KR101836085B1 - Fluid leakage self-diagnosis system - Google Patents

Abstract

The present invention relates to a system for self-diagnosing a leakage of a fluid, and more particularly, to the system for self-diagnosing a leakage of a fluid, which is configured to, in a facility operated using a fluid (water, oil, steam, etc.), diagnose a leakage of a fluid in a state where a control valve is closed, based on measured values such as vibration noises measured by a sensor installed inside a stem of the control valve for controlling a flow rate and pressure of the fluid.

Description

[0001] Fluid leakage self-diagnosis system [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid leakage self-diagnosis system, and more particularly, to a fluid leakage self-diagnosis system which is installed in a control valve for controlling the flow rate and pressure of a fluid in an apparatus operated using a fluid (water, oil, steam, And a fluid leakage self-diagnosis system for diagnosing fluid leakage in a closed state.

A fluid device that controls the flow rate and pressure of a fluid in a facility (such as a plant, such as a power plant, a chemical plant, or an offshore plant) that uses fluid (water, steam, or oil) is called a control valve.

When the control valve is closed, fluid may leak due to damage to the seat ring (fixed in the orifice area of the flow path) and plug (opening / closing of the flow path), and if the initial fluid leakage is not detected, Thereby causing an increase in the maintenance cost in industrial facilities.

Although the conventional control valve is locked, the fluid leakage of the control valve through which the fluid flows is mainly detected by human hearing or tactile sense. Such a method has a problem that can be detected only when the state of the valve packing or the seal is significantly deteriorated and the valve leakage is significant.

When a separate fluid leakage detection device is used, a plurality of acoustic sensors are attached to the area where the fluid leakage is suspected (control valve body exterior), and the signal detected by the acoustic sensor is analyzed by the microcomputer, Discloses a technique for notifying whether a valve is leaked through a leak or an alarm sound.

However, such equipment is expensive equipment, and there is a problem in that it is costly to constantly monitor a specific control valve.

Korean Patent No. 10-0387334 discloses a device for detecting a fluid leakage of a valve.

Korean Registered Patent [10-0387334] (Registered Date: May 30, 2003)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a control valve for controlling the flow rate and pressure of a fluid in an apparatus operated using a fluid (water, oil, The present invention provides a fluid leakage self-diagnosis system that diagnoses fluid leakage in a closed state of a control valve based on measured values such as vibration noise measured through a sensor installed in a stem of the stem.

The objects of the embodiments of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description .

According to an aspect of the present invention, there is provided a fluid leakage self-diagnosis system including a control valve for controlling a fluid flow rate and a pressure of a fluid facility, An opening / closing detection sensor 100; A stem (200) reciprocating up and down in the control valve and serving to open and close a flow path; A fluid leakage detection sensor 300 installed inside the stem 200 for detecting a phenomenon occurring when a fluid is leaked; And a control unit connected to the opening / closing detection sensor (100) and the fluid leakage detection sensor (300), and based on signals obtained from the opening / closing detection sensor (100) and the fluid leakage detection sensor (300) And a controller (900) for determining the level.

The fluid leakage detection sensor 300 is one or more sensors selected from a vibration sensor, an acoustic sensor, a sound sensor, and a sound velocity sensor.

The fluid leakage detection sensor 300 may include a vibration sensor 310 and an acoustic sensor 320.

When the control unit 900 determines that the flow path is opened by the opening / closing detection sensor 100, the control unit 900 stops the fluid leakage detection sensor 300 and the flow path is closed by the opening / closing detection sensor 100 And activates the fluid leakage detection sensor 300 when it is confirmed.

The stem 200 has a columnar elongated hole 210 formed therein in a vertical direction and a sensing space 220 is formed at a lower end of the elongated hole 210, The leakage self-diagnosis system includes a sensor driver 400 connected to the fluid leakage sensor 300 to reciprocate the fluid leakage sensor 300. The controller 900 controls the fluid leakage sensor 300, The control unit 300 sends a control signal to the sensor driving unit 400 so that the fluid leakage detection sensor 300 is inserted into the elongated hole 210 when the fluid leakage detection sensor 300 is stopped, And sends a control signal to the sensor driving unit 400 so that the sensing sensor 300 is positioned below the sensing space 220.

