Actuating device for adjusting fluid flow in a process plant

Abstract

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 attachment 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) in a form-fitting manner, characterized in 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-bore (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) via the receiving area (33) in a form-fitting manner and essentially perpendicular to the central axis (17) of the valve rod (7).

Description

[0001] The present invention relates to an adjusting device for adjusting a fluid flow in process engineering plants, comprising a valve rod and an actuator connected thereto.

[0002] Control devices are typically 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 media fluids flowing through a control valve is required.

[0003] One of the challenges in designing such an actuator is to make the connection between the valve stem and the actuator both stable and easy to install, while minimizing the risk of malfunctions such as twisting or loosening of the connection.

[0004] In the prior art, the connection between a valve stem and valve cone is often realized by a simple threaded connection, as described, for example, in WO 2009 / 076068 A1. 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, particularly during vibrations or temperature changes. Furthermore, such designs often require additional lifting equipment when assembling heavy valves, which makes the installation process more complex.

[0005] An alternative solution, as described for example in EP 3224510, provides for a locking connection in which a locking means designed as an open ring is used to produce a positive connection between a valve stem and a throttle body of a corresponding valve arrangement.

[0006] DE 10 2017 123 308 B4 discloses a control valve with a valve piston connected to a valve rod. To connect the valve rod to the valve piston, a separate flange is attached to the valve rod, which is screwed to the valve piston via several threaded connecting elements. The flange and the valve rod are connected to each other via a threaded connection. To secure the threaded connection between the flange and the valve rod, a toothed section with external teeth on the valve rod, a gear ring part separate from the flange 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 gear ring part, locking it in place. The external teeth of the toothed section of the valve rod engage with the internal teeth of the gear ring part when the control valve is installed.

[0007] It is an object of the invention to provide a connection between a valve rod and an actuator which is simplified compared to the prior art and at the same time reliable, which enables a compact design and is easy to assemble.

[0008] The present invention solves this problem by an adjusting device having the features according to claim 1.

[0009] According to the invention, an adjusting device for adjusting a fluid flow in a process plant comprises an adjusting element connected to a valve rod and formed integrally at least in a connecting region for connection to the valve rod, wherein the valve rod is connected to the adjusting element via a screw connection, and wherein the valve rod is held on the adjusting element by means of a locking pin to prevent movement relative to the adjusting element. On the outer surface of the valve rod, a receiving region is formed for at least partially receiving the locking pin, wherein the adjusting element is formed with a through-bore for receiving the locking pin when arranged on the valve rod, and wherein the locking pin is arranged essentially perpendicular to the central axis of the valve rod in a position engaging the valve rod via the receiving region.

[0010] The inventive design, through the use of the locking pin, creates a torsion-proof connection between the valve stem and the actuator, particularly during operation. This fixation prevents unwanted relative movement of the valve stem and actuator, thereby ensuring the reliable function of the actuating device even under extreme operating conditions, such as high pressures or significant temperature fluctuations. Overall, the fixation of the valve stem and actuator by the locking pin contributes to the stability of the entire actuating device.

[0011] Furthermore, the locking pin's position contributes to reducing the risk of errors during the assembly process. The locking pin's position, determined by the mounting area in the assembled state, ensures precise alignment of the components—the valve stem and the actuator—to each other. Subsequent or additional alignment or correction during assembly is not required, thus reducing the risk of misalignment and increasing assembly accuracy.

[0012] The locking pin is designed to fix and secure the actuator in the desired position relative to the valve stem. The locking pin is specifically constructed to create a positive connection between the components. Such a connection is achieved when the geometries of the locking pin and the corresponding receptacle in the components are matched so precisely that they lock into place without additional forces or friction. A simple example of a positive connection would be a cylindrical locking pin which, due to its exact fit in a corresponding bore, prevents any movement between the valve stem and actuator. The positive connection ensures that the components are reliably held in the desired position without the need for 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 accidentally separating.

[0013] The locking pin's perpendicular arrangement to the central axis distributes the forces evenly across the length of the pin. This ensures an optimal connection between the valve stem and the actuator without the occurrence of point loads. A further advantage of this alignment is that the precise locking of the locking 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 actuating 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 adaptation between the valve cone and 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 actuating device. The valve piston can, for example, interact directly with a seat by sealing it or releasing it to generate the desired flow rate. Regardless of the specific design, the actuator is connected to the valve rod via the screw connection and positively fixed by the locking pin.This connection ensures stable and reliable function of the control valve, regardless of whether the actuator is designed as a valve cone or a valve piston.

