Positioning device

Abstract

The invention relates to an actuating device (10) for a processing system, comprising an actuating drive (12) with a drive rod (12a) that is mounted in the actuating drive (12) in an axially movable manner, an actuating valve (16) with a valve housing (16f) in which a valve rod (16a) is mounted that is connected to a valve element in an axially movable manner, and a connecting housing (14) which connects the actuating drive (12) and the actuating valve (16) together The drive rod (12a) and the valve rod (16a) are designed to transmit a drive force of the actuating drive (12) to the valve element, are connected together via at least one rod coupling (24b), and form a rod transmission (27), and an anti-rotation mechanism (30) is provided, comprising a clamping part (30a) and a sliding part (30b), wherein the clamping part (30a) is secured to the rod transmission (27) by means of a radially acting clamping, and the sliding part (30b) rests against the connecting housing (14), thereby preventing a rotation of the rod transmission, and the sliding part (30b) slides along the connecting housing (14) during a stroke movement of the actuating drive (12), and thus the rod transmission (27). The anti-rotation mechanism (30) is designed as a separate component which is independent of the at least one rod coupling (24b) and which can be released from the rod transmission (27), and the clamping part (30a) comprises clamping elements which convert an axially introduced force into the radial clamping.

Description

[0001] actuator

[0002] The invention relates to an actuating device for a process plant according to the type specified in the preamble of claim 1, as well as to a system of an actuating device according to the type specified in claim 26.

[0003] In process engineering plants, for example, process fluid flows in pipes are fed to process engineering processes via control valves. The process fluid flows must be adjusted according to specific control variables, including the flow rate, depending on the process and operation. Furthermore, these process fluid flows can be fed continuously or discontinuously into a process engineering process within the process engineering plant. The control valves are used to control and regulate these process fluid flows.

[0004] Such control devices have been known for some time and typically comprise an actuator and a control valve. The actuator is provided with an actuator housing and an actuator stem mounted in the actuator housing. The actuator housing is connected to the control valve, namely the control valve housing, via a connecting housing, for example a yoke. A valve seat is provided in the control valve housing and is arranged between the inlet with an inlet opening and the outlet with an outlet opening of the control valve. The inlet is fluidically connected to the outlet. A valve rod with a valve element, for example a valve cone, is arranged in the control valve. The valve rod is designed to be axially movable. Through the interaction of the valve element and valve seat, for example by raising and lowering the valve element, the flow rate of a process fluid flowing through the control valve can be adjusted.

[0005] To configure new control devices, a variety of actuators and control valves of different sizes can be combined. For this, the lengths of the connecting housing and the actuator and valve stem must be matched to the desired stroke of the actuator and valve element.

[0006] In the valve housing, the actuator stem and valve stem are connected to each other with a rod coupling. The rod coupling can have an anti-rotation device that prevents the actuator stem or valve stem from rotating relative to the valve element during operation. The valve cone is exposed to high process pressures. An asymmetrical valve cone geometry can lead to a torque on the valve stem or actuator stem. High torques can cause the valve stem to rotate at the rod coupling. Furthermore, the flow characteristics of the process fluid depend on the angular position of the valve cone relative to the outlet of the control valve housing. If the valve cone rotates, a specified flow characteristic cannot be maintained. Cones or pistons with asymmetrical control contours and / or irregularly arranged or differently sized openings are particularly affected.Furthermore, wear and internal sealing are impaired with rotating valve cones. With an asymmetrical distribution of openings or with differently sized control piston openings, it is advantageous to align the valve element or valve cone with the openings for optimal flow. It is also advantageous to protect the actuator from twisting or torque on the actuator stem to avoid additional stress on the diaphragm or seal and prevent damage.

[0007] Anti-rotation devices are well known, including from EP°2 O 647 O 892 O A1 and DE°20 o 2020 o 102 o 122 o U1.

[0008] In the EP°2 O 647 O 892 OA1 discloses a slide valve in a slide valve housing, wherein the slide valve is connected to a spindle drive. An anti-rotation device is attached to the spindle drive. The anti-rotation device comprises two half-shell parts that are screwed together tangentially with respect to the adjusting spindle in such a way that a rod coupling of the spindle drive is clamped. The anti-rotation device is connected to a rod on each side of the rod coupling in the area of ​​the housing in such a way that the rod is encompassed by both half-shell parts when connected.

