KR20210114215A - Butterfly valve inspection apparatus having a rotary pressure sensor - Google Patents

Abstract

The present invention relates to a butterfly valve inspection device having a rotary pressure sensor, which determines whether a disk configuring a butterfly valve can stably control fluid and determines which part of the disk is vulnerable to high pressure. According to the present invention, a rotary type pressure measurement means is rotated to monitor and display a change of a pressure value to identify that which portion of a disk edge configuring the butterfly valve is vulnerable to the high pressure, so that a manager can intuitively check which portion of a disk circumference has a problem to reduce time for identifying the problem and rapidly deal with the problem.

Description

Butterfly valve inspection device with rotary pressure sensor {BUTTERFLY VALVE INSPECTION APPARATUS HAVING A ROTARY PRESSURE SENSOR}

The present invention relates to a butterfly valve inspection apparatus having a rotary pressure sensor, and more particularly, to a rotary pressure sensor capable of confirming whether a disk constituting a butterfly valve is airtight under conditions of high pressure and high temperature. It relates to a butterfly valve inspection device.

In general, a butterfly valve is used for supplying and shutting off various types of water, and a disk-shaped disk inside a round body is usually assembled on a rotating shaft to open and close the flow path of the valve.

Referring to Figure 1, the butterfly valve is composed of a body (2) of a tubular body installed with a body metal seat, and a disk (4) pivotally supported by the body (2) and provided with a disk seat on a circumferential surface. The disc sheet is installed in a removable and replaceable manner at the circumferential end of the disc 4, and has a structure in airtight contact with the body metal sheet. In addition, the disk seat has a structure that is firmly fixed to the disk by bolts or the like.

However, the prior art as described above has the following problems.

As described above, the butterfly valve intercepts the fluid by manipulating the disk, and it is necessary to check whether the fluid can be stably intercepted when the fluid is high temperature and high pressure, but there is no device to inspect it. It was difficult to check.

In order to solve this problem, Patent Registration No. 10-1091882 (butterfly valve inspection device) has a first pipe body whose one end is blocked by a valve and the other end is shielded; a second pipe body whose one end is blocked by the valve and the other end is shielded; temperature sensors respectively installed in the first pipe body and the second pipe body; pressure sensors respectively installed on the first pipe body and the second pipe body; a heater for heating the first pipe body and the second pipe body; a pump for providing pressure inside the first pipe body and the second pipe body; And a control unit for controlling the pressure sensor, the temperature sensor, the heater and the pump; by configuring, it is checked whether the butterfly valve can stably control the high temperature and high pressure fluid.

However, Patent Registration No. 10-1091882 has a problem in that it cannot be confirmed which part of the circumference of the disk constituting the butt fly valve is vulnerable to high pressure and which part of the circumference of the disk is not well maintained.

Republic of Korea Patent Publication No. 10-1091882 (2011.12.02)

The present invention has been devised to solve the problems of the prior art as described above, and it is possible to determine whether the disk constituting the butterfly valve can stably control the fluid and which part of the disk is vulnerable to high pressure. It is to provide a butterfly valve inspection device having a rotary pressure sensor.

According to a feature of the present invention for achieving the above object, a butterfly valve inspection device having a rotary pressure sensor according to the present invention includes a pipe body having one end blocked by a butterfly valve, the other end being shielded; A plurality of lower legs are magnetically attached to one surface of a disk constituting the butterfly valve, and a pressure sensor provided in a plurality of upper arms rotates, while inside the pipe body, an edge of a disk constituting the butterfly valve rotational pressure measuring means for measuring the pressure change of the; and a control unit for controlling the temperature sensor, controlling the rotational speed of the plurality of arms of the rotary pressure measuring means, and monitoring the measured values and changes of the pressure sensors respectively provided in the plurality of arms.

And, the rotary pressure measuring means, the body provided in the center; a plurality of legs provided at regular intervals around the body to support one surface of the disk constituting the butterfly valve; magnets respectively provided at the ends of the plurality of legs and attached to one surface of the disk; a motor provided inside the body; a rotating body provided on the upper portion of the body and rotating by driving of the motor; a plurality of arms provided at regular intervals around the rotating body to rotate in a clockwise or counterclockwise direction; and a plurality of pressure sensors that are detachably coupled to the ends of the plurality of arms to measure a change in pressure at the edge of the disk.

