Actuating device for adjusting a fluid flow in a process engineering system
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-11-13
- Publication Date
- 2026-08-13
Smart Images
Figure EP2025082923_13082026_PF_FP_ABST
Abstract
Description
[0001] Actuating device for adjusting fluid flow in
[0002] a process engineering plant
[0003] The present invention relates to an adjusting device for adjusting a fluid flow in process engineering plants, comprising a valve rod and an actuating element connected thereto.
[0004] Actuators are commonly used in control valves in industrial processes, such as the chemical and petrochemical industries, but also the food and pharmaceutical industries, where reliable control and / or regulation of the flow of process fluids through a control valve is required.
[0005] One of the challenges in designing such an actuator is to create a connection between the valve stem and the actuator that is both stable and easy to assemble, while minimizing the risk of malfunctions such as twisting or loosening of the connection.
[0006] In the prior art, the connection between a valve stem and valve cone is often achieved by a simple threaded connection, as described, for example, in WO 2009 / 076068 Al. Here, the connection is made by means of a nut that holds the valve stem and the valve cone together. However, this design has disadvantages, as it can lead to unintentional loosening of the connection under operating conditions, especially during vibrations or temperature fluctuations. Furthermore, such designs often require additional lifting equipment when installing heavy valves, which makes the installation process more complex.
[0007] An alternative solution, as described, for example, in EP 3224510, provides a detent connection in which a detent element designed as an open ring is used to create a positive-locking connection between a valve stem and a throttle body of a corresponding valve assembly. DE 102017 123 308 B4 discloses a control valve with a valve piston connected to a valve stem. A separate flange is attached to the valve stem to connect it to the valve piston, and this flange is screwed to the valve piston via several threaded connecting elements. The flange and the valve stem are connected to each other via a threaded connection.To secure the threaded connection between the flange and the valve stem, a toothed section with external teeth on the valve stem, a separate toothed ring section with internal teeth matching the external teeth, and a locking pin on the flange are provided. During assembly, the locking pin engages a recess on the toothed ring section below its locking mechanism, with the external teeth of the valve stem toothed section engaging the internal teeth of the toothed ring section when the control valve is installed.
[0008] The object of the invention is to provide a connection between a valve stem and an actuator that is simplified compared to the prior art and at the same time reliable, which enables a compact design and is easy to assemble.
[0009] The present invention solves this problem by means of an adjusting device with the features according to claim 1.
[0010] According to the invention, an adjusting device for regulating fluid flow in a process plant comprises an actuating element connected to a valve stem, the actuating element being formed integrally with the valve stem at least in a connection area, wherein the valve stem is connected to the actuating element via a screw connection, and wherein the valve stem is held against movement relative to the actuating element by means of a locking pin. A receiving area for at least partial reception of the locking pin is formed on the outer surface of the valve stem, wherein the actuating element is designed with a through-hole for receiving the locking pin when arranged on the valve stem, and wherein the locking pin is arranged in a position engaging the valve stem via the receiving area essentially perpendicular to the central axis of the valve stem.The design according to the invention, through the use of the locking pin, forms a connection between the valve stem and the actuator that is particularly resistant to rotation during operation. This locking mechanism prevents unwanted relative movement between the valve stem and the actuator, thus ensuring the reliable function of the actuator even under extreme operating conditions such as high pressures or strong temperature fluctuations. Overall, the locking pin's fixation of the valve stem and the actuator contributes to the stability of the entire actuator.
[0011] Furthermore, the arrangement of the locking pin helps to reduce the susceptibility to errors during the assembly process. The locking pin's position, determined by the receiving area in the assembled state, ensures a precise alignment of the components, namely the valve stem and the actuator, relative to each other. Subsequent or additional alignment or correction during assembly is unnecessary, thus increasing the risk of misalignment and improving assembly accuracy.
[0012] The locking pin is designed to fix and secure the actuator relative to the valve stem in the desired position. Specifically, the locking pin is designed to create a positive-locking connection between the components. Such a connection is achieved when the geometries of the locking pin and the corresponding receptacle in the components are so precisely matched that they lock into place without any additional force or friction. A simple example of a positive-locking connection would be a cylindrical locking pin that, by fitting precisely into a corresponding bore, prevents any movement of the valve stem and actuator relative to each other. This positive-locking connection ensures that the components are reliably held in the desired position without requiring any additional friction or deformation.This ensures a stable and durable connection that functions reliably under normal operating conditions. Its use prevents the valve stem and actuator from shifting, twisting, or unintentionally separating from each other.