[0009] The DE°20 o 2020 o102°122°U1 discloses a control device for a process plant with a yoke arranged between the actuator and the control valve. In the area of ​​the yoke, the actuator rod is connected to an adjusting rod via a rod coupling. The adjusting rod is connected at its other end to the valve rod via another rod coupling. The rods are each coaxial with each other. The second rod coupling is designed as an anti-twist device and also comprises two half-shell parts that are screwed together tangentially to the rods, thereby axially fixing the adjusting rod and the valve rod to each other. Furthermore, a rail element is arranged on an inner wall of the yoke. The anti-twist device is guided axially on the rail when connected. The rail also serves to counteract twisting.

[0010] Both of these anti-twist designs have the disadvantage that assembly using the two half-shells is complex. Furthermore, adjusting the angular position of the valve stem, and thus the angular position of the valve cone relative to the control valve outlet, is complicated and time-consuming. When clamping the valve using the two half-shells, the angular position of the stems and the axial distance between the stems must be adjusted simultaneously.

[0011] The invention is therefore based on the object of developing a control device according to the type specified in the preamble of claim 1 in such a way that, on the one hand, assembly of the anti-twist device is easily possible and, on the other hand, adjustment of the angular position of the valve rod or the valve cone to the outlet of the control valve is easily possible.

[0012] These objects are achieved by the characterizing features of claim 1 in conjunction with its preamble features.

[0013] The subclaims form advantageous developments of the invention.

[0014] According to the invention, a control device for a process plant comprises an actuator with an actuating rod mounted axially movably in the actuator, a control valve with a valve housing in which an axially movable valve rod connected to a valve member is mounted, and a connecting housing which connects the actuator and the control valve to one another. The actuator is preferably designed with a support plate-diaphragm arrangement in an actuator housing. The actuating rod and the valve rod are designed to transmit a driving force of the actuator to the valve member and are connected to one another via at least one first rod coupling. The actuating rod, the valve rod, and the first rod coupling form a rod transmission. Furthermore, an anti-rotation device with a clamping part and a sliding part is provided. The clamping part is fastened to the rod transmission by a radially acting clamp.The sliding part rests against the connecting housing, particularly axially guided. This prevents twisting. During a lifting movement of the actuator and thus the rod transmission, the sliding part slides along the connecting housing.

[0015] The anti-rotation device is designed as a separate component independent of the at least one first rod coupling and detachable from the rod transmission. This ensures that a simple radial clamping mechanism ensures a robust frictional connection between the anti-rotation device and the rod transmission, while also allowing for simple and uncomplicated release of the clamping mechanism, allowing the angular position of the valve cone relative to the outlet to be easily adjusted.

[0016] According to the invention, the clamping part comprises clamping elements that convert an axially applied force into radial clamping. The clamping elements enable a simple conversion of axial force into radial clamping. This type of coupling allows for the generation of larger clamping forces. The clamping elements allow for a favorable transmission ratio of axially applied force to radial clamping.

[0017] Preferably, the clamping part of the anti-rotation device is arranged on the first rod coupling, and the clamping elements rest against the first rod coupling. This allows the valve rod and actuator rod to be designed to be adjustable without having to release the anti-rotation device. Furthermore, the rod coupling can have complementary retaining structures on its radial outer side, complementary to the clamping elements, designed to improve clamping. Commercially available valve rods and actuator rods would require complex subsequent machining, whereas rod couplings with retaining structures are easy to produce.

[0018] According to a further advantageous embodiment of the invention, the clamping part comprises a clamping housing, wherein the clamping elements are arranged at least partially in the clamping housing. The clamping housing serves to support, guide, and protect the clamping elements.

[0019] The terminal housing preferably has a passage through which the rod assembly passes. The passage is preferably formed concentrically in the terminal housing, with the clamping elements arranged on the radial outer side of the passage. This allows the clamping elements to be designed such that they essentially completely encompass the rod coupling. This results in evenly distributed clamping on the rod coupling.

[0020] The clamping elements preferably comprise a support ring, a force transmission ring, a first wedge ring, and a first clamping module. The multi-part design of the clamping elements enables reliable conversion of axial force to radial clamping through the different properties of the individual components.

[0021] According to a further advantageous embodiment of the invention, the first clamping module comprises two half rings arranged at a distance from one another in the circumferential direction. This simplifies the assembly and replacement of the clamping modules in the event of damage or wear. Furthermore, the spacing between the two half rings allows the two half rings to move toward each other.

