Check Valve

Abstract

The present invention relates to a check valve, and more specifically, to a check valve comprising a body portion having a space formed inside and a flow path formed therein, a disc portion rotatably supported inside the body portion, and an indicator portion provided on the outside of the body portion to indicate the open / closed state of the disc portion to the outside, thereby allowing the movement to be visually confirmed from the outside even when the disc is slightly opened or closed due to a minute leak, so as to prevent unexpected damage to piping facilities or serious leaks in advance.

Description

Technology Field

[0001] The present invention relates to a check valve, and more specifically, to a check valve comprising a body portion having a space formed inside and a flow path formed therein, a disc portion rotatably supported inside the body portion, and an indicator portion provided on the outside of the body portion to indicate the open / closed state of the disc portion to the outside, thereby allowing the movement to be visually confirmed from the outside even when the disc is slightly opened or closed due to a minute leak, so as to prevent unexpected damage to piping facilities or serious leaks in advance. Background Technology

[0002] Check valves are key components designed to prevent backflow in fluid piping systems and are widely used in various industrial sectors, including fire sprinklers, industrial process piping, water and sewage treatment facilities, and cooling water lines. Particularly in fire sprinkler systems, they play a crucial role in initial fire response by also functioning as alarm valves; they utilize limit switches to generate an alarm signal when water is released through sprinkler heads during a fire.

[0003] The check valve can operate automatically based on the pressure difference between the fluid at the upstream and downstream ends without a separate actuator. It has a structure in which the disc rotates or rises to open when the hydraulic pressure at the upstream end is higher than that at the downstream end, causing fluid to flow in the forward direction, and closes when the hydraulic pressure at the downstream end is equal to or higher than that at the upstream end, causing fluid to flow in the reverse direction. Thus, it functions to prevent backflow by allowing fluid flow in only one direction when installed in piping.

[0004] Conventional check valves can operate relatively accurately and send alarm signals in situations such as the discharge of water through sprinkler heads or excessive leakage in branch pipes as described above, but they have limitations in that when the amount of leakage is very small or localized changes in flow rate occur that do not reach the sprinkler, the disc does not open completely, so the switch does not operate, and consequently, no alarm or detection is made in the initial stage of leakage.

[0005] In particular, since the disc is located inside the valve and is not exposed to the outside, there was a structural limitation in that the open / closed status or degree of opening of the disc could not be visually checked unless a maintenance worker or manager disassembled the check valve. As a result, there were frequent cases where small leaks in branch pipes or sprinklers were left unnoticed for a long period, and if such leaks accumulated beyond a certain level, there was a problem that accidents resulting in sudden pipe rupture or massive water discharge occurred.

[0006] FIG. 1 is a drawing illustrating a conventional alarm valve for fire fighting equipment. Referring to FIG. 1, it can be seen that the clapper (110), which is configured to be openable and closed by a rotating shaft (112), has a gap between the upper and lower parts of the hinge hub that is coupled to the rotating shaft (112).

[0007] In this way, conventionally, to prepare for situations where the disc cannot completely block the inside of the pipe due to reasons that cannot be verified from the outside, such as assembly errors or foreign matter between the pipe and the disc, the check valve was configured in a way that leaves a gap between the hub of the disc arm to which the disc is connected and the hinge shaft.

[0008] In this structure, even if the disc moves slightly due to a minute change in flow rate at the downstream end of the check valve, the hinge shaft moves up, down, left, and right within the clearance between the shaft and the hub instead of rotating, so the movement of the disc is not transmitted to the outside.

[0009] Therefore, even if the disc is actually partially open and a minute leak is occurring, the hinge axis does not rotate, so from the outside, the disc appears to remain closed; consequently, it is difficult to detect signs of initial leakage or the open state at an early stage. This structural limitation not only makes it difficult to prevent leaks in the entire piping system but also significantly hinders the efficiency of maintenance in that the information available to the manager is limited.

[0010] Accordingly, there is a need to develop a check valve with a structure that allows the opening and closing rate of the disc inside the check valve to be directly checked from the outside and accurately detects the movement of the disc even at the stage of minute leakage, thereby preventing leakage or pipe rupture accidents in advance.

[0011] The technology forming the background of the present invention is disclosed in Korean Registered Patent No. 10-1904344. The problem to be solved

[0013] The present invention has been devised to solve the above-mentioned problems,

[0014] The objective of the present invention is to provide a check valve that prevents backflow by automatically opening and closing the disc according to the flow of fluid, by including a body portion having a space formed on the inside and a fluid path formed therein, and a disc portion rotatably supported on the inside of the body portion, which opens when fluid flows in the forward direction and closes when fluid flows in the reverse direction.

[0015] Another objective of the present invention is to provide a check valve that further includes an indicator portion provided on the outer side of the body portion, wherein the indicator portion is configured to allow visual confirmation of the open / closed state of the disc portion from the outside, thereby enabling easy confirmation of whether a leak has occurred in a pipe or sprinkler connected to the check valve.

