KR20220162027A - Valve system with self-diagnosis of valve satatus - Google Patents

Abstract

An objective of the present invention is to provide a valve system for self-diagnosing a valve state in which a user can manage a valve in a more optimal state. The valve system for self-diagnosing a valve state comprises: a valve having a flow path; a pneumatic actuator which opens and closes the flow path in the valve by moving a stem up and down with a diaphragm or a piston by the pressure of the supplied fluid; and a sensor unit including at least one selected from a group consisting of a pressure sensor, a density sensor, a humidity sensor, and a temperature sensor, in order to detect breakage of the diaphragm or piston and leakage of the valve, wherein the sensor unit is installed at one side of a second region which is the opposite side of a first region where the fluid is supplied among regions partitioned by the diaphragm or the piston.

Description

Valve status self-diagnosis valve system {VALVE SYSTEM WITH SELF-DIAGNOSIS OF VALVE SATATUS}

The present invention relates to a valve system for self-diagnosing valve conditions, and more particularly, includes one or more sensors to determine whether a valve is abnormal, and obtains correction sensor data obtained by removing a change value due to the operation of a stem from initial sensor data , It is a valve state self-diagnosis valve system in which the user can manage the valve in a more optimal state by notifying the user of the abnormality with the correction sensor data.

In the present invention, a valve having a flow path and a pneumatic actuator capable of opening and closing the flow path are installed as one, and a stem connected to a diaphragm or a piston inside the pneumatic actuator can open and close the flow path within the valve. In addition, it refers to a type in which a sensor is attached to help determine whether or not the installed valve is out of order.

At this time, in order to determine damage to the diaphragm or piston or leakage of the valve, it determines and informs whether the valve and pneumatic actuator are abnormal through the data obtained through the installed sensor.

However, in the conventional apparatus, it is difficult to distinguish whether the changes in pressure and density are due to the movement of the stem or the effect of the temperature change of the gas trapped in the valve chamber.

Republic of Korea Patent Publication No. 10-2021-0021036

The present invention is to solve the conventional problem, and includes one or more sensors to determine whether a valve is abnormal, obtains correction sensor data obtained by removing a change value caused by the operation of a stem from initial sensor data, and obtains correction sensor data. Its purpose is to provide a valve state self-diagnosis valve system in which the user can manage the valve in a more optimal state by notifying the user of an abnormality.

The object of the present invention is not limited thereto, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

The self-diagnosis valve system for achieving the object of the present invention as described above is a valve having a flow path and a pneumatic actuator that opens and closes the flow path in the valve by moving the stem up and down with a diaphragm or a piston by the pressure of the supplied fluid. and a sensor unit including at least one selected from the group consisting of a pressure sensor, a density sensor, a humidity sensor, and a temperature sensor to detect breakage of the diaphragm or piston and leakage of the valve, wherein the sensor unit includes the diaphragm It is installed on one side of the second area, which is opposite to the first area where the fluid is provided, among the areas partitioned by the frame or the piston.

At this time, the pneumatic actuator includes an input port through which air pressure is input and an output port through which air pressure is output, and the sensor unit is installed at the output port to detect whether air pressure is leaked.

In addition, the sensor unit includes a pressure sensor and a density sensor, initially continuously measures and calculates an average value of sensor data, continuously measures and calculates a data change value as the stem moves, and from the average value of the sensor data When the correction sensor data calculated by removing the data change value is out of a preset range, damage of the diaphragm or piston and leakage of the valve may be warned.

In addition, including a control unit connected to the sensor unit and receiving sensor data, the control unit includes a short-range wireless communication chip of at least one of an NFC or RFID tag to store the sensor data and when a user terminal approaches The data can be transmitted.

In addition, when an abnormality is detected by the sensor unit, an alarm may be generated through an audio device or a lighting device installed in the pneumatic actuator.

In addition, a display unit installed outside the pneumatic actuator to indicate an open/closed state of the valve is further included, and the display unit is integrally formed with the stem to visually inform a user of the open/closed state of the valve according to the movement of the stem. can provide

The self-diagnosing valve system according to the present invention has the following effects.

First, there is an effect of reducing an error as to whether or not the valve is abnormal with correction sensor data obtained while removing noise by considering the range of pressure change according to the movement of the stem and the expansion rate according to the change in room temperature.

