KR101715886B1 - Protective structure having super blast valve - Google Patents

Protective structure having super blast valve Download PDF

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Publication number
KR101715886B1
KR101715886B1 KR1020150082534A KR20150082534A KR101715886B1 KR 101715886 B1 KR101715886 B1 KR 101715886B1 KR 1020150082534 A KR1020150082534 A KR 1020150082534A KR 20150082534 A KR20150082534 A KR 20150082534A KR 101715886 B1 KR101715886 B1 KR 101715886B1
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South Korea
Prior art keywords
pressure
explosion
disk
opening
outlet
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KR1020150082534A
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Korean (ko)
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KR20160146024A (en
Inventor
현광환
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(주)인디고존
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Priority to KR1020150082534A priority Critical patent/KR101715886B1/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/04—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate against air-raid or other war-like actions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Environmental & Geological Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Safety Valves (AREA)

Abstract

The present invention relates to a protection structure having an explosion-proof valve, comprising: a body having an inlet port and an outlet port communicating with each other to penetrate through the thickness direction; An explosion-proof valve unit provided on the side of the outlet, for blocking a storm pressure flowing through the inlet; And a pressure-reducing unit provided on the inlet side for attenuating the pressure of the inflow water toward the inlet side.

Description

[0001] PROTECTIVE STRUCTURE HAVING SUPER BLAST VALVE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a protection structure having an explosion-proof valve, and more particularly, to a protection structure having an explosion-proof valve that can effectively block a high explosion pressure.

In recent years, terrorism due to explosives has frequently occurred, and as the industry is advanced, the frequency of use of gas and explosives increases, and protection measures against these facilities are increasing. Especially, in densely populated areas such as Korea, densely populated areas are located adjacent to dangerous facilities, so it is necessary to carefully prepare for the explosion risk.

Moreover, in recent years, explosive power of various kinds of bombs including nuclear bombs has been increasing tactically. Accordingly, the protection capability of the protection facilities should be improved, and if the bomb is hit, it is impossible to guarantee the protection of the persons and facilities in the event of the bomb being attacked.

Furthermore, chemical weapons, biological warfare and radioactive warfare can lead to mass destruction of human life. Microorganisms such as chemical gases, bacteria and viruses such as nerve gas sprayed in areas where these chemical warfare, biological warfare and radioactive warfare occur, And harmful dusts, the majority of human lives are exposed as they are, and they are inevitably sacrificed with defenselessness.

In order to solve the above problems, the explosion-proof valve installed in the ventilation openings of collective protection facilities or industrial protection facilities is disclosed in Patent Publication No. 10-1140732. However, the reflection pressure that can be blocked by this prior art is 13 bar, which makes it impossible to block the explosive force of the bomb according to recent trends.

Korean Patent Registration No. 10-1140732

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a protective structure having an explosion-proof valve capable of effectively blocking reflection pressure of 40 bar or more.

According to an aspect of the present invention, there is provided a liquid container comprising: a body having an inlet port and an outlet port communicating with each other in a thickness direction; A pressure-sensitive attenuator provided on the inlet side for attenuating the pressure of the inflow to the inlet side; And an explosion-proof valve unit provided on the side of the outlet, for blocking an explosive pressure attenuated by the explosion-reducing unit.

Here, it is preferable that at least one of the inlet and the outlet includes a section extending in a radial direction.

Also, the pressure-sensitive attenuator may include: a first blocking portion having a first opening and a second opening for opening the hollow along the thickness direction of the body; And a second blocking portion provided in the hollow portion of the first blocking portion and having a third opening in a direction crossing the thickness direction of the body.

It is also preferable that a plurality of the third openings are arranged so as to be spaced apart from each other.

The width of the first opening and the second opening may be smaller than the width of the inlet of the body or the outlet of the body.

Further, the explosion-proof valve unit may include: a valve body provided at the outlet; A disk fixing housing provided along a center axis of the valve body; A shaft portion inserted into the disc fixing housing; A disk moving housing inserted on the shaft and movable along the shaft; A first elastic member provided to surround the outer surface of the shaft portion inside the disk fixing housing to provide an elastic force to the disk moving housing side; And a disk having a position fixed to the disk moving housing.

In addition, it is preferable that the elastic member mitigates the impact due to the extensional pressure when inflow of pressure from the inlet side.

The shaft portion may include an extension portion extending in a radial direction at an end portion adjacent to the pressure-sensitive attenuation portion, the extension portion being provided between the extension portion and the disk moving housing, And a second elastic member for adjusting the position of the disc moving housing with respect to the first elastic member.

