Valve assembly

Abstract

A valve assembly (1) is proposed, comprising two main valves (12, 13) prestressed to a first switching position by spring devices (14), which can be switched to a second switching position by means of associated pilot valves (15, 16). The pilot medium required for switching is supplied with pilot pressure at the pilot joints (18, 22) of each pilot valve (15, 16). The main valves (12, 13) are each equipped with working valve sections (25, 26) fluidly connected to each other. Furthermore, each main valve (12, 13) includes monitoring valve sections (36, 37). The monitoring valve sections (36, 37) are designed such that when the two main valves (12, 13) occupy different switching positions, they cause venting at least one pilot joint (18, 22). This allows for the operation of fluid-operated actuators (2) with a high level of safety.

Description

Technical Field

[0001] This invention relates to a valve assembly.

[0002] - Equipped with a first valve unit having a monostable first main valve prestressed to a first switching position by a spring mechanism with spring force, and an electrically operable first pilot valve (or pre-control valve, i.e., Vorsteuerventil) through which the first main valve can be switched to a second switching position by means of pilot pressure overcoming the spring force and can be held in the second switching position, wherein the pilot pressure is provided by pilot fluid derived from a pilot pressure source, which is connected to the first pilot connector of the first pilot valve via a first pilot passage during operation of the valve assembly.

[0003] - Equipped with a second valve unit having a monostable second main valve prestressed to a first switching position by a spring mechanism, and an electrically operable second pilot valve through which the second main valve can be switched to a second switching position by means of pilot pressure overcoming the spring force and can be held in the second switching position, wherein the pilot pressure is provided by a pilot fluid derived from a pilot pressure source, which is connected to the second pilot connector of the second pilot valve via a second pilot passage during operation of the valve assembly.

[0004] The first main valve has a first working valve section having a plurality of first working connectors. These first working connectors are interconnected and / or separated from each other within the first main valve in a first switching position in a first working configuration and in a second switching position in a second working configuration. The second main valve has a second working valve section having a plurality of second working connectors. These second working connectors are interconnected and / or separated from each other within the second main valve in a first switching position in the first working configuration and in a second switching position in the second working configuration. At least one first working connector and at least one second working connector are implemented as connecting working connectors, and these connecting working connectors are permanently interconnected via a working connection channel system.

[0005] - and wherein at least one of the first or second working joints is an output working joint suitable for connecting a fluid-operated actuator. Background Technology

[0006] A valve assembly of this type, known from EP 2 545 286 E1, comprises two valve units, each having a fluid-guided monostable main valve. The main valve has multiple working connections that are interconnected and / or disconnected from each other in two possible switching positions of the main valve in different operating configurations. The working connections of the two main valves are interconnected in a fixed pattern via a working connection channel system. A fluid-operated actuator can be coupled to the working connection channel system, and this actuator can be operated by means of a pressurized medium flowing through the main valves. The feasible operating configuration of the actuator depends on which of the two main valves is in their respective possible switching positions. Summary of the Invention

[0007] The object of the present invention is to provide a valve assembly that provides a safety function for the safe operation of a connected fluid-operated actuator without the need for external diagnostic measures.

[0008] To achieve this objective, the valve assembly having the features mentioned at the beginning is additionally configured according to the invention as follows:

[0009] - The first main valve has a first monitoring valve section fluidly separated from the first operating valve section. This first monitoring valve section has a plurality of first monitoring connectors, which are interconnected and / or disconnected from each other in a first monitoring configuration when the first main valve is in a first switching position and in a second monitoring configuration different from the first monitoring configuration when the first main valve is in a second switching position.

[0010] - The second main valve has a second monitoring valve section fluidly separated from the second working valve section. This second monitoring valve section has a plurality of second monitoring connectors, which are interconnected and / or disconnected from each other in the first switching position of the second main valve, and in a second monitoring configuration different from the first monitoring configuration in the second switching position of the second main valve.

[0011] - In this configuration, one of the first monitoring connectors of the first monitoring valve section is implemented as a first exhaust monitoring connector communicating with the pressure drop section (Drucksenke), and one of the second monitoring connectors of the second monitoring valve section is implemented as a second exhaust monitoring connector communicating with the pressure drop section. Each additional first monitoring connector and each additional second monitoring connector is connected to a monitoring channel system, which includes both a first pilot channel and a second pilot channel.

[0012] -In particular, the first pilot connector and / or the second pilot connector are connected to the first exhaust monitoring connector and / or the second exhaust monitoring connector via a monitoring channel system, and exhaust is performed therefrom if one of the two main valves occupies its first switch position while the other of the two main valves occupies its second switch position.

[0013] In this way, there exists a valve assembly that provides a so-called dual-channel safety function for the operation of the coupled fluid-operated actuator, more precisely, in such a way that internal self-monitoring of the two main valves occurs, without the need for external diagnostics via sensors and electronic assessments. The valve assembly is constructed such that the required operating functions of the coupled actuator are only achieved when the main valves of both valve units are functioning properly.

[0014] To ensure trouble-free operation, the two main valves are designed to switch synchronously between their two on / off positions. Here, the two main valves are either simultaneously in the first on / off position due to the associated spring mechanism when the pilot valve is deactivated and thus periodically vented, or they are simultaneously in the second on / off position when both pilot valves are activated. The working valve sections of the main valves are configured, for example, to prevent fluid from traveling back and forth to the connected fluid-operated actuator when both main valves are in the first on / off position with a preset first operating configuration. Conversely, if both main valves are simultaneously in the second on / off position and each has a preset second operating configuration, fluid can travel back and forth to the connected actuator. However, this function is only optional and can be implemented in other ways. In any case, according to the invention, when the main valves are switched, not only does the operating configuration preset by the working valve section change, but the monitoring configuration also changes simultaneously. The monitoring configuration is the connection mode of the monitoring connectors of the two monitoring valve sections, wherein each main valve has such a monitoring valve section in addition to its working valve section. When switching the main valves to change the on / off position, not only the operating configuration but also the monitoring configuration of the relevant main valves changes synchronously. Two monitoring valve sections are interconnected via a channel system called the monitoring channel system. One of the monitoring connectors of each monitoring valve section is also permanently connected to a pressure drop section that enables venting and is therefore called a vent monitoring connector. Two pilot channels (each connecting the pilot connector of one of the pilot valves to a pilot pressure source) belong to the monitoring channel system. As long as the two main valves switch synchronously and without interference between the two switching positions, the monitoring valve sections do not affect the overall function of the valve assembly. However, if the two main valves occupy opposite switching positions due to interference—that is, one main valve is in the first switching position and the other is in the second switching position—the resulting monitoring configuration—one monitoring valve section currently defining the first monitoring configuration and the other currently defining the second monitoring configuration—triggers a safety function. This safety function can specifically cause the two main valves to remain in their different switching positions. The safety function manifests in that the pilot connector of at least one of the two pilot valves is connected to at least one of the vent monitoring connectors via the monitoring channel system and thus vents. As a result, the associated pilot valve can no longer be activated, and the current state of the two main valves is frozen in a safe state that prevents unwanted operation of the connected fluid-operated actuators.

