Control valve and use of a control valve

Abstract

A pressure control valve (10) is provided for controlling process parameters in a system, having a valve spindle (18), which can be moved between an open position and a closed position, for opening, closing, and controlling a fluidic connection between an inlet (22) and at least one outlet (26) for a medium (12), a valve seat (16), which forms the inlet (22), for bearing sealingly against the valve spindle (18) in the closed position, and at least one sensor (32) for detecting a process parameter, each sensor (32) being positioned within the valve spindle (18), within the valve seat (16), or within a valve wall of a housing (14). By positioning the sensor (32) in the valve seat (16) or in the valve spindle (18), process parameters which can be influenced by the pressure control valve (10) can be measured directly, more precisely, and more quickly, whereby a good control of a system is made possible with the aid of a pressure control valve (10).

Description

[0001] 240265P10WÖ

[0002] - 1 -

[0003] Control valve and use of a control valve

[0004] Description

[0005] The invention relates to a control valve, in particular a high-pressure control valve for applications in a pressure range above 200 bar or above 1500 bar, with the aid of which a pressure or flow rate can be controlled in high-pressure process engineering plants, and to the use of such a control valve.

[0006] From DE 10 2014 212 001 Al, a pressure control valve for injecting fuel into a gasoline or diesel engine of a motor vehicle is known, in which a valve spindle, which is in a closed position against a valve seat, can be moved via an intermediate space towards a housing cover into an open position. The valve spindle has a central through-bore, while the housing cover has an opening which, on its outer side facing away from the valve seat, is closed by a pressure sensor, so that the fuel pressure can act on the pressure sensor via the through-bore of the valve spindle, through the intermediate space and the opening, in order to measure the fuel pressure.

[0007] There is a constant need to be able to control the process parameters of a system as precisely as possible using a control valve.

[0008] The purpose of the invention is to demonstrate measures that enable good control of a system using a control valve.

[0009] The problem is solved by a control valve having the features of claim 1 and a use having the features of claim 10. Preferred embodiments 240265P10WÖ

[0010] - 2 - are specified in the dependent claims and the following description, each of which, individually or in combination, can represent an aspect of the invention, the scope of protection being determined by the claims. If a feature is presented in combination with another feature, this serves only to simplify the presentation of the invention and is in no way intended to imply that this feature cannot also be a further development of the invention without the other feature.

[0011] One aspect of the invention relates to a control valve, in particular a pressure control valve, for controlling process parameters in a system, comprising a valve spindle that can be moved between an open position and a closed position for opening, closing and controlling a fluidic connection between an inlet and at least one outlet for a medium, a valve seat forming the inlet for sealing contact with the valve spindle in the closed position and at least one sensor for detecting a process parameter, wherein the respective sensor is positioned within the valve spindle or within the valve seat or within a valve wall of a housing.

[0012] During operation of the control valve, the valve seat and the valve spindle interact directly to open and close the control valve. The valve spindle, in particular, can also assume intermediate positions between the closed and fully open positions. The mass flow or volume flow of the medium that can be discharged from the inlet to the outlet via the control valve can be regulated by the relative position of the valve spindle to the valve seat and / or the duration of the closed and open positions within a time interval. This makes it possible, in particular, to regulate the pressure and / or temperature of the remaining medium that is not discharged. The relevant process parameters can be measured by at least one sensor, and preferably several sensors can be provided for measuring different process parameters.

