DE102019103176A1 - Butterfly valve, process, fitting body and sealing sleeve - Google Patents

Abstract

A sealing collar (12) is provided for the arrangement between a fitting body (4) of a butterfly valve (2) and a flap (6) which can be rotated relative to the fitting body (4) and which limits the flow of a process fluid, the sealing collar (12) having a sensor arrangement (30 ), and wherein the sensor arrangement (30) is set up to provide at least one signal (S) which characterizes the tightness of the butterfly valve (2) before an internal or external leak occurs.

Description

The invention relates to a butterfly valve, a method, a fitting body and a sealing sleeve for a butterfly valve.

It is known that a lack of tightness in a butterfly valve is recognized, for example, by a visible leak to the outside or process problems caused by an internal leak when the butterfly valve is closed. The lack of tightness of the butterfly valve is often related to a lack of sealing effect of a sealing sleeve.

It is therefore the object of the invention to improve a butterfly valve in such a way that the tightness of the butterfly valve is guaranteed.

The object is achieved by a butterfly valve according to claim 1, a method for operating the butterfly valve according to an independent claim, a fitting body according to a further independent claim, and a sealing collar according to another independent claim.

A first aspect of this description relates to a butterfly valve comprising a fitting body, a flap that can be rotated within the fitting body and restricts a flow of a process fluid, a sealing sleeve which is arranged between the fitting body and the flap, and a sensor arrangement, the sensor arrangement being configured to at least to provide a signal which characterizes the tightness of the butterfly valve before an internal or external leak occurs.

The signal, which characterizes the tightness of the shut-off valve before the internal or external leak occurs, thus depicts changes in the sealing function due to aging or damage to the valve and / or the sealing sleeve. The signal that characterizes the tightness of the butterfly valve is caused by an undesired change in material or arrangement.

Before an internal or external leak occurs, a prediction is made about the probability of the internal or external leak.

An external leak means that the process medium, which is carried in the fluid channel, escapes to the outside. In the event of an internal leak, a smaller or larger amount of process fluid flows although the flap is pressing on the sealing sleeve. The process medium can nevertheless flow between the flap and the sealing sleeve. In the event of an internal leak, the sealing sleeve and the flap thus release an internal leakage space for the flow of the process medium.

With the proposed shut-off valve, preventive measures can be taken even before damage occurs. In this way, targeted maintenance can be carried out. As a result, there are no costs for preventive maintenance. In the case of maintenance triggered by the monitoring, the associated system can be switched off in a targeted manner without an emergency shutdown having to take place. Consequently, the proposed butterfly valve has the advantage that the probability of an external or internal leakage occurring can be greatly reduced.

An advantageous example is characterized in that an indicator characterizing the tightness of the butterfly valve can be determined as a function of the signal provided by the sensor arrangement and as a function of a previously determined characteristic map and / or a previously determined characteristic curve and / or a previously determined target value is.

The materials of the flap and the sealing sleeve as well as their geometries and operating parameters such as pressures, temperatures and the process medium influence the durability and tightness of the butterfly valve. So it is a complex system with many influencing factors. An inward leakage, for example caused by a crack in the sealing sleeve and recognized as an inward leakage, can also affect the outward leakage in the further course of aging of the sealing sleeve. Such developments can be foreseen through the proposed use of the characteristics map and / or the characteristic curve and / or the setpoint value.

The map applied in advance takes into account, for example, age, a number of switching cycles, etc. in the form of further input variables and is determined in advance on the basis of test objects in the laboratory. During operation, the characteristic field is acted upon by the signal from the sensor arrangement in order to detect a deviation from normal operation, for example premature aging and material fatigue.

By taking into account the rotational position of the rotatable flap, it can be clearly concluded whether or not the flap should rest against the sealing collar in the respective rotational position. Consequently, for example, pressure recordings are determined over time when closing the flap and / or when opening the flap. The recorded pressure recording is, for example compared with a setpoint profile of pressures, for example in a characteristic diagram, by subtraction and assigned, in particular, to a tightness value in the form of the indicator via a deviation criterion such as a threshold value for a tightness. The indicator is divided, for example, according to a traffic light system and brought to the attention of the operating personnel. This can then take further maintenance measures based on the assessment of the system.

An advantageous example is characterized in that a shaft sealing section delimits a through opening of the sealing collar for a shaft, the sensor arrangement in the shaft sealing section being set up to provide the signal that characterizes the sealing effect of the sealing collar in the area of the through opening for the shaft. The tightness of the butterfly valve is advantageously monitored from the outside in this way. The sealing sleeve is aged or damaged, for example, due to an increased number of shift changes that have already been carried out. Furthermore, by assessing the shaft section by means of the signal, incorrect installation of the sealing sleeve can be detected. The process medium itself can also damage the sealing sleeve by flowing past at high speed or by suction. By means of the early detection of a fault pattern stored in this way by means of the signal, countermeasures can consequently be initiated even before the process fluid is visible.