[0015] For the implementation of safety functions, the specific functions of the two operating valve sections are irrelevant. Safety-related monitoring functions are only responsible for the pilot valve. This results in minimal fluid consumption, both during operation and at potential fault locations. Because the monitoring valve section of each main valve is fluidly separated from the operating valve section, mutual interference of fluid flow is eliminated, while simultaneously ensuring synchronized configuration changes at both the operating and monitoring connections based on mechanical coupling whenever each main valve actuates.

[0016] Advantageous improvements to the invention are derived from the dependent claims.

[0017] Preferably, a fluid reservoir is arranged in both the first and second pilot channels before the respective associated pilot connectors. The fluid reservoir prevents sudden venting of the associated pilot connectors when the two main valves are not in the same open / closed position, and therefore allows for a delay during the switching of the two main valves without activating the safety function. Even when the pilot channel is connected to one of the vent monitoring connectors, the fluid reservoir maintains the pilot pressure at the pilot valve for a period of time. Therefore, the desired safety function can be guaranteed independently of the switching delay, preventing undesirable responses from the safety function. For example, the fluid reservoir can be designed to accommodate a delay of up to 20 milliseconds.

[0018] The aforementioned delay function can be optimized by arranging a delayed throttling point on the side of the fluid reservoir opposite the associated pilot connector (i.e., upstream of the pilot pressure source), in both the first and second pilot channels. This delayed throttling point causes a delayed fluid outflow when the pilot connector vents. Using such a delayed throttling point allows for permissible behavior even for relatively small fluid reservoirs, enabling a compact design of the valve assembly. In principle, the function of the monitoring valve section is irrelevant as long as the desired effect is achieved. It is particularly advantageous if each monitoring valve section has a 3 / 2 valve function.

[0019] The delayed throttling point can be achieved, for example, by means of a diaphragm, an adjustable throttling screw, or a throttling valve.

[0020] The 3 / 2 valve function is suitably implemented in the two monitoring valve sections such that the first monitoring valve section has three first monitoring connectors and the second monitoring valve section has three second monitoring connectors. The first monitoring valve section, in addition to the first exhaust monitoring connector, includes a first supply monitoring connector and a first connection monitoring connector. The second monitoring valve section, in addition to the second exhaust monitoring connector, includes a second supply monitoring connector and a second connection monitoring connector. The first supply monitoring connector—particularly via a first branch channel of the monitoring channel system—is connected to a second pilot channel, while the second supply monitoring connector—particularly via a second branch channel of the monitoring channel system—is connected to the first pilot channel. Furthermore, a preferred and durable fluid connection between the first and second connection monitoring connectors is achieved by means of the monitoring connection channel.

[0021] Advantageously, the first and second monitoring valve sections are configured such that the first monitoring valve section, belonging to the first main valve, establishes a fluid connection between the first connection monitoring connector and the first exhaust monitoring connector in the first monitoring configuration, and a fluid connection between the first connection monitoring connector and the first supply monitoring connector in the second monitoring configuration. Similarly, the second monitoring valve section, belonging to the second main valve, establishes a fluid connection between the second connection monitoring connector and the second exhaust monitoring connector in the first monitoring configuration, and a fluid connection between the second connection monitoring connector and the second supply monitoring connector in the second monitoring configuration. A third monitoring connector, not currently involved in the corresponding fluid connection, is suitably separated from the fluid connections.

[0022] Advantageously, the second supply monitoring connector is connected to the first pilot channel at a first branch point via a first branch channel of the monitoring channel system. Furthermore, it is advantageous that the first supply monitoring connector is connected to the second pilot channel at a second branch point via a second branch channel of the monitoring channel system. Each branch point is preferably spaced apart both from its associated pilot connector and from the pilot supply connector, to which the pilot pressure source is connected during valve assembly operation.

[0023] As described above, the monitoring channel system preferably has a pilot supply connector that connects to a pilot pressure source during valve assembly operation. Suitably, both the first and second pilot channels are connected to this pilot supply connector. Suitably, in the first pilot channel's traverse, a first input throttling point exists between the pilot pressure source and the first branch point, while in the second pilot channel's traverse, a second input throttling point is arranged between the pilot pressure source and the second branch point. The input throttling points prevent undue air consumption when the associated pilot connector vents air with a safety function enabled.

[0024] The input throttling point can be achieved, for example, by means of a diaphragm, an adjustable throttling screw, or a throttling valve.

[0025] Each input throttling point preferably has a greater flow resistance than the channel branch (Kanalstrang), which extends between the pilot joint and the exhaust monitoring joint in the venting state of the pilot joint and includes a branch channel connected to the associated branch point. This ensures that the fluid throughput during safety-related venting is greater than the flow rate of fluid simultaneously flowing from the pilot pressure source, and thus allows the desired pressure drop to occur at the pilot joint.

[0026] The flow resistance at the delayed throttling point, which is associated with the fluid reservoir, is suitably less than the flow resistance at the input throttling point. However, any individual design is feasible, and thus may have, for example, opposite dimensional relationships or the same flow resistance.

[0027] When switching between the first and second switching positions, each main valve passes through an intermediate position, specifically a central position. During normal operation of the main valves, this is only a brief, temporary intermediate position. The monitoring valve sections are preferably designed with negative overlap in their internal valve structure. Here, in the temporary intermediate or central position, a suitable intermediate configuration is created for the monitoring connectors of the corresponding monitoring valve section, differing from the first and second monitoring configurations, in which all monitoring connectors are fluidly connected to each other. This negative overlap can exist in only one of the two main valves, but is suitable to be achieved in both the first and second main valves.

[0028] The above situation has the effect that if the pilot pressure medium disappears due to a malfunction when switching from the first switch position to the second switch position, the two main valves will switch back to the first switch position via a spring mechanism.

[0029] Furthermore, this situation results in the main valve that is correctly switched to the second switch position immediately moving back to the first switch position via the associated spring mechanism when switching from the first switch position to the second switch position, if the other main valve is stuck in the intermediate or center position.

[0030] Similarly, in the above situation, safety can be ensured by the following: when switching back from the second switch position to the first switch position, the correctly switched main valve cannot switch back to the second switch position if the other main valve gets stuck in the intermediate or central position when switching back. For at least one of the two main valves, preferably each main valve, the working valve section and the monitoring valve section are preferably coordinated with each other such that a first working configuration of the working joint exists in the aforementioned intermediate position, just as in the first switch position.