[0013] The locking pin's perpendicular orientation to the central axis ensures that forces are distributed evenly along its length. This guarantees an optimal connection between the valve stem and the actuator, preventing point loads. A further advantage of this orientation is that the precise locking action of the pin reliably prevents relative movement between the components. This not only contributes to increased stability but also extends the service life of the entire device.
[0014] The actuator of the control device can be implemented in various designs to precisely control the fluid flow in a process plant. In a first embodiment, the actuator is designed as a valve cone that interacts with a seat, in particular a conical seat. The geometric fit between the valve cone and the seat enables precise control of the fluid flow. In an alternative embodiment, the actuator can be designed as a valve piston that regulates the fluid flow through its movement within the control device. The valve piston can, for example, interact directly with a seat by sealing or releasing it to generate the desired flow rate. Regardless of the specific design, the actuator is connected to the valve stem via the screw connection and positively locked in place by the locking pin.This connection ensures stable and reliable operation of the actuator, regardless of whether the actuator is designed as a valve cone or a valve piston.
[0015] The through-hole in the actuator refers to the opening that at least partially passes through the actuator. It is advantageously designed with open ends on both sides. The through-hole interacts with the receiving area of the valve stem, thus forming a complete receptacle for the locking pin. In other words, the receiving area for the locking pin is aligned with the through-hole in the actuator when the valve stem is screwed into the actuator. The diameter and orientation of the through-hole are selected such that, upon insertion of the locking pin, a positive-locking connection is established between the valve stem and the actuator, ensuring the desired rotationally secure positioning of the components relative to each other.The receiving area for the locking pin can be implemented in various designs, depending on the requirements for the connection and assembly. In one possible configuration, the receiving area is formed as a single recess, utilizing only a portion of the valve stem's outer circumference. In this case, the locking pin would be positioned at a predefined location.
[0016] Alternatively, the receiving area can be formed by several individual receptacles arranged perpendicular to the central axis of the valve stem, thus providing multiple predefined positions for the locking pin. Depending on the orientation or position of the valve stem within the actuator, the locking pin can be received in at least one of the provided individual receptacles. The individual receptacles are preferably spaced evenly apart and arranged perpendicular to the central axis. Furthermore, the individual receptacles can be positioned relative to each other in such a way that the locking pin is received in several receptacles simultaneously. This can, for example, allow for a more stable fixation or more flexible handling during assembly.
[0017] Another option is to design a circumferential receiving area, allowing the locking pin to be positioned at any point around the circumference of the valve stem. This enables quick and easy assembly while simultaneously ensuring the desired rotation-free positioning of the valve stem and actuator relative to each other.
[0018] In particular, the receiving area is designed to extend around the entire valve stem. This design allows the locking pin to be positioned at any point along the valve stem. This results in particularly flexible handling during assembly and use of the device, without requiring specific orientation guidelines for the valve stem.
[0019] Advantageously, at least one receiving area on the outer surface of the valve stem is designed perpendicular to the central axis of the valve stem. The perpendicular orientation of the receiving area ensures mechanically optimal fixation of the locking pin, as the forces acting axially on the valve stem are not directly transmitted to the locking pin. This minimizes wear and increases operational reliability. Furthermore, the perpendicular orientation facilitates assembly. The through-hole is also advantageously designed perpendicular to the central axis of the valve stem. The through-hole and the receiving area together form the overall receptacle or guide for the locking pin.
[0020] In a further advantageous embodiment of the invention, the at least one receiving area is formed essentially uniformly around the central axis of the valve stem. This uniform design ensures a symmetrical force transmission between the connected components, i.e., the valve stem and the actuator, and thus reduces asymmetrical loads or local overloading.
[0021] The preferred design is at least one receiving area formed as an annular groove encircling the outer circumference of the valve stem. This annular groove provides a universal receptacle for the locking pin and allows for quick and easy installation at any position around the circumference of the valve stem within the groove. The continuous annular groove also ensures uniform force distribution along the entire circumference of the valve stem, reducing material stress and wear. The circumferential design significantly simplifies assembly, as the orientation of the valve stem is irrelevant during assembly of the actuator, which is a considerable advantage, especially in more complex or difficult-to-access designs.