In addition, the plurality of legs and the plurality of arms can be inserted and withdrawn so that they can be expanded and contracted according to the diameter of the disk.

In addition, the control unit records, in the memory, the amount of change in pressure measured at regular time intervals while the pressure sensors provided in each of the plurality of arms rotate and move, and compares the amount of change in pressure measured by each pressure sensor to exceed a certain level or higher. Find the pressure sensor that detects the pressure difference.

In addition, the control unit calculates the rotational movement speed and time of the pressure sensor to determine the current position of each pressure sensor and the current position of the pressure sensor in which a pressure difference of a certain level or more is sensed and displayed through the monitor, the predetermined level The corresponding part of the disk measured by the pressure sensor that detects the pressure difference is displayed through the monitor.

Butterfly valve inspection device having a rotary pressure sensor according to the present invention has the following effects.

As the rotary pressure measuring means rotates, it is possible to monitor and show which part of the edge of the disk constituting the butterfly valve is vulnerable to high pressure by monitoring the change in pressure value, so the administrator can intuitively check which part of the disk has a problem. This can shorten the time to identify problems and enable quick response.

1 is a perspective view of a rotary pressure measuring means constituting a butterfly valve inspection device having a rotary pressure sensor according to the present invention.
Figure 2 is a perspective view showing an example of a rotary pressure measuring means attached to the disk of the butterfly valve.
Figure 3 is a configuration diagram showing a configuration of the first embodiment of the configuration of the butterfly valve inspection device having a rotary pressure sensor according to the present invention.
Figure 4 is a configuration diagram showing a second embodiment of the configuration of the butterfly valve inspection device having a rotary pressure sensor according to the present invention.
Figure 5 is a perspective view showing the configuration of a butterfly valve inspection device having a rotary pressure sensor according to the present invention.

Terms used in this specification will be briefly described, and the present invention will be described in detail.

The terms used in the present invention have been selected as currently widely used general terms as possible while considering the functions in the present invention, but these may vary depending on the intention or precedent of a person skilled in the art, the emergence of new technology, and the like. In addition, in a specific case, there is a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the corresponding invention. Therefore, the terms used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, rather than the simple name of the term.

In the entire specification, when a part "includes" a certain element, this means that other elements may be further included, rather than controlling other elements, unless otherwise stated. In addition, terms such as “unit” described in the specification mean a unit for processing at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Hereinafter, a preferred embodiment of a butterfly valve inspection apparatus having a rotary pressure sensor according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 5, in the butterfly valve inspection device having a rotary pressure sensor according to the present invention, one end is blocked by the valve 10 and the other end is shielded from the pipe body 20, and the Rotational pressure measuring means 80 for measuring the pressure change of the edge of the disk 4 constituting the butterfly valve 10 in the inside of the pipe body 20, and the control unit 70 for monitoring the measured value and the amount of change of the pressure sensor ), including a temperature sensor 30 that can measure the temperature inside the pipe body 20, and a main pressure sensor 40 that can measure the pressure inside the pipe body 20 can be

First, the butterfly valve inspection device of the present invention is provided with a butterfly valve (10). The butterfly valve 10 is a butterfly valve inspection device having a rotary pressure sensor according to the present invention, as shown in FIGS. 3 to 5 as an object for substantially inspecting.

A pipe body 20 is provided in the inspection device for inspecting the butterfly valve. 3 to 5, the pipe body 20 is formed in a pipe shape, one end is blocked by the valve 10, the other end is configured to be shielded. That is, the pipe body 20 forms a predetermined space by the butterfly valve 10 to provide a space that allows an environment suitable for experimental conditions to be formed.

The rotary pressure measuring means 80 has a plurality of lower legs 85a to 85d attached to one surface of the disk 4 constituting the butterfly valve 10 with magnets 86a to 86d, and a plurality of upper legs 85a to 85d. While the pressure sensors 90a to 90d provided in each arm 89a to 89d rotate, the pressure change of the edge of the disk 4 constituting the butterfly valve 10 is measured inside the pipe body 20 .