[0031] To ensure that the operating and monitoring configurations of the same main valve can only be switched synchronously, each main valve preferably has a spool valve (Ventilschieber) that can only move synchronously and uniformly relative to the main valve body of the associated main valve. This spool valve is responsible for both presetting the operating and monitoring configurations of the associated main valve. In other words, the operating valve section and the monitoring valve section of each main valve are suitably associated with the same spool valve, which has only two distinct spool valve sections: one is the operating spool valve section belonging to the operating valve section, and the other is the monitoring spool valve section belonging to the monitoring valve section. These two spool valve sections are mechanically and forcibly coupled, so that they can only move uniformly at all times. In its simplest form, this can be achieved using a one-piece spool valve, although multi-piece spool valves can also be used, where each component forms a spool valve section and is movable and coupled to each other in any manner.

[0032] Each main valve preferably has its own spring mechanism for presetting the first switching position of the main valve. In relation to the main valve structure previously described, the spring mechanism acts on the spool valve and thus simultaneously loads both the working spool valve section and the monitoring spool valve section.

[0033] In a particularly suitable design of the valve assembly, a first working valve section belonging to a first main valve has one or more first working connectors configured as output working connectors for connecting a fluid-operated actuator, while a second working valve section belonging to a second main valve has one or more second working connectors configured as input working connectors for connecting a control valve device for controlling the operation of the actuator. For example, there are two output working connectors to which a double-acting fluid actuator, such as a pneumatic cylinder, can be connected. One output working connector, preferably connected to both input working connectors, is specifically configured to control the direction of the connected fluid-operated actuator when both main valves are in the same switching position and, particularly, simultaneously in the first switching position. The control valve device, for example, has a 5 / 2 or 5 / 3 directional valve function.

[0034] Advantageously, the first working valve section has four first working connectors, and the second working valve section has four second working connectors, wherein two of the first working connectors are configured as two output working connectors, and two of the second working connectors are configured as two input working connectors. Correspondingly, two additional first working connectors are configured as two first connecting working connectors, and two additional second working connectors are configured as two second connecting working connectors. Each first connecting working connector is connected to one of the two second connecting working connectors via its own working connecting channel system. Furthermore, the two output working connectors are connected to one of the two first connecting working connectors respectively in the first switching position of the first main valve, and disconnected from the two first connecting working connectors in the second switching position of the first main valve. Similarly, the two input working connectors are connected to one of the two second connecting working connectors respectively in the first switching position of the second main valve, and disconnected from the two second connecting working connectors in the second switching position of the first main valve.

[0035] In other advantageous designs of the valve assembly, the working valve section is configured to perform the functions of two 3 / 2 valves or two 5 / 2 valves, so as to obtain, for example, a safety valve for safe venting or two 5 / 2 valves for safe reversal. Attached Figure Description

[0036] The invention will now be described in more detail with reference to the accompanying drawings. Wherein:

[0037] Figure 1 A preferred design of the valve assembly according to the invention is shown as a wiring diagram, wherein the operating state of the two main valves is shown when they are in their first switching positions with correct function, and wherein feasible structural designs of the two main valves are schematically shown in the framed view area.

[0038] Figure 2 It shows Figure 1 The valve assembly is in proper functional operating condition, wherein the two main valves are switched to their second on / off positions; and

[0039] Figure 3-9 It shows Figure 1 and 2 The valve assembly has several faulty operating states in which the safety function according to the invention is activated. Detailed Implementation

[0040] Figures 1 to 9 Simplified wiring diagrams illustrate preferred embodiments of the valve assembly 1 according to the present invention under different operating conditions. The valve assembly 1 has two... Figure 1 and Figure 2 The operating status shown in the figure has the specified functions, among which, Figure 1The first correct operating state was shown. Figure 2 The second correct operating state is shown.

[0041] Valve assembly 1 can be used in conjunction with the fluid manipulation of actuator 2. This actuator is, for example, a linear or rotary actuator, as shown. Specifically, it is a double-acting actuator 2 having a driven member 3 that separates two drive chambers 2a, 2b from each other. These drive chambers are controlled to be loaded with a fluid pressure medium, also referred to as the driving pressure medium, to induce a reciprocating driven motion 4 of the driven member 3.

[0042] For example, the control valve device 5 is responsible for the fluid manipulation of the actuator 2. This control valve device has two control valve outputs 6, which are connected to the two drive chambers 2a, 2b of the fluid-manipulated actuator 2 when the valve assembly 1 is connected in the intermediate position. When the valve assembly 1 is in the position of being... Figure 2 In the visible second correct operating state, each control valve output 6 is fluidly connected to one of the drive chambers 2a, 2b, such that the drive chambers 2a, 2b can be pressure-loaded or vented by means of the control valve device 5 to induce the driven motion 4 and, when needed, position the driven component 3 in the desired driven position. This second correct operating state of the valve assembly 1 can therefore also be referred to as the working state. The control valve device 5 preferably functions as a 5 / 2 or 5 / 3 directional valve.

[0043] To fulfill the aforementioned control functions, the control valve device 5 is also connected, in a manner not shown, to a pressure source that provides the driving pressure medium and to a pressure drop section. The driving pressure medium is preferably compressed air, and the pressure drop section is formed by the atmosphere.

[0044] In order to control its operation, the control valve device 5 is suitably connected to the electronic control device 7.

[0045] In valve assembly 1 Figure 1 In the first correct operating state shown, the fluid connection between the control valve output 6 and the drive chambers 2a and 2b is interrupted, making it impossible to control the actuator 2 using the control valve device 5. Therefore, the first correct operating state can also be referred to as the static state of the valve assembly 1.

[0046] If valve assembly 1 is in accordance with Figure 1 If the actuator is in a static state, then the influence of the control valve device 5 on the operating state of the actuator 2 is eliminated. Conversely, the actuator 2 can be controlled by the valve assembly 1. Figure 2 During the visible operating state, the valve assembly 1 is fluidly manipulated by means of the control valve device 5 in order to affect its operating state.

[0047] Valve assembly 1 can be actively and selectively placed in a first or second correct operating state. In this way, the ability to operate the fluid-manipulating actuator 2 by means of the control valve device 5 can be influenced by safety technology. The first correct operating state, also known as the static state, represents a safe state in which operation of the actuator 2 by means of the control valve device 5 is excluded. The currently desired correct operating state is exemplary preset by the already mentioned electronic control device 7, which is suitably a component of valve assembly 1.

[0048] Valve assembly 1 has two valve units, hereinafter referred to as first valve unit 8 and second valve unit 9. Each of these two valve units 8 and 9 has a main valve, which is referred to as first main valve 12 in the case of first valve unit 8 and second main valve 13 in the case of second valve unit 9.

[0049] The two main valves 12 and 13 are monostable structures, and each is prestressed by a spring device 14 with spring force. Figure 1 The first visible switch position.

