fluid connection (1).

8. Valve according to one of the preceding claims, characterized in that the part on the valve piston (14) which forms the valve seat of the seat valve (58) is formed from an annular surface (62) which tapers into a cone in the direction of the axial fluid connection (1) and which adjoins the extension (54) in the direction of the actuating device (12).

9. Valve according to one of the preceding claims, characterized in that the conical annular surface (62) is adjoined in the direction of the actuating device (12) by a further annular surface (66), which is designed in an interrupted manner and projects transversely to the actuating direction (12) on the valve piston (14), at least when the non-return function is triggered, is guided at least partially displaceably along an inner side (68) of the valve housing (10), which at least partially surrounds the valve piston (14) in contact.

10. Valve according to one of the preceding claims, characterized in that the valve piston (14) is penetrated by a fluid channel (70) in which a valve cone (72) is guided so as to be longitudinally movable and controls with its cone tip an orifice (74) in the fluid channel (70).

11. Valve according to one of the preceding claims, characterized in that in the fluid channel (70) between the aperture for the valve cone (72) and the hollow cylindrical wall section (59) of the extension (54) a closing part (76), in particular in the form of a closing ball, is accommodated in a receiving space (78) in the valve piston (14).

12. Valve according to one of the preceding claims, characterized in that a radial aperture (82) is introduced into the valve piston (14), which at least when the seat valve (58) is closed, creates a fluid-carrying connection between the radial fluid connection (2) in the valve body and a valve chamber (84) in the valve piston (14) with the valve cone (72) accommodated therein.

13. Valve according to one of the preceding claims, characterized in that the valve cone (72) is part of a rod-like valve control (44) which is designed in one piece and at least partially engages with its one free end opposite the valve cone (72) in the magnet armature (34) of the energizable actuating device (12) and can be controlled in a longitudinally movable manner by means of the same.

14. Valve according to one of the preceding claims, characterized in that by means of at least one energy storage device, preferably in the form of the compression or main spring (100), a restoring force can be exerted on a magnet armature (34) which can be actuated by means of the actuating system (12).

15. Method for operating a valve according to one of the preceding claims, characterized in that in a pulling actuating device (12) a fluid connection between the two fluid connections (1, 2) is blocked when de-energized, a fluid connection from radial fluid connection (2) to axial fluid connection (1) is released when energized, and a check valve function from axial (1) to radial (2) fluid connection is released both when de-energized and when energized.

Images