An advantageous example is characterized in that the sealing sleeve in the shaft sealing section comprises a plurality of sealing lips, with adjacent one of the sealing lips delimiting a recess, and with the sensor arrangement including at least the recess. A chamber formed by the recess and a shaft sealed in the shaft sealing section is advantageously used for the detection of a reduced tightness to the outside. Process fluid entering the chamber can thus be detected even before process fluid visibly emerges.

An advantageous example is characterized in that the sensor arrangement comprises a fluid sensor which converts contact of the fluid sensor with process fluid into the signal, and wherein the fluid sensor is connected to the recess in a fluid-carrying manner. The sealing lips and at least one of the chambers formed via the recesses are advantageously used to detect a sealing problem in the shaft sealing section.

An advantageous example is characterized in that the sensor arrangement comprises an expansion element, the expansion element expanding upon contact with the process fluid, and wherein a material of the sealing sleeve is arranged between a pressure sensor of the sensor arrangement and the expansion element. The pressure sensor can advantageously be arranged laterally on the seal, which is particularly advantageous for the arrangement of signal lines. The swelling of the expansion element advantageously increases its volume, which in turn advantageously increases the sealing tension between the shaft and the sealing collar. In this way, on the one hand, the lack of tightness is recognized and, on the other hand, the risk of leakage is reduced.

An advantageous example is characterized in that a circumferential flap sealing section delimits a seat for the rotatable flap, and the sensor arrangement is at least partially arranged within the flap sealing section or between the flap sealing section and the fitting body. The tightness inward between the flap and the sealing section can thus advantageously be monitored. This advantageously increases process reliability. Other measuring points and measuring devices for monitoring process safety can thus be omitted. In addition, statements about the tightness to the outside can also be made if, for example, there is a crack in the sealing sleeve and this is detected via the signal from the sensor arrangement.

An advantageous example is characterized in that the sensor arrangement comprises a plurality of successive and / or overlapping sensor sections in the circumferential direction, the sensor sections being set up to provide at least one signal in each case, which indicates the tightness of the shut-off valve ( 2 ) characterized before an internal or external leak occurs. The segmentation advantageously determines a damage pattern along the circumference of the sealing sleeve. In this way, a distinction can be made, for example, between a jammed disruptive body, cracks in the seat or uniform wear phenomena along the circumferential direction.

One advantageous example is characterized in that the sensor arrangement comprises a plurality of optically or electrically conductive, thread-like elements, and the signal comprises the number of functional thread-like elements. For example, a break in part of the thread-like elements can advantageously be determined. This break is caused, for example, by an increased exertion of pressure on the flap sealing section. Consequently, a sufficient or insufficient sealing effect is indicated by means of the thread-like elements.

An advantageous example is characterized in that the sensor arrangement comprises a plurality of electrically conductive layers that are electrically insulated from one another and run at least in sections in the circumferential direction, and the signal comprises an electrical capacitance of the plurality of layers. By measuring the electrical capacitance between the two layers, conclusions can be drawn that the sealing effect has changed. A capacity increased over time, for example, indicates a contraction of the material, perpendicular to the course of the layers.

One advantageous example is characterized in that the sensor arrangement comprises an electrically conductive, galvanically non-connected layer and an inductive element running at a distance from the galvanically non-connected layer, and wherein the signal comprises the electrical inductance of the inductive element. The galvanically not connected layer advantageously provides an inductive load. The inductive element induces eddy currents in the electrically unconnected layer, which in turn is reflected in the measurable inductance of the inductive element. As a result, changes in the sealing sleeve that occur perpendicular to the course of the inductive element or the galvanically unconnected layer can be detected.

An advantageous example is characterized in that the material of the sealing collar encloses at least part of the sensor arrangement. The elements of the sensor arrangement are advantageously embedded where a force is exerted on the sealing sleeve during operation. In addition, the sensor arrangement within the material is protected from damage.

A second aspect of this description relates to a method for operating a butterfly valve comprising a fitting body, a flap that can be rotated within the fitting body and restricts a flow of a process fluid, a sealing sleeve which is arranged between the fitting body and the flap, and a sensor arrangement, the sensor arrangement at least provides a signal which characterizes the tightness of the butterfly valve before an internal or external leak occurs.

Another aspect of this description relates to a fitting body for a butterfly valve comprising a sensor arrangement which is designed to provide at least one signal which characterizes the tightness of the butterfly valve before an internal or external leak occurs.