[0013] Since at least one sensor is located within the valve seat or within the valve spindle, and in particular is positioned completely embedded within the material of the valve seat or the valve spindle, it is possible to measure the respective process parameter and / or thermal and / or mechanical loads as close as possible to a flow gap forming between the valve seat and the valve spindle. The process parameter can thus be measured precisely where it is directly influenced by the position of the control valve, for example, to measure a pressure drop.Compared to a measuring point located further upstream or downstream of the flow gap between the valve seat and the valve spindle, a time lag between the measured value of the process parameter and the conditions present in the flow gap can be avoided. This enables more stable control, as unnecessary dead time elements in the control system are eliminated. Furthermore, changes in the measured value of the process parameter occurring between the measuring point and the flow gap can be avoided, since the process parameter can be measured more directly at the flow gap between the valve seat and the valve spindle. Changes in flow behavior due to wear, e.g., of the spindle, can also be detected.This approach leverages the fact that high-pressure control valves are designed for extreme loads or even significantly over-engineered, making it possible to integrate the sensor within the valve seat or spindle. In fact, by selecting appropriate materials, alloys, and / or hardening processes, it is easily possible to make the valve seat and / or spindle particularly robust for the specific application, thus ensuring a sufficiently high stability reserve for accommodating the sensor within the valve seat or spindle. Furthermore, this can even improve the wear resistance and durability of the valve seat and spindle, despite the fact that a portion of the otherwise intended volume of the valve seat and / or spindle is used for sensor placement.By positioning the sensor in the valve seat or in the valve spindle, the measurement of... The process parameters that can be influenced by the control valve can be adjusted more directly, accurately and quickly, thus enabling good control of a system using a control valve.

[0014] The valve seat of the control valve can be rigidly and tightly connected to the valve housing. The valve seat can be penetrated by the inlet of the control valve and may define the inlet. Preferably, the valve seat forms a contact surface for the valve spindle, in particular a tip of the valve spindle, so that the inlet can be sealed by the valve spindle when the valve spindle bears against the contact surface of the valve seat in a line or, preferably, over a surface. For this purpose, the inlet of the valve seat can be conically countersunk on the side facing the valve spindle and / or have a chamfer. The valve seat can be connected to a medium-carrying line directly or indirectly via a connection nipple on the side facing away from the valve spindle, allowing fluid communication.In the closed position of the control valve, the medium can accumulate at the inlet and, apart from any leakage flows that may occur, cannot pass through it. In the partially or fully open position of the control valve, the medium can enter the control valve housing via the flow gap that forms between the valve seat and the valve stem and be discharged from the housing through the at least one outlet. The valve seat can be sealed to the housing via a separate, medium-tight seal or can itself act as a lens seal between the housing and the connection nipple, provided the material properties of the valve seat permit. Preferably, the valve seat is at least partially recessed in the control valve housing so that the housing can support and stabilize the valve seat radially.

[0015] The valve spindle can have a tip that interacts with the valve seat and / or a shaft that interacts with a drive unit. The valve spindle can be moved by means of the drive unit, in particular by linear displacement in the axial direction.

[0016] Preferably, the valve spindle can be positioned in an intermediate position between a fully open and a fully closed position, for example, to control the flow gap between the valve seat and the spindle. With the aid of the drive unit and / or a spring element, the valve spindle can be pressed against the valve seat to seal the inlet. Preferably, the valve spindle has a conical end section that can be partially inserted into the inlet. In the open position of the valve spindle, it can provide a fluidic connection between the inlet and the outlet, particularly via an annular chamber formed in the housing. Preferably, the valve spindle is mounted and / or sealed and driven in an axial area extending away from the valve seat and beyond the annular chamber.An actuating force for displacing the valve spindle can be introduced in an end region of the valve spindle pointing away from the valve seat.

[0017] The medium flowing through the control valve in the open position can be liquid and / or gaseous and / or supercritical. In particular, the medium is a liquid, a gas, or a mixture, especially an aerosol or a dispersed liquid. The medium can be flammable or even explosive. For example, the medium contains ethylene, CO2, ammonium carbamate, or urea. The medium can have an operating pressure of over 200 bar, over 1500 bar, or over 2500 bar and / or an operating temperature of 50°C to 450°C, preferably from 100°C to 400°C.