[0022] The support ring preferably rests against the force transmission element in the axial direction. The force transmission element rests against the first wedge ring, and the first wedge ring rests against the first clamping module in a support area. The first wedge ring and the first clamping module each have a complementary contour in the support area. The contours are designed such that when the first wedge ring is axially displaced, the axially introduced force moves the half rings radially inward into the feedthrough. The axial force is initiated by the support ring. The support ring presses the force transmission element in the axial direction and displaces it. The first wedge ring is pressed and displaced in the axial direction by the force transmission element.Due to the complementary contours of the first wedge ring and the first clamping module, the first clamping module is displaced in the radial direction by the axial movement of the first wedge ring and thus clamps with the rod transmission.

[0023] The clamping elements preferably comprise a second wedge ring and a second clamping module. The second clamping module comprises two half rings arranged at a distance from one another in the circumferential direction.

[0024] According to a further advantageous embodiment of the invention, the second wedge ring rests on one side of the second clamping module in the axial direction. The first clamping module is arranged at a distance on the other side. The second clamping module rests on a shoulder of the clamping housing on the other side. The second wedge ring and the second clamping module each have a complementary contour in the support area, so that the axially applied force causes the first clamping module to displace the second wedge ring in the axial direction, and the half rings are moved radially inward into the bushing.

[0025] When a sufficiently high axial force is applied, the second wedge ring is pushed and displaced in the axial direction by the first clamping module. Due to the complementary contours of the second wedge ring and the second clamping module, the second clamping module is displaced in the radial direction by the axial movement of the second wedge ring, thereby clamping the rod transfer. The second clamping module and the second wedge ring create a larger clamping surface. This increases the clamping force between the clamping part and the rod transfer.

[0026] Preferably, the contour is formed by a wedge shape resulting from the section. This ensures an easy-to-manufacture contour.

[0027] Preferably, the axial force is introduced into the clamping elements by screws engaging the clamp housing. The clamp housing has complementary threaded receptacles for this purpose. The screws interact with the support ring and the clamp housing and are mounted in such a way that the axial distance between the support ring and the clamp housing can be adjusted when the screws are moved. The axially arranged screws allow for very precise adjustment of the clamping forces. Larger clamping forces can be generated with lower screw torques.

[0028] According to a further advantageous embodiment of the invention, the clamping part and the sliding part are detachably connected to one another. This allows both parts to be removed independently of each other for maintenance or in the event of wear.

[0029] The sliding part is preferably U-shaped. The sliding part is guided axially on the connecting housing. The sliding part has a plurality of sliding elements with which the sliding part is guided on a guide in the connecting housing. The U-shaped design of the sliding part provides axial guidance on the one hand, and the sliding part counteracts rotational movement on the other. The sliding elements are preferably designed as wearing parts and can be easily replaced if necessary. The sliding elements can therefore have different material properties than the sliding part itself. Due to the force effect of the rod transmission, the sliding part must be significantly more robust than the sliding elements. The sliding elements are preferably arranged on both outer sides of the respective legs of the U-shape. This allows the guide to be formed on the two outer sides of the respective legs.

[0030] According to a further advantageous embodiment of the invention, the sliding elements are arranged one above the other in the axial direction in the sliding part. The guide can thus be designed such that the axial extension is significantly greater than the radial extension.

[0031] Preferably, the guide of the connecting housing is made of metal and the sliding elements are made of plastic. This ensures that the sliding elements are designed as cost-effective wear parts.

[0032] The sliding elements preferably have markings to indicate wear on the sliding elements caused by friction with the guide. The distance between the marking and the end of the sliding elements resting against the guide provides information about the condition of the sliding elements. This allows the sliding strength of the anti-rotation device to be generally monitored.

[0033] According to a further advantageous embodiment of the invention, the rod transmission comprises an adjusting rod and a second rod coupling. The actuator rod is coaxially connected to a first end of the adjusting rod by means of a first rod coupling. The free end of the valve rod is coaxially connected to the second end of the adjusting rod by a second rod coupling. The adjusting rod makes it possible to easily adjust the length between the actuator rod and the valve rod. This makes the actuator more versatile for different lengths of valve rods and actuator rods.

[0034] Preferably, the clamping part of the anti-twist device is arranged on the second rod coupling and the clamping elements rest on the second rod coupling.

[0035] The connecting housing is preferably formed with a first housing part and a second housing part. The second housing part is formed by a plurality of connecting rods, and the guide for the anti-rotation device and the anti-rotation device are arranged in the second housing part. The two-part design makes it possible for the length of the connecting housing to be adapted to the total length of the drive rod, adjusting rod, and valve rod. According to a further advantageous embodiment of the invention, the guide is formed between two adjacent connecting rods. This simply integrates the guide between two existing components. This avoids the need for an additional guide on the second connecting housing.