The sensor driving unit 400 is provided in the elongated hole 210 to move upward when the fluid leakage detection sensor 300 is stopped and to move upward and downward when the fluid leakage detection sensor 300 is stopped A pipe 410 reciprocating at a lower end thereof and contacting the upper surface of the fluid leakage sensor 300; The fluid leakage detection sensor 300 is provided inside the pipe 410 to move upward when the fluid leakage detection sensor 300 stops and to reciprocate upward and downward when the fluid leakage detection sensor 300 stops, A tension wire 420 connected to the leakage detection sensor 300; And a wire 430 which is provided inside the pipe 410 and is electrically connected to the fluid leakage detection sensor 300 and the control unit 900.

In addition, the fluid leakage self-diagnosis system may include a display unit 700 for displaying one or a plurality of control valve state information selected from among a control valve opening state, a fluid leakage state at the time of closing the control valve, and a fluid leakage level at the time of closing the control valve .

According to an embodiment of the present invention, there is provided a fluid leakage self-diagnosis system in which, in an apparatus operated using a fluid (water, oil, steam, etc.) It is possible to diagnose the leakage of the fluid in the closed state of the control valve based on the measurement values of the vibration noise and the like measured through the fluid leakage detection sensor installed in the inside.

In addition, by installing a fluid leakage sensor inside the stem, the fluid leakage sensor can be located at a position as close as possible to the position where the fluid leakage occurs, thereby more accurately detecting the fluid leakage, and at the same time, There is an effect that the detection sensor can be protected.

Also, by using a fluid leakage sensor equipped with a vibration sensor and an acoustic sensor, it is possible to confirm that the fluid is leaked only when the vibration condition and the acoustic condition generated by the fluid leakage are satisfied, It is possible to judge the leakage of the gas.

In addition, when the fluid leakage detection sensor is stopped when the flow path of the control valve is opened and the fluid leakage detection sensor is operated when the flow path of the control valve is closed, the power required to operate the fluid leakage detection sensor is minimized, Thereby maximizing the service life of the battery.

In addition, when the fluid leakage detection sensor is operated, the fluid leakage detection sensor is located at the lower part of the detection space by the sensor driving unit, thereby detecting the fluid leakage more accurately by positioning the fluid leakage detection sensor as close as possible to the position where the fluid leakage occurs There is an effect that can be done.

In addition, when the fluid leakage detection sensor is stopped, the fluid leakage detection sensor is inserted into the long hole by the sensor driving unit, thereby protecting the fluid leakage detection sensor.

In addition, since the sensor driving unit includes the pipe, the tension wire, and the electric wire, there is an effect that the fluid leakage detection sensor can be moved more easily.

Further, the pipe moves the fluid leakage detection sensor to the lower side and then moves to the upper side again, so that the pipe is separated from the fluid leakage detection sensor, so that the vibration of the fluid leakage detection sensor And the influence of the sound and the like is minimized, it is possible to more accurately detect the fluid leakage.

In addition, by providing the display portion for confirming the control valve state information, there is an effect that prompt action can be taken when a problem occurs.

1 shows a concept of a fluid leakage self-diagnosis system according to an embodiment of the present invention;
2 is a view showing a concept in which a fluid leakage detection sensor is installed inside a stem of a fluid leakage self-diagnosis system according to an embodiment of the present invention.
Fig. 3 is a view showing the inside of the stem of Fig. 2; Fig.
FIG. 4 is a detailed view of a sensor drive installed inside a stem of a fluid leakage self-diagnosis system according to an embodiment of the present invention and a state in which the fluid leakage detection sensor is stopped. FIG.
FIG. 5 is a detailed view of a sensor drive installed inside a stem of a fluid leakage self-diagnosis system according to an embodiment of the present invention and a state in which a fluid leakage detection sensor is operating. FIG.
FIG. 6 is a view showing a concept of a fluid leakage self-diagnosis system according to another embodiment of the present invention; FIG.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term "comprises" or "having ", etc. is intended to specify the presence of stated features, integers, steps, operations, elements, parts, or combinations thereof, And does not preclude the presence or addition of one or more other features, integers, integers, steps, operations, elements, components, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be construed as ideal or overly formal in meaning unless explicitly defined in the present application Do not.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concept of the term appropriately in order to describe its own invention in the best way. The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. Further, it is to be understood that, unless otherwise defined, technical terms and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Descriptions of known functions and configurations that may be unnecessarily blurred are omitted. The following drawings are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms. In addition, like reference numerals designate like elements throughout the specification. It is to be noted that the same elements among the drawings are denoted by the same reference numerals whenever possible.