[0016] Another objective of the present invention is to provide a check valve that is easy to maintain, wherein the disc portion comprises a disc arm that supports and rotates the disc, and a disc that is rotatably provided on one side of the disc arm to open and close the fluid path, so that the disc can be separated from and replaced with the disc arm in the event of damage to the disc.

[0017] Another objective of the present invention is to provide a check valve in which the disc arm is provided to be rotatable on the other side of the disc arm, thereby enabling the disc arm to rotate smoothly around a hinge axis when opening and closing the disc in response to a hydraulic pressure change within the check valve.

[0018] Another objective of the present invention is to provide a check valve in which the opening or closing status of the disc inside the check valve can be visually confirmed from the outside of the check valve, by including an indicator portion comprising a connecting shaft extending outwardly in the axial direction of the body portion and an indicator connected to the outside of the body portion and rotatably provided to indicate whether the disc is rotated.

[0019] Another objective of the present invention is to provide a check valve capable of remotely monitoring whether a leak has occurred in a pipe connected to the valve by detecting the open / closed state of the disc as an electrical signal, wherein the indicator part further includes a plate installed on the outer side of the body part, and the limit switch on the plate is further operated by the rotation of the indicator to generate an electrical signal.

[0020] Another objective of the present invention is to provide a check valve in which the indicator portion further comprises a shaft to which the indicator is attached, which is connected to the outside of the body portion and is rotatably configured, and the shaft comprises an insertion hole formed by being axially recessed along a central axis, and corresponding chamfered surfaces are formed on the inner surface of the insertion hole and the outer surface of the connecting shaft, respectively, so that the rotational force of the hinge shaft according to the opening and closing of the disc can be transmitted to the shaft through the connecting shaft.

[0021] Another objective of the present invention is to provide a check valve that allows for the quantitative verification of not only whether the disc part is open or closed but also the opening rate from the outside, by providing a scale on the plate that indicates the rotation angle of the indicator, thereby enabling the possibility of leakage in the piping to be checked in advance.

[0022] Another objective of the present invention is to provide a check valve that further includes a hinge shaft supported within the body portion, wherein the hinge shaft further includes a connecting hole formed by an axial recess along the central axis of the hinge shaft at one end, wherein the inner surface of the connecting hole is formed in a shape that is complementary to the outer surface of the connecting shaft, and wherein the connecting shaft is inserted and fastened into the connecting hole so as to accurately transmit the rotation of the hinge shaft to the connecting shaft, and wherein the hinge shaft and the connecting shaft are separable so as to facilitate maintenance in the event of damage to the connecting shaft or the shaft connected thereto.

[0023] Another objective of the present invention is to provide a check valve wherein the disc comprises a disc plate that closes a fluid passage when fluid flows backward, and a first guide and a second guide that are spaced apart and extend a predetermined height from the upper surface of the disc plate and face each other, and one side of the disc arm is disposed between the first guide and the second guide and is axially coupled by a disc shaft, so that when the disc closes the fluid passage, it moves slightly relative to the disc arm to be accurately seated on the valve seat, and even when fluid flows due to a slight leakage, the disc arm rotates to check whether the disc is open or closed through an indicator.

[0024] Another objective of the present invention is to provide a check valve in which the heights of the first guide and the second guide are formed to be higher than the height of the disc arm, thereby securing a space between the disc arm and the disc plate so that the disc can rotate within a predetermined range around the disc axis when the disc is opened or closed.

[0025] Another objective of the present invention is to provide a check valve that allows for a minute clearance between the disc and the disc shaft, thereby inducing stable closure of the disc even in the presence of assembly errors or foreign substances, by ensuring that the disc shaft is press-fitted into the shaft hole of the disc arm and that the inner diameter of the disc shaft holes formed in the first guide and the second guide is formed to be larger than the outer diameter of the disc shaft.

[0026] Another objective of the present invention is to provide a check valve capable of inducing stable closure of the disc even in the presence of assembly errors or foreign substances by allowing a minute clearance between the disc arm and the disc shaft, wherein the disc shaft is press-fitted into the disc shaft holes of the first guide and the second guide, and the inner diameter of the shaft hole formed in the disc arm is formed to be larger than the outer diameter of the disc shaft.

[0027] Another objective of the present invention is to provide a check valve that can improve watertightness by having the disc further include a sheet of elastic material provided on the lower part of the disc plate, thereby making close contact with the valve seat when the flow path is closed.

[0028] However, the technical problems that the embodiments of the present invention aim to solve are not limited to the technical problems described above, and other technical problems may exist. means of solving the problem

[0029] The present invention is implemented by an embodiment having the following configuration to achieve the aforementioned objective.