[0018] The sensor is designed to detect the respective process parameter, in particular temperature and / or pressure, using a suitable measuring principle. Preferably, the measuring principle is non-contact and / or can be derived from measurable properties of the material of the valve seat and / or the valve spindle. For example, the temperature of the medium can be measured using a sensor designed as a temperature sensor, which measures the temperature of the valve seat and / or the valve spindle. The sensor correlates sufficiently strongly with the temperature of the medium via heat conduction effects, whereby measurement errors and / or delays can be minimized due to the very short heat conduction path between the sensor and the medium. The sensor is, for example, battery-operated and / or can transmit its measurement signal to a receiver without contact. However, it is also possible to operate the sensor via wires, especially cables, whereby the sensor can receive electrical energy for operation via the wires and / or send and / or receive signals.

[0019] In particular, the valve seat has a first receiving chamber for receiving the sensor, formed within an outer diameter of the valve seat and outside an inner surface of the valve seat that defines the inlet, and / or the valve spindle has a second receiving chamber for receiving the sensor, formed within an outer cylindrical surface, wherein the sensor is fixedly attached to a chamber wall that defines the receiving chamber. The receiving chamber can be a cavity formed in the valve seat and / or in the valve spindle, which is, for example, designed as a recess in an otherwise rotationally symmetrical section. The first receiving chamber of the valve seat is bounded by a chamber wall, particularly in the tangential and axial directions. Preferably, the first receiving chamber is accessible to the sensor in the radial direction, preferably from the radial outside.The second receiving chamber of the valve spindle can also be bounded tangentially and axially by a chamber wall, with sufficient accessibility provided. Preferably, the second receiving chamber of the valve spindle is formed by an axially extending recess, in particular a central blind hole, such that the second receiving chamber is bounded circumferentially and on a front axial side facing the valve seat by the chamber wall, wherein the second receiving chamber is accessible to the sensor on a rear axial side facing away from the valve seat. The sensor can be inserted into the respective receiving chamber from the accessible side and within the...

[0020] The receiving chamber must be positioned at a designated location. If necessary, any remaining cavity in the receiving chamber can be filled with a filler material, particularly a non-conductive one, such as a filled resin or adhesive, to at least make it more difficult or even impossible to press in or dent the receiving chamber.

[0021] Preferably, the receiving chamber is closed with a chamber cover, which allows the passage of lines for transmitting electrical energy and / or signals. The chamber cover, which is preferably designed as a separate component, can protect the sensor housed in the receiving chamber from environmental influences and / or prevent the leakage of any filling material. Simultaneously, the chamber cover can have a passage or maintain a passage between the chamber cover and a chamber wall of the receiving chamber. Through this passage, lines, especially cables, can be routed from the interior of the receiving chamber to the outside. This allows the sensor to be easily and continuously supplied with electrical energy, and its measurement signals to be transmitted to a control and / or regulation unit with essentially no interference.In particular, it is possible that the chamber cover has different material properties compared to the valve seat and / or the valve stem. It can be taken into account that the chamber cover may be located at a point less stressed by the medium than the rest of the valve seat and / or the rest of the valve stem, so that less stringent material requirements may be imposed on the chamber cover.

[0022] The sensor is particularly preferably coupled to the chamber wall thermally and / or force-transmitting and / or acoustically, especially by direct contact. This coupling allows the sensor to detect and measure pressure stresses and / or vibrations and / or heat in the chamber wall. This utilizes the fact that the pressure and / or temperature of the medium acting on the valve seat and valve spindle affects the

[0023] The material of the valve seat and valve spindle acts upon the sensor. This effect can manifest as temperature and / or material expansion and / or vibration of the chamber wall, which can then be measured by the sensor. With suitable sensor calibration, the sensor can easily measure the respective process parameter, in particular temperature and / or pressure and / or vibration, during operation. Specifically, the designed receiving chamber allows the material thickness in the chamber wall area to be less than outside the receiving chamber, resulting in a particularly small heat conduction path and / or particularly high expansion and / or high vibration in the chamber wall area, which makes measuring temperature and / or pressure particularly easy and accurate.

[0024] In particular, the receiving chamber is produced by machining, especially drilling and / or milling. Compared to a conventional forming of the receiving chamber, the dimensions of the receiving chamber can be adapted with high precision to the shape of the at least one sensor and / or form a contact surface with the sensor with a high surface finish. Preferably, the receiving chamber is machined before any hardening and / or surface treatment and / or coating of the valve seat and / or the valve spindle is carried out.