[0050] Each valve unit 8, 9 has an electrically actuated pilot valve, referred to as the first pilot valve 15 in the case of the first valve unit 8, and as the second pilot valve 16 in the case of the second valve unit 9. Each pilot valve 15, 16 is capable of switching its associated first or second main valve 12, 13 from a first switching position against the spring force of the spring device 14 acting on it. Figure 2 The second switch position is visible and held there. The switching force required for this is provided by a pilot fluid, which is supplied by a pilot pressure source P and is at a sufficiently high pilot pressure, specifically compressed air.

[0051] Each pilot valve 15, 16 can be selectively placed in a deactivated or activated state by means of the electronic control device 7. In the deactivated state, the pilot fluid is separated, and the pilot pressure is removed from the associated main valves 12, 13, thereby holding the main valves 12, 13 in a first operating state by spring force. In the activated state, the main valves 12, 13 are loaded with a pilot pressure opposite to the spring force, thus enabling them to switch to a second switching position against the spring force. The corresponding switching is performed within the range of the switching motion 17 indicated by the double arrows. During specified operation, each main valve 12, 13 maintains its second switching position as long as the associated pilot valves 15, 16 are activated.

[0052] Pilot valves 15 and 16 are, for example, solenoid valves. Each pilot valve 15 and 16 preferably has a 3 / 2 valve function internally, which allows selective connection of the drive surface 33 of the associated main valves 12 and 13 to the pilot pressure source P, or connection to the atmosphere for depressurization.

[0053] To receive pilot fluid at pilot pressure, the first pilot valve 15 has a first pilot connector 18, which is preferably continuously connected to the pilot pressure source P via a first pilot passage 19. Similarly, to receive pilot medium, the second pilot valve 16 has a second pilot connector 22, which is also preferably continuously connected to the pilot pressure source P via a second pilot passage 23, separate from the first pilot passage 19. For example, valve assembly 1 includes a pilot supply connector 24 to which both pilot passages 19 and 23 are connected, and at least during operation of valve assembly 1, the commonly associated pilot pressure source P is connected to this pilot supply connector.

[0054] Each main valve 12, 13 has a working valve section, which is referred to as the first working valve section 25 in the case of the first main valve 12 and the second working valve section 26 in the case of the second main valve 13. The working valve sections 25, 26 are responsible for selectively interrupting or opening the fluid connection between the control valve device 5 and the actuator 2.

[0055] The first working valve section 25 has a plurality of first working joints 27, which are connected to the first main valve 12 by means of... Figure 1 The visible first switch position is in the first operating configuration, and is controlled by the first main valve 12. Figure 2 The visible second switch position in the second operating configuration is interconnected and / or separated from each other in a specific pattern inside the first main valve 12.

[0056] Similarly, the second working valve section 26 has a plurality of second working joints 28, which are connected to the second main valve 13 via... Figure 1 The visible first switch position is in the first operating configuration, and is located by the second main valve 13. Figure 2 The visible second switch position is in the second operating configuration, and is interconnected and / or separated from each other in a predetermined pattern inside the second main valve 13.

[0057] Fluid transfer is not possible between the separate working joints 27 or 28, but fluid flow of the driving pressure medium is possible between the interconnected working joints 27 or 28.

[0058] In the illustrated embodiment, the first working valve section 25 has a total of four first working connectors 27, and the second working valve section 26 has a total of four second working connectors 28.

[0059] according to Figure 1The view enclosed in a dashed line shows that each main valve 12, 13 has a main valve housing 31 and a movable spool valve 32 relative to it. First and second working joints 27, 28 are constructed at the main valve housing 31. Switching movement 17 is performed by the spool valve 32, which is loaded by a spring device 14. The spool valve 32 has the previously mentioned drive surface 33, which can be loaded with pilot fluid in a controlled manner to induce switching movement 17 via associated pilot valves 15, 16, or can be unloaded in terms of pressure. The first and second working configurations are determined by the design of the spool valve 32. For this purpose, the spool valve has a correspondingly designed working spool valve section 32a, which is the length section of the spool valve 32.

[0060] Two of the first working joints 27 form first connecting working joints 27a, and two of the second working joints 28 form second connecting working joints 28a. The number of first and second connecting working joints 27a and 28a may vary depending on the design of the working valve sections 25 and 26. The first and second connecting working joints 27a and 28a are continuously fluidly connected to each other in an application-specific manner via a working connection channel system 34 belonging to the valve assembly 1. Preferably, each first connecting working joint 27a is in continuous fluid connection with one of the second connecting working joints 28a via its own working connection channel 35 of the working connection channel system 34. Exemplarily, the working connection channel system 34 thus has two independent working connection channels 35 that connect the first and second connecting working joints 27a and 28a in pairs.

[0061] The other two first working connectors 27 are correspondingly output working connectors 27b, wherein each output working connector 27b is connected to one of the two drive chambers 2a, 2b of the fluid-operated actuator 2 via another fluid passage. Other fluid passages are implemented, for example, by means of fluid lines.

[0062] Two additional second working connectors 28 serve as input working connectors 28b, each of which is connected to one of the two control valve outputs 6 via another fluid passage. Here, the additional fluid passage can also be implemented, for example, by means of a fluid line. The number of output working connectors 27b and input working connectors 28b can also vary depending on the desired operating function.

[0063] The first operating valve section 25 is preferably configured such that, in the first switching position of the first main valve 12, the two output operating connectors 27b are separated from and also separated from the first connecting operating connectors 27a (first operating configuration), while in the second switching position of the first main valve 12, the two output operating connectors 27b are respectively connected to one of the two first connecting operating connectors 27a (second operating configuration). The second operating valve section 26 is preferably equipped with similar functions and, for example, is configured such that, in the first switching position of the second main valve 13, the two input operating connectors 28b are separated from and also separated from the two second connecting operating connectors 28a (first operating configuration), while in the second switching position of the second main valve 13, they are respectively connected to one of the two second connecting operating connectors 28a (second operating configuration). Fluid connection and disconnection are caused by changing the position of the operating spool section 32a relative to the main valve housing 31, thereby causing adjustment of the corresponding operating configuration.

[0064] In the first correct operating state or static state, the two main valves 12 and 13 occupy the first switching position, thereby defining the two working valve sections 25 and 26 into a first operating configuration, and the fluid connection between the control valve device 5 and the actuator 2 is doubly interrupted, i.e., interrupted both through the first main valve 12 and through the second main valve 13. In the second correct operating state, the two main valves 12 and 13 occupy the second switching position, thereby defining the two working valve sections 25 and 26 into a second operating configuration, and the fluid connection between the control valve device 5 and the actuator 2 is continuously open. Exemplarily, this results in two open fluid passage branches extending between one of the two control valve outputs 6 and one of the two drive chambers 2a and 2b, respectively.