Second, when an abnormality is detected, an alarm is generated through an audio device or a lighting device installed in the pneumatic actuator, and the abnormal state is quickly communicated to the user or manager, thereby enabling management in a more optimal state.

Third, by storing sensor data in a control unit containing at least one short-range wireless communication chip of NFC or RFID tag and transmitting the data when the user's terminal approaches, the user can manage it in a more optimal state. have.

Fourth, by installing a display unit installed outside the pneumatic actuator to indicate the open/closed state of the valve, visually providing the user with open/closed information of the valve, there is an effect that can be managed in a more optimal state.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention serve to further understand the technical idea of the present invention, the present invention is limited only to those described in the drawings. and should not be interpreted.
1 is a cross-sectional view of a diaphragm in a pneumatic actuator according to the present invention; and
2 is a cross-sectional view of a piston in a pneumatic actuator according to the present invention.

Advantages and features of the present invention and methods of achieving them will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments make the disclosure of the present invention complete, and those skilled in the art to which the present invention belongs It is provided to fully inform the scope of the present invention, the present invention is defined only by the scope of the claims.

Terms used herein are for describing the embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless otherwise specified in the phrase. As used herein, "comprises" and/or "comprising" does not exclude the presence or addition of one or more other elements other than the recited elements. Like reference numerals throughout the specification refer to like elements, and “and/or” includes each and every combination of one or more of the recited elements. Although "first", "second", etc. are used to describe various components, these components are not limited by these terms, of course. These terms are only used to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may also be the second component within the technical spirit of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings commonly understood by those skilled in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Composition of self-diagnosis valve system

1 is a cross-sectional view of a diaphragm of a pneumatic actuator according to the present invention, and FIG. 2 is a cross-sectional view of a piston of a pneumatic actuator according to the present invention.

As shown in FIGS. 1 and 2 , the valve system for self-diagnosing valve status according to the present invention is largely composed of a valve 1, a pneumatic actuator 2, and a sensor unit 30.

The valve 1 is composed of a flow path 3 and a stem 11.

The flow passage 3 is provided as a pipe through which fluid can move.

At this time, the shape of the flow path 3 may be formed in various shapes and sizes in consideration of the usage mode and the like.

The stem 11 is provided to open and close the flow path 3 by passing through a hole on one side of the upper portion of the flow path 3 in order to allow fluid to flow through the flow path 3, to stop, or to control the flow rate. The stem 11 is coupled to one side of the lower surface of the diaphragm 4 or piston 5 of the pneumatic actuator 2.

At this time, the stem 11 may open and close the passage 11 through vertical movement.

As shown in FIGS. 1 and 2, the valve 1 is configured in common, but may be formed in various shapes and sizes in consideration of usage conditions and the like.

The pneumatic actuator 2 includes a diaphragm 4 or a piston 5 depending on the usage.

The pneumatic actuator 2 is provided on one side of the valve 1, preferably on one side of the upper part of the valve 1 corresponding to the one side where the stem 11 is provided to operate the stem 11, as shown in FIG. As such, in one embodiment, the pneumatic actuator 2 using the diaphragm 4 is largely composed of a housing 13, a diaphragm 4, and a spring 11a.

The housing 13 is provided on one side of the upper portion of the valve 1 and provides a space in which the diaphragm 4 and the spring 11a can be configured. No matter what size it is made. In the present invention, as shown in FIG. 1, it is composed of an upper housing (2a) and a lower housing (2b) in which the inner space is partitioned through the diaphragm (4).

The upper housing 2a forms the upper region of the housing 13, and its shape may be formed in various forms in consideration of the overall shape of the housing 13. In the present invention, the housing 13 is shown as forming a hexagonal cross section as a whole, but may be selectively determined to have a hemispherical or polygonal cross section depending on the usage mode.

In addition, an open working fluid supply source 10 is formed on one side of the upper housing 2a, preferably on one side of the upper surface, more preferably on one side of the center of the upper surface, so that the working fluid can be input and output.

At this time, a stopper 10a is placed on one side of the working fluid supply source 10, preferably on one side of the surface where the diaphragm 4 and the upper housing 2a come into contact when the diaphragm 4 rises, so that the diaphragm 4 When it rises, it helps to prevent damage to the diaphragm 4 in advance by avoiding contact with the upper housing 2a. Depending on the usage mode, other than the stopper 10a, any member may be used as long as it prevents contact between the diaphragm 4 and the upper housing 2a and does not damage the diaphragm 4.