[0036] Preferably, the second housing part has a connecting flange. The connecting flange is connected to the control valve on one side and to the connecting rods on the other side. The connecting flange makes it possible to easily connect the connecting housing to the control valve.

[0037] Preferably, the connecting rods are detachably connected to the first housing part and the connecting flange. The detachable design of the connecting rods allows for easy replacement, for example, in the event of damage.

[0038] According to a further advantageous embodiment of the invention, the second rod coupling has an adjustment device. The adjustment device allows the axial distance between the valve rod and the adjusting rod to be adjusted. This allows the maximum stroke of the valve member relative to the valve seat to be adjusted.

[0039] The adjustment device preferably has a first and a second side. A right-hand thread is formed on the first side, and a left-hand thread on the second side. The adjustment rod and the valve rod each have a correspondingly complementary counter-thread at one end. By designing the adjustment device with two different threads, it is possible to easily adjust the distance between the valve rod and the adjustment rod by moving the adjustment device around a rotational axis.

[0040] A further aspect of the invention relates to a system of an actuating device according to one of the preceding claims, wherein a plurality of second housing parts of different lengths, a plurality of differently designed actuators and / or control valves, and a plurality of differently designed adjusting rods are provided. This makes it possible to adapt the connecting housing to actuators and control valves of different sizes in order to take up as little installation space as possible. The different lengths of actuators and control valves also make it possible to use the actuating device for different requirements of a process plant. Further advantages, features, and possible applications of the present invention will become apparent from the following description in conjunction with the exemplary embodiments illustrated in the drawings.

[0041] In the description, claims, and drawings, the terms and associated reference symbols used in the list of reference symbols below are used. In the drawings, the following definitions apply:

[0042] Fig. 1 is a side sectional view of the actuator;

[0043] Fig. 2 is a perspective detailed view of the second housing part of the anti-twist device built into the actuator, viewed diagonally from above;

[0044] Fig. 3 is a perspective view of the anti-rotation device;

[0045] Fig. 4 a top view of the anti-rotation device, and

[0046] Fig. 5 a side sectional view of the anti-twist device.

[0047] Fig. 1 shows a side sectional view of an actuator 10 according to the invention.

[0048] The actuator 10 comprises an actuator 12, a connecting housing 14 and a control valve 16. The connecting housing 14 is formed in two parts and comprises a first housing part 18 and a second housing part 20. The actuator 12 is formed rotationally symmetrically about an axis 22.

[0049] The actuator 12 comprises an actuator housing 12c, which is internally separated by a support plate-diaphragm arrangement 12b into a working chamber 12f and a return chamber 12g. The actuator housing 12c is provided with a pneumatic input connection 12h, via which the working chamber 12f can be subjected to a control pressure. The working chamber 12f is separated from the return chamber 12g in a fluid-tight manner by the support plate-diaphragm arrangement 12b. Return springs 13 are arranged in the return chamber 12g. Via a control pressure, the support plate-diaphragm arrangement 12b is moved in one direction against the force of the return springs 13 and, when the control pressure decreases, in the other direction by the force of the return springs 13. The actuator 12 is a conventional actuator. The actuator 12 is connected to one end of the connecting housing 14, namely the first housing part 18.The other end of the connecting housing 14, namely the second housing part 20, is connected to the control valve 16.

[0050] The actuator 12 has a drive rod 12a in the actuator housing 12c, which extends partially into the first housing part 18 and is designed to be movable in the axial direction along the axis 22 over the actuator 12. An adjusting rod 26 is arranged partially in the first housing part 18.

[0051] A first end of the actuator rod 12a is connected in the first housing part 18 via a first rod coupling 24a to a first end of the adjusting rod 26 such that an axial movement of the actuator rod 12a can be transmitted. The actuator rod 12a and the adjusting rod 26 are arranged coaxially to each other and to the axis 22. The other end of the actuator rod 12a is connected to the support plate-diaphragm assembly 12b of the actuator 12 in the actuator housing 12c.

[0052] The first rod coupling 24a has two sides, with a threaded receptacle being introduced into the first rod coupling 24a from each side.

[0053] The first rod coupling 24a is designed such that the drive rod 12a is screwed into the first rod coupling 24a from the first side via an external thread with a corresponding internal thread of the first rod coupling 24a. The adjusting rod 26 is screwed into the first rod coupling 24a from the other side.