[0025] Preferably, more than one sensor is provided in the same receiving chamber. For example, two, three, four, five, six, or even more sensors are provided in the same receiving chamber, wherein the sensors measure at least partially the same or different process parameters. Alternatively, exactly one receiving chamber can be provided for exactly one sensor. It is possible to provide all sensors in a common receiving chamber, to provide each sensor individually in a dedicated receiving chamber, or to provide some of the sensors in a common receiving chamber and, for the remaining sensors, each sensor in a separate receiving chamber. to provide a separate acquisition chamber. For example, redundant measurement of the same process parameter can be provided. The same measurement value can also be measured at different locations, for example, to measure a temperature profile along a chamber wall of the acquisition chamber, making it possible to consider dynamic and / or spatially distributed changes of a specific measurement value during evaluation. Furthermore, it is possible to combine sensors based on different measurement principles and / or sensors measuring different process parameters in a common acquisition chamber, thereby minimizing manufacturing and production costs.

[0026] Preferably, the sensor is separated from the medium by a material of the valve seat, valve stem, or valve wall of the housing. For example, a chamber wall of the receiving chamber can provide physical separation of the sensor from the medium, so that the sensor can be protected from the medium by being housed in the valve seat or valve stem. This can improve the durability of the sensor.

[0027] Additionally or alternatively, the valve seat and / or the valve stem and / or the valve housing wall can have a measuring port that communicates with the medium and is sealed by the sensor. This allows the sensor located at the measuring port to directly measure a process parameter of the medium without the material of the valve seat or valve stem interfering with the measurement. If more than one sensor is used, it is also possible for one sensor to be located separately from the medium within the valve seat or valve stem, while the other sensor is directly exposed to the medium via the measuring port.

[0028] In particular, the respective sensor is a temperature sensor, a strain sensor, a

[0029] Pressure sensor, an accelerometer, a vibration sensor, an ultrasonic sensor, a 240265P10WÖ

[0030] - 10 -

[0031] A gas detection sensor or an explosion sensor can be used to measure various process parameters. For example, the sensor can be a bimetal strip, a thermocouple, a surface acoustic wave sensor, or a wire loop to measure temperature. To measure pressure, the sensor can be a strain gauge, piezoelectric sensor, surface acoustic wave sensor, optical fiber, or pressure-sensing membrane. Preferably, the sensor can detect a calibrated measurement value. Particularly when detecting an explosion and / or decomposition, it is sufficient to measure a sudden change in pressure and / or temperature, without requiring a precise measurement. For example, the sensor can be designed as a fusible link where, above a certain temperature threshold, a sensor material melts, thereby detecting that the threshold has been exceeded.By measuring accelerations and / or vibrations with the sensor, pressure pulsations amplified by resonance or caused by chemical reactions can be detected. These pulsations can then be quickly and effectively dampened by a suitable, short-term adjustment of the control valve's opening degree. If a chemical reaction of the medium occurs, particularly decomposition, this can lead to high-frequency vibrations and / or noise. These vibrations can be detected inside the control valve using the appropriate sensor and quickly and effectively dampened by a suitable, short-term adjustment of the control valve's opening degree.With the aid of the ultrasonic sensor, in particular the material thickness of the valve seat and / or the valve spindle can be measured, preferably in the area of ​​the flow gap resulting in the open position, thereby enabling precise wear measurement for the control valve.

[0032] Another aspect of the invention relates to the use of a control valve, which can be designed and further developed as described above, for controlling at least one process parameter in a process plant, in particular for the production of urea, low-density polyethylene (LDPE) or ethylene vinyl acetate (EVA), Preferably at an operating pressure above 200 bar, above 1500 bar, or above 2500 bar, and / or at an operating temperature of 50°C to 450°C, preferably 100°C to 400°C, and preferably with a flammable, explosive, and / or corrosive medium. By positioning the sensor in the valve seat or valve spindle, the measurement of process parameters influenced by the control valve can be performed more directly, accurately, and quickly, thus enabling effective control of a system using a control valve even under extreme operating conditions.