FIG. 1 is a view showing a concept of a fluid leakage self-diagnosis system according to an embodiment of the present invention. FIG. 2 is a conceptual diagram showing a fluid leakage detection sensor installed inside a stem of a fluid leakage self- FIG. 3 is a view showing the inside of the stem of FIG. 2, FIG. 4 is a detailed example of sensor driving provided inside the stem of the fluid leakage self-diagnosis system according to an embodiment of the present invention, FIG. 5 is a view showing a detailed example of the sensor drive installed inside the stem of the fluid leakage self-diagnosis system according to the embodiment of the present invention and a state in which the fluid leakage detection sensor is in operation, and FIG. 6 is a view showing a concept of a fluid leakage self-diagnosis system according to another embodiment of the present invention.

1, a fluid leakage self-diagnosis system according to an embodiment of the present invention includes an opening / closing detection sensor 100, a stem 200, a fluid leakage detection sensor 300, and a control unit 900.

The opening / closing detection sensor 100 is installed in a control valve for controlling the fluid flow rate and the pressure of the facility using the fluid to detect whether the flow path is opened or closed.

As the opening / closing detection sensor 100, a limit switch or the like may be used.

When the limit switch is used as the opening / closing detection sensor 100, a part of the stem 200 may be protruded, and a limit switch may be provided so that the protruding portion can press the limit switch when the valve is closed.

That is, when a signal is generated by the contact of the limit switch, it can be judged that the flow path of the control valve is closed (closed). If the contact of the limit switch is disconnected and no signal is generated, .

The stem (200) reciprocates up and down in the control valve and serves to open and close the flow path.

The stem 200 refers to a valve stem. A power unit for moving a plug (a valve for opening and closing a flow path) of a control valve using electricity and pneumatic pressure is referred to as a driver. The control valve is provided inside the actuator and performs a reciprocating motion while the other end is provided in the control valve, thereby opening and closing the flow path of the control valve.

At this time, a plug can be connected to the lower part of the stem 200, and the seat ring can be fixed to the orifice area of the control valve (refer to FIGS. 2 to 3).

This is to allow the seat ring and the plug to seal the orifice area of the control valve and to close the flow passage when the seat ring and plug seal the orifice area of the control valve.

The fluid leakage detection sensor 300 is installed inside the stem 200 and detects a phenomenon occurring when the fluid leakage occurs.

That is, the fluid leakage detection sensor 300 is installed inside the stem 200 so that the fluid passing through the control valve can not flow into the fluid leakage detection sensor 300 side.

The phenomenon that occurs when the fluid leaks includes vibration and sound.

The control unit 900 is connected to the opening / closing detection sensor 100 and the fluid leakage detection sensor 300 and detects a fluid leakage based on signals obtained from the opening / closing detection sensor 100 and the fluid leakage detection sensor 300 And the fluid leakage level.

The fluid leakage level is an indicator that a worker (driver, manager, etc.) can grasp the degree of fluid leakage.

The fluid leakage detection sensor 300 of the fluid leakage self-diagnosis system according to an embodiment of the present invention may be one or a plurality of sensors selected from a vibration sensor, an acoustic sensor, a sound sensor, and a sound velocity sensor.

A vibration sensor is a sensor that detects vibration of mechanical structures, moving objects, etc., and can detect vibration by a piezoelectric acceleration method, a cantilever vibration method, or the like. That is, the fluid leakage can be detected by sensing the vibration generated when the fluid is leaked.

The acoustic sensor senses the sound generated when the fluid leaks and can detect the leakage of the fluid.