[0030] According to one embodiment of the present invention, the present invention may include a body portion having a space formed on the inside and a fluid path formed therein, a hinge shaft supported within the body portion, and a disk portion rotatably supported by the hinge shaft, which opens when fluid flows in the forward direction and closes when fluid flows in the reverse direction.

[0031] According to another embodiment of the present invention, the present invention further includes an indicator portion provided on the outer side of the body portion, and the indicator portion may be configured to allow visual confirmation of the open / closed state of the disk portion from the outside.

[0032] According to another embodiment of the present invention, the disk portion may include a disk arm that supports and rotates the disk, and a disk that is rotatably provided on one side of the disk arm to open and close the fluid passage.

[0033] According to another embodiment of the present invention, the disc arm may include an arm hub provided to be rotatable on the other side of the disc arm.

[0034] According to another embodiment of the present invention, the indicator portion may include a connecting shaft extending outwardly in the axial direction of the body portion and an indicator connected to the outside of the body portion and rotatably provided to indicate whether the disk is rotated.

[0035] According to another embodiment of the present invention, the indicator portion of the present invention further includes a plate installed on the outer side of the body portion, and the plate may include a limit switch that is actuated by the rotation of the indicator to generate an electrical signal.

[0036] According to another embodiment of the present invention, the indicator portion further comprises a shaft to which the indicator is attached, which is connected to the outside of the body portion and is rotatably provided, and the shaft comprises an insertion hole formed by being axially recessed along a central axis, and corresponding chamfered surfaces may be formed on the inner surface of the insertion hole and the outer surface of the connecting shaft, respectively.

[0037] According to another embodiment of the present invention, the plate may be provided with a scale indicating the rotation angle of the indicator.

[0038] According to another embodiment of the present invention, the present invention further includes a hinge shaft supported within the body portion, wherein the hinge shaft further includes a connecting hole formed by being axially recessed along the central axis line of the hinge shaft at one end, and the inner surface of the connecting hole is formed in a shape complementary to that corresponding to the outer surface of the connecting shaft, and the connecting shaft can be inserted and fastened into the connecting hole.

[0039] According to another embodiment of the present invention, the present invention comprises a disk plate that closes a fluid path when fluid flows backward, and a first guide and a second guide that are spaced apart and face each other and are formed to extend a predetermined height from the upper surface of the disk plate, and one side of the disk arm is disposed between the first guide and the second guide so as to be axially coupled by a disk shaft.

[0040] According to another embodiment of the present invention, the height of the first guide and the second guide may be formed to be higher than the height of the disc arm.

[0041] According to another embodiment of the present invention, the disc shaft is pressed into the shaft hole of the disc arm, and the inner diameter of the disc shaft hole formed in the first guide and the second guide may be formed larger than the outer diameter of the disc shaft.

[0042] According to another embodiment of the present invention, the disc shaft is pressed into the disc shaft holes of the first guide and the second guide, and the inner diameter of the shaft hole formed in the disc arm may be formed larger than the outer diameter of the disc shaft.

[0043] According to another embodiment of the present invention, the disk may include a sheet of elastic material provided on the lower part of the disk plate.

[0044] The above-described means for solving the problem are merely exemplary and should not be interpreted as intended to limit the invention. In addition to the exemplary embodiments described above, additional embodiments may exist in the drawings and the detailed description of the invention. Effects of the invention

[0045] The present invention can achieve the following effects through the combination and usage relationship of the embodiments described above and the configuration described below.

[0046] The present invention comprises a body portion having a space formed on the inside and a fluid path formed therein, a hinge shaft supported within the body portion, and a disc portion rotatably supported by the hinge shaft, which opens when fluid flows in the forward direction and closes when fluid flows in the reverse direction, thereby having the effect of preventing backflow by automatically opening and closing the disc according to the flow of fluid.

[0047] The present invention further includes an indicator portion provided on the outer side of the body portion, wherein the indicator portion is configured to allow visual confirmation of the open / closed state of the disc portion from the outside, thereby having the effect of easily confirming whether a leak has occurred in the piping or sprinkler connected to the check valve.

[0048] The present invention comprises, wherein the disc portion includes a disc arm that supports and rotates the disc, and a disc that is rotatably provided on one side of the disc arm to open and close the fluid path, so that the disc can be separated from and replaced with the disc arm in the event of damage to the disc, thereby providing the effect of easy maintenance.

[0049] The present invention has the effect that the disc arm can rotate smoothly around a hinge axis when the disc is opened or closed due to a change in hydraulic pressure within the check valve, by including an arm hub provided to be rotatable on the other side of the disc arm.

[0050] The present invention has the effect of allowing the opening or closing status of the disc inside the check valve to be easily confirmed visually from the outside of the check valve, by including an indicator part comprising a connecting shaft extending in the outer axial direction of the body part and an indicator connected to the outside of the body part and rotatably provided to indicate whether the disc is rotated.