Specifically, the rotary pressure measuring means 80 is provided at regular intervals around the body 81 and the body 81 provided at the center, one surface of the disk 4 constituting the butterfly valve 10 . a plurality of legs 85a to 85d for supporting A motor (not shown in the drawing) provided therein, a rotating body 82 provided on the upper portion of the body 81 and rotating by driving the motor (not shown), and a circumference of the rotating body 82 . A plurality of arms (89a to 89d) provided at regular intervals and rotated clockwise or counterclockwise and detachably coupled to the ends of the plurality of arms (89a to 89d) to measure the pressure change at the edge of the disk (4) It is composed of two pressure sensors (90a to 90d).

The plurality of legs 85a to 85d and the plurality of arms 89a to 89d can be inserted and withdrawn so that they can be expanded and contracted corresponding to the diameter of the disk 4 .

Referring to FIG. 1 , the four legs 85a to 85d are attached at regular intervals around the body 81 , respectively, and the fixing part 83 and the fixing part 83 are fixed to the body 81 . It is composed of a movable part 84 that can be inserted and withdrawn inside.

A plurality of holes h are formed in the fixing part 83 , and a plurality of pressing pins p are provided in the moving part 84 . When the moving part 84 is inserted into the fixed part 83, the length of the legs 85a to 85d is shortened, and when the moving part 84 is pulled out of the fixed part 83, the legs 85a to 85d are) length is increased

When the moving part 84 is inserted into the fixed part 83, the pressing pin (p) is inserted in a pressed state, and the pressing pin (p) pops up from the hole (h) position to prevent the movement of the moving part (84). is fixed Conversely, when withdrawing the moving part 84 to the outside of the fixed part 83, it is withdrawn while pressing the pressing pin (p).

The end of the moving part 84 is bent at a right angle, and magnets 86a to 86d are installed under the bent portion. It can be attached to one surface of the disk 4 by using the magnets 86a to 86d, and by adjusting the length of the legs 85a to 85d using the moving part 84 and the fixing part 83, the magnet 86a ~86d) can be properly selected.

Referring to FIG. 1 , the four arms 89a to 89d are attached at regular intervals around the rotation body 82 , respectively, and a fixing part 87 and a fixing part 87 which are fixedly installed on the rotation body 82 . ) is composed of a movable part 88 that can be inserted and withdrawn to the inside. A hole (h) is formed in the fixed part 87 , and a pressing pin (p) is provided in the moving part 88 , and the moving part 88 is inserted and drawn into the fixed part 87 to adjust the length. The configuration is the same as the legs 85a to 85d discussed above.

The length can be adjusted to fit the diameter of the disk 4 through insertion and withdrawal of the moving part 88 toward the fixed part 87 side. At the end of the moving part 88, pressure sensors 90a to 90d are provided. The pressure sensors 90a to 90d may be fastened to the end of the moving part 88 in various ways. By adjusting the length, each pressure sensor 90a to 90d must be positioned close to the edge of the disk 4 to accurately measure which part of the disk has a problem. That is, it is possible to accurately monitor the change in the pressure value around the disk.

A sealing ring is installed around the disk 4 to increase airtightness, but when used for a long time, abrasion of the sealing ring, etc. may occur, which may cause water leakage. When the pressure sensors 90a to 90d are positioned close to the edge of the disk 4, the location of the leak due to the wear of the sealing ring can be accurately identified.

The pressure values measured by each of the pressure sensors 90a to 90d are transmitted to the body 81 through a cable provided inside the arms 89a to 89d, and a transceiver (not shown) provided in the body 81 . ) is transmitted to the control unit 70 by wire or wirelessly. When transmitting by wire, the cable connected to the transceiver provided in the body 81 is connected to the communication unit provided inside the pipe body 20 so that communication with the control unit 70 is possible. When transmitting wirelessly, the transmission/reception unit provided in the body 81 is wirelessly connected to the communication unit provided inside the pipe body 20 so that communication with the control unit 70 is possible.

A plurality of legs (85a to 85d) and a plurality of arms (89a to 89d) are designed and assembled to withstand high pressure of a certain level or more.

In addition, a temperature sensor 30 is provided on the pipe body 20 . The temperature sensor 30 serves to determine whether the temperature to be measured is the temperature to be measured so as to check whether the butterfly valve 10 to be inspected can withstand high temperatures.