Another aspect of this description relates to a sealing sleeve for a butterfly valve comprising a sensor arrangement which is set up to provide at least one signal which characterizes the tightness of the butterfly valve before an internal or external leak occurs.

• 1, 14, 15 und 16 jeweils ein Absperrklappenventil in einem schematischen Schnitt;
• 2-7 jeweils einen Wellendichtabschnitt einer Dichtmanschette;
• 8a und 8b jeweils ein Beispiel des Absperrklappenventils in einem schematischen Schnitt gemäß 1;
• 9-13 jeweils einen Klappendichtabschnitt der Dichtmanschette.

Further advantages and features can be found in the following description of exemplary embodiments, the same reference numerals also being used in different exemplary embodiments without explicit reference to this being made again. In the drawing show:

• 1 , 14th , 15th and 16 each a butterfly valve in a schematic section;
• 2-7 in each case a shaft sealing section of a sealing sleeve;
• 8a and 8b an example of the butterfly valve in a schematic section according to FIG 1 ;
• 9-13 each a flap sealing section of the sealing collar.

1 shows a soft-seated butterfly valve 2 in a schematic section. The butterfly valve 2 includes a fitting body 4th in which a rotatable flap 6 is arranged to limit a flow of a process fluid. The flap 6 is around an axis of rotation 8th rotatably arranged and is driven by a drive 10 driven. The drive 10 is for example an electric motor or pneumatic drive. In another example is the drive 10 manually driven and includes a manual override. The fitting body 4th provides an inner connection area for an elastic sealing sleeve 12th ready. The elastic sealing cuff 12th comprises an elastic material such as a vulcanized elastomer. The fitting body 4th and the flap 6 are made of a metal alloy, for example. The sealing sleeve 12th includes a proximal seat 14th to rest against the rotatable flap 6 . The seat 14th is by a circumferential flap sealing section of the sealing collar 12th provided. A respective wave 16 , 18th rotates with the flap 6 connected and to the fitting body 4th rotatably mounted. The wave 18th is with the drive 10 connected. The sealing sleeve 12th includes in a shaft seal section 20th , 22nd a respective through opening for the shaft 16 , 18th . The flap 6 is inclined in the state shown and does not lie on the seat 14th at what the flap 6 and the seat 14th Cross-sections 24 and 26th release through which the process fluid can flow. Will the flap 6 twisted and on the seat 14th pushed open, the butterfly valve is 2 locked.

The sealing sleeve 12th comprises a sensor arrangement 30th which is set up to determine at least one signal S. The signal S characterizes a sealing effect of the sealing sleeve 12th . The sealing effect of the sealing sleeve 12th is achieved, for example, by an available elasticity of the material of the sealing collar 12th characterized. The elasticity is determined, for example, in the circumferential direction and / or in the radial direction, starting from an imaginary central axis 28 the sealing sleeve 12th and / or parallel to the central axis 28 measured. In a further example, the sealing effect of the sealing collar 12th due to an expansion of the material in the sealing sleeve 12th characterized. The material expansion is, for example, in the circumferential direction and / or in the radial direction, starting from the imaginary central axis 28 and / or parallel to the central axis 28 measured. Furthermore, the sealing effect of the sealing collar 12th about the presence of process fluid in certain areas of the sealing sleeve 12th characterized. Furthermore, the sealing effect of the sealing collar 12th in a further example by one in the circumferential direction and / or in the radial direction and / or parallel to the central axis 28 occurring pressure on the material of the sealing sleeve characterized. The sealing effect of the sealing sleeve 12th is characterized in particular by the following information: volume reduction due to shrinkage of the material, volume reduction due to swelling of the material, abrasive damage due to material loss, leakage to the outside due to changes in sealing contact points, crack-like damage, material structure changes, material structure changes.

The signal S is for example by means of a measuring element which is part of the sealing cuff 12th is provided. In another example, the signal S is generated by a control unit 32 or one away from the sealing collar 12th arranged measuring element determined.

The signal S is sent to the control unit 32 transmitted. The control unit 32 comprises a memory M and a processor P, a computer program C being stored in the memory M, which executes the method explained in this description. For example, the control unit determines 32 as a function of the signal S an indicator I, which characterizes the sealing effect of the sealing sleeve. The indicator I can include the signal S or the indicator I is derived from the signal S and shows a sufficient or inadequate sealing effect of the sealing sleeve 12th on. The indicator I made available can be transmitted, for example, to remotely located network units in order to take countermeasures against the insufficient sealing effect of the sealing sleeve 12th initiate. In this way, an order process from the manufacturer of the sealing sleeve 12th be triggered and / or measures are being prepared to replace the sealing sleeve 12th perform.