[0051] The present invention has the effect of enabling remote monitoring of whether a leak has occurred in the piping connected to the valve by detecting the open / closed state of the disc as an electrical signal, by further including a limit switch on the plate, which is operated by the rotation of the indicator and further includes a plate installed on the outer side of the body part, wherein the indicator part further includes a limit switch that is operated by the rotation of the indicator to generate an electrical signal.

[0052] The present invention further comprises a shaft to which the indicator is attached, wherein the indicator portion is connected to the outside of the body portion and is rotatably formed, and the shaft includes an insertion hole formed by being axially recessed along a central axis, and corresponding chamfered surfaces are formed on the inner surface of the insertion hole and the outer surface of the connecting shaft, respectively, thereby having the effect of allowing the rotational force of the hinge shaft according to the opening and closing of the disk to be transmitted to the shaft through the connecting shaft.

[0053] The present invention has the effect of allowing for the early detection of the possibility of leakage in a pipe by providing a scale on the plate that indicates the rotation angle of the indicator, thereby enabling quantitative verification from the outside not only of whether the disc part is open or closed but also the opening rate.

[0054] The present invention further includes a hinge shaft supported within the body portion, wherein the hinge shaft further includes a connecting hole formed by being axially recessed along the central axis line of the hinge shaft at one end, and the inner surface of the connecting hole is formed in a shape that is complementary to the outer surface of the connecting shaft, and the connecting shaft is inserted and fastened into the connecting hole so that the rotation of the hinge shaft can be accurately transmitted to the connecting shaft, and the hinge shaft and the connecting shaft are separable, thereby providing the effect of facilitating maintenance in the event of damage to the connecting shaft or the shaft connected thereto.

[0055] The present invention comprises a disc plate that closes the fluid path when fluid flows backward, and a first guide and a second guide that are spaced apart and extend a predetermined height from the upper surface of the disc plate and face each other, wherein one side of the disc arm is positioned between the first guide and the second guide and is axially coupled by a disc shaft, so that when the disc closes the fluid path, it moves slightly relative to the disc arm to be accurately seated on the valve seat, and even when fluid flows due to a slight leakage, the disc arm rotates so that the opening or closing status of the disc can be confirmed through an indicator.

[0056] The present invention has the effect that the height of the first guide and the second guide is formed to be higher than the height of the disc arm, thereby securing a space between the disc arm and the disc plate so that the disc can rotate within a predetermined range around the disc axis when the disc is opened or closed.

[0057] The present invention has the effect of allowing a minute gap between the disk and the disk shaft, thereby enabling stable closure of the disk even in situations where assembly errors or foreign substances are present, by inducing the disk shaft to be pressed into the shaft hole of the disk arm and forming the inner diameter of the disk shaft hole formed in the first guide and the second guide to be larger than the outer diameter of the disk shaft.

[0058] The present invention has the effect of allowing a minute clearance between the disc arm and the disc shaft by press-fitting the disc shaft into the disc shaft holes of the first guide and the second guide, and by forming the inner diameter of the shaft hole formed in the disc arm larger than the outer diameter of the disc shaft, thereby inducing stable closure of the disc even in situations where assembly errors or foreign substances are present. The present invention has the effect of improving watertightness by further including an elastic sheet provided on the lower part of the disc plate, wherein the disc comes into close contact with the valve seat when the flow path is closed.

[0059] However, the effects obtainable from the present invention are not limited to those described above, and other effects may exist. Brief explanation of the drawing

[0060] FIG. 1 is a drawing illustrating an alarm valve for a fire fighting system according to the prior art. FIG. 2 is a perspective view of a check valve according to a preferred embodiment of the present invention. FIG. 3 is an internal cross-sectional view of the check valve. FIG. 4 is an exploded perspective view of the disk portion of the present invention. FIG. 5 is a drawing showing the structure of the disc arm and guide of the disc portion. FIG. 6 is a side view of the disk. FIG. 7 is a drawing showing the internal structure of the check valve. FIG. 8 is a drawing showing the structure of the indicator and hinge axis of the present invention. FIG. 9 is a drawing showing an indicator part of a disk in a closed state according to another embodiment of the present invention. FIG. 10 is a drawing showing the indicator part of the disk in an open state. FIG. 11 is a usage state diagram showing the state in which the check valve is closed. FIG. 12 is a usage state diagram showing the state in which the check valve is open. Specific details for implementing the invention

[0061] Embodiments of the present invention are described below with reference to the attached drawings so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals.

[0062] Throughout the specification of the present invention, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0063] Throughout the entire specification of the present invention, when a member is described as being located "on," "on the upper," "on the top," "under," "on the lower," or "on the bottom" of another member, this includes not only cases where the member is in contact with the other member, but also cases where another member exists between the two members.