The sound wave sensor can detect the leakage of the fluid by detecting the sound wave generated when the fluid is leaked.

The sonic sensor can detect the leakage of the fluid by detecting the sound velocity generated when the fluid is leaked.

2, the fluid leakage detection sensor 300 of the fluid leakage self-diagnosis system according to an embodiment of the present invention may include a vibration sensor 310 and an acoustic sensor 320 .

The reason why the vibration sensor 310 and the acoustic sensor 320 are installed at the same time is that there is room for mistaking fluid leakage when only one sensor is installed.

For example, when only a vibration sensor is installed, vibration caused by an external shock or an earthquake may be mistaken as leakage of a fluid. If only an acoustic sensor is installed, external noise may be misinterpreted as fluid leakage.

Therefore, if it is confirmed that the fluid is leaked only when both the vibration condition and the acoustic condition generated by the leakage of the fluid are satisfied, it is possible to more accurately determine the leakage of the fluid.

The technology of detecting the leakage of the fluid through the use of the acoustic sensor is based on whether the internal leakage through the valve seat of the closed valve occurs or not when the movement of the stem 200 can not be observed directly, Whether or not there is packing or external leakage from a valve that is inaccessible during operation, positioning of the valve, and whether the check valve is operating properly.

The sound produced when a fluid leaks from a valve is detected when there is a pressure drop in the valve, a degassing of a liquid, or a cavitation caused by a pressure drop due to leakage. Flashing of Liquid to Vapor '. Cavitation is the formation of a vacuum in the liquid by a breakdown of the liquid or by a pressure drop below the vapor pressure of any gas dissolved in the liquid. The formation of the vacuum and the subsequent decline of the vacuum produce acoustic signals but produce larger amplitude noise at the time of vacuum decay. The formation and decline of this vacuum is individual (separate) and is identified as intermittent (intermittent) rupture in the background or in the leakage noise.

Another source of acoustic emissions associated with fluid leakage is the sudden fluid expansion due to pressure drop as the fluid exits the system. Generally, the gas flow is much more compressible than the liquid at a given pressure difference, so the gas flow produces a much higher level of sound than the liquid flow. Other factors that affect the generation of sound include leakage paths, and materials through which leakage occurs.

The amplitude of the acoustic signal, on the other hand, is related to the differential pressure across the leak. The larger the differential pressure, the larger the amplitude of the acoustic signal. The amplitude of the acoustic signal is generally directly proportional to the leakage rate and is inversely proportional to the viscosity.

Acoustic signals generated by fluid leakage span a wide band from 10 Hz to several hundred KHz.

The control unit 900 of the fluid leakage self-diagnosis system according to an embodiment of the present invention stops the fluid leakage detection sensor 300 when it is determined that the flow path is opened by the opening / closing detection sensor 100, And activates the fluid leakage detection sensor 300 when it is confirmed that the flow path is closed by the sensor 100.

Since the valve is opened to allow the fluid to flow in the state in which the flow path of the control valve is opened (valve open state), it is not necessary to determine whether the fluid is present or not, ,

It is preferable that the fluid leakage detection sensor 300 is operated because it is preferable that the fluid leakage does not occur when the flow passage of the control valve is closed (valve closed state).

This is to maximize the life of the fluid leakage sensor 300 while minimizing the power required to operate the fluid leakage sensor 300.

2, the fluid leakage self-diagnosis system according to an embodiment of the present invention includes a sensor driving unit 400 (FIG. 2) connected to the fluid leakage detection sensor 300 to reciprocate the fluid leakage detection sensor 300 up and down ).

When the valve is closed, the fluid leakage sensor 300 may be moved to the lower end of the stem 200 to diagnose the presence or absence of fluid leakage.

In order to accurately detect vibrations, sounds, and the like generated when the fluid leakage sensor 300 detects the fluid leakage, it is preferable that the fluid leakage detection sensor 300 is close to a position where the fluid leaks. Therefore, when the fluid leakage detection sensor 300 senses the fluid, the fluid leakage detection sensor 300 can approach the fluid leakage position using the sensor driving unit 400.