In addition, the main pressure sensor 40 is provided on the pipe body 20 . The main pressure sensor 40 serves to check whether the pressure to be measured is the pressure to be measured so as to check whether the butterfly valve 10 to be inspected can withstand high pressure.

In addition, a heater 50 is provided in the pipe body 20 . The heater 50 serves to provide heat to the inside of the pipe body 20 in a high temperature state at which the butterfly valve 10 to be inspected is to be measured. The heater 50 may be provided inside the pipe body 20 , or a hot air fan (not shown) may be provided outside to allow heat to flow into the pipe body 20 .

In addition, the pipe body 20 is provided with a pump (60). The pump 60 serves to provide pressure to the inside of the pipe body 20 in a state of high pressure to be measured by the butterfly valve 10 to be inspected.

In addition, the main pressure sensor 40, the temperature sensor 30, the heater 50, and the control unit 70 through which the operator can control the pump 60 is provided. The control unit 70 controls the rotational speed of the plurality of arms 89a to 89d of the rotary pressure measuring means 80, and the measured values of the pressure sensors 90a to 90d respectively provided in the plurality of arms 89a to 89d. and monitoring the amount of change.

The control unit 70 is provided with a monitor (not shown) so as to know the situation inside the pipe body 20 .

The control unit 70 records in the memory the amount of change in pressure measured at regular time intervals while the pressure sensors 90a to 90d respectively provided in the plurality of arms 89a to 89d rotate and move, and the pressure measured by each pressure sensor. Find a pressure sensor that detects a pressure difference over a certain level by comparing the amount of change.

For example, the plurality of arms 89a to 89d may move at a distance of 1 cm per second, and the amount of change in pressure for each location may be recorded in the memory at intervals of 1 second.

Specifically, the control unit 70 calculates the rotational movement speed and time of the pressure sensors 90a to 90d to detect the current position of each pressure sensor 90a to 90d and the pressure difference over a certain level. ) is detected and displayed through the monitor, and the corresponding portion of the disk 4 measured by the pressure sensors 90a to 90d, which detects a pressure difference above a certain level, is displayed through the monitor.

A pressure value measured by any one of the first pressure sensor 90a, the second pressure sensor 90b, the third pressure sensor 90c, and the fourth pressure sensor 90d is different from the pressure measured by the other pressure sensors If there is a difference between the value and the predetermined level or more, the control unit 70 can check through the monitor whether the pressure value measured by the pressure sensor is abnormal, and at which part of the disk 4 using the rotational movement speed and time You can see if there is a change in pressure.

If the first pressure sensor 90a is manually positioned to come to the 12 o'clock position for accurate position tracking and then controlled through the control unit 70, the precise position of each pressure sensor 90a to 90d is performed using the rotational movement speed and time. tracking is possible.

Next, another embodiment of a butterfly valve inspection apparatus having a rotary pressure sensor according to the present invention will be described.

As shown in FIG. 4, the butterfly valve inspection device having the rotary pressure sensor has a first pipe body 20a having one end blocked by a valve 10 and the other end shielded, and the valve ( 10) a second pipe body 20b having one end blocked and the other end shielded, and a temperature sensor 30a installed on at least one of the first pipe body 20a and the second pipe body 20b, 30b) and the main pressure sensors 40a and 40b installed on at least one of the first pipe body 20a and the second pipe body 20b.

As described above, the pipe body 20 may include a first pipe body 20a and a second pipe body 20b. Referring to FIG. 4 , the rotary pressure measuring means 80 is preferably installed on either one of the two pipe bodies 20a and 20b.

As in the first embodiment described above, the butterfly valve 10 is provided in the butterfly valve inspection device having the rotary pressure sensor. The butterfly valve 10 is as shown in FIG. 2 as an object for the butterfly valve inspection apparatus of the present invention to inspect substantially.

In the inspection device for inspecting the butterfly valve 10 , pipe bodies 20a and 20b are provided on both sides of the butterfly valve 10 as shown in FIG. 4 . The pipe body (20a, 20b) has the butterfly valve (10) in the center, and is divided into a first pipe body (20a) and a second pipe body (20b), respectively, and each other end is configured to be shielded.