[0054] Other positive-locking connections between the drive rod 12a and the first rod coupling 24a and the adjusting rod 26 and the first rod coupling 24a are also conceivable.

[0055] The first housing part 18 is designed to be closed off to the outside and is connected to the actuator housing 12c.

[0056] The adjusting rod 26 extends into the second housing part 20. The other end of the adjusting rod 26 is connected in the second housing part 20 via a second rod coupling 24b to a valve rod 16a of the control valve 16, which extends into the second housing part 20. The adjusting rod 26 and the valve rod 16a are arranged coaxially with each other. The other end of the valve rod 16a is connected to a valve cone 16b in the control valve 16.

[0057] The second rod coupling 24b has an adjusting device 42 comprising a two-part internal thread. A right-hand thread is introduced on a first side and a left-hand thread on a second side. The adjusting rod 26 has an external thread at its other end, which is screwed in from the first side of the second rod coupling 24b. The valve rod 16a is screwed in from a second side of the second rod coupling 24b. By rotating the adjusting device 42 about the axis 22, the distance from the screwed-in end of the adjusting rod 26 to the screwed-in end of the valve rod 16a can be adjusted.

[0058] The rod transmission 27 is formed by the drive rod 12a, the first rod coupling 24a, the adjusting rod 26, the second rod coupling 24b and the valve rod 16a.

[0059] This makes it possible to easily adjust the length of the unit consisting of the adjusting rod 26, the second rod coupling 24b and the valve rod 16a by turning the second rod coupling 24b.

[0060] It is also conceivable that a left-hand thread is introduced into the second rod coupling 24b from the first side and a right-hand thread from the second side.

[0061] The second housing part 20 comprises four connecting rods 20a. The second housing part 20 has a stroke indicator 28. The stroke indicator 28 is arranged between the adjusting rod 26 and the second rod coupling 24b and a connecting rod 20a. A marking element 28a is provided on one connecting rod 20a. The marking element 28a has a scale for detecting and illustrating an axial movement of the unit consisting of the valve rod 16a, adjusting rod 26, and drive rod 12a.

[0062] Several connecting rods 20a of different lengths are provided. Furthermore, several actuators and control valves of different lengths, as well as several adjusting rods of different lengths, are provided.

[0063] Furthermore, an anti-rotation device 30 is provided in the second housing part 20. This device is arranged between a connecting rod 20a and the second rod coupling 24b. The anti-rotation device 30 has a clamping part 30a and a sliding part 30b. The anti-rotation device 30 is mounted axially guided between two adjacent connecting rods 20a via the sliding part 30b and is connected to the second rod coupling 24b in the clamping part 30a via a radially acting clamping connection. The anti-rotation device 30 is designed to counteract and prevent any rotational movement of the second rod coupling 24b or of the valve rod 16a with valve cone 16b.

[0064] The anti-rotation device 30 can also be arranged at another location on the rod transmission 27, for example on the first rod coupling 24a.

[0065] The anti-twist device 30 is designed to be height-adjustable due to the axial guidance along two connecting rods 20a.

[0066] The second housing part 20 further comprises a connecting flange 31. The connecting rods 20a are screwed to threaded receptacles of the connecting flange 31. The connecting flange 31 is connected to the control valve 16. The valve rod 16a is guided in the connecting flange 31. Seals (not shown here) are provided which seal the control valve 16 to the valve rod 16a.

[0067] The control valve 16 comprises a valve housing 16f with an inlet 16c and an outlet 16d. A valve seat 16e is arranged between the inlet 16c and the outlet 16d. The inlet 16c and the outlet 16d are fluidly connected via the valve seat 16e.

[0068] The end of the valve stem 16a has a valve cone 16b. The valve cone 16b interacts with the valve seat 16e. The axial position of the valve cone 16b relative to the valve seat 16e allows the process fluid flowing through the control valve 16 to be controlled and the flow rate to be adjusted.

[0069] Fig. 2 shows a perspective detailed view of the second housing part 20 of the anti-twist device 30 installed in the actuator 10, viewed obliquely from above.

[0070] The sliding part 30b of the anti-rotation device 30 is U-shaped. Three sliding elements 34 are arranged on the outer sides of each of the two legs 32a, 32b. The sliding elements 34 rest against the sides of the adjacent connecting rods 20a facing the sliding part 30b. The sliding elements 34 are detachably connected to the legs 32a, 32b. The sliding elements 34 are made of plastic and each have a marking 34a that indicates the wear of the sliding element 34.