[0064] Throughout the specification of the present invention, when a component is described as being "connected" to another component, unless specifically stated otherwise, this does not refer only to a direct connection excluding other components, but includes interconnection using fastening means such as bolts, nuts, and screws, and does not exclude the inclusion of other components in between. Furthermore, terms such as "~part" described in the specification refer to a unit that processes at least one function or operation.

[0065] Throughout the specification of the present invention, the terms "one side" or "one end" refer to a reference part or end of a specific member or mutually corresponding different members, and do not imply an absolute direction. Additionally, the terms "other side" or "other end" refer to the other part or end of the specific member or mutually corresponding different members that corresponds to the "one side" or "one end."

[0066] Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the attached drawings.

[0068] delete

[0069] FIG. 2 is a perspective view of a check valve (1) according to a preferred embodiment of the present invention.

[0070] A check valve can be installed in a piping system through which fluid flows, and can be used to prevent backflow within the piping by opening the disc of the check valve when the fluid flows in the forward direction (for example, the direction of flow from the primary pipe connected to the inlet (110) to the secondary pipe connected to the outlet (120), and closing the disc located between the primary pipe and the secondary pipe when the fluid flows in the reverse direction. Additionally, the disc of the check valve can be opened even when the pressure formed by the fluid inside the secondary pipe, which is the downstream end of the check valve, is lower than the pressure formed by the fluid inside the primary pipe, which is the upstream end of the check valve. This mainly applies when piping equipment, such as branch pipes or floor pipes, or sprinklers connected thereto, ruptures or leaks occur in some locations. Therefore, such check valves are installed in large numbers in the building's piping system and are used as fire alarm valves to alert when a sprinkler bursts or a pipe ruptures due to a fire.

[0072] Referring to FIG. 2, the check valve (1) according to the present invention may include a body part (10) which acts as a chamber in which a fluid path is formed on the inside and a disc for opening and closing the fluid path can move, a hinge shaft (20) which is supported on the inside of the body part (10) and acts as a rotation axis like a hinge when the disc is opened and closed, a disc part (30) which is rotatably supported by the hinge shaft (20), and an indicator part (50) which is provided on the outside of the body part (10) and displays the open / closed state of the disc part (30) to the outside.

[0073] In the check valve (1) of the present invention, when the disk (350) of the disk part (30) is opened or closed by the above structure, the movement is transmitted to the indicator part (50) through the hinge shaft (20), so that it can be confirmed externally by visual inspection or by an electrical signal. In addition, by applying a structure that provides clearance to the connection between the disc (350) and the disc arm (310), the disc (350) can automatically adjust its position and accurately adhere to the valve seat (70) to close the flow path even when there is an assembly error between the valve seat (70) and the disc (350) or when foreign matter is present. Furthermore, even when the disc (350) opens or closes slightly, the movement is accurately transmitted through the hinge shaft (20), thereby allowing for early detection of initial leakage with a small amount of leakage or accumulation of sludge within the valve seat (70) or the disc (350) of the check valve, thereby preventing unexpected damage to the piping equipment or sprinkler or failure of the check valve.

[0074] FIG. 3 is a cross-sectional view of the check valve (1) of the present invention. Referring to FIG. 2 and FIG. 3, the body portion (10) can be understood as a housing that forms an inner space in which a disc portion (30), to be described later, is installed and operated, and includes a connecting portion for connecting to a main pipe or a branch pipe, etc. Specifically, the body portion (10) may include an inlet (110) for connecting to a primary side pipe into which fluid flows, and an outlet (120) for connecting to a secondary side pipe into which fluid flows out during forward flow, and may further include a first connecting portion (130) and a second connecting portion (140) for connecting to the other branch pipe or cross pipe, etc., as needed.

[0076] The hinge shaft (20) supports the disc portion (30), which will be described later, from the inside of the body portion (10), and can be understood as a configuration that acts as a rotation axis through which the disc portion (30) can open and close and rotate according to changes in hydraulic pressure within the check valve. Referring to FIG. 3, the hinge shaft (20) may be installed to be supported in a horizontal direction from the inside of the body portion (10).

[0078] The disc portion (30) can be understood as being rotatably supported by the hinge shaft (20) within the body portion (10) and serving as an operating portion that opens the flow path when the fluid flows in the forward direction and closes the flow path when the fluid flows in the reverse direction to prevent backflow. Referring to FIGS. 3 and 7, the disc portion (30) may include a disc arm (310) that rotates around the hinge shaft (20) and a disc (350) coupled to one side of the disc arm (310) to open and close the actual flow path.

[0079] The disc arm (310) can be understood as a configuration that connects the disc (350) to the hinge shaft (20) and acts as a connecting link that converts the movement of the disc (350) opening and closing into rotational movement of the hinge shaft (20). Specifically, the disc arm (310) may include an axial hole (313) formed to axially connect with the disc (350) on one side (free end side) and an arm hub (311) connected to the hinge shaft (20) on the other side (rotation center side).