[0015] The through-bore in the actuator refers to the opening through which the actuator at least partially passes. It is expediently designed with open ends on both sides. The through-bore interacts with the receiving area of ​​the valve stem and thus forms an overall receptacle for the locking pin. In other words, the receiving area for the locking pin is aligned so that it is flush with the through-bore in the actuator when the valve stem is screwed into the actuator. The diameter and orientation of the through-bore are selected so that when the locking pin is received or inserted, a positive connection is created between the valve stem and the actuator, ensuring the desired rotationally secure positioning of the components relative to one another.

[0016] The receiving area for the locking pin can generally be implemented in a variety of designs, depending on the requirements for the connection and assembly. In one possible design, the receiving area is formed as a single receptacle, utilizing only a portion of the outer circumference of the valve stem. In this case, the locking pin would be located at a predefined location.

[0017] Alternatively, the receiving area can be formed by several individual receptacles arranged perpendicular to the central axis of the valve rod, so that there are several predefined positions at which the locking pin can be inserted. Depending on the orientation or position of the valve rod within the actuator, the locking pin can be received in at least one of the individual receptacles provided. The individual receptacles are preferably evenly spaced from one another perpendicular to the central axis. Furthermore, it is possible for the individual receptacles to be positioned relative to one another in such a way that the locking pin is received in several individual receptacles simultaneously. This can, for example, enable more stable fixation or more flexible handling during assembly.

[0018] Another option is to design a circumferential receiving area so that the locking pin can be positioned at any point along the circumference of the valve stem. This enables quick and easy assembly while simultaneously ensuring the desired, twist-free positioning of the valve stem and actuator relative to each other.

[0019] In particular, the receiving area is designed to extend all the way around the valve rod. This design allows the locking pin to be positioned at any point along the valve rod. This allows for particularly flexible handling during assembly and use of the device, without the need for specific orientation specifications for the valve rod.

[0020] Conveniently, the at least one receiving area on the outer surface of the valve rod is formed perpendicular to the center axis of the valve rod. The vertical orientation of the receiving area ensures optimal mechanical fixation of the locking pin, since the forces acting axially on the valve rod are not directly transferred to the locking pin. This minimizes wear and increases operational reliability. Furthermore, the vertical orientation facilitates assembly. Likewise, the through-hole is conveniently formed perpendicular to the center axis of the valve rod. The through-hole and the receiving area together form the overall receptacle or overall guide for the locking pin.

[0021] In a further advantageous embodiment of the invention, the at least one receiving area is formed substantially uniformly around the center axis of the valve rod. This uniform design ensures symmetrical force transmission between the connected components, i.e., the valve rod and the actuator, and thus reduces asymmetric loads or local overstressing.

[0022] Particularly preferably, the at least one receiving area is designed as an annular groove surrounding the outer circumference of the valve rod. The annular groove provides a universal receptacle for the locking pin and allows quick, easy installation at any position around the circumference of the valve rod within the annular groove. The continuous annular groove also ensures uniform force application along the entire circumference of the valve rod, which reduces material stress and wear. The circumferential design significantly simplifies installation, as the orientation of the valve rod plays a role in the assembly of the actuating device, which is a significant advantage, particularly for more complex or difficult-to-access structures.

[0023] Further preferably, the locking pin is arranged in the through-bore of the actuator, wherein the through-bore is at least partially open toward the outer surface of the valve stem in the region of the inner circumference of the actuator. Functionally, the opening of the through-bore toward the valve stem leads to precise positioning of the locking pin in the corresponding receiving area, thereby ensuring a positive fit 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.

[0024] Advantageously, the outer surface of the locking pin, when installed, is in contact with the inner surface of the receiving area, at least in some sections. This contact, preferably gap-free at least in some 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 localized loads.

[0025] Preferably, the valve rod has an external thread in a first section, via which the valve rod is secured in the actuator. Further preferably, the actuator is formed with a cylindrical axial bore having an internal thread in at least a first section. During assembly of the actuating device, the external thread of the valve rod is screwed into the internal thread formed in the first section of the actuator, forming a stable screw connection. The screw or threaded connection ensures high tensile strength and prevents the components from becoming detached from one another during operation.

[0026] In a further embodiment, the cylindrical axial bore has, in at least a second section, a fitting bore whose diameter is larger than the internal thread, which serves to precisely align the valve stem in the actuator. When in contact with the corresponding mating surface of the valve stem, the fitting bore ensures its appropriate guidance, centering, and alignment. The enlarged diameter of the fitting bore offers precise guidance and alignment, ensuring minimal tilting of the valve stem. The risk of play and wear is correspondingly reduced. The combination of the internal thread for securing the valve stem and the fitting bore for guiding it ensures optimal functionality and even load distribution, which significantly improves the service life and operational reliability of the actuating device.The distance of the fitting hole from the center axis of the valve rod is adapted to the geometry of the valve rod.