It is also preferable that the disk is provided such that its cross-sectional area increases as it approaches the pressure-sensitive attenuation portion, and the end portion near the pressure-sensitive attenuation portion is provided to be bent toward the center.

According to the present invention, it is possible to secure a proper amount of airflow and to maintain the function of a normal ventilator at a normal time.

In addition, even if an external explosion or an internal explosion occurs, the pressure reduced by the inner and outer pressure plates can close the disk to block storm pressure, fallout, and the inclusion of the bottoms.

1 is a front sectional view schematically showing a protection structure including an explosion-proof valve according to an embodiment of the present invention,
FIG. 2 is an exploded perspective view schematically showing a pressure-proofing damper in a protective structure having an explosion-proof valve according to FIG. 1,
FIG. 3 is a plan view schematically showing a pressure-proofing damper in a protective structure having an explosion-proof valve according to FIG. 1,
FIG. 4 is a front view schematically showing an explosion-proof valve unit in a protective structure having an explosion-proof valve according to FIG. 1,
5 is an exploded view schematically showing the explosion-proof valve unit according to FIG. 4,
FIG. 6 and FIG. 7 are front views schematically showing the operational state of the explosion-proof valve unit according to whether explosive action is applied in the explosion-proof valve unit according to FIG.

Hereinafter, a protective structure including an explosion-proof valve according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

1 is a front sectional view schematically showing a protective structure having an explosion-proof valve according to an embodiment of the present invention.

Referring to FIG. 1, a protective structure 100 having an explosion-proof valve according to an embodiment of the present invention is capable of effectively preventing an explosive force of an explosive bomb with improved performance, and includes a body 110, And an explosion-proof valve unit 150.

The body 110 serves as a main frame of a protective structure 100 having an explosion-proof valve according to an embodiment of the present invention, and has a through-hole 111 penetrating through the thickness direction.

According to an embodiment of the present invention, the body 110 may be a building for protecting a picture, a collective protection facility or a protection facility, and the through-hole 111 may be a vent or an air outlet.

Meanwhile, the body 110 may be formed of concrete to sufficiently support a tensile force, but the present invention is not limited thereto.

The through hole 111 has an inlet 112 outside the body 110 and an outlet 113 inside the body 110. The inlet 112 and the outlet 113 communicate with each other.

According to an embodiment of the present invention, at least one of the inlet 112 and the outlet 113 may be extended in the radial direction of the through-hole 111.

Here, the through-hole 111 can be used as a ventilation hole or the like, and sufficient air can flow into the inside and the outside through the through-hole 111 before the explosion-proof valve part 150 is operated. In this case, the amount of air flowing into and out of the structure can be reduced by the explosion-proof portion 120 or the explosion-proof valve portion 150 provided on the inlet 112 and the outlet 113.

In order to solve this problem, in one embodiment of the present invention, by expanding the width of at least one of the inlet 112 and the outlet 113, the amount of air flowing into and out of the structure can be sufficiently secured.

FIG. 2 is an exploded perspective view schematically showing a pressure-proofing attenuator in a protective structure having an explosion-proof valve according to FIG. 1, and FIG. 3 is a plan view schematically showing a pressure-proofing attenuator in a protective structure having an explosion- .

2 or 3, the pressure-sensitive attenuator 120 is provided on the inlet 112 side and is a member that primarily reduces the pressure of the pressure when the pressure is applied to the inlet 112, (130) and a second blocking portion (140).

The first blocking part 130 serves as a main frame of the pressure-sensitive attenuator 120 and includes a first member 131 extending along the longitudinal direction of the through hole 111, And a second member 132 extending from both ends along the direction intersecting with the longitudinal direction of the through-hole 111.

Here, the second member 132 includes a second-first member 132a provided on the outer side of the first member 131 and a second member 132b provided on the inner side of the first member 131, The second-second member 132b extends along the radial direction of the through-hole 111 to provide a space through which the pressure-sensitive attenuator 120 can be connected on the body 110. [

According to one embodiment of the present invention, the second-second member 132b is connected to the body 110 through the bolt on the radially extending portion, but is not limited thereto.

On the other hand, the second member 132 has the first opening 133 formed on the second-first member 132a and the second opening 134 formed on the second-second member 132b.

The explosion pressure is introduced into the explosion-proof damper 120 through the first opening 133 and the explosion pressure is discharged from the explosion-proof damper 120 through the second opening 134 to the side of the explosion-proof valve part 150 / RTI >

The hollow 135 is enclosed by the first member 131 and the second member 132. The first member 131 and the second member 132 may be formed of the same material.