The control unit 32 transmits a signal 34 to set a turning position 36 the flap 6 . In one example, the control unit determines 32 the provided indicator I as a function of the signal S of the sensor arrangement 30th the sealing sleeve 12th and depending on the rotational position 36 the flap 6 . For example, one at the turning position 36 predetermined target pressure on the seat 14th with an actual pressure, which is represented by the signal S, compared. If a deviation between the setpoint pressure and the actual pressure exceeds a threshold value determined in advance, then the indicator I shows a lack of sealing effect of the sealing sleeve 12th on.

2 shows an example of the shaft sealing section 22nd the sealing sleeve 12th out 1 in a schematic section. The opening for the shaft 18th is made by sealing lips 202 , 204 and 206 limited, the distal ends of which are circular on the shaft 18th and provide the sealing effect to the outside. The sealing lips 202 , 204 and 206 are circular and delimit a respective circular recess 208 and 210 . The recesses 208 and 210 limit with the wave 18th a respective chamber which does not receive any process fluid in an operating state without leakage. The sensor arrangement 30th is at least partially in the material of the sealing sleeve 12th arranged.

3 shows an example of the shaft sealing section 22nd the sealing sleeve 12th out 1 in a schematic section. The sensor arrangement 30th includes one in the proximal recess 210 arranged expansion element 302 , which absorbs the process fluid when it comes into contact and expands with it. So if process fluid enters the proximal chamber of the proximal recess 210 one, so takes the expansion element 302 the process fluid, expands and exerts a pressure on the shaft 18th and the material of the sealing sleeve 12th out. The expansion element 302 is arranged, for example, in only one sector of the annular chamber, with fluid entering the chamber leading to the expansion element 302 flows. The one from the expansion element 302 pressure built up is measured by a pressure sensor 304 , which between the material of the sealing sleeve 12th and the fitting body 4th Is arranged biased, determined and provided as the signal S. The sensor arrangement 30th thus includes the recess 210 , the expansion element 302 and the pressure sensor 304 . By preloading the pressure sensor 304 it is achieved that not only an expansion of the expansion element 302 but also a decrease in pressure and thus a loss of the through the sealing sleeve 12th provided contact voltage in the area of the shaft sealing section 22nd is detectable.

4th shows an example of the shaft sealing section 22nd the sealing sleeve 12th out 1 in a schematic section. The sensor arrangement 30th includes the recess 210 , a fluid channel 402 and a fluid sensor 404 , which provides the signal S. The fluid channel 402 is due to the material of the sealing sleeve 12th guided and connects the recess 210 and the fluid sensor 404 fluid-carrying.

5 shows an example of the shaft sealing section 22nd the sealing sleeve 12th out 1 in a schematic section. The sensor arrangement 30th includes the fluid sensor 404 which in contrast to 4th within the material of the sealing sleeve 12th is arranged. This is the fluid sensor 404 and the proximal chamber of the proximal recess 210 fluidly connected to one another.

6 shows an example of the shaft sealing section 22nd the sealing sleeve 12th out 1 in a schematic section. The sensor arrangement 30th comprises a pressure-sensitive resistive layer 602 and a measuring element 604 . One in a radial direction to a center axis of the shaft 18th in the material of the sealing sleeve 12th Occurring pressure causes a change in resistance in the resistance layer 602 , the electrical resistance by means of the measuring element 604 when the signal S is detected. The resistance layer 602 runs parallel to the center axis of the shaft 18th .

7th shows an example of the shaft sealing section 22nd the sealing sleeve 12th out 1 in a schematic section. The sensor arrangement 30th comprises two mutually electrically isolated and electrically conductive layers 702 and 704 as well as a measuring element 706 . The one in the radial direction to the central axis of the shaft 18th in the material of the sealing sleeve 12th occurring pressure causes a relative movement of the layers 702 and 704 to each other. The measuring element 706 determines an electrical capacitance of the two electrically conductive layers 702 and 704 in the form of the signal S. The layers 702 , 704 run parallel to the central axis of the shaft, for example 18th .

If reference is made in this description to a layer embedded in the material of the sealing collar, then in addition to a flat expression of the layer, a thread-like, cylindrical or network-like expression of the layer is also to be understood. Of course, other forms of the respective layer are conceivable.

8a shows the butterfly valve 2 in a section AA 1 . The fitting body 4th provides a proximal connection contour 802 ready. A distal connection contour of the sealing cuff 12th corresponds to the connection contour 802 of the valve body 4th to the sealing sleeve 12th to the fitting body 4th to be determined. The proximal connection contour 802 represents a proximal surface 804 ready to which the sealing collar 12th with the seat 14th opposite area of the flap sealing section 806 is applied. In the present case, the sealing collar represents 12th Undercuts ready in which lateral protrusions 808 and 810 the connection contour 802 intervention.