The lower housing 2b has a size and shape corresponding to that of the upper housing 2a, and is coupled to the upper housing 2a so that components such as the diaphragm 4 and the spring 11a can be combined therein. provides

At this time, a through hole is formed on one side of the lower housing 2b, preferably on one side of the bottom surface of the lower housing 2b corresponding to the stem 11.

As described above, the inner region of the housing 13 composed of the upper housing 2a and the lower housing 2b is separated through a diaphragm 4 described later to form an upper region formed through the upper housing 2a. A lower area formed through the first area 20 and the lower housing 2b will be referred to as a second area 21 .

The diaphragm 4 divides the inner area of the housing 13 around one side of the inside of the housing 13, preferably a joint between the upper housing 2a and the lower housing 2b, and the upper housing 2a It is a device that expands downward by the pressure of the fluid supplied through the working fluid supply source 10 and lowers the stem 11. The diaphragm 4 is an elastic thin plate-shaped partition and is provided on one side between the upper housing 2a and the lower housing 2b. The provided diaphragm 4 serves as an O-ring at the connection between the upper housing 2a and the lower housing 2b to prevent leakage of the working fluid supplied therein. In addition to the diaphragm 4, any device may be used as long as it can achieve this purpose.

In addition, a reinforcing member is further provided on the lower surface of the diaphragm 4 to which the spring 11a is coupled to prevent direct contact between the spring 11a and the diaphragm 4, thereby preventing damage to the diaphragm 4. makes it possible to prevent The reinforcing member is not specified as anything, and can be selectively determined if it is for the purpose of preventing damage to the diaphragm 4.

At this time, the stem 11 passes through the through-hole of the lower housing 2b and is coupled to one side of the lower surface of the diaphragm 4, and descends or rises by the expansion and contraction of the diaphragm 4 and the passage of the valve 1 (3) is configured to be closed or opened.

The spring 11a is provided to surround the outer circumferential surface of the stem 11 between the bottom surface of the diaphragm 4 and the lower housing 2b, and is provided in the second area 21 opposite to the area where the fluid is supplied. . Here, the spring (11a) is a device that assists the restoration of the diaphragm (4). Depending on the mode of use, any device can be used as long as it can restore the diaphragm 4 upward when the air pressure that presses the diaphragm 4 downward, in addition to the spring 11a, is removed, preferably. Preferably, an elastic member such as an elastic device or rubber, and more preferably, a coil spring is used.

The pneumatic actuator 2 according to the present invention checks the operating state of the lower bulkhead housing 12 and the stem 11 to secure more operating space for the stem 11 in order to more smoothly move the stem 11 up and down. In order to do so, a position indicator 11b may be further provided on one side of the inner side of the lower bulkhead housing 12 .

The lower bulkhead housing 12 is provided between the valve 1 and the housing 13, preferably between the valve 1 and the lower housing 2b, to secure an operating space for the stem 11 and at the same time position indicator 11b. ) is a device that provides a space for insertion. A through hole is formed at one central side of each of the upper and lower surfaces of the lower bulkhead housing 12 so that the stem 11 can pass therethrough.

At this time, by providing a space inside which the position indicator 11b and the scale 11c can be configured, in the present invention, the lower bulkhead housing 12 is shown as forming a hexagonal cross section as a whole, but depending on the usage mode It can be selectively determined to have a spherical or polygonal cross section according to

In addition, the lower bulkhead housing 12 includes at least a portion of the position indicator 11b and the scale 11c so that a user or manager can visually check the internal position indicator 11b and the scale 11c. It is preferable that the corresponding one side is made of a transparent material. It is obvious that the lower bulkhead housing 12 may be entirely made of a transparent material depending on usage conditions.

The position indicator 11b may be configured electronically or mechanically depending on the usage mode. The electronic type makes it possible to measure a positional change according to the elevation of the stem 11 through a position sensor on one side of the stem 11. In the mechanical type, the position indicator 11b and the scale part 11c indicated by the position indicator 11b can be moved according to the movement of the stem 11 to show the change in position.

