WO2020160894A1

WO2020160894A1 - Shut-off flap valve, method, mounting body and sealing sleeve

Info

Publication number: WO2020160894A1
Application number: PCT/EP2020/051300
Authority: WO
Inventors: Michael Klemt; Werner Floegel; Sebastian HUSSACK
Original assignee: Gemü Gebr. Müller Apparatebau Gmbh & Co. Kommanditgesellschaft
Priority date: 2019-02-08
Filing date: 2020-01-20
Publication date: 2020-08-13
Also published as: DE102019103176A1; EP3824206A1

Abstract

The invention relates to a sealing sleeve (12) for arrangement between a mounting body (4) of a shut-off flap valve (2) and a flap (6) which is rotatable with respect to the mounting body (4) and limits a flow of a process fluid, the sealing sleeve (12) comprising a sensor arrangement (30), and the sensor arrangement (30) being configured to provide at least one signal (S) which characterises a tightness of the shut-off flap valve (2) with respect to internal or external leakage.

Description

Title: Butterfly valve, process, fitting body and sealing sleeve

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 of a

Butterfly valve is detected, 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 associated with an inadequate 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 is rotatable within the fitting body and restricting a flow of a process fluid, a

Sealing collar, which is arranged between the fitting body and the flap, and a sensor arrangement, the sensor arrangement being designed to include at least one

Provide a signal that the

Characterized butterfly valve before the occurrence of an internal or external leak.

The signal indicating the tightness of the butterfly valve before the occurrence of the internal or external leakage

characterized, thus forms changes in the

Sealing function from aging or damage to the flap and / or the sealing collar. The signal that characterizes the tightness of the butterfly valve is caused by an undesired change in material or arrangement. Before entering an inner or outer So leakage becomes a prediction about the

Probability of occurrence of the internal or external

Leak hit.

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 still between the flap and the sealing collar

flow through. 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 a

Monitoring triggered maintenance, the associated system can be specifically switched off without an emergency shutdown having to take place. Hence the proposed

Butterfly valve has the advantage that the

The probability of an external or internal leakage can be greatly reduced.

An advantageous example is characterized in that a tightness of the butterfly valve

characterizing indicator as a function of the signal provided by the sensor arrangement and in Can be determined as a function of a previously determined characteristic map and / or a previously determined characteristic curve and / or a previously determined setpoint value.

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

Shelf life and tightness of the butterfly valve. So it is a complex system with many

Influencing variables. 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 achieved through the proposed use of the map and / or the

Characteristic curve and / or the target value can be foreseen.

The map applied in advance is taken into account

For example, the 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 can be clearly inferred whether the flap should rest against the sealing collar in the respective rotational position or not. Consequently, for example, pressure recordings are determined over time when closing the flap and / or when opening the flap. The Recorded pressure recording is compared, for example, with a nominal profile of pressures, for example in a characteristic diagram by subtraction, and via a

Deviation criterion such as, for example, a threshold value for a tightness, in particular assigned to a tightness value in the form of the indicator. The indicator will

for example divided 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 has a through opening of the

Sealing sleeve for a shaft limited, the

Sensor arrangement in the shaft sealing section for this

is set up to provide the signal that the sealing effect of the sealing sleeve in the area of

Characterized through opening for the shaft.

The tightness of the butterfly valve is advantageously monitored from the outside in this way. The sealing sleeve is

for example, aged or damaged 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 use the

Flowing past at high speed or by a suction effect damage the sealing sleeve. Through the

early detection of a fault pattern stored in this way by means of the signal can consequently already be possible before a visible leakage of process fluid countermeasures

be initiated.

An advantageous example is characterized in that the sealing sleeve in the shaft sealing section

Comprises a plurality of sealing lips, wherein adjacent one of the sealing lips delimit a recess, and wherein the

Sensor arrangement comprises 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 the process fluid

visible exit.

An advantageous example is characterized in that the sensor arrangement has a fluid sensor which has a

Contact of the fluid sensor with process fluid converts into the signal, comprises, and wherein the fluid sensor is connected to the recess in a fluid-conducting manner. The sealing lips and at least one of the over the

Recesses formed chambers used to a

To detect sealing problem in the shaft sealing section.