Press the rotating flap 6 on the seat 14th , the sealing sleeve is in the area of the flap sealing section 806 on the surface 804 pressed. The sensor arrangement 30th is at least partly in the flap sealing section 806 arranged. The sealing sleeve 12th determined by means of the sensor arrangement 30th a signal S, which, for example, a pressure or an expansion of the material of the sealing sleeve 12th in the radial direction to the central axis 28 characterized. In one example, the sensor assembly extends 30th in the circumferential direction, at least in segments, along the in the jacket of the sealing collar 12th circumferential flap sealing section 806 . In another example is the sensor arrangement 30th divided into a plurality of consecutive and / or overlapping sensor sections, the sensor sections extending in the circumferential direction of the sealing collar 12th extend. For example, the sensor arrangement follows 30th in the flap sealing section 806 at least in sections a circular cylindrical course. The division of the sensor arrangement 30th in circular cylinder segments allows the recording of damage patterns, which can be different in the circumferential direction. As a result, a distinction can be made, for example, between wear that occurs uniformly in the circumferential direction and at large time intervals, and a jammed disruptive body which only causes a disturbance in a segment of a circle within a short period of time.

8b indicates based on 8a another example of the butterfly valve 2 . In contrast to 8a is in 8b the sensor arrangement 30th not in the material of the sealing sleeve 12th arranged. Rather, it is the sensor arrangement 30th between the flap sealing section 806 the sealing sleeve 12th and the proximal connection contour 802 of the valve body 4th arranged. The sensor arrangement 30th extends at least in sections in a circular ring between the fitting body 4th and the sealing sleeve 12th .

The sensor arrangement 30th comprises a plurality of sensor sections 830a , 830b , where adjacent one of the sensor sections 830a , 830b overlap or are spaced apart from one another in the circumferential direction. A respective one of the sensor sections 830a , 830b lies radially outward on the proximal surface 804 and lies radially inward on an outwardly facing surface of the sealing sleeve 12th on. A respective one of the sensor sections 830a , 830b provides a respective sensor signal Sa, Sb. The sensor signals Sa, Sb represent, for example, a respective pressure that is in the radial direction of the sealing collar 12th on the respective sensor section 830a , 830b is applied.

The sensor sections 830a , 830b are designed, for example, as one or more pressure measurement foils. The at least one pressure measuring film is attached to the fitting body, for example 4th firmly connected, which has the advantage that the sealing sleeve 12th without exchanging the sensor arrangement 30th goes hand in hand. This has advantages in terms of the cost of the sealing sleeve 12th and nevertheless the sealing sleeve 12th monitored when installed. In addition, the definition of the sensor sections 830a , 830b advantageous in terms of cable routing. For example, the pressure measuring film is in the fitting body 4th glued in.

In another example, the pressure measuring film is firmly attached to the sealing cuff 12th connected. For example, the pressure measuring film can be placed in the sealing cuff 12th or glued in or glued onto them. In one example, the at least one pressure measuring film is formed into a measuring cuff, not shown, which is located between the sealing cuff 12th and the fitting body 4th is arranged.

In another example is the sensor arrangement 30th designed so that this is wholly or partially in a recess of the fitting body 4th and / or in a recess in the sealing collar 12th located to such between the fitting body 4th and the sealing sleeve 12th to be arranged.

9 shows the sealing collar 12th in schematic form analogous to part of section AA 1 . The flap sealing section 806 comprises a pressure-sensitive resistive layer 902 as part of the sensor assembly 30th , which is formed at least as a cylinder jacket segment through the flap sealing section 806 runs. The resistance layer 902 represents depending on the pressure exerted on it in relation to the central axis of the sealing collar 12th radial direction ready an electrical resistance. The electrical resistance of the resistance layer 902 is by means of a measuring element 906 the sensor arrangement 30th provided as the signal S.

10 shows the sealing collar 12th in schematic form analogous to part of section AA 1 . In contrast to 9 are two electrically isolated layers 1004 such as 1006 into the material of the sealing sleeve 12th embedded. An electrical capacitance of the two layers 1004 and 1006 is by means of a measuring element 1008 provided as the signal S. According to a double arrow 2002 affects a relative distance between the two layers 1004 and 1006 to each other in the radial direction to the center axis of the sealing collar 12th on the determined electrical capacitance.