[0027] In a preferred embodiment of the invention, the through-hole for receiving the locking pin is formed in the area of ​​the fitting 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 incorrect alignment or loosening of the pin during operation and ensures long-term functionality of the actuating device.

[0028] In a further advantageous embodiment, the valve stem has a shoulder to limit its screw-in depth, which rests against a boundary surface of the actuator. The shoulder ensures that the valve stem reaches a precise and defined penetration depth when screwed into the actuator, but does not exceed it. This prevents overloading of the connection or impairment of the functionality of the actuating device. Furthermore, the shoulder ensures a reliable and stable contact surface between the valve stem and the actuator, which increases the strength and durability of the connection. The shoulder thus contributes to improved assembly accuracy and mechanical stability and minimizes the likelihood of malfunctions during operation.

[0029] 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 rod is screwed into the actuator and rests with the shoulder on the boundary surface of the actuator.

[0030] The through-bore preferably has at least two sections with different diameters. On the inlet side, i.e., the side where the locking pin is inserted during assembly of the actuating device, the diameter is larger than on the outlet side. The reduced diameter on the outlet side of the through-bore acts as a mechanical barrier, preventing the locking pin from being pushed out during impact or insertion and ensuring that it remains in its intended position. This also offers the advantage that the locking pin can be removed from the through-bore in the opposite direction to the direction of insertion if necessary, for example, during maintenance or component replacement. The valve rod is preferably reusable.

[0031] 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 by a flat surface prevents the locking pin from penetrating too deeply into the hole, thereby 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, thus contributing to the increased stability and safety of the entire actuating device.In addition, the geometry of the flat surface ensures reproducible and consistently high manufacturing accuracy, which leads to better process control and a longer service life of the device.

[0032] In principle, the locking pin can have various designs. The cross-section of the locking pin can be cylindrical, conical, or oval, for example. Likewise, the surface can be smooth, roughened, or provided with structural features such as notches, grooves, or serrations to adapt the fixation to specific requirements. The locking pin can be made of different materials, such as metal, plastic, or composite materials, to ensure the desired properties in terms of strength, corrosion resistance, or thermal stability. It can be installed by pressing, hammering, or other mechanical methods.

[0033] Preferably, the locking pin is threadless. A threadless locking pin can be inserted more easily into pre-drilled holes and requires less precise tolerances, which reduces production costs. Furthermore, a threadless design enables simple and quick assembly, as no screw connections are required. Assembly can be performed, for example, by pressing in, driving in, or other mechanical methods. Furthermore, the absence of threads prevents local stresses and evenly distributes the mechanical load.

[0034] Particularly preferably, the locking pin is designed as a grooved pin that deforms upon placement in the through-hole. This deformation ensures increased holding force through frictional engagement and enables a secure connection without the need for additional securing elements. Such a grooved pin adapts to manufacturing tolerances and can therefore be used in holes of different sizes. This increases application flexibility and reduces the need for precise component tolerances. At the same time, the targeted deformation allows for vibration-resistant fixation, as the grooved pin conforms to the contours of the hole, effectively preventing movement. In addition, the pressing in of the grooved pin creates a supporting frictional engagement, which further increases the stability of the connection.The combination of positive and frictional engagement not only ensures high load-bearing capacity, but also easy installation, as the grooved pin can be used without complex screw connections or additional fastening elements.

[0035] In the following, exemplary embodiments and alternative solutions of the invention are explained in more detail with reference to a drawing. The exemplary embodiments contain numerous features in combination. Those skilled in the art will expediently consider the features individually and combine them into further meaningful combinations. Identical or functionally similar components shown in different figures bear the same reference numerals to maintain clarity and avoid repetition. A person skilled in the art will easily be able to follow this assignment and understand that these components fulfill the same functions, regardless of their specific representation in the individual figures.

[0036] Here we show: Fig. 1 an adjusting device in a three-dimensional representation, Fig. 2 the adjusting device according to Fig. 1 in a sectional view, as well as Fig. 3 a section of the actuator according to the Fig. 1 and Fig. 2 in a three-dimensional representation.

[0037] Fig. Figure 1 shows a three-dimensional representation of an actuating device 1 for adjusting a fluid flow in a process plant, comprising an actuator 5, in this case designed as a valve piston 3, and a valve rod 7. The actuator 5 is formed in one piece, at least in the connecting region 8 for connection to the valve rod 7.