An advantageous example is characterized in that the sensor arrangement comprises an expansion element, the expansion element upon contact with the

Process fluid expands, and a material of the

Sealing sleeve between a pressure sensor of the

Sensor arrangement and the expansion element is arranged. 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 at least partially within the flap sealing section or between the flap sealing section and the

Fitting body is arranged. The tightness inward between the flap and the can thus be advantageous

Sealing section are monitored. This advantageously increases process reliability. Other measuring points and measuring devices for monitoring process safety can thus

fall away. 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 has a plurality of successive and / or overlapping ones in the circumferential direction

Comprises sensor sections, wherein the sensor sections are configured to each have at least one signal

provide which the tightness of the Characterized butterfly valve (2) before the occurrence of an internal or external leak. The segmentation advantageously makes a damage pattern along the

Determined around the circumference of the sealing sleeve. So can

for example between a jammed disruptive body,

Cracks in the seat or along the circumference

uniform signs of wear can be distinguished.

An advantageous example is characterized in that the sensor arrangement has a plurality of optical or

comprises electrically conductive, thread-like elements, and wherein the signal comprises the number of functional thread-like elements. Can be beneficial

For example, a break in part of the thread-like elements can be determined. This break is caused, for example, by increased pressure on the

Flap sealing section caused. 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 has a plurality of at least

comprises electrically conductive layers that are electrically isolated from one another and run in sections in the circumferential direction, and wherein 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 that has increased over time is indicated for example a contraction of the material, perpendicular to the course of the layers.

An advantageous example is characterized in that the sensor arrangement has an electrically conductive, galvanically non-connected layer and is spaced apart from it

galvanically not connected layer running

comprising inductive element, 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. Hence can

Changes in the sealing sleeve occurring perpendicular to the course of the inductive element or the galvanically non-connected 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 is in front of the material

Damage protected.

A second aspect of this description relates to a

Method of operating a butterfly valve

comprising a fitting body, one within the

Faucet body rotatable and a flow of a Process fluid-limiting flap, a sealing sleeve which is arranged between the fitting body and the flap, and a sensor arrangement, the sensor arrangement providing 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 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 concerns one

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.

Further advantages and features can be found in the

The following description of exemplary embodiments, the same reference numerals being used also in different exemplary embodiments without explicit reference to this being made again. In the drawing show:

Figures 1, 14, 15 and 16

each a butterfly valve in a schematic section; Figures 2-7 each have a shaft sealing section

Sealing sleeve;

Figures 8a and 8b

an example of each

Butterfly valve in a schematic section according to Figure 1;

FIGS. 9-13 each have a flap sealing section of

Sealing sleeve.

Figure 1 shows a soft-sealing butterfly valve 2 in a schematic section. The shut-off flap valve 2 comprises a fitting body 4, in which a rotatable flap 6 for limiting a flow of a process fluid is arranged. The flap 6 is arranged so as to be rotatable about an axis of rotation 8 and is driven by a drive 10. The drive 10 is for example a

electric motor or pneumatic drive. In a further example, the drive 10 is manually driven and includes manual actuation. The fitting body 4 provides an inner connection area for an elastic

Sealing sleeve 12 ready. The elastic sealing collar 12 comprises an elastic material such as a vulcanized elastomer. The fitting body 4 and the

Flap 6 are made of a metal alloy, for example. The sealing cuff 12 comprises a proximal seat 14 for resting against the rotatable flap 6. The seat 14 is supported by a circumferential flap sealing section of the Sealing collar 12 provided. A respective shaft 16, 18 is rotatably connected to the flap 6 and to the

Fitting body 4 rotatably mounted. The shaft 18 is connected to the drive 10. The sealing collar 12 comprises a respective one in a shaft sealing section 20, 22

Through opening for the shaft 16, 18. In the state shown, the flap 6 is inclined and does not lie against the seat 14, whereby the flap 6 and the seat 14

Release cross-sections 24 and 26 through which the

Process fluid can flow. If the flap 6 is rotated and pressed onto the seat 14, it will

Butterfly valve 2 closed.