That is, each of the first pipe body 20a and the second pipe body 20b forms a predetermined space by the butterfly valve 10, so that an environment suitable for experimental conditions can be formed. provides

In addition, temperature sensors 30a and 30b are provided in the first pipe body 20a and the second pipe body 20b. It is provided on either side of the space inside the first pipe body 20a and the second pipe body 20b, and is the temperature to be measured so as to measure whether the butterfly valve 10 can withstand high temperature. to know whether or not Of course, temperature sensors 30a and 30b may be provided in each of the first pipe body 20a and the second pipe body 20b, respectively.

In addition, the first pipe body 20a and the second pipe body 20b are provided with main pressure sensors 40a and 40b. Is the pressure to be measured so as to be provided on either side of the space inside the first pipe body 20a and the second pipe body 20b to measure whether the butterfly valve 10 can withstand high pressure? to know whether or not Of course, main pressure sensors 40a and 40b may be provided in each of the first pipe body 20a and the second pipe body 20b, respectively.

After measuring the pressure change of the first pipe body 20a and the second pipe body 20b with the main pressure sensors 40a and 40b, when a change in pressure is detected, the control unit 70 then rotates the pressure measuring means ( 80), it is also possible to measure more precisely where the problem is located on the disk 4 .

In addition, a heater 50 is provided in the pipe body 20a, 20b. The heater 50 serves to provide heat to the inside of the pipe body 20a, 20b at a high temperature to be measured by the butterfly valve 10 to be inspected. The heater 50 may be provided inside the pipe body 20a, 20b, or a hot air fan (not shown) may be provided outside to allow heat to flow into the pipe body 20a, 20b.

In addition, the pipe body (20a, 20b) is provided with a pump (60). The pump 60 serves to provide pressure to the inside of the pipe body 20a, 20b in a state of high pressure to be measured by the butterfly valve 10 to be inspected.

In addition, the main pressure sensor (40a, 40b), the temperature sensor (30a, 30b), the heater 50 and the control unit 70 that can control the pump 60 is provided. The control unit 70 may be further provided with a monitor (not shown) so as to know the situation inside the pipe body (20a, 20b).

Hereinafter, the operation of the butterfly valve inspection apparatus having a rotary pressure sensor according to the present invention having the configuration as described above will be described in detail.

First, with reference to the bar shown in FIG. 3, the operation of the first embodiment of the butterfly valve inspection apparatus having a rotary pressure sensor according to the present invention will be described.

A rotary pressure measuring means 80 is attached to one surface of the disk 4 constituting the butterfly valve 10 to be inspected, and the butterfly valve 10 is assembled to the pipe body 20 . Close the butterfly valve (10). Then, by manipulating the control unit 70, the inside of the pipe body 20 is adjusted to meet the condition to be inspected for the butterfly valve 10 .

Specifically, by applying power to the heater 50 , heat is applied to the inside of the pipe body 20 . Then, the inside of the pipe body 20 is formed at a high temperature suitable for the experimental conditions of the butterfly valve (10). Whether the temperature inside the pipe body 20 is formed at a high temperature, the operator can know by the temperature sensor 30 .

The operator can check whether the butterfly valve 10 can withstand the high temperature situation.

In addition, the operator operates the control unit 70 to apply power to the pump 60 . When power is applied to the pump 60 , pressure is applied to the inside of the pipe body 20 . Then, the inside of the pipe body 20 is formed at a high pressure suitable for the experimental conditions of the butterfly valve (10). The operator can know this situation by the main pressure sensor 40 . After detecting a change in pressure by the main pressure sensor 40, the rotational pressure measuring means 80 may be driven for more precise diagnosis to be tested by the method described above.

As a result, the operator can check whether the butterfly valve 10 can withstand the high-pressure situation and which part of the disk 4 has a problem.

Next, with reference to the bar shown in FIG. 4, the operation of the second embodiment of the butterfly valve inspection device having a rotary pressure sensor according to the present invention will be described.

A rotary pressure measuring means 80 is attached to one surface of the disk 4 constituting the butterfly valve 10 to be inspected, and the butterfly valve 10 is connected to the first pipe body 20a and the second pipe body. Assemble between (20b). Then, the butterfly valve 10 is closed. After locking the butterfly valve 10 , the control unit 70 is operated to adjust the inside of each of the pipe bodies 20a and 20b to meet the conditions to be inspected for the butterfly valve 10 .