The first member 131 is formed of a cylindrical member and the second member 131 is provided at a corner of two open sides of the first member 131, Part of which is to be closed.

The second blocking portion 140 is a member provided inside the hollow 135 and guiding the flow direction of the extreme pressure introduced into the pressure-sensitive attenuation portion 120 to be changed. The third blocking member 140 includes a third member 141 and a fourth member 142, .

The third member 141 is a member extending along the thickness direction of the body 110 from the outer surface of the second-second member 132b and the fourth member 142 is provided at one end of the third member 141 And is a member closing one end of the third member 141.

Here, the third member 141 is formed with a third opening 143 so that a pressure of the third member 141 can flow in and out on the outer surface of the third member 141. According to an embodiment of the present invention, 141 are spaced apart from each other.

The cross sectional area of the first opening 133 and the second opening 134 formed from the second-first member 132a and the second-second member 132b is Is smaller than the cross-sectional area of the fourth member (142).

This is to reduce the extensional pressure introduced through the first opening 133 by about 2 times by the second interruption 140 to about 1/4.

The pressure in the first opening 133 is blocked by the fourth member 142 in the thickness direction of the body 110 and is converted into the flow in the radial direction of the through hole 111 do. Thereafter, the pushing force is changed so that the direction of flow is directed toward the thickness direction of the body 110 by the inner wall of the first member 131, and the pressure in the direction of the center of the through- Flow. Finally, the flow direction is switched to be directed toward the thickness direction of the body 110, and is released from the pressure-sensitive attenuator 120 through the second opening 134. [

This principle can be explained by a phenomenon in which, when the flow direction of the explosion pressure is switched, the explosion pressure is substantially reduced to 1/2.

For example, even when the explosion is formed by the improved bombs to have a pressure of 40 bar or more, when the pressure is reduced to about 1/4 during the passage through the pressure-attenuator 120 and the pressure is released from the third opening 143, Decay.

The width d 2 of the through-hole 111 in the protective structure 100 having the explosion-proof valve according to an embodiment of the present invention is set to be greater than the width d 2 of the inlet port 112 and the outlet port 113 (d 3 ).

The width d 1 of the first opening 133 and the second opening 134 can be appropriately set in accordance with the amount of fluid flowing into the inlet 112 side.

FIG. 4 is a front view schematically showing the explosion-proof valve unit in the protective structure having the explosion-proof valve according to FIG. 1, and FIG. 5 is an exploded view schematically illustrating the explosion-proof valve unit according to FIG.

4 or 5, the explosion-proof valve unit 150 is a member provided on the side of the outlet 113 to block the extensional pressure that is attenuated through the pressure-reducing unit 120. In an embodiment of the present invention, A disk fixing housing 152 and a shaft 153, a disk moving housing 154, a first elastic member 155, a disk 156 and a second elastic member 157. The valve body 151, the disk fixing housing 152,

The valve body 151 serves as a main frame of the valve unit 150 and may be provided in the form of a fall pipe which is in close contact with the outlet 113 and decreases in diameter as it gets farther from the outlet 113 .

The disk fixing housing 152 is provided along the center axis of the valve body 151 and has an insertion groove 152a at the center thereof so that one end of a shaft 153 described later can be disposed.

Meanwhile, according to an embodiment of the present invention, the disk fixing housing 152 may be provided so as to be substantially fixed in position with respect to the valve body 151. Here, the fact that the position is substantially fixed means that even when a predetermined vibration occurs, there is no large movement such as disengaging from the valve body 151. [

Accordingly, the disk fixing housing 152 may be connected to the valve body 151 through an elastic member such as a leaf spring, but the present invention is not limited thereto.

The shaft portion 153 is a member that extends along the center axis of the valve body 151 and has one end inserted into the insertion groove 152a and the other end extended to the opposite side of the insertion groove 152a.

According to an embodiment of the present invention, an extension 153a may be formed at the other end of the shaft 153 to extend along the radial direction of the shaft 153 to increase the cross-sectional area. A second elastic member 157 / RTI > can be limited.

The disk moving housing 154 is a member inserted on the shaft 153 and movable along the shaft 153.

The movement of the disk transfer housing 154 is controlled by the elastic forces of the first elastic member 155 and the second elastic member 157 disposed at both ends, and a detailed description thereof will be described later.