The sealing sleeve 12 comprises a sensor arrangement 30 which is set up to determine at least one signal S. The signal S characterizes a sealing effect of the sealing collar 12. The sealing effect of the

Sealing collar 12 is for example by a

available elasticity of the material of the sealing sleeve 12 characterized. The elasticity is measured, for example, in the circumferential direction and / or in the radial direction, starting from an imaginary central axis 28 of the sealing collar 12 and / or parallel to the central axis 28. In a further example, the sealing effect of the sealing sleeve 12 is characterized by an expansion of the material of the sealing sleeve 12. The material expansion is measured, 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. Furthermore, the sealing effect of the sealing sleeve 12 is determined by the presence of Characterized process fluid in certain areas of the sealing collar 12. Furthermore, the sealing effect of the sealing collar 12 is characterized in a further example by a pressure on the material of the sealing collar occurring in the circumferential direction and / or in the radial direction and / or parallel to the central axis 28. The

The sealing effect of the sealing collar 12 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

Loss of material, leakage to the outside

Changes to sealing contact points, crack-like

Damage, material structure changes,

Material structure changes.

The signal S is provided, for example, by means of a measuring element which is part of the sealing cuff 12. In another example, the signal S is indicated by a

Control unit 32 or a measuring element arranged remotely from the sealing sleeve 12 is determined.

The signal S is transmitted to the control unit 32. The control device 32 comprises a memory M and a processor P, a computer program C being stored on the memory M, which is explained in this description

Procedure. For example, this determines

Control unit 32 as a function of the signal S a

Indicator I, which characterizes the sealing effect of the sealing sleeve. The indicator I can comprise the signal S or the indicator I is derived from the signal S and indicates an adequate or inadequate sealing effect of the sealing collar 12. The indicator I provided can be transmitted, for example, to remotely arranged network units in order to initiate countermeasures against the insufficient sealing effect of the sealing sleeve 12. In this way, an ordering process from the manufacturer of the sealing collar 12 can be triggered and / or measures are prepared to carry out the replacement of the sealing collar 12.

The control unit 32 transmits a signal 34 for setting a rotational position 36 of the flap 6. In one example, the control unit 32 determines the indicator I provided as a function of the signal S of the sensor arrangement 30 of the sealing sleeve 12 and as a function of the

Rotational position 36 of the flap 6. For example, a setpoint pressure on the seat 14 that is predetermined in the rotary position 36 can be compared with an actual pressure which is represented by the signal S. If a deviation between the setpoint pressure and the actual pressure exceeds a threshold value determined in advance, then the indicator I indicates a lack of sealing effect of the sealing sleeve 12.

FIG. 2 shows, by way of example, the shaft sealing section 22 of the sealing collar 12 from FIG. 1 in a schematic form

Cut. The through opening for the shaft 18 is delimited by sealing lips 202, 204 and 206, the distal ends of which bear in a circular ring against the shaft 18 and which

Provide sealing effect to the outside. The sealing lips 202, 204 and 206 are circular and delimit them a respective circular recess 208 and 210. With the shaft 18, the recesses 208 and 210 delimit a respective chamber which, in an operating state without leakage, does not receive any process fluid. The sensor arrangement 30 is at least partially in the material of

Sealing collar 12 arranged.

FIG. 3 shows, by way of example, the shaft sealing section 22 of the sealing collar 12 from FIG. 1 in a schematic

Cut. The sensor arrangement 30 comprises an in

Proximal recess 210 arranged expansion element 302, which absorbs this upon contact with process fluid and thus expands. If process fluid enters the proximal chamber of the proximal recess 210, then the expansion element 302 absorbs the process fluid, expands and exerts pressure on the shaft 18 and the material of the sealing sleeve 12. The expansion element 302 is for example in only one sector of the

Arranged annular chamber, wherein fluid entering the chamber flows to the expansion element 302. The pressure built up by the expansion element 302 is measured by a pressure sensor 304, which is located between the material of the

Sealing collar 12 and the fitting body 4 is arranged prestressed, determined and as the signal S

provided. The sensor arrangement 30 thus comprises the recess 210, the expansion element 302 and the

Pressure sensor 304. The pretensioning of the pressure sensor 304 ensures that not only an expansion of the

Expansion element 302 but also a decrease in pressure and thus a loss of the pressure caused by the sealing sleeve 12 provided contact voltage in the area of the shaft sealing portion 22 is detectable.