[0080] In particular, in the arm hub (311) according to one embodiment of the present invention, the through hole connected through the hinge shaft (20) has an inner diameter corresponding to the outer diameter of the hinge shaft (20) so as to minimize play with the hinge shaft (20), thereby preventing the rotational force of the disc arm (310) from being offset by the play between the hinge shaft (20) and the arm hub (311) when there is a fine opening movement of the disc (350), so that the rotational force resulting from the fine opening and closing can be accurately transmitted to the rotation of the hinge shaft (20).

[0082] The disc (350) can be understood as having a configuration that sits on the valve seat (70) of the inlet pipe located on the inlet port (110) within the body part (10) to physically close the flow path when the fluid flows backward, and opens the flow path when the fluid flows forward. Referring to FIG. 4, the disc (350) may include a disc plate (357) forming the main structure, a seat (359) made of an elastic material provided at the bottom of the disc plate (357) to improve watertightness when the flow path is closed, a first guide (351) and a second guide (353) having a disc shaft hole (355) formed to connect the disc plate (357) and the disc arm (310), and a disc shaft (356).

[0083] The above disc plate (357) can be understood as being supported by the above disc arm (310) and configured to open and close according to the flow of fluid within the check valve. The above disc plate (357) may have a seat (359) made of an elastic material, such as rubber, attached to its lower portion to more completely close the valve seat (70).

[0084] The first guide (351) and the second guide (352) are formed to extend vertically from the upper part of the disk plate (357) and can be understood as a configuration for connecting the disk (350) to the disk arm (310). Referring to FIGS. 4 and 5, the first guide (351) and the second guide (352) are spaced apart to face each other, and disk shaft holes (355a, 355b) for the disk shaft (356) to pass through may be formed on the guides.

[0085] At this time, one side of the disk arm (310) is positioned between the first guide (351) and the second guide (352), so that the axis of the axis hole (313) of the disk arm (310) and the axis of the disk axis holes (355a, 355b) of the first guide (351) and the second guide (352) are aligned, and the disk axis (356) passes through it, thereby allowing the disk (350) and the disk arm (310) to be axially coupled so as to be separable.

[0086] The above-mentioned disc shaft (356) can be understood as a configuration that acts as a connecting pin connecting the disc (350) and the disc arm (310) to each other, allowing the two components to move as a single unit while enabling relative movement under specific conditions. The above-mentioned disc shaft (356) can be fastened by sequentially penetrating the disc shaft hole (355a) of the first guide (351), the shaft hole (313) of the disc arm (310), and the disc shaft hole (355) of the second guide (353).

[0087] Meanwhile, in the present invention, when the Euro is closed, in order to allow the disc (350) to be accurately and stably seated on the valve seat (70) in response to assembly errors of the disc part (30) or foreign matter between the valve seat (70) and the disc (350), a fine gap is allowed in the coupling structure of the disc (350) and the disc arm (310), thereby allowing the disc (350) to move within a predetermined range.

[0088] Referring to FIG. 6, in order to form such clearance, the height of the first guide (351) and the second guide (353) of the check valve according to one embodiment of the present invention may be formed higher than the height of the disc arm (310). At this time, the height of the first guide (351) and the second guide (353) refers to the length in which the first guide (351) and the second guide (353) are extended in a vertical direction from the upper surface of the disc plate (357), and the height of the disc arm (310) may refer to the thickness of the disc arm (310) measured in a direction in which the heights of the first guide (351) and the second guide (353) can all be seen.

[0089] In this way, the disc arm (310) located between the first guide (351) and the second guide (353) is formed at a predetermined height from the upper surface of the disc plate (357) by the disc shaft (356), so that if there is an assembly error when closing the flow path, the disc (350) can rotate within a predetermined range relative to the disc arm (310), thereby enabling stable closing. In this case, it is preferable that a predetermined gap is provided between the first guide (351) and the second guide (353) and the disc arm (310) located between them, so that the disc (350) can move within a predetermined range in the axial direction of the disc shaft (356).

[0090] Referring again to FIG. 5, in order to form the clearance, the check valve according to another embodiment of the present invention may be formed such that the disc shaft (356) is pressed into the shaft hole (313) of the disc arm (310), and the inner diameter of the disc shaft hole (355) of the first guide (351) and the second guide (353) has a diameter larger than the outer diameter of the disc shaft (356). That is, the outer diameter of the disc shaft (356) corresponds to the inner diameter of the shaft hole (313) of the disc arm (310) but is smaller than the inner diameter of the disc shaft hole (355), thereby forming a clearance between the disc shaft hole (353) and the disc shaft (356), so that stable closing of the disc (350) can be induced even in a situation where there is an assembly error or foreign matter.