[0033] The invention is explained below by way of example with reference to the accompanying drawings and preferred embodiments, wherein the features shown below can represent an aspect of the invention, either individually or in combination, the scope of protection being defined by the claims. If a feature is shown in combination with another feature in the exemplary drawings and the accompanying description, this serves only to simplify the presentation of the invention and is not intended to imply that this feature cannot also be a further development of the invention without the other feature. The drawings show:

[0034] Fig. 1 : a schematic sectional view of part of a control valve designed as an example of a pressure control valve,

[0035] Fig. 2: a schematic sectional view of a valve seat for the pressure regulating valve from Fig. 1, Fig. 3: a schematic sectional view of a front part of a valve spindle for the pressure regulating valve from Fig. 1,

[0036] Fig. 4: a schematic sectional view of a rear part of a valve spindle for the pressure regulating valve from Fig. 1,

[0037] Fig. 5: a schematic cutaway detail view of an alternative arrangement of a sensor for the pressure control valve from Fig. 1,

[0038] Fig. 6: a schematic cutaway detail view of another alternative arrangement of a sensor for the pressure control valve from Fig. 1,

[0039] Fig. 7: a schematic sectional view of a valve spindle for the pressure regulating valve from Fig. 1,

[0040] Fig. 8: a schematic rear view in axial direction of the valve spindle from Fig. 7, Fig. 9: a schematic cutaway detail view of the valve spindle from Fig. 7 at a first assembly point and

[0041] Fig. 10: a schematic cutaway detail view of the valve spindle from Fig. 9 at a subsequent second assembly time.

[0042] The pressure control valve 10, partially shown in Fig. 1, can be used particularly in process engineering plants at high pressure, high temperature, and with an aggressive medium 12. The pressure control valve 10 has a housing 14 with a valve wall in which a valve seat 16 is fitted in a medium-tight manner. A valve spindle 18 is guided axially displaceably within the housing 14 and can be actuated by a drive unit (not shown) and / or pre-tensioned in an axial direction by a spring unit (not shown). In the closed position shown in Fig. 1, a conical tip 20 of the valve spindle 18 can be inserted into a central inlet 22 of the valve seat 16, sealingly.When the valve spindle 18 is moved away from the valve seat 16 into a partially or fully open position, a flow gap is created between the valve seat 16 and the tip 20 of the valve spindle 18, through which the medium 12 can flow into an annular chamber 24 formed in the housing 14 and from there into an outlet 26.

[0043] As shown in Fig. 2, a first receiving chamber 28 can be provided in a limited circumferential angular range of the valve seat 16, particularly by machining. This chamber can preferably be closed, or more preferably sealed, by means of a chamber cover 30 designed as a separate component. At least one sensor 32 can be provided in the first receiving chamber 28, which is preferably attached directly to a chamber wall 34 facing the inlet 22 in order to be as close as possible to the inlet.

[0044] 22 and as close as possible to the medium 12 process parameters, for example pressure and / or temperature.

[0045] As shown in Fig. 3, analogous to the valve seat 16 shown in Fig. 2, a second receiving chamber 36 can be additionally or alternatively formed in the valve spindle 18, which is accessible, in particular, only on an axial side facing away from the valve seat 16. Optionally, the second receiving chamber 36 can be closed and / or sealed at its accessible axial end by a further chamber cover (not shown), or it may not be. The second receiving chamber 36 can be formed exclusively outside the tip 20 or can extend into the tip 20. The at least one sensor 32, which may be configured, for example, as a temperature sensor, force sensor, acceleration sensor, or strain sensor, can thereby also be positioned particularly close to the inlet 22 and the medium 12. The second receiving chamber 36 can be formed, in particular, by drilling.The second receiving chamber 36 can be arranged centrally or eccentrically to the longitudinal axis of the valve spindle 18. Preferably, several second receiving chambers 36 are provided, in particular each produced by drilling.