3, the stem 200 has a columnar elongated hole 210 formed therein in a vertical direction, and a sensing space 220 having a predetermined area is formed at a lower end of the elongated hole 210 . ≪ / RTI >

That is, it is possible to process the stem 200 to generate the elongated hole 210 and the sensing space 220, and the fluid leakage sensor 300 may be installed inside the stem 200.

The controller 900 sends a control signal to the sensor driver 400 so that the fluid leakage sensor 300 is inserted into the elongated hole 210 when the fluid leakage sensor 300 stops, A control signal may be sent to the sensor driver 400 so that the fluid leakage sensor 300 is positioned below the sensing space 220 when the leakage sensor 300 is operated.

When the fluid leakage detection sensor 300 is operated, the fluid leakage detection sensor 300 may be closely attached to the lower portion of the sensing space 220. This is for further facilitating the detection of external vibration and the like (refer to FIG. 5).

The control unit 900 sends a signal for opening and closing the valve to the positioner and sends a signal (sensing stop signal) for inserting the fluid leakage sensor 300 into the elongated hole 210 to the sensor driving unit 400 .

The fluid leakage sensor 300 may be positioned under the sensing space 220 when the flow passage of the control valve is closed from the opening / closing sensor 100 (for example, a limit switch signal is input) Signal (sensing activity signal) to the sensor driver 400. [

Here, the positioner is a device for precisely controlling the control valve, and is a pneumatic operation device having a proportional relationship between an input and an output.

The positioner can control the pressure supplied to the actuator by process control that changes the flow rate of energy or raw material proportional to the control signal for opening and closing the flow path of the control valve.

That is, according to the pressure supplied to the driver by the positioner, the stem 200 is moved upward to open the flow path of the control valve, or the stem 200 is moved downward to close the flow path of the control valve .

4 to 5, the sensor driver 400 of the fluid leakage self-diagnosis system according to an embodiment of the present invention may include a pipe 410, a tension wire 420 and a wire 430 have.

The pipe 410 is provided inside the elongated hole 210 to move upward when the fluid leakage detection sensor 300 is stopped and to reciprocate up and down when the fluid leakage detection sensor 300 stops, And the lower end thereof abuts against the upper surface of the fluid leakage detection sensor 300.

The pipe 410 may be a steel pipe and pushes the fluid leakage sensor 300 downward.

That is, the pipe 410 is moved downward so that the fluid leakage sensor 300 is positioned below the sensing space 220, and the fluid leakage sensor (not shown) 300 can be pushed as shown in Fig.

At this time, the pipe 410 moves the fluid leakage sensor 300 downward, and then moves upward to separate the pipe 410 from the fluid leakage detection sensor 300.

This is to minimize the influence of vibration, sound, and the like other than vibration, sound, and the like generated when the fluid leakage sensor 300 is leaked.

The tension wire 420 is provided inside the pipe 410 to move upward when the fluid leakage detection sensor 300 is stopped and to reciprocate upward and downward when the fluid leakage detection sensor 300 stops , And one end of which is connected to the fluid leakage detection sensor (300).

The tension wire 420 may use a steel wire, and may lift up the fluid leakage sensor 300 to be inserted into the elongated hole 210.

That is, the tension wire 420 is rolled up (moved upward) so that the fluid leakage detection sensor 300 is inserted into the elongated hole 210, The leakage detection sensor 300 may be inserted into the elongated hole 210 as shown in FIG.

This is to protect the fluid leakage sensor 300 from an impact or the like generated by the flow of the fluid by opening the flow path of the control valve.

The electric wire 430 is provided inside the pipe 410 and is electrically connected to the fluid leakage detection sensor 300 and the controller 900.

The electric line 430 may be a power line for supplying power to the fluid leakage sensor 300 and a signal line for transmitting a signal sensed by the fluid leakage sensor 300.

6, the fluid leakage self-diagnosis system according to the embodiment of the present invention is configured to detect the fluid leakage at the time of opening / closing of the control valve, the presence / absence of fluid leakage at the time of closing the control valve (closed) And a display unit 700 for displaying the selected one or plurality of control valve state information.

This makes it possible for the valve operator to visually confirm the state of the control valve such as the control valve opening / closing state, the fluid leakage at the time of closing (closing) the control valve, and the fluid leakage level at the time of closing (closing) the control valve. So that prompt action can be taken.