[0022] Preferably, the locking pin is arranged in the through-hole of the actuator, wherein the through-hole is at least partially open towards the outer surface of the valve stem in the region of the actuator's inner circumference. Functionally, the opening of the through-hole towards the valve stem ensures precise positioning of the locking pin in the corresponding receiving area, thereby guaranteeing a positive-locking connection between the actuator and the valve stem. This increases the mechanical stability of the connection and minimizes the risk of movement or loosening under dynamic loads. Advantageously, the outer surface of the locking pin, when installed, is in at least partial contact with the inner surface of the receiving area.This surface contact, preferably gap-free at least in sections, ensures an even distribution of the forces transmitted by the locking pin to the valve stem. This increases the stability of the connection and effectively prevents material fatigue or damage caused by point loads.
[0023] Preferably, the valve stem has an external thread in a first section, via which the valve stem is fastened to the actuator. More preferably, the actuator is designed with a cylindrical axial bore that has an internal thread in at least a first section. During assembly of the actuator, the external thread of the valve stem is screwed into the internal thread formed in the first section of the actuator, creating a stable screw connection. The screw or threaded connection ensures high tensile strength and prevents the components from loosening from each other during operation.
[0024] In a further embodiment, the cylindrical axial bore features, in at least a second section, a locating bore with a diameter larger than that of the internal thread. This locating bore serves for the precise alignment of the valve stem within the actuator. When in contact with the corresponding mating surface of the valve stem, the locating bore ensures its proper guidance, centering, and alignment. The increased diameter of the locating bore provides precise guidance and alignment, minimizing tilting movement of the valve stem. This reduces the risk of play and wear. The combination of the internal thread for securing the valve stem and the locating bore for its guidance ensures optimal functionality and even load distribution, significantly improving the service life and operational reliability of the actuator.The distance of the fitting bore from the central axis of the valve stem is matched to the geometry of the valve stem.
[0025] In a preferred embodiment of the invention, the through-hole for receiving the locking pin is formed in the area of the locating bore. This design offers the advantage that the through-hole is located in an area that ensures a precise and stable connection between the valve stem and the valve cone. This minimizes the risk of misalignment or loosening of the pin during operation and ensures long-term functionality of the actuator.
[0026] In a further advantageous embodiment, the valve stem has a shoulder to limit its insertion depth, which rests against a boundary surface of the actuator. The shoulder ensures that the valve stem reaches a precise and defined insertion depth when screwed into the actuator, but does not exceed it. This prevents overloading of the connection or impairment of the actuator's functionality. Furthermore, the shoulder provides a reliable and stable contact surface between the valve stem and the actuator, increasing the strength and durability of the connection. The shoulder thus contributes to improved assembly accuracy and mechanical stability, minimizing the likelihood of malfunctions during operation.
[0027] Overall, the receiving area for the locking pin is aligned so that it is aligned with the through-hole in the actuator when the valve stem is screwed into the actuator and the shoulder rests against the boundary surface of the actuator.
[0028] The through-hole preferably has at least two sections with different diameters. The diameter is larger on the entry side, i.e., the side where the locking pin is inserted during assembly of the actuator, compared to the exit side. The reduced diameter on the exit side of the through-hole acts as a mechanical barrier, preventing the locking pin from being pushed out during insertion and ensuring that it remains in its intended position. Furthermore, this offers the advantage that the locking pin can be removed from the through-hole in the opposite direction to its insertion if necessary, for example, during maintenance or component replacement. The valve stem is preferably reusable. D1606 / WQ
[0029] In an advantageous embodiment of the invention, the penetration depth of the locking pin into the through-hole is limited by the geometry of a flat surface formed on one side of the through-hole. This flat surface ensures that the locking pin can penetrate the through-hole precisely and in a controlled manner without exceeding the specified tolerances. Limiting the penetration depth with a flat surface prevents the locking pin from penetrating too deeply into the hole, thus avoiding potential damage to the component or incorrect positioning of the pin. This precise control of the penetration depth improves the quality of the connection between the locking pin and the valve stem, thereby contributing to increased stability and safety of the entire actuator.Furthermore, the geometry of the planar surface ensures reproducible and consistently high manufacturing accuracy, leading to better process control and a longer service life of the device.