In the present invention, a mechanical type is adopted and used, but it may be provided with an electronic type depending on the usage mode. The position indicator 11b in the present invention is provided with a position indicator 11b capable of indicating a scale on one side of the middle of the stem 11 so as to indicate the current position of the stem 11, and a corresponding lower bulkhead housing. A scale part 11c is provided on one side of the wall surface of (12) to show the position according to the movement of the stem 11.

At this time, the position indicator 11b indicating the scale on one side of the middle of the stem 11 or the scale part 11c on one side of the wall of the lower bulkhead housing 12 is not specifically determined, and is provided in various shapes and sizes depending on the usage It can be.

As shown in FIG. 2, in one embodiment, the pneumatic actuator 2 using the piston 5 is largely composed of a casing 14 and a piston 5.

The casing 14 provides a space in which the piston 5 and the stem 11 can be configured, and may be formed in any shape and size as long as this purpose can be achieved. In the present invention, as shown in FIG. 2, the casing 14 includes an upper casing 2c formed to surround the outer circumferential surface of the piston 5 and a lower casing 2d formed to surround the outer circumferential surface of the stem 11. It consists of In addition, when the casing 14 is coupled with the valve 1, an O-ring 6 is added to more closely couple it, and it is provided to prevent leakage of fluid.

The upper casing 2c forms the upper region of the casing 14, and its shape surrounds the outer circumferential surface of the piston 5, and is provided so that the outer circumferential surface of the piston 5 and the inner wall of the upper casing 2c are in close contact with the piston ( 5) is formed to secure sufficient space in providing a space capable of moving up and down. However, any shape may be used as long as the piston 5, including the piston 5, is in close contact with the upper casing 2c and secures a sufficient space that does not interfere with the vertical movement.

In addition, an open working fluid supply source 10 is formed on one side of the upper casing 2c, preferably on one side of the upper surface, so that the working fluid can be input and output.

The lower casing 2d is coupled to the upper casing 2c so as to be in close contact with each other and has a size and shape to cover the outer circumferential surface of the stem 11 therein, and is provided to be in close contact with the stem 11 so that the top and bottom of the stem 11 It provides a space that does not impede movement. However, any shape may be used as long as the stem 11, including the stem 11, is in close contact with the lower casing 2d and secures a sufficient space not to interfere with the vertical movement.

In addition, in coupling the upper casing 2c and the lower casing 2d, a yoke or bonnet 40 is used to more closely couple them.

As described above, the inner region of the casing 14 composed of the upper casing 2c and the lower casing 2d is the first region 20 of the upper region of the piston 5 separated through the piston 5 described later. ), and the lower region of the piston 5 is referred to as the second region 21 .

The piston 5 is the side wall surface of the upper casing 2c to maintain airtightness between the inside of the pneumatic actuator 2, preferably between the first area 20 and the second area 21 under the pressure of the working fluid. It comes into contact with the inside and is coupled with the stem 11 to move up and down. The central one side of the piston 5 passes through the stem 11 and is closely coupled, and the central one side of the piston 5, preferably the central one side through which the stem 11 passes and is coupled, is provided in a bent shape. do.

At this time, the shape of the piston 5 is only an example for explaining what is shown in FIG. 2, and the shape of the piston 5 is not limited, and can move up and down by contacting the upper casing 2c and being coupled with the stem 11. It can be made in various shapes and sizes if it can achieve the purpose it has.

In addition, other than the piston 5, any device may be used as long as it can achieve this purpose.

As described above, the device including the configuration using the diaphragm 4 or the piston 5 as one embodiment of the pneumatic actuator 2 has been described, but this is only one embodiment and in addition to the stem 11 Any device may be used as long as it is a device capable of opening and closing the passage 3 by moving it up and down.

The sensor unit 30 includes at least one selected from the group consisting of a pressure sensor, a density sensor, a temperature sensor, and a humidity sensor. The sensor unit 30 is located on one side of the housing 13 or casing 14, preferably on one side of the lower housing 2b or lower casing 2d so as to measure the situation inside the second region 21. It is good to be provided. The installation location of the sensor unit 30 is not limited to the lower housing 2b or the lower casing 2d, but is provided in the upper housing 2a or the upper casing 2c or the upper housing 2a depending on the usage mode. Alternatively, it may be provided on both sides of the upper casing 2c and the lower housing 2b or the lower casing 2d.