[0046] As shown in Fig. 4, the valve spindle 18, particularly at an axial end region 38 extending away from the valve seat 16, can have radially outwardly opening second receiving chambers 36 and / or recesses in which sensors 32, particularly strain gauges, are inserted. These sensors can measure strain in the axial end region 38 of the valve spindle 18 caused by the pressure of the medium 12. The axial end region 38 can be located outside a region stressed by the medium 12 that is sealed against the medium 12, so that the respective sensor inserted in the second receiving chamber 36 does not need to be protected by a chamber cover.

[0047] As shown in Fig. 5, it is possible to provide a sensor opening 40 in the valve seat 16, the valve spindle 18, or the valve wall of the housing 14, which communicates with the receiving chamber 28, 36 and is closed by the sensor 32, so that direct contact between the sensor 32 and the medium 12 is possible. The sensor 32 can detect an explosion or decomposition of the medium, for example, during ethylene decomposition, by simply detecting the sudden exceeding of a limit temperature, without having to determine the exact temperature. This allows for the selection of a particularly robust sensor 32 that is not affected by direct contact with the medium 12 and does not require protection by a chamber wall 34. A pressure sensor can also be inserted, preferably screwed in, into the sensor opening 40.The pressure sensor can have a diaphragm that is directed towards the medium 12 and can detect the pressure of the medium 12.

[0048] As shown in Fig. 6, the sensor 32 can also protrude from the receiving chamber 28, 36 of the valve seat 16 or the valve spindle 18. This can be the case, in particular, if the sensor 32 is designed as an ultrasonic sensor that detects a remaining material thickness 42 and / or an existing wear thickness 44 of the valve seat 16 or the valve spindle 18, preferably in the flow gap. The flow gap represents a particularly stressed area, which is subjected not only to throttling by the flowing medium 12, but also by the sealing pressure of the valve spindle 18 against the valve seat 16.

[0049] As shown in Fig. 7, the valve spindle 18, unlike the embodiment of the valve spindle 18 shown in Fig. 3, can have one or preferably several substantially cylindrical receiving chambers 36, which are produced in particular by drilling. The bore for forming the receiving chamber 36 can For example, they may have a diameter of approximately 2 mm to approximately 3 mm and may, in particular, have a bore depth of approximately 600 mm. In each receiving chamber 18, a sensor 32, preferably exactly one sensor 32 for each receiving chamber 36, can be inserted from a rear axial side 46 pointing away from the valve seat 16. This makes it possible for cables 48 connected to the sensor 32 to be routed out in a low-stress area of ​​the valve spindle 18, while the sensors 32 can be positioned near the tip 20 of the valve spindle 18 or at least partially or completely within the tip 20 of the valve spindle 18.

[0050] As shown in Fig. 8, the multiple cylindrical receiving chambers 36 can be distributed, particularly substantially uniformly, over the cross-section of the valve spindle 18, so that several receiving chambers 36 and several sensors 32 can easily be accommodated in the material of the valve spindle 18. For this purpose, it is possible, for example, to provide one receiving chamber 36 centrally and, for example, two, three, four, or five further receiving chambers 36 on a first radius relative to the central receiving chamber 18, and optionally to provide further receiving chambers 36 on a further radius different from the first radius, and so on. The receiving chambers 36 provided on a common radius can be arranged uniformly distributed in the circumferential direction.

[0051] With reference to Figures 9 and 10, a method for introducing and positioning a sensor 32 within a valve spindle 18 or within a valve seat 16 or within a valve wall of a housing 14 is described below.

[0052] As shown in Fig. 9, the respective sensor 32 can be inserted into the cylindrical receiving chamber 36 with clearance. The sensor 32 can preferably be provided on the outside of an elastic body 50. The elastic body 50 is For example, the elastic body 50 is made of a polymer, in particular silicone, wherein the material of the elastic body 50 is sufficiently temperature-resistant for the intended use, for example up to 450°C. The cable 48 is guided out of the receiving chamber 36 through the elastic body 50. At least the sensor 32, and preferably also the elastic body 50, can be provided with a suitable adhesive for bonding to the chamber wall 34.