[0091] Alternatively, a check valve according to another embodiment of the present invention may be formed such that the disc shaft (356) is pressed into the disc shaft hole (355) of the first guide (351) and the second guide (353), and the inner diameter of the shaft hole (313) of the disc arm (310) has a diameter larger than the outer diameter of the disc shaft (356).

[0092] That is, the check valve of the present invention, through the structure as described above, forms a gap between the disc (350) and the disc arm (310) rather than the hinge shaft (20), thereby preventing the rotational force of the disc arm (310) from being offset by the gap between the hinge shaft (20) and the arm hub (311) even during fine opening and closing of the disc (350), so that the rotational force resulting from fine opening and closing can be accurately transmitted to the rotation of the hinge shaft (20).

[0094] The indicator part (50) is installed on the outside of the body part (10) and can be understood as being configured to display the open / closed state of the disc part (30) inside the check valve of the present invention so that an external manager can visually check it, or to detect it as an electrical signal. Referring to FIG. 7, the indicator part (50) may include a plate (510) that serves as a base and on which various parts are arranged, a connecting shaft (520) for transmitting the rotation of the hinge shaft (20) to an external indicator, a shaft (530) that rotates in conjunction with the connecting shaft (520), an indicator (540) attached to the shaft (530) to provide visual information, and a limit switch (550) that converts the rotation state of the connecting shaft (520) into an electrical signal.

[0095] The above plate (510) is fixed to the outside of the body part (10) and serves as a base substrate that supports the main components of the indicator part (50). Referring again to FIG. 4, the plate (510) may have a through hole (511) through which a connecting shaft (520) extending from the hinge shaft (20) can pass from the inside to the outside of the body part (10), and a fixing hole (560) for fixing the plate (510) to the body part (10), and the limit switch (550) may be installed.

[0096] Additionally, according to one embodiment of the present invention, the plate (510) may further include a scale (513) that can quantitatively check the opening and closing rate of the disk (350) by visually displaying the rotation angle of the indicator (540).

[0097] The connecting shaft (520) can be understood as a configuration that serves as a power transmission shaft for transmitting the rotational force of the hinge shaft (20) located inside the body part (10) to the shaft (530) outside the body part (10). At this time, the connecting shaft (520) may be formed as an integral extension from the center of the hinge shaft (20), or it may be provided to be detachably connected by being inserted into the hinge shaft (20). For example, referring again to FIG. 4, one end of the connecting shaft (520) may be inserted into a connecting hole (210) formed by being axially recessed along the central axis of the hinge shaft (20), and the other end may be inserted into an insertion hole (531) of the shaft (530).

[0099] The shaft (530) can be understood as having a configuration that receives rotational force from the connecting shaft (520) and directly rotates an indicator (540) attached to the shaft (530) on the outside of the body part (10). The shaft (530) may include an insertion hole (531) formed by being axially recessed along the central axis.

[0100] Referring to FIG. 8, the outer surface of the connecting shaft (520) is formed with a shape that corresponds to the inner surface of the connecting hole (210) and the insertion hole (531), respectively (e.g., a chamfered surface such as a square shape, a D-cut shape, etc.), so that the rotational force of the hinge shaft (20) according to the opening and closing movement of the disk (350) can be accurately transmitted to the indicator (540) without play or slippage.

[0101] The indicator (540) can be understood as a configuration that is coupled to the shaft (530) and rotates together with it, serving as a visual indicator that allows an administrator to immediately recognize the current open / closed status of the disk (350) visually. Referring to FIG. 7, the indicator (540) may be coupled to the shaft (530) by means such as screws, rivets, or adhesive means. To this end, the shaft (530) may be further provided with a chamfered surface and a screw groove to facilitate the coupling of a flat-shaped indicator (540). The description regarding the shape and coupling method of the shaft (530) and the indicator (540) is merely an example, and the shape or coupling method is not limited as long as it is a means provided to identify whether the connecting shaft (520) is rotating from the outside.

[0102] Referring to FIGS. 9 and 10, the indicator (540) may be a polygon including triangles and squares or an arrow shape, and together with the ruler (513) provided on the plate (510), it may quantitatively indicate whether the disk (350) is in a 'closed' state (FIG. 9 and 11), an 'open' state (FIG. 10 and 12), or open at a certain angle, thereby allowing the manager to visually check the open / close rate of the disk (350) from the outside.

[0103] The limit switch (550) can be understood as a configuration that detects whether the disk (350) is open based on the rotation of the indicator (540), converts this into an electrical signal (On / Off), and transmits it to an external receiving panel or alarm device. The limit switch (550) may be installed on a plate (510) and configured so that the switch is activated when the indicator (540) rotates beyond a predetermined angle.