[0038] To fix the components 5, 7 together, a locking pin 9 is inserted in the connecting area 8, which, in the assembled state of the actuating device 1, 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 rod 7 and its corresponding fixation is described below in the Fig. 2 and Fig. 3 described in detail.

[0039] Fig. 2 shows the adjusting device 1 according to Fig. 1 in a sectional view. This view clearly shows the connection between valve rod 7 and valve piston 3. The valve piston 3 has a cylindrical axial bore 15 in two different sections 19, 21 along the central axis 17 of the valve rod 7. In the first section 19, the cylindrical axial bore 15 has an internal thread 23 which engages with a corresponding external thread 27 formed on the outer circumference 25 of the valve rod 7. The connection in the first section 19 is therefore made via a screw connection, which ensures a stable arrangement of the valve rod 7 and the actuator 5. The screw connection ensures high tensile strength and prevents the components 5, 7 from becoming detached from one another during operation of the actuating device 1.

[0040] In the second section 21, the cylindrical axial bore 15 is formed with a fitting bore 29 whose diameter is larger than that of the internal thread 23. The fitting bore 29, which is larger in diameter than the first section 19, ensures the precise alignment of the valve rod 7 and its central position. The enlarged diameter of the fitting bore 21 provides precise guidance and a play-free fit, which minimizes tilting of the valve rod 7 in the assembled state.

[0041] In the area of ​​this second section 21, i.e. in the area of ​​the enlarged fitting bore 29, the locking pin 9 is inserted for additional securing of the valve rod 7 and the valve piston 3, which forms a positive connection between the valve rod 7 and the valve piston 3.

[0042] For positioning the locking pin 9, the valve rod 7 comprises 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 an overall receptacle 35 for the locking pin 9. The receiving area 33 is designed here as an annular groove 37 surrounding the valve rod 7, which extends uniformly around the central axis 17 of the valve rod 7. In this way, it offers a universal receptacle for the locking pin 9 and allows quick, easy assembly regardless of the orientation of the valve rod 7.

[0043] The through-bore 13 is formed with open ends 39, 41 on both sides, although in this case, only one open end 39 is visible due to the illustration. It interacts with the receiving area 33 of the valve rod 7 and thus forms the overall receptacle 35. For this purpose, the through-bore 13 is open in the area of ​​the inner circumference 43 of the actuator 5, toward the outer surface 31 of the valve rod 7, ensuring a positive fit between the actuator 5 and the valve rod 7.

[0044] The locking pin 9, which is positively positioned in the circumferential annular groove 37 of the valve rod 7, is designed here as a thread-free, deformable grooved pin 45 and engages in the annular groove 37 perpendicular to the central axis 17 of the valve rod 7. When inserted into the through-bore 13 of the actuator 5 and the receiving area 33 of the valve rod 7, the grooved pin 45 deforms elastically, which leads to surface contact between the outer surface 31 of the valve rod 7, the inner surface 47 of the annular groove 37, and the outer surface 49 of the grooved pin 45 resting against both surfaces 31, 47.

[0045] Overall, this arrangement enables a secure and stable connection between actuator 5 and valve rod 7, which can withstand high mechanical loads and is easy to install.

[0046] To limit the screw-in depth of the valve rod 7 into the cylindrical axial bore 9, the valve rod 7 has a shoulder 51 that rests against a limiting surface 53 of the valve piston 3. The shoulder 51 ensures that the valve rod 7 reaches the desired, defined penetration 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 one another in such a way that the locking pin 9 can be easily and accurately inserted into the overall receptacle 35 formed thereby.

[0047] Fig. 3 shows a section of the actuator 5 of the actuating device 1 designed as a valve piston 3 according to the Fig. 1 and Fig. 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 here) and, together with the receiving area 33 formed as an annular groove 37 (not shown here), forms the overall receptacle 35 (not shown here) or the overall guide for the locking pin 9. For this purpose, the through-bore 13 is open in the area of ​​the inner circumference 43 of the actuator 5 toward the outer surface 31 of the valve rod 7.

[0048] The through-bore 13 is formed in the area of ​​the fitting bore 29 of the valve piston 3 with two sections 55, 57 of different diameters, which are optimized for the positioning and assembly of the locking pin 9 (not shown here). At the inlet side 59, i.e., at the first open end 39 of the through-bore 13, from which the locking pin 9 is inserted, the diameter is larger than at the outlet side 61. The reduced diameter on 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, preventing the locking pin 9 from being pushed out during impaction or insertion and ensuring that it remains in its intended position.

[0049] Due to the design of the bore as a through-bore 13 with ends 39, 41 open on both sides, it is ensured that the locking pin 9 can be removed from the through-bore 13 in the opposite direction to the direction of insertion if necessary, for example in the case of maintenance or replacement of components.