[0071] The clamping part 30a and the sliding part 30b are detachably connected to each other, in this case screwed together.

[0072] The clamping part 30a has a clamping housing 36 with a central passage 36a (see Fig. 3) in which the second rod coupling 24b is arranged. A support ring 38 is arranged axially above the clamping housing 36. The support ring 38 is connected to the clamping housing 36 via four screws 40. The screws 40 apply axial force, and the distance between the support ring 38 and the clamping housing 36 can be adjusted.

[0073] Fig. 3 shows a perspective view of the anti-rotation device 30 from above.

[0074] Two wedge rings 44a, 44b and two clamping modules 46, 48 are arranged in the clamping housing 36 and radially outside the second rod coupling 24b. An annular force transmission element 50 is arranged between the first wedge ring 44a and the support ring 38.

[0075] Fig. 4 shows a top view of the anti-rotation device 30.

[0076] The clamping part 30a and the sliding part 30b are detachably connected to each other via connecting screws 52. The connecting screws 52 are arranged one above the other in the axial direction and rest on the outer side of the connecting piece between the first leg 32a and the second leg 32b of the sliding part 30b.

[0077] Fig. 5 shows a side sectional view of the anti-rotation device 30.

[0078] The two clamping modules 46, 48 are each formed in two parts and each comprise a first sub-module 46a, 48a and a second sub-module 46b, 48b. A distance in the circumferential direction is formed between the sub-modules 46a, 46b; 48a, 48b of the respective clamping module 46, 48.

[0079] The force transmission element 50 rests against the first wedge ring 44a. The first wedge ring 44a has a wedge-shaped contour in cross-section. The first clamping module 46 also has a wedge-shaped contour in cross-section. The first clamping module 46 is arranged relative to the first wedge ring 44a such that the inclined sides abut and the surface formed parallel to the axis 22 is oriented radially toward the passage 36a.

[0080] The first clamping module 46 rests against the second wedge ring 44b. The second wedge ring 44b has a wedge-shaped contour in cross-section. The second clamping module 48 also has a wedge-shaped contour in cross-section. The second clamping module 48 is arranged relative to the second wedge ring 44b such that the inclined sides abut and the surface parallel to the axis 22 is oriented radially toward the passage 36a. The second clamping module 48 rests on the lower side in the axial direction against a shoulder 36b of the clamping housing 36, which acts as a counterbearing.

[0081] Two connecting screws 52 are provided for connecting the clamping part 30a and the sliding part 30b.

[0082] By tightening the screws 40, the support ring 38 presses against the force transmission element 50 and displaces it in the axial direction. The force transmission element 50, in turn, displaces the first wedge ring 44a in the axial direction. Due to the contact of the inclined sides of the wedge-shaped contour of the first wedge ring 44a and the first clamping module 46, the two sub-modules 46a, 46b are displaced radially inward and ultimately clamp against the second rod coupling 24b.

[0083] When a certain axial force is applied by tightening the screws 40, the first clamping module 46 is additionally displaced in the axial direction. As a result, the first clamping module 46 presses the second wedge ring 44b and displaces it in the axial direction. Due to the contact of the inclined sides of the wedge-shaped contour of the second wedge ring 44b and the second clamping module 48, the two sub-modules 48a, 48a are displaced radially inward and ultimately clamp against the second rod coupling 24b.

[0084] Due to the two clamping modules 46, 48 being clamped to the second rod coupling 24b, the clamping modules 46, 48 are firmly connected to the second rod coupling 24b, thereby preventing twisting of the rod transmission 27.

[0085] The clamping mechanism allows for easy mounting of the anti-rotation device 30 on the rod transmission. At the same time, despite the clamping of the anti-rotation device 30, the angular position in the circumferential direction relative to the axis 22 of the valve rod 16a or the valve cone 16b to the outlet 16d of the control valve 16 can be easily adjusted. Furthermore, the adjustment device 42 also allows for easy adjustment of the distance between the opposite ends of the adjusting rod 26 and the valve rod 16a.