[0030] In principle, locking pins can have various designs. For example, their cross-section can be cylindrical, conical, or oval. Similarly, their surface can be smooth, roughened, or feature structural elements such as notches, grooves, or serrations to adapt the fixing to specific requirements. Locking pins can be made from different materials, such as metal, plastic, or composite materials, to ensure the desired properties in terms of strength, corrosion resistance, or thermal stability. They can be installed by pressing, hammering, or other mechanical methods.
[0031] Preferably, the locking pin is unthreaded. A threadless locking pin can be more easily inserted into pre-drilled holes and requires less precise tolerances, thus reducing production costs. Furthermore, a threadless design allows for simple and quick assembly, as no screw connections are required. Assembly can be achieved, for example, by pressing, hammering, or other mechanical methods. Moreover, the absence of threads avoids local stresses and distributes the mechanical load evenly. Particularly preferred is the locking pin designed as a grooved pin that deforms when positioned in the through-hole. This deformation ensures increased holding force through frictional engagement and enables a secure connection without the need for additional locking elements.Such a grooved pin adapts to manufacturing tolerances and can therefore be used in bores of varying sizes. This increases application flexibility and reduces the need for precise component tolerances.
[0032] At the same time, the targeted deformation allows for vibration-resistant fixing, as the grooved pin conforms to the contours of the bore and thus effectively prevents movement. Additionally, pressing in the grooved pin creates a supporting frictional connection, which further increases the stability of the joint. The combination of form and frictional locking ensures not only high load-bearing capacity but also easy installation, as the grooved pin can be used without complex screws or additional fasteners.
[0033] Exemplary embodiments and alternative solutions of the invention are explained in more detail below with reference to a drawing. These exemplary embodiments contain numerous features in combination. A person skilled in the art will also find it advantageous to consider the features individually and combine them into meaningful further combinations. Identical or functionally similar components depicted in different figures bear the same reference numerals to maintain clarity and avoid repetition. A person skilled in the art will easily understand this assignment and will recognize that these components, regardless of their specific representation in the individual figures, fulfill the same functions.
[0034] This shows:
[0035] Fig. 1 shows an adjusting device in a three-dimensional representation,
[0036] Fig. 2 shows the adjusting device according to Fig. 1 in a sectional view, as well as
[0037] Fig. 3 shows a section of the actuator according to Figs. 1 and 2 in a three-dimensional view. Fig. 1 shows an actuator 1 for adjusting a fluid flow in a process plant with an actuator 5, in this case designed as a valve piston 3, and a valve rod 7 in a three-dimensional view. The actuator 5 is formed in one piece, at least in the connection area 8 for attachment to the valve rod 7.
[0038] To fix components 5 and 7 to one another, a locking pin 9 is inserted in the connection area 8. When the actuator 1 is assembled, this locking pin is received in a multi-stage through-bore 13 formed in the wall 11 of the valve piston 3. The connection of the actuator 5 to the valve stem 7 and its corresponding fixation are described in detail below in Figures 2 and 3.
[0039] Fig. 2 shows the actuator 1 according to Fig. 1 in a sectional view. The connection between the valve stem 7 and the valve piston 3 is clearly visible in this view. The valve piston 3 has a cylindrical axial bore 15 with two sections 19 and 21 extending along the central axis 17 of the valve stem 7. In the first section 19, the cylindrical axial bore 15 has an internal thread 23 which engages a corresponding external thread 27 formed on the outer circumference 25 of the valve stem 7. The connection in the first section 19 is therefore a screw connection, which ensures a stable arrangement of the valve stem 7 and the actuator 5. The screw connection provides high tensile strength and prevents the components 5 and 7 from loosening from each other during operation of the actuator 1.
[0040] In the second section 21, the cylindrical axial bore 15 is formed with a fitting bore 29 that has a larger diameter than the internal thread 23. The larger diameter of the fitting bore 29, compared to the first section 19, ensures the precise alignment and concentricity of the valve stem 7. The increased diameter of the fitting bore 21 provides precise guidance and a backlash-free fit, thus minimizing tilting movement of the valve stem 7 in the assembled state.
[0041] In the area of this second section 21, i.e. in the area of the enlarged bore 29, the locking pin 9 is inserted to additionally secure the valve rod 7 and the valve piston 3, forming a positive locking connection between the valve rod 7 and the valve piston 3.