Specifically, by applying power to the heater 50, heat is applied to the inside of the pipe body 20a, 20b. Then, the inside of the pipe body (20a, 20b) connected to the heater 50 is formed at a high temperature suitable for the experimental conditions of the butterfly valve (10). The operator can know this situation by the temperature sensors 30a and 30b.

The operator can check whether the butterfly valve 10 can withstand the high temperature situation.

In addition, the operator operates the control unit 70 to apply power to the pump 60 . When power is applied to the pump 60 , pressure is applied to the inside of the pipe bodies 20a and 20b connected to the pump 60 . Then, the inside of the pipe body (20a, 20b) is formed at a high pressure suitable for the experimental conditions of the butterfly valve (10). The operator can know this situation by the main pressure sensor 40 .

After detecting a change in pressure by the main pressure sensor 40, the rotational pressure measuring means 80 may be driven for more precise diagnosis to be tested by the method described above.

And, assuming that the pipe body to which the pump 60 is connected and the high pressure is formed is the first pipe body 20a, the butterfly valve is operated by the main pressure sensors 40a and 40b in the second pipe body 20b. Through it, you can see whether the pressure is leaking or not.

As a result, the operator can check whether the butterfly valve 10 can withstand the high-pressure situation and which part of the disk 4 has a problem.

What has been described above is only one embodiment for implementing the butterfly valve inspection device having a rotary pressure sensor according to the present invention, and the present invention is not limited to the above embodiment, and is claimed in the claims below. As described above, without departing from the gist of the present invention, it will be said that the technical spirit of the present invention exists to the extent that various modifications can be made by anyone with ordinary knowledge in the field to which the present invention belongs.

10: butterfly valve 20: pipe body
30: temperature sensor 40: main pressure sensor
50: heater 60: pump
70: control unit 80: rotary pressure measuring means

Claims (5)

One end is blocked by a butterfly valve, the other end is a shielded pipe body;
A plurality of lower legs are magnetically attached to one surface of a disk constituting the butterfly valve, and a pressure sensor provided in a plurality of upper arms rotates, while inside the pipe body, an edge of a disk constituting the butterfly valve rotational pressure measuring means for measuring the pressure change of the; and
A control unit for controlling the temperature sensor, controlling the rotational speed of the plurality of arms of the rotary pressure measuring means, and monitoring the measured values and the amount of change of the pressure sensors respectively provided in the plurality of arms; characterized in that it comprises a Butterfly valve inspection device equipped with a rotary pressure sensor. According to claim 1,
The rotary pressure measuring means,
a body provided in the center;
a plurality of legs provided at regular intervals around the body to support one surface of the disk constituting the butterfly valve;
magnets respectively provided at the ends of the plurality of legs and attached to one surface of the disk;
a motor provided inside the body;
a rotating body provided on the upper portion of the body and rotating by driving of the motor;
a plurality of arms provided at regular intervals around the rotating body to rotate in a clockwise or counterclockwise direction; and
A butterfly valve inspection apparatus having a rotary pressure sensor, comprising a; a plurality of pressure sensors detachably coupled to the plurality of arm ends to measure a change in pressure at the edge of the disk. 3. The method of claim 2,
The plurality of legs and the plurality of arms can be inserted and pulled out, so that the butterfly valve inspection device having a rotational pressure sensor, characterized in that it can be expanded and contracted according to the diameter of the disk. According to claim 1,
The control unit is
The pressure sensor provided in each of the plurality of arms rotates and moves, records the amount of change in pressure measured at regular time intervals in the memory, and compares the amount of change in pressure measured by each pressure sensor to detect a pressure difference of a certain level or more. Butterfly valve inspection device having a rotary pressure sensor, characterized in that it finds the sensor. 5. The method of claim 4,
The control unit is
By calculating the rotational movement speed and time of the pressure sensor, the current position of each pressure sensor and the current position of the pressure sensor at which a pressure difference over a certain level is detected is displayed through the monitor,
Butterfly valve inspection apparatus having a rotary pressure sensor, characterized in that the display through the monitor the corresponding portion of the disk measured by the pressure sensor in which the pressure difference of the predetermined level or more is sensed.

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