[0086] Reference symbol list

[0087] 10 Actuator

[0088] 12 Actuator

[0089] 12a Actuator rod 12

[0090] 12b Support plate-diaphragm arrangement of the actuator 12

[0091] 12c Actuator housing

[0092] 12d Sealing elements of the actuator 12

[0093] 12e Guide of the actuator 12

[0094] 12f Working chamber of the actuator 12

[0095] 12g Actuator return chamber 12

[0096] 12h pneumatic input connection of the actuator 12

[0097] 13 Return spring

[0098] 14 connection housings

[0099] 16 Control valve

[0100] 16a Valve stem of the control valve 16

[0101] 16b Valve cone of control valve 16

[0102] 16c Inlet of control valve 16

[0103] 16d Outlet of control valve 16

[0104] 16e Valve seat of the control valve 16

[0105] 16f Valve housing of control valve 16

[0106] 18 first housing part

[0107] 20 second housing part

[0108] 20a Connecting rod of the second housing part 20 22 Axis

[0109] 24a first rod coupling

[0110] 24b second rod coupling

[0111] 26 Adjusting rod

[0112] 27 Rod transmission

[0113] 28 Stroke indicator device

[0114] 28a Marking element of the stroke indicator 28

[0115] 30 Anti-twist device

[0116] 30a Clamping part of the anti-twist device 30

[0117] 30b Sliding part of the anti-twist device 30

[0118] 31 Connection flange

[0119] 32a first leg of the sliding part 30a

[0120] 32b second leg of the sliding part 30a

[0121] 34 Sliding element

[0122] 34a Marking of the sliding element 34

[0123] 36 terminal housings

[0124] 36a Terminal housing feedthrough 36

[0125] 36b Terminal housing shoulder 36

[0126] 38 support ring

[0127] 40 screw

[0128] 42 Adjustment device

[0129] 44a first wedge ring

[0130] 44b second wedge ring

[0131] 46 first clamping module

[0132] 46a first sub-module of the first clamping module 46

[0133] 46b second sub-module of the first clamping module 46

[0134] 48 second clamping module

[0135] 48a first sub-module of the second clamping module 48

[0136] 48b second sub-module of the second clamping module 48

[0137] 50 power transmission element

[0138] 52 connecting screw

Claims

P a t e n t a n s p r ü c h e 1 . Actuating device (10) for a process plant, comprising an actuator (12) with an actuating rod (12a) mounted axially movably in the actuator (12), a control valve (16) with a valve housing (16f) in which an axially movable valve rod (16a) connected to a valve member is mounted, and a connecting housing (14) which connects the actuator (12) and the control valve (16) to one another, wherein the actuating rod (12a) and the valve rod (16a) are designed to transmit a driving force of the actuator (12) to the valve member, are connected to one another via at least one rod coupling (24b) and form a rod transmission (27), and an anti-twist device (30) with a clamping part (30a) and a sliding part (30b) is provided, wherein the clamping part (30a) is fastened to the rod transmission (27) by radially acting clamping and the sliding part (30b) is fixed to the connecting housing (14),thereby preventing rotation of the rod transmission and during a lifting movement of the actuator (12) and thus of the rod transmission (27), the sliding part (30b) slides along the connecting housing (14), the anti-rotation device (30) is designed as a component which is independent of the at least one rod coupling (24b), separate and detachable from the rod transmission (27), characterized in that the clamping part (30a) comprises clamping elements (38, 50, 44a, 44b, 46, 48) which convert an axially introduced force into the radial clamping.

2. Actuator according to claim 1, characterized in that the clamping part (30a) of the anti-twist device (30) is arranged on the rod coupling (24b) and the clamping elements (38, 50, 44a, 44b, 46, 48) rest on the rod coupling (24b).

3. Actuating device according to one of the preceding claims, characterized in that the clamping part (30a) has a clamping housing (36), wherein the clamping elements (38, 50, 44a, 44b, 46, 48) are arranged at least partially in the terminal housing (36).

4. Actuator according to one of the preceding claims, characterized in that the terminal housing (36) has a passage (36a) through which the rod arrangement (27) passes.

5. Actuator according to one of the preceding claims, characterized in that the clamping elements comprise a support ring (38), a force transmission ring (50), a first wedge ring (44a) and a first clamping module (46).

6. Actuator according to claim 5, characterized in that the first clamping module (46) comprises two half rings (46a, 46b) arranged at a distance from one another in the circumferential direction.

7. Actuator according to claim 5 or 6, characterized in that the support ring (38) rests in the axial direction on the force transmission ring (50), the force transmission ring (50) rests on the first wedge ring (44a) and the first wedge ring (44a) rests on the first clamping module (46) in a support area, wherein the first wedge ring (44a) and the first clamping module (46) each have a complementary contour in the support area, wherein the contours are designed such that with axial displacement of the first wedge ring (44a) relative to the clamping module (46) by the axially introduced force effect, the half rings (46a, 46b) are moved radially inwards into the passage (36a).