At this time, when a plurality of sensors are used in the sensor unit 30, the plurality of sensors may be provided to be concentrated on one side adjacent to each other, or may be provided to be spaced apart from each other by a certain distance or a certain angle or more. It can be arranged in various ways considering the size, capacity, shape, etc. of the valve 1 and the pneumatic actuator 2.

In addition, a display unit (not shown) formed integrally with the stem 11 and visually providing open/closed status information to a user or manager when the flow path 3 in the valve 1 is opened or closed through the up and down movement of the stem 11 may be additionally provided. Here, the display unit is installed on one side of the outside of the pneumatic actuator 2 and displays the current state of the passage in the valve 1 that is opened and closed as the stem 11 moves up and down. In addition, the shape of the display unit is not limited and may be selectively made according to the usage mode.

In addition, an audio device (not shown) or a lighting device (not shown) capable of generating an alarm to the user when an abnormality of the valve 1 or the pneumatic actuator 2 is detected is located on one side of the pneumatic actuator 2 outside. Additional may be provided. Here, the audio device or the lighting device is not limited and may be selectively made according to the usage mode.

In addition, a control unit (not shown) connected to the sensor unit 30 and receiving sensor data may be additionally provided. The control unit is provided on one side of the pneumatic actuator 2 or on one side adjacent to the pneumatic actuator 2 so as to be connected to the sensor unit 30 by wire or wirelessly and includes at least one short-range wireless communication chip of NFC or RFID tag. Alternatively, when the manager's terminal approaches, data is transmitted using a short-distance wireless communication chip.

Usage of self-diagnosis valve system

A use mode of the self-diagnosing valve system having the above configuration will be described in more detail with reference to the drawings. It is mentioned in advance that parts that are commonly known in describing the invention and are not greatly related to the invention are not described to prevent confusion in describing the present invention.

As shown in FIG. 1 as an embodiment, a detailed description of the use of the self-diagnosing valve system using a pneumatic actuator 2 having a diaphragm 4 is as follows.

In the pneumatic actuator 2 having the diaphragm 4, when the working fluid is input through the working fluid supply source 10, the pressure in the first region 20 increases through the input working fluid. As the first region 20 expands through the increased pressure, the diaphragm 4 descends. When the diaphragm 4 descends, the connected stem 11 also descends and closes the passage 3 in the valve 1. Here, the pressure is applied enough to press the spring 11a connected to the diaphragm 4, and the scale of the position indicator 11b provided on one side of the stem 11 also goes down. Shows the current position of the stem (11).

Conversely, when the working fluid is output through the working fluid supply source 10, the pressure in the first region 20 decreases and the diaphragm 4 rises. Here, the elevation of the diaphragm 4 is assisted through the spring 11a connected to the diaphragm 4.

In addition, when the diaphragm 4 rises, it rises only up to the stopper 10a to prevent damage to the diaphragm 4. When the diaphragm 4 rises, the connected stem 11 also rises, and the passage 3 in the valve 1 connected to the stem 11 is opened.

At this time, the scale of the position indicator 11b also rises to indicate the current position of the stem 11.

As another embodiment, as shown in FIG. 2 , the use of the valve state self-diagnosis valve system using the pneumatic actuator 2 using the piston 5 will be described in detail.

In the pneumatic actuator 2 having the piston 5, fluid is input through the working fluid supply source 10, the first region 20 expands with the increased pressure, and the piston 5 descends through the expansion. . When the piston 5 descends, the connected stem 11 also descends.

Here, the passage in the valve 1 connected to the stem 11 opposite to the diaphragm 4 is opened.

Conversely, when the working fluid is output, the pressure in the first region 20 is lowered, and the piston 5 rises through the lowered pressure. Here, the stem 11 connected to the piston 5 also rises. As the stem 11 rises, the passage in the valve 1 is closed.

At this time, the open/closed state of the flow path 3 in the current valve 1 can be displayed by a user or manager through a display unit that can be additionally provided.

1 and 2 in the present invention, although the opening and closing of the passage 3 according to the movement of the diaphragm 4 and the piston 5 is reversed in the use mode, an example for explaining the present invention It should be construed that it is possible to change according to the user's or administrator's use mode as a non-limiting one.