For this purpose, a signal obtained from the fluid leakage detection sensor 300 is collected at the time of occurrence of a fluid leakage, and an algorithm capable of determining the presence / absence of fluid leakage is passed through the analyzer, May be displayed on the display unit 700.

The algorithm for analyzing the fluid leak used in the analyzer compares the information of the database (such as a matching table) with which fluid leakage can be determined, according to the open / close state of the control valve and the signal obtained from the fluid leakage sensor 300 To determine the fluid leak / non-leak and the fluid leak level, and output it to the driver.

In the present invention, it is possible to check the disc position only, and the valve opening degree can be recognized by the positioner bar. However, in the present invention, And the display unit 700 for confirming the state of the control valve can be provided outside the actuator, so that the valve driver can visually confirm the control valve state information with the naked eye.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: Opening / closing sensor
200: Stem
210:
220: Detection space
310: Vibration sensor 320: Acoustic sensor
300: Fluid leakage detection sensor
400:
410: pipe 420: tension wire
430: Wires
700:
900:

Claims (7)

An opening / closing sensor (100) installed on a control valve for controlling the fluid flow rate and pressure of the facility operated by using the fluid and detecting whether the flow path is opened or closed;
A stem (200) reciprocating up and down in the control valve and serving to open and close a flow path;
A fluid leakage detection sensor 300 installed inside the stem 200 for detecting a phenomenon occurring when a fluid is leaked; And
The control unit 300 is connected to the opening / closing detection sensor 100 and the fluid leakage detection sensor 300 and detects the presence / absence of a fluid leakage and a fluid leakage level based on signals obtained from the opening / closing detection sensor 100 and the fluid leakage detection sensor 300 A control unit 900 for determining whether or not the vehicle is traveling on the road.
/ RTI >
The fluid leakage detection sensor (300)
A vibration sensor 310 and an acoustic sensor 320,
The control unit 900
If it is determined that the flow path is closed by the opening / closing detection sensor 100, the fluid leakage detection sensor 300 is stopped. If it is determined that the flow path is closed by the opening / closing detection sensor 100, 300) is operated,
The stem (200)
And a sensing space 220 is formed at a lower end of the elongated hole 210. In this case,
The fluid leakage self-diagnosis system
A sensor driver 400 connected to the fluid leakage sensor 300 to reciprocate the fluid leakage sensor 300 up and down;
Lt; / RTI >
The control unit 900
A control signal is sent to the sensor driving unit 400 so that the fluid leakage detection sensor 300 is inserted into the elongated hole 210 when the fluid leakage detection sensor 300 is stopped,
Wherein the control unit sends a control signal to the sensor driver (400) so that the fluid leakage sensor (300) is positioned below the sensing space (220) when the fluid leakage sensor (300) system.
The method according to claim 1,
The fluid leakage detection sensor (300)
Wherein the sensor is one or more sensors selected from a vibration sensor, an acoustic sensor, a sound sensor, and a sound velocity sensor.
delete delete delete The method according to claim 1,
The sensor driver 400
The fluid leakage detection sensor 300 is provided inside the elongated hole 210 to move upward when the fluid leakage detection sensor 300 stops and to reciprocate upward and downward when the fluid leakage detection sensor 300 stops, A pipe 410 contacting the upper surface of the leakage sensor 300;
The fluid leakage detection sensor 300 is provided inside the pipe 410 to move upward when the fluid leakage detection sensor 300 stops and to reciprocate upward and downward when the fluid leakage detection sensor 300 stops, A tension wire 420 connected to the leakage detection sensor 300; And
A wire 430 provided inside the pipe 410 and electrically connected to the fluid leakage sensor 300 and the controller 900;
The fluid leakage self-diagnosis system comprising:
The method according to claim 1,
The fluid leakage self-diagnosis system
A display unit 700 for displaying one or a plurality of control valve state information selected from the open / closed state of the control valve, the fluid leakage at the time of closing the control valve, and the fluid leakage level at the time of closing the control valve;
The fluid leakage self-diagnosis system comprising:

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