FIG. 4 shows, by way of example, the shaft sealing section 22 of the sealing collar 12 from FIG. 1 in a schematic

Cut. The sensor arrangement 30 comprises the recess 210, a fluid channel 402 and a fluid sensor 404 which provides the signal S. The fluid channel 402 is guided through the material of the sealing collar 12 and connects the recess 210 and the fluid sensor 404 in a fluid-carrying manner.

FIG. 5 shows, by way of example, the shaft sealing section 22 of the sealing collar 12 from FIG. 1 in a schematic

Cut. The sensor arrangement 30 comprises the fluid sensor 404 which, in contrast to FIG

Material of the sealing collar 12 is arranged. The fluid sensor 404 and the proximal chamber of the proximal recess 210 are thus connected to one another in a fluid-conducting manner.

FIG. 6 shows, by way of example, the shaft sealing section 22 of the sealing collar 12 from FIG. 1 in a schematic

Cut. The sensor arrangement 30 comprises a pressure-sensitive resistance layer 602 and a measuring element 604. A pressure occurring in the material of the sealing sleeve 12 in the radial direction to a center axis of the shaft 18 causes a change in resistance in the resistance layer 602, the electrical resistance using the measuring element 604 as the signal S is detected. The resistance layer 602 runs parallel to the center axis of the shaft 18. FIG. 7 shows, by way of example, the shaft sealing section 22 of the sealing collar 12 from FIG. 1 in a schematic

Cut. The sensor arrangement 30 comprises two electrically isolated and electrically conductive layers 702 and 704 as well as a measuring element 706. The radial

Direction to the center axis of the shaft 18 in the material of the sealing sleeve 12 occurring pressure causes a

Movement of layers 702 and 704 relative to one another. 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

for example parallel to the central axis of the shaft 18.

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.

FIG. 8a shows the shut-off valve 2 in a section A-A from FIG. 1. The fitting body 4 provides a proximal connection contour 802. A distal connection contour of the sealing sleeve 12 corresponds to that

Connection contour 802 of the fitting body 4 to the

Set sealing collar 12 to the fitting body 4. The proximal connection contour 802 provides a proximal surface 804 on which the sealing sleeve 12 with the area of the opposite the seat 14

Flap sealing portion 806 rests. In the present case, the Sealing collar 12 ready undercuts into which lateral projections 808 and 810 of the connection contour 802 engage.

If the rotatable flap 6 presses on the seat 14, the sealing cuff is pressed onto the surface 804 in the region of the flap sealing section 806. The sensor arrangement 30 is arranged at least in part in the flap sealing section 806. The sealing cuff 12 uses the sensor arrangement 30 to determine a signal S which, for example, indicates a pressure or an expansion of the material

Sealing collar 12 is characterized in the radial direction to the central axis 28. In one example, the sensor arrangement 30 extends at least in the circumferential direction

segment by segment along the flap sealing section 806 running around the casing of the sealing collar 12. In a further example, the sensor arrangement 30 is divided into a plurality of successive and / or overlapping ones

Sensor sections divided, the sensor sections extending in the circumferential direction of the sealing sleeve 12. For example, the sensor arrangement 30 follows in FIG

Flap sealing section 806, at least in sections, a circular cylindrical course. The division of the

Sensor arrangement 30 in circular cylinder segments allows damage patterns to be recorded, which can be differently pronounced in the circumferential direction. Consequently, for example, between wear that occurs in

Circumferential direction uniformly and temporally large

Time intervals takes place, and a pinched

Disruptive body, which only in a segment of a circle within causes a disturbance in a short period of time.