The sensor unit 30 includes a pressure sensor and a density sensor to detect breakage of the diaphragm 4 or piston 5, breakage of the O-ring 6, and leakage of the valve 1. The sensor unit 30 obtains initial sensor data values obtained by continuously measuring the pressure and density of the initial state of the second area 21 with a pressure sensor and a density sensor, and averages the initial sensor data values obtained to obtain an average value. .

In addition, by continuously measuring changes in pressure and density as the diaphragm 4, piston 5, or stem 11 moves, correction sensor data is obtained by subtracting them from the average value. If the correction sensor data is out of the preset range, a warning is given of damage to the diaphragm 4 or piston 5, damage to the O-ring 6, and leakage of the valve 1. Here, the preset range is regarded as a change of around 10%, and the user or manager may set the range of around 10% to the range of 5% to 15% or 0% to 20%.

In addition, a temperature sensor and a humidity sensor may be additionally provided to remove noise from the value of the corrected sensor data in order to obtain more accurate corrected sensor data. The above-mentioned noise refers to the expansion rate according to the change in temperature and humidity of the gas trapped in the second region 21 according to the movement of the diaphragm 4, piston 5, or stem 11. By removing noise from the calibrated sensor data, more accurate calibrated sensor data can be obtained.

When an abnormality signal occurs, a notification is sent to the user or administrator so that the user or administrator can check the abnormality in advance. This enables the user or administrator to more quickly respond to the determination of abnormalities and manage them in an optimal state.

For notifications sent to users or administrators, refer to the description below.

When an abnormal signal is generated, it notifies the user or manager visually or audibly through an audio device or lighting device that may be additionally provided, so that it can be managed in an optimal state by responding more quickly.

In addition, the control unit, which may be additionally provided, recognizes the user or administrator's access to the terminal through the provided short-range wireless communication chip and transmits the sensor data collected and stored in the sensor unit 30 to respond more quickly to an optimal state. allows you to manage

In the foregoing, it should be interpreted that it is possible to change according to the usage mode of the user or administrator as an example for explaining the present invention and not a limitation.

As described above, those skilled in the art to which the present invention pertains will understand that the present invention can be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, the foregoing should be understood as illustrative in all respects and not limiting. The scope of the present invention is indicated by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention.

1: valve
2: pneumatic actuator
2a: upper housing
2b: lower housing
2c: upper casing
2d: lower casing
3: Euro
4: diaphragm
5: Piston
6: O-ring
10: source of working fluid
10a: stopper
11: stem
11a: spring
11b: position indicator
11c: graduation part
12: lower bulkhead housing
13: housing
14: casing
20: first area
21: second area
30: sensor unit
40: yoke or bonnet

Claims (6)

A valve having a flow path;
a pneumatic actuator that opens and closes the passage in the valve by moving the stem up and down with a diaphragm or a piston by the pressure of the supplied fluid; and
A sensor unit including at least one selected from the group consisting of a pressure sensor, a density sensor, a humidity sensor, and a temperature sensor to detect damage of the diaphragm or piston and leakage of the valve;
The sensor unit is installed on one side of a second region, which is opposite to the first region where the fluid is supplied, among regions partitioned by the diaphragm or the piston. The method of claim 1,
The pneumatic actuator includes an input port through which air pressure is input and an output port through which air pressure is output,
The valve system self-diagnosis valve system, wherein the sensor unit is installed at the output port to detect whether or not air pressure is leaked. The method of claim 1,
The sensor unit includes a pressure sensor and a density sensor,
Initially, the correction sensor data calculated by continuously measuring and calculating the average value of sensor data, continuously measuring and calculating the data change value as the stem moves, and removing the data change value from the data average value is set in advance. A self-diagnostic valve system that warns of damage to the diaphragm or piston, damage to the O-ring, and leakage of the valve when out of range. The method of claim 1,
Including a control unit connected to the sensor unit and receiving sensor data,
The control unit includes a short-range wireless communication chip of at least one of an NFC or RFID tag to store the sensor data and to transmit the data when a user's terminal approaches. The method of claim 1,
When an abnormality is detected by the sensor unit,
A valve system for self-diagnosing valve status, which generates an alarm through an audio device or lighting device installed in the pneumatic actuator. The method of claim 1,
Further comprising a display unit installed outside the pneumatic actuator to indicate the open/closed state of the valve,
Wherein the display unit is integrally formed with the stem to visually provide information on the opening/closing state of the valve to a user according to the movement of the stem.

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