[0050] 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 into the through-hole 23 precisely and in a controlled manner using an appropriate tool, without exceeding the specified tolerances.

[0051] The information contained in the present Fig.The features and functions illustrated in Figures 1 to 3 generally relate to the specific embodiment of the respective figure. However, it is obvious to a person skilled in the art that these features and functions can also be considered independently of one another and used in various 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 1 adjusting device 3 valve pistons 5 Actuator 7 Valve rod 8 Connection area 9 locking pin 11 Wall 13 Through hole 15 cylindrical axial bore 17 Central axis 19 first section valve rod 21 second section valve rod 23 Internal thread of the cylindrical axial bore 25 Outer circumference of the valve rod 27 External thread of the valve rod 29 fitting hole 31 outer surface of the valve rod 33 Recording area 35 total recording 37 Ring groove 39 open ending 41 open ending 43 Inner circumference of the actuator 45 grooved pin 47 Inner surface of the annular groove 49 outer surface of the locking pin 51 Valve stem shoulder 53 Boundary area 55 first section of the through hole 57 second section of the through hole 59 Entry side of the through hole 61 Exit side of the through hole 63 Plan area QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] WO 2009 / 076068 A1

[0004] EP 3224510

[0005] DE 10 2017 123 308 B4

[0006]

Claims

[1] Adjusting device (1) for adjusting a fluid flow in a process plant, comprising an actuator (5) connected to a valve rod (7) and formed integrally at least in a connecting region (8) for connection to the valve rod (7), wherein the valve rod (7) is connected to the actuator (5) via a screw connection, and wherein the valve rod (7) is held on the actuator (5) in a form-fitting manner by means of a locking pin (9) against movement relative to the actuator (5), characterized bythat a receiving area (33) for at least partially receiving the locking pin (9) is formed on the outer surface (31) of the valve rod (7), wherein the actuator (5) is formed with a through-bore (13) for receiving the locking pin (9) when arranged on the valve rod (7), and wherein the locking pin (9) is arranged substantially perpendicular to the central axis (17) of the valve rod (7) in a position in which it engages the valve rod (7) in a form-fitting manner via the receiving area (33). [2] Adjusting device (1) according to claim 1, characterized by that the at least one receiving area (33) is formed perpendicular to the central axis (17) of the valve rod (7). [3] Adjusting device (1) according to claim 1 or 2, characterized by that the at least one receiving area (33) is formed substantially uniformly around the central axis (17) of the valve rod (7). [4] Adjusting device (1) according to one of the preceding claims, characterized by that the at least one receiving area (33) is designed as an annular groove (37) surrounding the outer circumference (25) of the valve rod (7). [5] Adjusting device (1) according to one of the preceding claims, characterized by that the locking pin (9) is arranged in the through-bore (13) of the actuator (5), wherein the through-bore (13) is at least partially open towards the outer surface (31) of the valve rod (7) in the region of the inner circumference (43) of the actuator (5). [6] Adjusting device (1) according to one of the preceding claims, characterized by that the outer surface (49) of the locking pin (9) in the installed state is in surface contact with the inner surface (47) of the receiving area (33) at least in sections. [7] Adjusting device (1) according to one of the preceding claims, characterized bythat the actuator (5) is formed with a cylindrical axial bore (9) which has, at least in a first section (19), an internal thread (23) into which an external thread (27) formed on the outer circumference (25) of the valve rod (7) engages. [8] Adjusting device (1) according to claim 7, characterized by that the cylindrical axial bore (9) has, in at least one second section (21), a fitting bore (29) which is larger in diameter than the internal thread (23) of the cylindrical axial bore (9) for aligning the valve rod (7) in the actuator (5). [9] Adjusting device (1) according to one of the preceding claims, characterized by that the through hole (13) is designed to receive the locking pin (9) in the area of the fitting hole (29). [10] Adjusting device (1) according to one of the preceding claims, characterized bythat the valve rod (7) has a shoulder (51) for contact with a boundary surface (53) of the actuator (5) to limit its screw-in depth. [11] Adjusting device (1) according to one of the preceding claims, characterized by that the through-bore (13) has at least two sections (55, 57) with different diameters. [12] Adjusting device (1) according to one of the preceding claims, characterized by 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] Adjusting device (1) according to one of the preceding claims, characterized by that the locking pin (9) is thread-free. [14] Adjusting device (1) according to one of the preceding claims, characterized bythat the locking pin (9) is designed as a grooved pin (45) which deforms when arranged in the through-bore (13).

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