[0042] To position the locking pin 9, the valve stem 7 includes a receiving area 33 on its outer surface 31, which, together with the through-bore 13 formed in the wall 11 of the valve piston 3, forms a complete receptacle 35 for the locking pin 9. The receiving area 33 is designed as an annular groove 37 circumferentially around the valve stem 7, extending uniformly around the central axis 17 of the valve stem 7. In this way, it provides a universal receptacle for the locking pin 9 and allows for quick and easy assembly regardless of the orientation of the valve stem 7.
[0043] The through-hole 13 has open ends 39, 41 on both sides, although only one open end 39 is visible in the illustration. It interacts with the receiving area 33 of the valve stem 7, thus forming the overall receiving area 35. For this purpose, the through-hole 13 is open in the area of the inner circumference 43 of the actuator 5, towards the outer surface 31 of the valve stem 7, so that a positive-locking connection between the actuator 5 and the valve stem 7 is ensured.
[0044] The locking pin 9, which is positively engaged in the circumferential annular groove 37 of the valve stem 7, is designed here as a threadless, deformable grooved pin 45 and engages in the annular groove 37 perpendicular to the central axis 17 of the valve stem 7. When inserted into the through-bore 13 of the actuator 5 and the receiving area 33 of the valve stem 7, the grooved pin 45 deforms elastically, resulting in surface contact between the outer surface 31 of the valve stem 7, the inner surface 47 of the annular groove 37, and the outer surface 49 of the grooved pin 45, which rests against both surfaces 31 and 47.
[0045] Overall, this arrangement enables a secure and stable connection between the actuator 5 and the valve stem 7, which withstands high mechanical loads and offers ease of assembly. To limit the insertion depth of the valve stem 7 into the cylindrical axial bore 9, the valve stem 7 has a shoulder 51 that abuts a boundary surface 53 of the valve piston 3. The shoulder 51 ensures that the valve stem 7 achieves the desired defined insertion depth when screwed into the valve piston 3. This ensures, in particular, that the annular groove 37 and the through-bore 13 are positioned relative to each other in such a way that the locking pin 9 can be easily and correctly inserted into the overall receptacle 35 formed by them.
[0046] Fig. 3 shows a section of the actuator 5 of the actuator 1, designed as a valve piston 3 according to Figs. 1 and 2. The through-bore 13 formed in the wall 11 of the valve piston 3 is shown in section. The through-bore 13 extends within the wall 11 of the valve piston 3 perpendicular to the direction of extension of the central axis 17 of the valve rod 7 (not shown) and, together with the receiving area 33 designed as an annular groove 37 (not shown), forms the overall receiving area 35 (not shown) or the overall guide for the locking pin 9. For this purpose, the through-bore 13 is open towards the outer surface 31 of the valve rod 7 in the region of the inner circumference 43 of the actuator 5.
[0047] The through-bore 13, in the area of the fitting bore 29 of the valve piston 3, is formed with two sections 55, 57 of different diameters, which are optimized for positioning and mounting the locking pin 9 (not shown). At the inlet side 59, i.e., at the first open end 39 of the through-bore 13, from where the locking pin 9 is inserted, the diameter is larger than at the outlet side 61. The reduced diameter at the outlet side 61 of the through-bore 13, i.e., at the second open end 41 of the through-bore 13, acts as a mechanical barrier that prevents the locking pin 9 from being pushed out during insertion and ensures that it remains in its intended position.
[0048] Due to the design of the bore as a through bore 13 with open ends 39, 41 on both sides, it is ensured that the locking pin 9 can be removed from the through bore 13 in the opposite direction of insertion if necessary, for example in the case of maintenance or replacement of components.
[0049] The penetration depth of the locking pin 9 into the through-hole 13 is limited by the geometry of the flat surface 63 formed on the entry side 59 of the through-hole 31. The flat surface 63 thus ensures that the locking pin 9 can be inserted precisely and in a controlled manner into the through-hole 23 using a suitable tool, without exceeding the specified tolerances.