8. Actuator according to one of the preceding claims, characterized in that the clamping elements have a second wedge ring (44b) and a second clamping module (48), wherein the second clamping module (48) comprises two half rings (48a, 48b) arranged at a distance from one another in the circumferential direction.

9. Actuating device according to claim 8, characterized in that the second wedge ring (44b) rests on one side in the axial direction on the first clamping module (46) and on the other side on the second clamping module (48), wherein the second clamping module (48) rests on the other side on a shoulder (36b) of the clamping housing (36), wherein the second wedge ring (44b) and the second clamping module (48) each have a complementary contour in the support area, so that due to the axially introduced force, the first clamping module (46) displaces the second wedge ring (44b) in the axial direction and the half rings (48a, 48b) are moved radially inwards into the passage (36a).

10. Actuating device according to claims 7 or 9, characterized in that the contour is formed by a wedge shape resulting in section. 11 . Actuator according to one of the preceding claims, characterized in that axial force is introduced into the clamping elements (38, 50, 44a, 44b, 46, 48) by screws (40) acting on the clamping housing (36), wherein the screws (40) interact and are mounted with the support ring (38) and the clamping housing (36) in such a way that when the screws (40) are moved, the axial distance of the support ring (38) from the clamping housing (36) is adjustable.

12. Actuating device according to one of the preceding claims, characterized in that the clamping part (30a) and the sliding part (30b) are detachably connected to one another.

13. Actuating device according to one of the preceding claims, characterized in that the sliding part (30b) is U-shaped, wherein the sliding part (30b) is axially guided on the connecting housing (14), and wherein the sliding part (30b) has a plurality of sliding elements (34) with which the sliding part (30b) is guided on a guide of the connecting housing (14).

14. Actuating device according to claim 13, characterized in that the sliding elements (34) are arranged on both outer sides of the respective legs (32a, 32b) of the U-shape.

15. Actuator according to claim 13 or 14, characterized in that the sliding elements (34) are arranged one above the other in the axial direction in the sliding part (30b).

16. Actuator according to one of claims 13 to 15, characterized in that the guide of the connecting housing (14) is made of metal and the sliding elements (34) are made of plastic.

17. Actuator according to claim 16, characterized in that the sliding elements (34) have markings (34a) in order to detect the friction with the guide To indicate wear of the sliding elements (34).

18. Actuator according to one of the preceding claims, characterized in that the rod transmission (27) has an adjusting rod (26) and a further rod coupling (24a), wherein the drive rod (12a) is coaxially connected to a first end of the adjusting rod (26) by means of the first rod coupling (24a), wherein the free end of the valve rod (16a) is coaxially connected to the second end of the adjusting rod (26) by the second rod coupling (24b).

19. Actuator according to claim 18, characterized in that the clamping part of the anti-rotation device (30) is arranged on the second rod coupling (24b) and the clamping elements rest on the second rod coupling (24b).

20. Actuator according to claim 19, characterized in that the connecting housing (14) is formed with a first housing part (18) and a second housing part (20), the second housing part (20) is formed by several connecting rods (20a), and the guide for the anti-twist device (30) and the anti-twist device (30) is arranged in the second housing part (20). 21 . Actuator according to claim 20, characterized in that the guide is formed between two adjacent connecting rods (20a).

22. Actuator according to one of claims 20 or 21, characterized in that the second housing part (20) has a connecting flange (31), wherein the connecting flange (31) is connected to the control valve (16) on one side and to the connecting rods (20a) on the other side.

23. Actuator according to claim 22, characterized in that the connecting rods (20a) are detachably connected to the first housing part (18) and the connecting flange (31).

24. Actuating device according to one of claims 18 to 23, characterized in that the second rod coupling (24b) has an adjusting device (42), wherein the axial distance between the valve rod (16a) and the adjusting rod (26) can be adjusted.

25. Actuating device according to claim 24, characterized in that the adjusting device (42) has a first and a second side, wherein a right-hand thread is formed on the first side and a left-hand thread is formed on the second side, wherein the adjusting rod (26) or the Valve rod (16) has a corresponding complementary counter thread at each end.

26. System of an actuating device (10) according to one of the preceding claims, characterized by a plurality of second housing parts (20) of different lengths, a plurality of differently designed actuators (12) and / or control valves (16), and a plurality of differently designed adjusting rods (26).

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