11 shows the sealing collar 12th in schematic form analogous to part of section AA 1 . The sensor arrangement comprises two electrically conductive layers that are electrically insulated from one another 1102 and 1104 . In contrast to the 10 causes a change in a distance between the layers 1102 and 1104 parallel to the center axis of the sealing collar 12th a change in an electrical capacitance of the two layers 1102 and 1104 . The direction parallel to the central axis of the sealing collar 12th is according to a double arrow 1108 shown. A measuring element 1110 determines the electrical capacitance in the form of the signal S.

12th shows the sealing collar 12th in schematic form analogous to part of section AA 1 . In the material of the sealing sleeve 12th is an electrically conductive, but not galvanically connected layer 1202 arranged. Spaced and electrically isolated from the layer 1202 runs an inductive element 1204 . A measuring element 1206 operates the inductive element 1204 such that eddy currents enter the layer 1202 are coupled. These eddy currents cause inductive feedback into the inductive element 1204 . A change in the distance between the layers 1202 and the inductive element 1204 in the radial direction to the center axis of the sealing collar 12th according to a double arrow 1208 causes a change in the measurable electrical inductance of the inductive element 1204 . The electrical inductance of the inductive element 1204 is with the measuring element 1206 provided as the signal S.

13th shows the sealing collar 12th in schematic form analogous to part of section AA 1 . In the material of the sealing sleeve 12th are thread-like elements 1302 , 1304 , 1306 , 1308 and 1310 embedded, with ends of thread-like elements 1302-1310 with a measuring element 1312 are connected. The Elements 1302-1310 are optically or electrically conductive. The conductivity of the thread-like elements is measured by means of the measuring element 1312 determined. If a number of the conductive elements are broken, the broken ones are the elements 1302-1310 no longer continuously conductive. The number of broken conductive elements 1302-1310 indicates a reduced sealing effect of the sealing sleeve 12th . From a predetermined number of elements that are no longer continuously conductive 1302-1310 determines the measuring element 1312 the signal S in such a way as to reduce the sealing effect of the sealing sleeve 12th to display.

14th indicates based on 1 a sealing sleeve 12th , within which a vibrator 1404 and a vibration receiver 1402 are arranged. Of course, the vibrator can 1404 and the vibration receiver 1402 each also outside the material of the sealing sleeve 12th be arranged on this. The vibration generator 1404 is by means of a signal S2 excited to a vibration, which in the material of the sealing sleeve 12th is coupled. The coupled vibration spreads through the material of the sealing sleeve and reaches the vibration receiver 1402 . The vibration receiver 1402 gives the detected vibration by means of a signal S1 to the control unit 32 further. The vibration generator 1404 and the vibration receiver 1402 are thus spaced apart from one another in the radial direction. In an example not shown there is the passage for the shaft 18th between the vibrator 1404 and the vibration receiver 1402 .

In one example, a first reference value for an oscillation response in terms of the signal S1 with a tight shaft seal section 20th , 22nd recorded and a second reference value for a leaky shaft sealing section 20th , 22nd recorded. For example, an amplitude of a specific frequency is used in a frequency representation of the signal S1 as a vibrational response. A threshold for a leaky shaft seal section 20th , 22nd lies between the first and the second reference value, for example in the middle. Exceeds an actual value of the vibration response of the signal S1 the aforementioned threshold value in the direction of the second reference value, the shaft sealing portion becomes 20th , 22nd rated as leaking. The actual value of the vibration response of the signal S1 thus characterizes the sealing effect of the sealing sleeve 12th outward.

In a further example, a third reference value for the vibration response in terms of the signal S1 with a tight flap sealing section 806 and a fourth reference value for a leaky flap sealing section 806 recorded. For example, a further amplitude of a specific further frequency is used in a frequency representation of the signal S1 as a vibrational response. A threshold value for a leaky valve sealing section 806 lies between the first and the second reference value, for example in the middle. Exceeds the actual value of the vibration response of the signal S1 the aforementioned threshold value in the direction of the second reference value, the flap sealing portion becomes 806 rated as leaking. The actual value of the vibration response of the signal S1 thus characterizes the sealing effect of the sealing sleeve 12th inside.

The example according to FIG 14th both with an elastic sealing cuff 12th as well as a non-elastic and therefore rigid sealing sleeve 12th use.