[0050] The features and functions shown in Figures 1 to 3 generally relate to the specific embodiment of each figure. However, it is obvious to a person skilled in the art that these features and functions can also be considered independently and used in different combinations. A person skilled in the art will be able to extract individual features or functions from the illustrated embodiments and combine them with other described or obvious technical features without altering the essence of the invention. [List of reference symbols]
[0051] Actuator
[0052] Valve piston
[0053] actuator
[0054] Valve stem
[0055] Connection area
[0056] Safety pin
[0057] wall
[0058] through hole
[0059] cylindrical axial bore
[0060] central axis
[0061] first section valve stem
[0062] second section valve stem
[0063] Internal thread of the cylindrical axial bore; outer circumference of the valve rod; external thread of the valve rod
[0064] Fitting bore
[0065] outer surface of the valve stem receiving area
[0066] Complete recording
[0067] Ring groove
[0068] open ending
[0069] open ending
[0070] Inner circumference of the actuator
[0071] Carved pin
[0072] Inner surface of the ring groove
[0073] outer surface of the locking pin, shoulder of the valve stem
[0074] Boundary surface
[0075] first section of the through-hole second section of the through-hole 59 Inlet side of the through-hole 61 Outlet side of the through-hole 63 Flat surface
Claims
Patent claims 1. Actuating device (1) for adjusting a fluid flow in a process plant, comprising an actuating element (5) connected to a valve rod (7), the actuating element being formed integrally at least in a connection area (8) for connection to the valve rod (7), wherein the valve rod (7) is connected to the actuating element (5) via a screw connection, and wherein the valve rod (7) is held against movement relative to the actuating element (5) by means of a locking pin (9), characterized by the fact that a receiving area (33) for at least partial reception of the locking pin (9) is formed on the outer surface (31) of the valve rod (7), wherein the actuating element (5) is formed with a through-hole (13) for receiving the locking pin (9) when arranged on the valve rod (7), and wherein the locking pin (9) is arranged in a position engaging the valve rod (7) in a form-fitting manner via the receiving area (33) essentially perpendicular to the central axis (17) of the valve rod (7).
2. Actuating device (1) according to claim 1, characterized by the fact that which at least one receiving area (33) is formed perpendicular to the central axis (17) of the valve rod (7).
3. Actuating device (1) according to claim 1 or 2, characterized by the fact that which at least one receiving area (33) is formed essentially uniformly around the central axis (17) of the valve rod (7).
4. Actuating device (1) according to one of the preceding claims, characterized by the fact that 5. Actuating device (1) according to one of the preceding claims, characterized by the fact that the locking pin (9) is arranged in the through-hole (13) of the actuator (5), wherein the through-hole (13) in the area of the inner circumference (43) of the actuator (5) is at least partially open to the outer surface (31) of the valve stem (7).
6. Actuating device (1) according to one of the preceding claims, characterized by the fact that the outer surface (49) of the locking pin (9) in the installed state is at least partially in contact with the inner surface (47) of the receiving area (33).
7. Actuating device (1) according to one of the preceding claims, characterized by the fact that the actuating element (5) is designed with a cylindrical axial bore (9) which has an internal thread (23) at least in a first section (19) into which an external thread (27) formed on the outer circumference (25) of the valve rod (7) engages.
8. Actuating device (1) according to claim 7, characterized by the fact that the cylindrical axial bore (9) has in at least a second section (21) a fitting bore (29) which has an enlarged diameter compared to the internal thread (23) of the cylindrical axial bore (9) for aligning the valve rod (7) in the actuator (5).
9. Actuating device (1) according to one of the preceding claims, characterized by the fact that the through-hole (13) for receiving the locking pin (9) is formed in the area of the fitting hole (29).
10. Actuating device (1) according to one of the preceding claims, characterized in that the valve rod (7) has a shoulder (51) for limiting its screw-in depth, for bearing against a limiting surface (53) of the actuator (5).
11. Actuating device (1) according to one of the preceding claims, characterized by the fact that the through-bore (13) has at least two sections (55, 57) with different diameters.
12. Actuating device (1) according to one of the preceding claims, characterized by the fact that The penetration depth of the locking pin (9) into the through hole (13) is limited by the geometry of a flat surface (63) formed on one side (59) of the through hole (13).
13. Actuating device (1) according to one of the preceding claims, characterized by the fact that the locking pin (9) is unthreaded.
14. Actuating device (1) according to one of the preceding claims, characterized by the fact that the locking pin (9) is designed as a grooved pin (45) which deforms when placed in the through-hole (13).