FIG. 8b shows another based on FIG. 8a

Example of the shut-off valve 2. In contrast to FIG. 8a, the sensor arrangement 30 in FIG. 8b is not arranged in the material of the sealing sleeve 12. Rather, the sensor arrangement 30 is between the flap sealing section 806 of the sealing cuff 12 and the proximal one

Connection contour 802 of the fitting body 4 is arranged. The sensor arrangement 30 extends at least in sections in the shape of a circular ring between the fitting body 4 and the

Sealing collar 12.

The sensor arrangement 30 includes a plurality of

Sensor sections 830a, 830b, with adjacent the

Sensor sections 830a, 830b overlap or are spaced apart from one another in the circumferential direction. A

Each of the sensor sections 830a, 830b rests radially outward against the proximal surface 804 and rests radially inward against an outwardly facing surface of the sealing sleeve 12. A respective the

Sensor sections 830a, 830b represents a respective one

Sensor signal Sa, Sb ready. The sensor signals Sa, Sb represent, for example, a respective pressure which is applied to the respective sensor section 830a, 830b in the radial direction of the sealing collar 12.

The sensor sections 830a, 830b are designed, for example, as one or more pressure measurement foils. The at least one pressure measuring film is firmly connected to the fitting body 4, for example, which has the advantage that the sealing collar 12 can be replaced without the need to replace the

Sensor arrangement 30 is associated. This has advantages for the cost of the sealing collar 12 and still can

Sealing sleeve 12 can be monitored in the installed state. In addition, the definition of the sensor sections 830a, 830b in relation to cable routing is advantageous.

For example, the pressure measuring film is glued into the fitting body 4.

In another example, the pressure measuring film is firmly connected to the sealing sleeve 12. So can

Pressure measuring film, for example, glued into the sealing sleeve 12 or glued onto it. In one example, the at least one pressure measuring film is formed into a measuring cuff, not shown, which is arranged between the sealing cuff 12 and the fitting body 4.

In a further example, the sensor arrangement 30 is designed such that it is entirely or partially in a recess of the fitting body 4 and / or in a

Recess of the sealing collar 12 is located in order to be arranged between the fitting body 4 and the sealing collar 12 in this way.

FIG. 9 shows the sealing sleeve 12 in a schematic form analogous to part of the section AA from FIG. 1. The flap sealing section 806 comprises a pressure-sensitive one Resistance layer 902 as part of the sensor arrangement 30, which runs through the flap sealing section 806, formed at least as a cylinder jacket segment. The

Resistance layer 902 provides an electrical resistance as a function of the pressure exerted on it in a direction radial to the center axis of the sealing collar 12. The electrical resistance of the resistance layer 902 is provided as the signal S by means of a measuring element 906 of the sensor arrangement 30.

FIG. 10 shows the sealing collar 12 in a schematic form analogous to part of the section A-A from FIG

In contrast to FIG. 9, two layers 1004 and 1006 that are electrically isolated from one another are embedded in the material of the sealing sleeve 12. An electrical capacitance of the two layers 1004 and 1006 is provided as the signal S by means of a measuring element 1008. According to a double arrow 2002, a relative distance between the two layers 1004 and 1006 has a radial effect

Direction to the center axis of the sealing collar 12 on the determined electrical capacitance.

FIG. 11 shows the sealing collar 12 in a schematic form analogous to part of the section A-A from FIG. 1. The

Sensor arrangement comprises two electrically conductive layers 1102 and 1104 that are electrically isolated from one another.

In contrast to FIG. 10, a change in a distance between the layers 1102 and 1104 parallel to the center axis of the sealing sleeve 12 causes a change in an electrical capacitance of the two layers 1102 and 1104. The direction parallel to the center axis of the sealing collar 12 is shown according to a double arrow 1108. A

Measuring element 1110 determines the electrical capacitance in the form of the signal S.

FIG. 12 shows the sealing collar 12 in a schematic form analogous to part of the section A-A from FIG. 1. In the material of the sealing collar 12, there is an electrical one

conductive, but not galvanically connected layer 1202 is arranged. An inductive element 1204 runs at a distance from and electrically insulated from the layer 1202. A measuring element 1206 operates the inductive element 1204 in such a way that eddy currents are coupled into the layer 1202. These eddy currents cause inductive feedback in the inductive element 1204. A change in the distance between the layer 1202 and the inductive element 1204 in the radial direction to the center axis of the sealing collar 12 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 as the signal S

provided.