[0065] The safety function of valve assembly 1 is thus explained as follows: valve assembly 1 interrupts the fluid connection between control valve device 5 and actuator 2 not only in the first correct operating state but also in other operating states, which are referred to below as fault operating states. In these other operating states, the switching positions of the two main valves 12 and 13 are opposite to each other. That is, one of the two main valves 12 and 13 occupies the first switching position, and at the same time, the other of the two main valves 13 and 12 occupies the second switching position.

[0066] Figure 3 and 4 Two examples of this faulty operating state are shown. Based on... Figure 3 In the first fault operation state, the first main valve 12 is in the first switch position, while the second main valve 13 is in the second switch position. Figure 4In the second fault operation state shown, the switch positions are reversed, that is, the first main valve 12 is in the second switch position, while the second main valve 13 is in the first switch position. In both cases, the fluid connection between the control valve device 5 and the fluid-operated actuator 2 is interrupted by one of the two main valves 12 and 13, that is, by the main valve 12 or 13 occupying the first switch position.

[0067] The valve assembly 1 is unique in that each main valve 12, 13, in addition to its working valve sections 25, 26, has an additional valve section called a monitoring valve section. This additional valve section is called the first monitoring valve section in the case of the first main valve 12, and the second monitoring valve section in the case of the second main valve 13. The first monitoring valve section 36 is fluidly separated from the first working valve section 25, just as the second monitoring valve section 37 is fluidly separated from the second working valve section 26.

[0068] The first monitoring valve section 36 has a plurality of first monitoring connectors 38, while the second monitoring valve section 37 has a plurality of second monitoring connectors 39. Preferably, there are three of each of the first and second monitoring connectors 38 and 39, as is the case in the illustrated embodiment. Advantageously, in this case, the two monitoring valve sections 36 and 37 each have a 3 / 2 valve function, as is the case in the illustrated embodiment.

[0069] The first monitoring valve section 36 is configured such that the first monitoring connector 38 is connected to and / or disconnected from each other in the first on / off position of the first main valve 12 in the first monitoring configuration and in the second on / off position of the first main valve 12 in a second monitoring configuration different from the first monitoring configuration. Similarly, the second monitoring valve section 37 is configured such that the second monitoring connector 39 is connected to and / or disconnected from each other in the first on / off position of the second main valve 13 in the first monitoring configuration and in the second on / off position of the second main valve 13 in a second monitoring configuration different from the first monitoring configuration. Importantly, the operating configuration and monitoring configuration always change synchronously when switching each main valve 12, 13.

[0070] The first and second monitoring connectors 38 and 39 are suitably constructed in the main valve housing 31 of the associated main valves 12 and 13. The spool valve 32 is responsible for monitoring configuration changes. In addition to the working spool valve section 32a, the spool valve also has a monitoring spool valve section 32b, which participates in the switching movement 17 and affects the connection mode inside the first and second monitoring connectors 38 and 39 according to the switching position.

[0071] During the switching motion 17 of the spool valve 32, the working spool valve section 32a and the monitoring spool valve section 32b, which are mechanically and forcibly coupled to it, always move synchronously. For example, the mechanical coupling is achieved by integrally connecting the two spool valve sections 32a and 32b to each other. Alternatively, they can also be implemented as separate spool valve sections that are fixed to each other by suitable fastening measures.

[0072] A first exhaust monitoring connector 38a is located below the first monitoring connector 38, and a second exhaust monitoring connector 39a is located below the second monitoring connector 39. Both exhaust monitoring connectors 38a and 39a are permanently connected to a pressure drop section R, preferably atmospheric, so that they can be used for exhaust purposes. The connection to the atmosphere can be achieved by means of a muffler.

[0073] Below the first monitoring connector 38, there are suitably also a first supply monitoring connector 38b and a first connection monitoring connector 38c. In a similar manner, in addition to the second exhaust monitoring connector 39a, the second monitoring connector 39 suitably also includes a second supply monitoring connector 39b and a second connection monitoring connector 39c.

[0074] Two supply monitoring connectors 38b and 39b and two connection monitoring connectors 38c and 39c are connected to the monitoring channel system 42 of the valve assembly 1, which in particular also includes a first pilot channel 19 and a second pilot channel 23.

[0075] Suitably, the second supply monitoring connector 39b of the second monitoring valve section 37 is permanently connected to the first pilot channel 19, preferably via a first branch channel 43 of the monitoring channel system 42, which connects to the first pilot channel 19 at a first branch point 44. The first branch point 44 is located in the first pilot channel 19 between the pilot supply connector 24 and the first pilot connector 18.

[0076] Preferably, the monitoring channel system 42 has a second branch channel 45 that establishes a permanent fluid connection between the first supply monitoring connector 38b and the second pilot channel 23 of the first monitoring valve section 36. The connection between the second branch channel 45 and the second pilot channel 23 occurs at a second branch point 46, which is located between the pilot supply connector 24 and the second pilot connector 22.

[0077] The monitoring channel system 42 suitably also includes a monitoring connection channel 47, which establishes a persistent fluid connection between the first connection monitoring connector 38c of the first main valve 12 and the second connection monitoring connector 39c of the second main valve 13.

[0078] Each main valve 12, 13 is configured such that a first operating configuration always accompanies a first monitoring configuration, and a second operating configuration always accompanies a second monitoring configuration. In other words, the two monitoring valve sections 36, 37 are connected to the associated main valves 12, 13 by... Figure 1 The first monitoring configuration is defined in the visible first switch position, and is configured in the main valves 12 and 13 by... Figure 2 The second monitoring configuration is defined in the visible second switch position.

[0079] Internally, the first and second monitoring valve sections 36 and 37 are configured such that, in the corresponding first monitoring configuration, a fluid connection is established between the corresponding first or second connection monitoring connector 38c and 39c and the first or second exhaust monitoring connector 38a and 39a; and in the second monitoring configuration, a fluid connection is established between the corresponding first or second connection monitoring connector 38c and 39c and the associated first or second supply monitoring connector 38b and 39b. Simultaneously, in the corresponding first monitoring configuration, the first supply monitoring connector 38b and the second supply monitoring connector 39b are separated from other monitoring connectors of the same main valve 12 and 13; and in the second monitoring configuration, each exhaust monitoring connector 38a and 39a is separated from other monitoring connectors 38b, 38c, 39b, and 39c of the same main valve 12 and 13.

[0080] This interconnection enables the first pilot connector 18 and / or the second pilot connector 19 to connect to the first exhaust monitoring connector 38a and / or the second exhaust monitoring connector 39a via the monitoring channel system 42, and thus to be vented if one of the two main valves 12, 13 is in the first switching position, and the other main valve is in its second switching position simultaneously. If both main valves 12, 13 are in either the first or second switching position, each pilot connector 18, 19 is disconnected from the two exhaust monitoring connectors, thereby generating a pilot pressure preset by the pilot pressure source P through the associated pilot channels 19, 23.