[0053] As shown in Fig. 10, for example, a hollow tube 52 can be used to press and compress the elastic body 50 into the receiving chamber 36, thereby pressing the sensor 32 and, if applicable, the elastic body 50 against the chamber wall 34 of the receiving chamber 36 via the adhesive layer. This generates the necessary contact pressure for bonding, allowing the sensor 32 to be firmly bonded to the chamber wall 34 of the receiving chamber 36. The sensor 32 can then be configured, for example, as a strain sensor and measure corresponding strains in the chamber wall 34 via the adhesive layer. Due to the temperature-resistant properties of the elastic body 50, the bonding can be carried out in a heat chamber, or the adhesive bond can be cured in a heat chamber.After the sensor 32 and, if applicable, the elastic body 50 have been glued in place, the hollow tube 52 used to press the elastic body 50 can be removed from the cylindrical receiving chamber 36 or remain in the cylindrical receiving chamber 36 as additional protection, e.g. for the cable 48 and / or as stiffening of the valve spindle 18.

Claims

240265P10WÖ - 1 - P a t e n t a n s p r ü c h e 1. Control valve (10) for controlling process parameters in a system for applications in a pressure range above 200 bar or above 1500 bar, with a valve spindle (18) movable between an open position and a closed position for opening, closing and controlling a fluidic connection between an inlet (22) and at least one outlet (26) for a medium (12), a valve seat (16) forming the inlet (22) for sealing against the valve spindle (18) in the closed position and at least one sensor (32) for detecting a process parameter, characterized in that the respective sensor (32) is positioned inside the valve spindle (18) or inside the valve seat (16) or inside a valve wall of a housing (14),wherein the valve seat (16) has a first receiving chamber (28) formed within an outer diameter of the valve seat (16) and outside an inner surface of the valve seat (16) that defines the inlet (22) for receiving the sensor (32) and / or the valve spindle (18) has a second receiving chamber (36) formed within an outer surface for receiving the sensor (32), wherein the sensor (32) is fixedly attached to a chamber wall (34) that defines the receiving chamber (28, 36) in a manner that prevents movement.

2. Control valve (10) according to claim 1, wherein the receiving chamber (28, 36) is closed with a chamber cover (30), wherein the chamber cover (30) allows the passage of lines for the transmission of electrical energy and / or signals.

3. Control valve (10) according to claim 1 or 2, wherein the sensor (32) is thermally and / or force-transmitting and / or vibration-transmitting coupled to the chamber wall (34).

4. Control valve (10) according to one of claims 1 to 3, wherein the receiving chamber (28, 36) is produced by machining.

5. Control valve (10) according to one of claims 1 to 4, wherein more than one sensor (32) is provided in the same receiving chamber (28, 36).

6. Control valve (10) according to one of claims 1 to 5, wherein the sensor (32) is separated from the medium (12) via a material of the valve seat (16) and / or the valve spindle (18) and / or the valve wall of the housing (14).

7. Control valve (10) according to one of claims 1 to 6, wherein the valve seat (16) and / or the valve spindle (18) and / or the valve wall of the housing (14) has a measuring opening (40) communicating with the medium (12) and closed by the sensor (32).

8. Control valve (10) according to one of claims 1 to 7, wherein the respective sensor (32) is a temperature sensor, a strain sensor, a pressure sensor, an acceleration sensor, a vibration sensor, an ultrasonic sensor, a gas detection sensor or an explosion sensor.

9. Use of a control valve (10) according to one of claims 1 to 8 for controlling at least one process parameter in a process plant for the production of urea, low-density polyethylene (LDPE) or ethylene vinyl acetate (EVA), at an operating pressure of over 200 bar, over 1,500 bar or over 2,500 bar, an operating temperature of 50°C to 450°C, preferably 100°C to 400°C, and a flammable and / or explosive and / or corrosive medium (12).

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