Figure 13 shows the sealing collar 12 in a schematic form analogous to a part of the section AA from Figure 1. In the material of the sealing collar 12 thread-like elements 1302, 1304, 1306, 1308 and 1310 are embedded, ends of the 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 are determined by means of the measuring element 1312. Is a number of conductive elements

broken, the broken ones of the elements 1302-1310 are no longer continuously conductive. The number of broken conductive elements 1302-1310 indicates a reduced sealing effect of the sealing sleeve 12. From a predetermined number of no longer continuously conductive elements 1302-1310, the measuring element 1312 determines the signal S in such a way as to indicate a reduced sealing effect of the sealing sleeve 12.

Based on FIG. 1, FIG. 14 shows a sealing collar 12, within which a vibration generator 1404 and a vibration receiver 1402 are arranged.

Of course, the vibration generator 1404 and the vibration receiver 1402 can each also be arranged on the sealing collar 12 outside the material of the latter. The vibration generator 1404 is excited to vibrate by means of a signal S2, which vibration is coupled into the material of the sealing collar 12. The coupled-in vibration propagates in the material of the sealing collar and reaches the vibration receiver 1402. The

Vibration receiver 1402 forwards the detected vibration to control unit 32 by means of a signal S1. 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, the passage for the shaft 18 is located between the vibration generator 1404 and the vibration receiver 1402. In one example, a first reference value for an oscillation response in the sense of the signal S1 is recorded in the case of a tight shaft sealing section 20, 22 and a second reference value for a leaky one

Shaft sealing section 20, 22 added. For example, an amplitude of a specific frequency in a frequency representation of the signal S1 serves as an oscillation response. A threshold value for a leaky shaft sealing section 20, 22 lies between the first and the second

Reference value, for example in the middle. If an actual value of the oscillation response of the signal S1 exceeds the aforementioned threshold value in the direction of the second

Reference value, the shaft sealing section 20, 22 is assessed as leaking. The actual value of the vibration response of the signal S1 thus characterizes the sealing effect of the

Sealing collar 12 to the outside.

In a further example, a third reference value for the vibration response in the sense of the signal S1 is recorded in the case of a tight flap sealing section 806 and a fourth reference value for a leaky one

Flap sealing portion 806 added. For example, a further amplitude of a specific further frequency serves as a frequency representation of the signal S1

Vibrational response. A threshold value for a leaky flap sealing section 806 lies between the first and the second reference value, for example in the middle.

If the actual value of the oscillation response of the signal S1 exceeds the aforementioned threshold value in the direction of the second reference value, the flap sealing section 806 is assessed as leaky. The actual value of the The vibration response of the signal S1 thus characterizes the sealing effect of the sealing sleeve 12 inward.

The example according to FIG. 14 can advantageously be used both in the case of an elastic sealing sleeve 12 and in the case of a non-elastic and thus rigid

Use sealing collar 12.

FIG. 15 shows the example from FIG. 8b in a schematic section. It is shown that a plurality of at least four sensor sections 830a to 830d extend in the circumferential direction between the fitting body 4 and the

Sealing collar 12 extend. Of course, the number of sensor sections can be increased in order to enable better resolution and localization of errors. In the circumferential direction, the sensor sections 830a to 830d are spaced apart from one another and in particular save the

Areas of the shafts 16 and 18. As a result of the introduction between the sealing sleeve 12 and the fitting body 4, the pressure-sensitive sensor sections 830a to 830d are pretensioned and, for example, already deliver onto the sealing sleeve 12 without the flap 4 being pressed

Pressure signal according to the respective signal Sla to Sld.