15th shows the example in a schematic section 8b . It is shown that a plurality of at least four sensor sections 830a to 830d in the circumferential direction between the fitting body 4th and the sealing sleeve 12th extend. Of course, the number of sensor sections can be increased in order to enable better resolution and localization of errors. The sensor sections are in the circumferential direction 830a to 830d spaced from each other and save in particular the areas of the waves 16 and 18th out. Through the introduction between the sealing collar 12th and the fitting body 4th are the pressure sensitive sensor sections 830a to 830d preloaded and deliver, for example, without pressing the flap 4th on the sealing sleeve 12th a pressure signal according to the respective signal Sla to S1d. Of course, the sensor sections 830a to 830d also partially overlap and continue towards the waves 16 , 18th be guided or even span the corresponding shaft sections. Due to the sector-shaped arrangement of the sensor sections 830a to 83 d, a pressure curve in the circumferential direction is determined via the respective signals Sla to S1d. Consequently, through a relative comparison of the pressure conditions in the four areas in which the sensor sections 830a to 830d are arranged, it is determined whether, for example, the sector in which the sensor section 830b is arranged, is noticeable by a particularly high or particularly low pressure. In the case of a particularly high pressure, which is represented by the signal S1b, one in the assigned sector between the flap can be activated 6 and the sealing sleeve 12th jammed foreign bodies are closed. At a particularly low pressure, which is represented by the signal S1b, a decrease in elasticity or damage to the sealing sleeve is indicated 12th or a damaged valve 6 closed.

In another example, in addition to the sensor sections 830a to 830d at least one vibration generator 1500 in the form of a vibration foil between the fitting body 4th and the sealing sleeve 12th introduced or arranged. The vibration generator is activated by means of a signal S1500 1500 excited to a vibration. The fitting body 4th and the sealing sleeve 12th are excited to an oscillation, which is reflected in the signals S1a to S1d. The vibration response determined in this way can also be evaluated by means of a map or characteristic curve determined in advance.

16 shows in a schematic section a further example of the butterfly valve 2 . In the section shown is a test channel 1600 between the fitting body 4th and the sealing sleeve 12th arranged, which releases a flow cross-section. The sealing collar lies behind and in front of the drawing plane 12th on the valve body 4th on. Between two connection channels 1602 and 1604 which extends through the fitting body 4th Extending from the inside out, a protrusion protrudes 1606 from the amateur body 4th so far inwards that the sealing sleeve 12th on the ledge 1606 is applied. This head start 1606 separates the circumferential test channel 1600 and a test fluid passes through the connection channel 1604 into the test channel 1600 one to after a flow through the test channel 1600 along the circumferential direction of the sealing collar 12th to the connection channel 1602 to get.

A test unit 1610 is to the connection channels 1602 and 1604 connected. The test unit 1610 includes a pump 1612 , which by means of a signal S1612, which from the control unit 32 is generated, is controlled. Depending on the supplied signal S1612, the test fluid is passed through the test channel 1600 pumped. The test fluid therefore flows along the back of the cuff over a defined cross section around the circumference of the sealing cuff 12th . Using a differential pressure sensor 1614 the signal S is determined, which is a differential pressure of the test fluid between the connection channels 1602 and 1604 represents. The test fluid enters the test channel with a first pressure 1600 pumped and it exits the test channel with a second pressure 1600 off, the difference is the result of the first and second pressure. The sensor unit 30th is by the test unit 1610 and the test channel 1600 educated. For further processing of the signal S, reference is made to the above explanations of the other exemplary embodiments, which also apply to this example.

For example, ambient air is used as the test fluid by the pump 1612 into the test channel 1600 pumped. The test unit 1610 includes, for example, an air inlet (not shown) and an air outlet (not shown). Of course, other test fluids such as oils or the like can also be used. When using air, in one example there is a further leakage sensor (not shown) in order to break through the sealing sleeve 12th via the detection of in the test channel 1600 to indicate incoming process fluid.

In addition, the test channel spans 1600 in one example only one sector on the circumference, as it is, for example 15th is executed. The connection channels assigned to one another are here 1602 and 1604 at least inwardly facing further apart than in 16 shown.

If the cross-section of the test channel now changes 1600 in at least one area, the volume flow of the test fluid through the test channel changes accordingly 1600 . Via the aforementioned differential pressure measurement between the inlet and outlet according to the connection channels 1604 and 1602 the current volume flow is recorded. In this way, a change in the volume flow can be determined over time. The signal S here also represents the tightness of the butterfly valve 2 before an internal or external leak occurs. Alternatively, one of the pump 1612 The electrical current supplied represent the signal S, which depends on the load on the pump 1612 due to a different cross-section of the test channel 1600 varies in height.

Material fatigue can lead to the test channel 1600 expands or with the flap closed 6 too much scaled down what each on the test unit 1610 and the control unit 32 can be determined.

In another example, the test channel leads 1600 at least partially through the sealing collar 12th .