[0104] For example, referring to FIGS. 10 and 12, when the disk (350) is closed and the position of the indicator (540) is in the 'CLOSE' state, the limit switch (550) is in the 'ON' state and can continuously send an electrical signal to the receiving panel. Referring to FIGS. 9 and 11, when the disk (350) is opened and the position of the indicator (540) rotates to the 'Open' state, the limit switch (550) is switched to the 'OFF' state and the electrical signal is cut off, so that the receiving panel can detect a serious leak or rupture in the pipe or sprinkler. The limit switch (550) is not limited to the above examples, and it is also possible to configure it in the opposite way so that the 'CLOSE' state is 'OFF' and the 'Open' state is 'ON'.

[0105] Referring to FIG. 12, the cover (570) is installed on the plate (510) and can be understood as serving as a case that protects the components of the indicator unit (50), such as the shaft (530), indicator (540), and limit switch (550), from the external environment. The cover (570) is provided to be detachably attached to the plate (510) and may be formed of a transparent material to facilitate easy inspection of the indicator (540) inside the cover (570).

[0107] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will understand that other specific forms can be easily modified without altering the technical spirit or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0108] The scope of the present invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present invention. Explanation of the symbols

[0109] 1: Check valve 10: Body part 110: Inlet 120: Outlet 130: First connecting part 140: Second connecting point 20: Hinge axis 210: Connecting hole 30: Disk section 310: Disc arm 311: AmHerb 313: Chukgong 350: Disk 351: The First Guide 353: Second Guide 355: Disk shaft 356: Disk axis 357: Disk Plate 359: Sheet 50: Indicator section 510: Plate 511: Through hole 513: Ruler 520: Connecting axis 530: Shaft 531: Insertion hole 540: Indicator 550: Limit switch 560: Fixing hole 570: Cover 70: Valve seat 100: Alarm valve for fire fighting equipment

Claims

Claim 1 A check valve comprising a body portion having a space formed on the inside and a fluid path formed therein, and a disc portion rotatably supported on the inside of the body portion, which opens when fluid flows in the forward direction and closes when fluid flows in the reverse direction; wherein the disc portion includes a disc arm that supports and rotates the disc, and a disc that is rotatably provided on one side of the disc arm to open and close the fluid path, and wherein the disc arm includes an arm hub provided on the other side of the disc arm to rotate according to the opening and closing of the disc, and wherein the disc includes a disc plate that closes the fluid path when fluid flows in reverse, and a first guide and a second guide that are spaced apart and extend a predetermined height from the upper surface of the disc plate and face each other, wherein one side of the disc arm is disposed between the first guide and the second guide and is axially coupled by a disc shaft, and wherein the disc portion automatically opens and closes according to the flow of the fluid to prevent reverse flow. Claim 2 A check valve according to claim 1, further comprising an indicator portion provided on the outer side of the body portion, wherein the indicator portion is configured to allow visual confirmation of the open / closed state of the disk portion from the outside. Claim 3 delete Claim 4 delete Claim 5 A check valve according to paragraph 2, wherein the indicator portion comprises a connecting shaft extending outwardly in the axial direction of the body portion and an indicator connected to the outside of the body portion and rotatably provided to indicate whether the disk is rotated. Claim 6 A check valve according to claim 5, wherein the indicator portion further includes a plate installed on the outer side of the body portion, and further includes a limit switch on the plate that is actuated by the rotation of the indicator to generate an electrical signal. Claim 7 In claim 5, the indicator portion further comprises a shaft to which the indicator is attached, which is connected to the outside of the body portion and is rotatably provided, and the shaft comprises an insertion hole formed by being axially recessed along a central axis, and corresponding chamfered surfaces are formed on the inner surface of the insertion hole and the outer surface of the connecting shaft, respectively. Claim 8 A check valve according to claim 6, characterized in that a scale indicating the rotation angle of the indicator is provided on the plate, allowing the degree of opening and closing of the disc portion to be checked from the outside. Claim 9 A check valve according to claim 7, further comprising a hinge shaft supported within the body portion, wherein the hinge shaft further comprises a connecting hole formed by an axial recess along the central axis line of the hinge shaft at one end, wherein the inner surface of the connecting hole is formed in a shape complementary to the outer surface of the connecting shaft, and wherein the connecting shaft is inserted and fastened into the connecting hole. Claim 10 delete Claim 11 A check valve according to claim 1, characterized in that the height of the first guide and the second guide is higher than the height of the disc arm. Claim 12 A check valve according to claim 1, wherein the disc shaft is pressed into the shaft hole of the disc arm, and the inner diameter of the disc shaft hole formed in the first guide and the second guide is larger than the outer diameter of the disc shaft. Claim 13 A check valve according to claim 1, wherein the disc shaft is pressed into the disc shaft holes of the first guide and the second guide, and the inner diameter of the shaft hole formed in the disc arm is larger than the outer diameter of the disc shaft. Claim 14 A check valve according to claim 1, wherein the disk further comprises a sheet of elastic material provided on the lower part of the disk plate.

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