[0081] The consequences of this interconnection are as follows: Figure 3 and 4 The error in the running state is obvious.

[0082] Depend on Figure 3 The visible cause of the first faulty operating state is that, from Figure 1Upon initial correct operation, only the second main valve 13 switches to the second switch position, while the first main valve 12 remains in the first switch position. As a result, the first pilot connector 18 connects to the atmosphere via the internal passage section 19a connected to it through the first pilot channel 19 to the first branch point 44, the first branch channel 43, the second monitoring valve section 37 in the second monitoring configuration, the monitoring connection channel 47, and the first monitoring valve section 36 remaining in the second monitoring configuration, and thereby vents air. This prevents the first main valve 12 from subsequently switching to the second switch position.

[0083] according to Figure 4 The second fault operation state occurs because, starting from the first switch position, only the first main valve 12 switches to the second switch position, while the second main valve 13 remains in the first switch position. In this case, the second pilot connector 22 connects to the second exhaust monitoring connector 39a via the internal channel section 23a connected to it through the second pilot channel 23 to the second branch point 46, the second branch channel 45, the first monitoring valve section 36 with the second monitoring configuration, the monitoring connection channel 47, and the second monitoring valve section 37 remaining in the first monitoring configuration, and thereby exhausts gas. Due to the lack of pilot pressure, the second main valve 13 is prevented from subsequently switching to the second switch position.

[0084] Figure 3 and 4 The two fault operation states may be caused by the fact that the two main valves 12 and 13 should have switched back to the first switch position from the second switch position where they were together, but in reality only one of the main valves 12 and 13 switched back.

[0085] For example, a fault can be detected by measuring the running time of the driven component 3 that normally performs the driven motion 4.

[0086] Preferably, each of the two pilot channels 19, 23 has its own fluid reservoir 48 arranged in its direction, the fluid reservoir being... Figure 1 and Figure 2 Under proper operating conditions, a pilot medium under pilot pressure is filled via the associated pilot channels 19, 23. Preferably, a fluid reservoir 48 is arranged in the inner channel section 19a of the first pilot channel 19, and another fluid reservoir 48 is arranged in the inner channel section 23a of the second pilot channel 23. Each fluid reservoir 48 is suitably located adjacent to its associated pilot connector 18, 22.

[0087] Each fluid reservoir 48 is suitably positioned upstream of the pilot pressure source P with a throttling point, referred to as a delayed throttling point 52 for better distinction. Each delayed throttling point 52 is preferably located in one of the two internal channel sections 19a, 23a, particularly between the fluid reservoir 48 and the associated first or second branch points 44, 46.

[0088] Each fluid reservoir 48, particularly in conjunction with the upstream pre-positioned delayed throttling point 52, ensures that the associated first or second pilot joint 18, 22 vents with a time delay if it is connected to one of the vent monitoring joints 38a, 39a due to the different switching positions of the main valves 12, 13. In this way, the system obtains a certain fault tolerance that prevents valve assembly 1 from switching to a faulty operating state if the two main valves 12, 13 switch with a time delay, for example, up to 20 milliseconds, due to tolerance issues, instead of precisely synchronized switching. This fault tolerance ensures that, even with delayed switching of the main valves 12, 13, the pilot pressure at pilot joints 18, 22 remains for a period of time, allowing the two main valves 12, 13 to switch with a small time delay.

[0089] A first input throttle point 53 is suitably arranged in the outer passage section 19b of the first pilot passage 19, which extends between the pilot supply connector 24 and the first branch point 44. A second input throttle point 54 is suitably located in the outer passage section 23b of the second pilot passage 23, which extends between the pilot supply connector 24 and the second branch point 46. The input throttle points 53 and 54 reduce air consumption in an operating condition where one of the inner passage sections 19a and 23a is vented during a fault-prone operation. Similarly, the input throttle points 53 and 54 ensure pilot pressure is provided at both pilot connectors 18 and 22 during fault-free operation.

[0090] Each input throttling point 53, 54 preferably has a greater flow resistance than the channel branch of the monitoring channel system 42, which vents through the first exhaust monitoring connector 38a and / or the second exhaust monitoring connector 39a in fault operation. This ensures that the inflow rate of the pilot medium into the internal channel sections 19a, 23a is less than the outflow rate in the venting state, thereby not impairing the venting function.

[0091] The flow resistance at each delayed throttling point 52 is preferably less than the flow resistance at each input throttling point 53, 54.

[0092] The two main valves 12 and 13 are configured such that when switching between the first and second switching positions, they pass through a system of... Figure 5The visible intermediate position is where both the first monitoring connector 38 and the second monitoring connector 39 are in an intermediate configuration that differs from both the first and second monitoring configurations. In this intermediate configuration, all the first monitoring connectors 38 within the first monitoring valve section 36 and all the second monitoring connectors 39 within the second monitoring valve section 37 are fluidly connected to each other. Therefore, there is a short-circuit connection between all the monitoring connectors 38 and 39 in each monitoring valve section 36, 37. This can also be described as negative overlap when switching between two switching positions. The intermediate position is suitably the center position between the two switching positions of the respective main valves 12, 13.

[0093] The configuration in which the first and second working joints 27, 28 are connected or separated in the intermediate or central position depends on the intended function of the working valve sections 25, 26. Advantageously, however, according to the illustrated embodiment, the working valve sections 25, 26 and monitoring valve sections 36, 37 of each main valve 12, 13 are coordinated to provide a first working configuration of the first and second working joints 27, 28 in the intermediate position.

[0094] The intermediate configuration that occurs during the switching of main valves 12 and 13 is Figures 5 to 9 The other fault operation states shown provide greater security.

[0095] exist Figure 5 The diagram illustrates a third type of fault operation, where the two main valves 12 and 13 move out of the first switch position but remain stopped in an intermediate or central position, respectively. This cessation of movement is related, for example, to pilot medium failure or mechanical blockage. The intermediate configuration of the monitoring valve sections 36 and 37 results in venting from both pilot connectors 18 and 22. Venting from the first pilot connector 18 proceeds via the internal passage section 19a of the first pilot channel 19, the first branch channel 43, and the intermediately configured second monitoring valve section 37 to the second vent monitoring connector 39a. However, even dual venting occurs here because the second connection monitoring connector 39c is connected to the first vent monitoring connector 38a via the monitoring connection channel 47 and the similarly intermediately configured first monitoring valve section 36. The second pilot connector 22 also has dual exhaust, as it is connected to the first exhaust monitoring connector 38a via the second branch channel 45 and the first monitoring valve section 36, and at the same time, the first connection monitoring connector 38c, which is connected to the first supply monitoring connector 38b due to the intermediate configuration, is connected to the second exhaust monitoring connector 39a via the monitoring connection channel 47 and the second monitoring valve section 37.