Claims (18)

A butterfly valve (2) comprising a fitting body (4), a flap (6) which can be rotated within the fitting body (4) and restricts the flow of a process fluid, a sealing sleeve (12) which is located between the fitting body (4) and the flap (6) is arranged, and a sensor arrangement (30), wherein the sensor arrangement (30) is set up to provide at least one signal (S) which characterizes the tightness of the butterfly valve (2) before an internal or external leak occurs. The butterfly valve (2) according to the Claim 1 , wherein an indicator (I) characterizing the tightness of the shut-off valve (2) as a function of the signal (S) provided by the sensor arrangement and as a function of a previously determined characteristic map and / or a previously determined characteristic curve and / or a previously determined target value Value can be determined. The butterfly valve (2) according to the Claim 2 , wherein an indicator (I) characterizing the tightness of the shut-off valve (2) can also be determined as a function of a rotational position of the rotatable flap (6). The butterfly valve (2) according to the Claim 1 , 2 or 3 , wherein a shaft sealing section (20, 22) delimits a through opening of the sealing sleeve (12) for a shaft, and wherein the sensor arrangement (30) in the shaft sealing section (20, 22) is set up to provide the signal (S) indicating a sealing effect the sealing collar (12) in the area of the through opening for the shaft. The butterfly valve (2) according to the Claim 4 , wherein the sealing sleeve (12) in the shaft sealing section (20, 22) comprises a plurality of sealing lips (202-206), wherein adjacent of the sealing lips (202-206) delimit a recess (210), and wherein the sensor arrangement at least the recess ( 210) includes. The shut-off valve (2) according to Claim 4 , wherein the sensor arrangement (30) comprises a fluid sensor which converts a contact of the fluid sensor with process fluid into the signal (S), and wherein the fluid sensor is connected to the recess (210) in a fluid-carrying manner. The butterfly valve (2) according to one of the previous ones Claims 4 to 6 , wherein the sensor arrangement (30) comprises an expansion element (302), wherein the expansion element (302) expands upon contact with the process fluid, and wherein a material of the sealing sleeve (12) is between a pressure sensor of the sensor arrangement (30) and the expansion element (302 ) is arranged. The butterfly valve (2) according to one of the preceding claims, wherein a circumferential flap sealing section (806) delimits a seat (14) for the rotatable flap (6), and wherein the sensor arrangement (30) is at least partially within the flap sealing section (806) or between the Flap sealing section (806) and the fitting body (4) is arranged. The butterfly valve (2) according to the Claim 8 , wherein the sensor arrangement (10) comprises a plurality of successive and / or overlapping sensor sections (830a-830d) in the circumferential direction, wherein the sensor sections (830a-830d) are each set up to provide at least one signal which indicates the tightness of the butterfly valve ( 2) characterized before an internal or external leak occurs. The shut-off valve (2) according to Claim 8 or 9 wherein the sensor arrangement (30) comprises a plurality of optically or electrically conductive, thread-like elements (1302-1310), and wherein the signal (S) comprises the number of functional thread-like elements (1302-1310). The butterfly valve (2) according to one of the Claims 8 to 10 , wherein the sensor arrangement (30) comprises a plurality of electrically conductive layers (1004, 1006; 1102, 1104) that run at least in sections in the circumferential direction, and wherein the signal (S) has an electrical capacitance of the plurality of layers (1004, 1006; 1102, 1104). The butterfly valve (2) according to the Claim 8 to 11 , wherein the sensor arrangement comprises an electrically conductive, galvanically non-connected layer (1202) and an inductive element (1204) running at a distance from the galvanically non-connected layer (1202), and wherein the signal (S) shows the electrical inductance of the inductive element (1204 ) includes. The butterfly valve (2) according to the Claim 8 , whereby a test fluid can be pumped via connections (1602, 1604) in the fitting body (4) through a test channel (1600) which is at least partially delimited by the sealing collar (12). The butterfly valve (2) according to one of the preceding claims, wherein the material of the sealing sleeve (12) encloses at least part of the sensor arrangement (30). A method for operating a butterfly valve (2) comprising a fitting body (4), a flap (6) which can be rotated within the fitting body (4) and restricts a flow of a process fluid, a sealing sleeve (12) which is placed between the fitting body (4) and the Flap (6) is arranged, and a sensor arrangement (30), wherein the sensor arrangement (30) provides at least one signal (S) which characterizes the tightness of the butterfly valve (2) before an internal or external leak occurs. The procedure according to the Claim 15 , wherein the method for operating the butterfly valve (2) according to one of the Claims 2 to 14th is trained. A fitting body (4) for a butterfly valve (2) comprising a sensor arrangement (30) which is set up to provide at least one signal (S) which characterizes the tightness of the butterfly valve (2) before an internal or external leak occurs. A sealing sleeve (12) for a butterfly valve (2) comprising a sensor arrangement (30) which is set up to provide at least one signal (S) which characterizes the tightness of the butterfly valve (2) before an internal or external leak occurs.

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