Of course, the sensor sections 830a to 830d can also partially overlap and be guided further in the direction of the shafts 16, 18 or the corresponding ones

Even span shaft sections. As a result of the sector-shaped arrangement of the sensor sections 830a to 83d, a pressure curve in is generated via the respective signals Sla to Sld

Circumferential direction determined. Consequently, through a relative comparison of the pressure conditions in the four areas in which the sensor sections 830a to 830d are arranged, it can be determined whether, for example, the sector in which the sensor section 830b is arranged has a particularly high or particularly low pressure. In the case of a particularly high pressure, which is represented by the signal Slb, one in the assigned sector between the flap 6 and the

Sealing collar 12 jammed foreign bodies are closed. At a particularly low pressure, which is represented by the signal Slb, a

decreasing elasticity or damage to the

Sealing sleeve 12 or a damaged flap 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 film is introduced or arranged between the fitting body 4 and the sealing collar 12. The vibration generator 1500 is excited to vibrate by means of a signal S1500. The valve body 4 and the sealing collar 12 are excited to vibrate, which is reflected in the signals Sla to Sld. The vibration response determined in this way can also be evaluated by means of a map or characteristic curve determined in advance.

FIG. 16 shows, in a schematic section, a further example of the butterfly valve 2. In the one shown Section, a test channel 1600 is arranged between the fitting body 4 and the sealing collar 12, which one

Releases flow cross-section. Behind and in front of the

In the plane of the drawing, the sealing collar 12 rests on the fitting body 4. Between two connection channels 1602 and 1604, which extend through the fitting body 4 from the inside to the outside

extend, a projection 1606 protrudes from the amateur body 4 so far inwards that the sealing collar 12 rests against the projection 1606. This projection 1606 separates the circumferential test channel 1600 and a test fluid enters the test channel 1600 via the connection channel 1604 in order to, after flowing through the test channel 1600, along the

Circumferential direction of the sealing collar 12 to the

Connection channel 1602 to arrive.

A test unit 1610 is connected to the connection channels 1602 and 1604. The test unit 1610 comprises a pump 1612, which is controlled by means of a signal S1612 that is generated by the control unit 32. In

The test fluid is pumped through the test channel 1600 as a function of the supplied signal S1612. The test fluid thus flows along the back of the cuff over a defined cross-section around the circumference

Sealing collar 12. By means of a differential pressure sensor 1614, the signal S is determined which one

Differential pressure of the test fluid between the connection channels 1602 and 1604 represents. If the test fluid is pumped into the test channel 1600 at a first pressure and it emerges from the test channel 1600 at a second pressure, then the difference results from the first and second pressures. The Sensor unit 30 is formed by test unit 1610 and test channel 1600. For further processing of the signal S, refer to the above explanations of the other

Reference embodiments that apply to this example as well.

For example, ambient air is pumped into the test channel 1600 as test fluid by the pump 1612. The test unit 1610 includes, for example, one not shown

Air inlet and an air outlet, not shown.

Of course, other test fluids such as oils or the like can also be used. When using air, a further leakage sensor (not shown) is present in one example, to provide a

To indicate breakthrough of the sealing sleeve 12 via the detection of process fluid entering the test channel 1600.

Furthermore, in one example, the test channel 1600 spans only one sector on the circumference, as is the case

is carried out for example to Figure 15. In this case, the connection channels 1602 and 1604 assigned to one another are at least further spaced apart from one another when facing inwards than shown in FIG.

If the cross section of the test channel 1600 changes in at least one area, the volume flow of the test fluid through the test channel 1600 changes accordingly. So can be over time detect a change in the volume flow. The signal S also represents the tightness of the

Butterfly valve 2 before an internal or external leak occurs. Alternatively, an electrical current supplied to the pump 1612 can also generate the signal S

represent which, depending on the load on the pump 1612, turns out to be different in height due to a different cross section of the test channel 1600. Material fatigue can lead to the

Test channel 1600 widens or reduces too much when the flap 6 is closed, which can be determined in each case via the test unit 1610 and the control unit 32. In a further example, the test channel 1600 leads at least partially through the sealing collar 12.

Claims

1. A butterfly valve (2) comprising a

Fitting body (4), one inside the fitting body

(4) rotatable flap (6) which limits a flow of a process fluid, a sealing sleeve (12) which is arranged between the fitting body (4) and the flap (6), and a sensor arrangement (30), the sensor arrangement (30) is set up to provide at least one signal (S), which characterizes a tightness of the shut-off valve (2) before an internal or external leak occurs.