[0096] Because this removes the pilot pressure from the two pilot valves 15 and 16, the spring device 14 can switch the two main valves 12 and 13 back to their first switching positions, thereby generating a pressure drop caused by the pressure drop. Figure 1 A visible, safe, and static state.

[0097] Figure 6 The diagram illustrates a fourth fault operation state, in which, when the two main valves 12 and 13 switch from the first switch position, only the second main valve 13 correctly switches to the second switch position, while the first main valve 12 remains stuck in the intermediate position. In this case, the second pilot connector 22 connects to the first exhaust monitoring connector 38a via the internal passage section 23a of the second pilot channel 23, the second branch channel 45, and the first monitoring valve section 36 defining the intermediate configuration, and thereby exhausts gas. As a result, the second main valve 13 immediately switches back to the first switch position by the spring force of the associated spring device 14, thereby interrupting the fluid connection between the second operating valve section 26 and the control valve device 5 and the actuator 2.

[0098] Figure 7 The fifth fault operating state shown is related to Figure 6 The fourth fault operation state shown is similar, the only difference being that here the first main valve 12 has been correctly switched to the second switch position, while the second main valve 13 is stuck in the intermediate or central position when switched to the second switch position. In this case, the first pilot connector 18 is connected to the second exhaust monitoring connector 39a via the internal channel section 19a of the first pilot channel 19, the first branch channel 43, and the second monitoring valve section 37 defining the intermediate configuration, and exhausts gas therefrom. This causes the first main valve 12 to immediately switch back to the first switch position due to the spring force of the associated spring device 14, thereby presetting the second operating configuration of the first working valve section 25, and interrupting the fluid connection between the control valve device 5 and the actuator 2.

[0099] Figure 8The diagram illustrates a sixth fault operating state that occurs when main valves 12 and 13 switch back from their common second switching position. The switch back to the first switching position is caused by control device 7 deactivating both pilot valves 15 and 16, thereby venting air. Therefore, spring device 14 has a push-back action in both main valves 12 and 13. However, due to the fault, only the second main valve 13 is switched back to the first switching position, while the first main valve 12 is stuck in the intermediate or center position. In this situation, the fluid connection between control valve device 5 and actuator 2 is interrupted due to the first working configuration of the second working valve section 26. This operating state is ensured by the fact that the second main valve 13 cannot switch back to the second switching position even if the second pilot valve 16 is activated, in which the fluid connection between control valve device 5 and actuator 2 is opened. This switching is prevented by the fact that the second pilot connector 22 is connected to the first exhaust monitoring connector 38a via the first monitoring valve section 36, which is positioned between the internal channel section 23a of the second pilot channel 23, the second branch channel 45, and the first main valve 12, and is therefore pressureless.

[0100] Figure 9 The seventh fault operating state is shown, which is related to... Figure 8 The sixth fault operating state differs in that, starting from the respective occupied second switch positions, only the first main valve 12 switches back to the first switch position as specified, while the second main valve 13 is stuck in the intermediate or center position. In this case, the first pilot connector 18 is connected to the second exhaust monitoring connector 39a via the internal passage section 19a of the first pilot channel 19, the first branch channel 43, and the preset intermediate configuration of the second monitoring valve section 37, and is therefore pressureless. Therefore, even if the associated first pilot valve 15 is activated, the first main valve 12 cannot switch back to the second switch position due to insufficient pilot pressure. The fluid connection between the control valve device 5 and the actuator 2 is thus interrupted by the first operating valve section 25, which is preset to the first operating configuration.

Claims

1. A valve assembly, - Equipped with a first valve unit (8), the first valve unit having a monostable first main valve (12) prestressed to a first switching position by a spring force by a spring device (14), and the first valve unit having an electrically operable first pilot valve (15), through which the first main valve (12) can be switched to a second switching position by means of pilot pressure overcoming the spring force and can be held in the second switching position, wherein, The pilot pressure is provided by a pilot fluid, which originates from a pilot pressure source (P), which is connected to the first pilot connector (18) of the first pilot valve (15) via a first pilot passage (19) during the operation of the valve assembly (1). - Equipped with a second valve unit (9), the second valve unit having a monostable second main valve (13) prestressed to a first switching position by a spring force by a spring device (14) and the second valve unit having an electrically operable second pilot valve (16), through which the second main valve (13) can be switched to a second switching position by means of pilot pressure overcoming the spring force and can be held in the second switching position, wherein the pilot pressure is provided by a pilot fluid originating from a pilot pressure source (P), which is connected to a second pilot connector (22) of the second pilot valve (16) via a second pilot channel (23) during operation of the valve assembly (1). - In this configuration, the first main valve (12) has a first working valve section (25) having a plurality of first working connectors (27) which are interconnected and / or separated from each other within the first main valve (12) in a first working configuration at a first switching position and in a second working configuration at a second switching position. The second main valve (13) has a second working valve section (26) having a plurality of second working connectors (28) which are interconnected and / or separated from each other within the second main valve (13) in a first working configuration at a first switching position and in a second working configuration at a second switching position. At least one of the first working connectors (27) and at least one of the second working connectors (28) are configured as connecting working connectors (27a, 28a), which are permanently interconnected via a working connection channel system (34). -And at least one of the first or second working joints (27, 28) is an output working joint (27b) suitable for connecting to a fluid-operated actuator (2), Its features are, - The first main valve (12) has a first monitoring valve section (36) fluidly separated from the first working valve section (25). The first monitoring valve section has a plurality of first monitoring connectors (38). These first monitoring connectors are always in a first monitoring configuration in a first switching position of the first main valve (12) and are always in a second monitoring configuration different from the first monitoring configuration in a second switching position of the first main valve (12). - The second main valve (13) has a second monitoring valve section (37) fluidly separated from the second working valve section (26). The second monitoring valve section has a plurality of second monitoring connectors (39). These second monitoring connectors are connected to and / or separated from each other in the first monitoring configuration when the second main valve (13) is in the first switching position and in a second monitoring configuration different from the first monitoring configuration when the second main valve (13) is in the second switching position. - In this configuration, one of the first monitoring connectors (38) of the first monitoring valve section (36) is implemented as a first exhaust monitoring connector (38a) communicating with the pressure drop section (R), and one of the second monitoring connectors (39) of the second monitoring valve section (37) is implemented as a second exhaust monitoring connector (39a) communicating with the pressure drop section (R). Each additional first monitoring connector (38) and each additional second monitoring connector (39) is connected to a monitoring channel system (43), which includes both the first pilot channel (19) and the second pilot channel (23). -In particular, the first pilot connector (18) and / or the second pilot connector (22) are connected to the first exhaust monitoring connector (38a) and / or the second exhaust monitoring connector (39a) via the monitoring channel system (42), and exhaust is performed if one of the two main valves (12, 13) occupies its first switch position, and at the same time the other of the two main valves (13, 12) occupies its second switch position.