2. The butterfly valve (2) according to claim 1, wherein an indicator (I) characterizing the tightness of the butterfly valve (2) as a function of the signal provided by the sensor arrangement

(5) and as a function of a previously determined characteristic map and / or a previously determined characteristic curve and / or a previously determined setpoint value

can be determined.

3. The butterfly valve (2) according to claim 2, wherein an indicator (I) characterizing the tightness of the butterfly valve (2) is additionally shown in

Can be determined as a function of a rotational position of the rotatable flap (6).

4. The butterfly valve (2) according to claim 1, 2 or 3, wherein a shaft sealing portion (20, 22) a The through opening of the sealing collar (12) for a shaft is limited, and the sensor arrangement (30) in the shaft sealing section (20, 22) is set up to provide the signal (S) which indicates a sealing effect of the sealing collar (12) in the area of the through opening for characterizes the wave.

5. The butterfly valve (2) according to claim 4, wherein the sealing collar (12) in the

Shaft sealing portion (20, 22) a plurality of

Sealing lips (202-206), with adjacent one of the sealing lips (202-206) having a recess (210)

limit, and wherein the sensor arrangement comprises at least the recess (210).

6. The butterfly valve (2) according to claim 4, wherein the sensor arrangement (30) comprises a fluid sensor which converts 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 .

7. The butterfly valve (2) according to one of the preceding 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 arranged between a pressure sensor of the sensor arrangement (30) and the expansion element (302). 8. The butterfly valve (2) according to one of the preceding claims, wherein a circumferential

Flap sealing section (806) limits a seat (14) for the rotatable flap (6), and wherein the

The sensor arrangement (30) is arranged at least partially inside the flap sealing section (806) or between the flap sealing section (806) and the fitting body (4).

9. The butterfly valve (2) according to claim 8, wherein the sensor arrangement (10) comprises a plurality of successive and / or overlapping sensor sections (830a-830d) in the circumferential direction, the sensor sections (830a-830d) in addition

are set up to provide at least one signal which indicates the tightness of the

Characterized butterfly valve (2) before the occurrence of an internal or external leak.

10. The butterfly 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) indicates the number of functional thread-like elements ( 1302-1310).

11. The butterfly valve (2) according to one of the

Claims 8 to 10, wherein the sensor arrangement (30) has a plurality of at least partially in

Circumferential electrically conductive layers (1004, 1006; 1102, 1104), and wherein the signal (S) comprises an electrical capacitance of the plurality of layers (1004, 1006; 1102, 1104).

12. The butterfly valve (2) according to claim 8 to 11, wherein the sensor arrangement is an electrical

conductive, galvanically not connected layer

(1202) and an inductive element (1204) running at a distance from the galvanically non-connected layer (1202), and wherein the signal (S) comprises the electrical inductance of the inductive element (1204).

13. The butterfly valve (2) according to claim 8, wherein a test fluid via connections (1602, 1604) in the fitting body (4) through a test channel (1600) which is at least partially from the

Sealing collar (12) is limited, can be pumped.

14. The butterfly valve (2) according to one of the preceding claims, wherein the material of the sealing collar

(12) encloses at least part of the sensor arrangement (30).

15. A method of operating a

Butterfly valve (2) comprising a

Fitting body (4), one inside the fitting body

(4) rotatable flap (6) which limits a flow of a process fluid, a sealing sleeve (12) which is arranged between the fitting body (4) and the flap (6), and a sensor arrangement (30), wherein the sensor arrangement (30) provides at least one signal (S) which indicates a tightness of the

Characterized butterfly valve (2) before the occurrence of an internal or external leak. 16. The method according to claim 15, wherein the

Method for operating the butterfly valve (2) according to one of claims 2 to 14 is formed.

17. A fitting body (4) for a butterfly valve

(2) comprising a sensor arrangement (30) which is set up to transmit at least one signal (S)

provide, which a tightness of the

18. 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 shut-off valve (2) before an internal or external leak occurs.