2. The valve assembly according to claim 1, characterized in that, A fluid reservoir (48) is arranged in both the first pilot channel (19) and the second pilot channel (23) before the respective associated pilot connectors (18, 22).

3. The valve assembly according to claim 2, characterized in that, In both the first pilot channel (19) and the second pilot channel (23), a delayed throttling point (52) is arranged on the side of the fluid reservoir (48) opposite to the associated pilot connectors (18, 22), the delayed throttling point causing a delayed fluid outflow when the pilot connectors (18, 22) are vented.

4. The valve assembly according to any one of claims 1 to 3, characterized in that, The two monitoring valve sections (36, 37) each have a 3 / 2 valve function.

5. The valve assembly according to claim 4, characterized in that, The two monitoring valve sections (36, 37) each have three first or second monitoring connectors (38, 39). The first monitoring valve section (36) includes a first supply monitoring connector (38b) and a first connection monitoring connector (38c) in addition to the first exhaust monitoring connector (38a). The second monitoring valve section (37) includes a second supply monitoring connector (39b) and a second connection monitoring connector (39c) in addition to the second exhaust monitoring connector (39a). The first supply monitoring connector (38b) is connected to the second pilot channel (23), and the second supply monitoring connector (39b) is connected to the first pilot channel (19). The first connection monitoring connector (38c) is connected to the second connection monitoring connector (39c) via the monitoring connection channel (47) of the monitoring channel system (42).

6. The valve assembly according to claim 5, characterized in that, The first monitoring valve section (36) and the second monitoring valve section (37) are configured such that the first monitoring valve section (36) belonging to the first main valve (12) establishes a fluid connection between the first connection monitoring connector (38c) and the first exhaust monitoring connector (38a) in the first monitoring configuration, and establishes a fluid connection between the first connection monitoring connector (38c) and the first supply monitoring connector (38b) in the second monitoring configuration, wherein the second monitoring valve section (37) belonging to the second main valve (13) establishes a fluid connection between the second connection monitoring connector (39c) and the second exhaust monitoring connector (39a) in the first monitoring configuration, and establishes a fluid connection between the second connection monitoring connector (39c) and the second supply monitoring connector (39b) in the second monitoring configuration.

7. The valve assembly according to claim 5 or 6, characterized in that, The second supply monitoring connector (39b) is connected to the first pilot channel (19) at the first branch point (44) via the first branch channel (43) of the monitoring channel system (42), wherein the first supply monitoring connector (38b) is connected to the second pilot channel (23) at the second branch point (46) via the second branch channel (45) of the monitoring channel system (42), wherein.

8. The valve assembly according to claim 7, characterized in that, The monitoring channel system (42) has a pilot supply connector (24) that is connected to the pilot pressure source (P) during the operation of the valve assembly (1). The first pilot channel (19) and the second pilot channel (23) are connected to the pilot supply connector. In the first pilot channel (19), a first input throttling point (53) is arranged between the pilot pressure source (P) and the first branch point (44). In the second pilot channel (23), a second input throttling point (54) is arranged between the pilot pressure source (P) and the second branch point (46).

9. The valve assembly according to claim 8, characterized in that, Each input throttling point (53, 54) has a greater flow resistance than the channel branch, which exhausts via a first exhaust monitoring connector (38a) and / or a second exhaust monitoring connector (39a), and the channel branch includes branch channels (43, 45) connected to the associated branch points (44, 46).

10. The valve assembly according to claim 8 or 9 in conjunction with claim 3, characterized in that, The flow resistance at the delayed throttling point (52) is less than the flow resistance at the input throttling points (53, 54).

11. The valve assembly according to any one of claims 1 to 10, characterized in that, The first main valve (12) passes through an intermediate position during switching between the first switch position and the second switch position, wherein the first monitoring connector (38) occupies an intermediate position different from the first monitoring configuration and the second monitoring configuration, wherein all the first monitoring connectors (38) inside the first monitoring valve section (36) are fluidly connected to each other.

12. The valve assembly according to any one of claims 1 to 11, characterized in that, The second main valve (13) passes through an intermediate position during switching between the first switch position and the second switch position, in which the second monitoring connector (39) occupies an intermediate configuration different from the first monitoring configuration and the second monitoring configuration, in which all the second monitoring connectors (39) inside the second monitoring valve section (37) are fluidly connected to each other.

13. The valve assembly according to claim 11 or 12, characterized in that, The working valve sections (25, 26) and monitoring valve sections (36, 37) of the main valves (12, 13) are coordinated with each other such that the first working configuration of the working connectors (27, 28) is present in the intermediate position.

14. The valve assembly according to any one of claims 1 to 13, characterized in that, Each main valve (12, 13) has a slide valve (32) that can only move synchronously and uniformly relative to the main valve housing (31), through which both the working configuration and the monitoring configuration can be preset simultaneously.

15. The valve assembly according to claim 14, characterized in that, Each spool valve (32) has a working spool valve section (32a) belonging to the working valve section (25, 26) and used for presetting the working configuration, and a monitoring spool valve section (32b) belonging to the monitoring valve section (36, 37) and used for presetting the monitoring configuration.

16. The valve assembly according to any one of claims 1 to 15, characterized in that, The first working valve section (25) belonging to the first main valve (12) has one or more first working connectors (27), which are configured to connect to the output working connector (27b) of the fluid-operated actuator (2), while the second working valve section (26) belonging to the second main valve (13) has one or more second working connectors (28), which are configured to connect to the input working connector (28b) of the control valve device (5) for controlling the operation of the actuator (2).

17. The valve assembly according to claim 16, characterized in that, The first working valve section (25) has four first working connectors (27), and the second working valve section (26) has four second working connectors (28). Two of the first working connectors (27) are configured as two output working connectors (27b), and two of the second working connectors (28) are configured as two input working connectors (28b). The other two first working connectors (27) are configured as two first connecting working connectors (27a), and the other two second working connectors (28) are configured as two second connecting working connectors (28a). Each first connecting working connector (27a) is connected via the working connection channel system (34) itself. The working connection channel (35) is connected to one of the two second connecting working connectors (28a), wherein the two output working connectors (27b) are connected to one of the two first connecting working connectors (27b) respectively in the second switch position of the first main valve (12), and are separated from the two first connecting working connectors (27a) in the first switch position of the first main valve (12), and wherein the two input working connectors (28b) are connected to one of the two second connecting working connectors (28a) respectively in the second switch position of the second main valve (13), and are separated from the two second connecting working connectors (28a) in the first switch position of the first main valve (12).

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