The disk 156 is fixedly connected to the disk transfer housing 154. In one embodiment of the present invention, the cross-sectional area of the disk 156 increases toward the pressure-reducing part 120, As shown in Fig.

That is, the surface of the disk 156 facing the pressure-sensitive damping portion 120 is recessed to be sufficiently influenced by the pressure of the pressure provided from the pressure-

Further, both ends of the disk 156 are extended enough to contact with the inner wall surface of the valve body 151, and are provided so as to completely block the valve body 151 when subjected to a pressure force.

The second elastic member 157 is provided between the extension 153a and the disk movement housing 154 and restricts the movement range of the disk movement housing 154 in a direction approaching the pressure-

The pressure inside the protective structure 100 may be greater than the pressure force provided from the pressure-sensitive attenuator 120 when the pressure force provided from the pressure-sensitive attenuator 120 is reduced. In this case, Moves in the direction approaching the pressure-sensitive attenuator 120 by the pressure difference between the inside and the outside of the first elastic member 155 and the protective structure 100.

At this time, when the pressure difference between the inside and the outside of the protective structure 100 is substantial, the disk moving housing 154 moves to the initial state and can not open the through hole 111, It is possible to cause a situation that the through hole 111 is closed again by coming into contact with the wall surface of the outlet 113.

In order to prevent such a situation, in one embodiment of the present invention, the second elastic member 157 is provided to limit the range of motion of the disk transfer housing 154.

Furthermore, the second elastic member 157 can restrict the sudden movement of the disc moving housing 154 by the first elastic member 155. [

The disk 156 is moved in a direction away from the through hole 111 integrally with the disk moving housing 154 and the movement of the disk 156 is transmitted to the first elastic member 155).

At this time, the first elastic member 155 compresses to a degree sufficient to offset the overpressure, and if a later-described pressure drop on the disc 156 is reduced, a considerable restoring force is applied to the disc moving housing 156, ) Can be considerably impacted.

In this way, the impact applied to the disk transfer housing 156 is buffered through the second elastic member 157, so that the explosion-proof valve unit 150 can return to the initial state stably.

The specific configuration of the explosion-proof valve unit 150 as described above is one example in which the present invention can be practiced, but it is not limited thereto, and it is natural that any explosion-proof valve that has been already disclosed can be used here.

Hereinafter, a description will be made with reference to a process in which an explosive pressure is applied to and blocked from the operation of the embodiment of the protective structure having the explosion-proof valve.

When explosion occurs outside the protective structure 100 due to a predetermined explosion, considerable pressure is generated and the pressure can be introduced into the protective structure 100 through the through hole 111 of the protective structure 100.

The overpressure is introduced into the pressure-sensitive attenuator 120 through the first opening 133.

The pressure-sensitive attenuation unit 120 guides the flow direction of the fluid flowing through the arrangement of the first blocking unit 130 and the second blocking unit 142 to be switched at least twice.

More specifically, in one embodiment of the present invention, the pressure force introduced through the first opening 133 is blocked by the fourth member 141 so that the flow direction along the direction parallel to the fourth member 141 And is primarily switched.

The flow pressure is firstly interrupted by the inner wall surface of the first member 131 so that the flow direction is secondarily switched in a direction parallel to the inner wall surface of the first member 131. [

Secondarily, the pressure in which the flow direction is changed is blocked again by the second-second member 132b, and flows through the third opening 143 and the second opening 134 (134) while flowing along the outer surface of the third member 141 And passes through the pressure-dropping damper 120.

During this process, the flow direction of the overpressure is switched twice or more, whereby the overpressure is reduced by about a quarter of that at the time when the overpressure is attained to the pressure- Accordingly, even when the performance of the bomb or the like is improved and the explosive pressure of 40 bar or more is generated outside the protective structure 100, the explosive damper 120 according to the embodiment of the present invention can reduce the explosive pressure to about 10 bar, It is possible to cut off the influence of the battery 100 on the inside of the explosion as much as possible.

FIG. 6 and FIG. 7 are front views schematically showing the operational state of the explosion-proof valve unit according to whether explosive action is applied in the explosion-proof valve unit according to FIG.

Referring to FIG. 6, the reduced pressure through the pressure-sensitive attenuator 120 reaches the outlet 113 via the inlet 112 and presses the disk 156 facing the inlet 112.

The disk 156 is fixedly connected to the disk transfer housing 154 and when the pressure is applied, the disk transfer housing 154 slides along the direction in which the pressure is applied on the shaft 153. The movement of the disk moving housing 154 is restricted by the first elastic member 155 and the disk moving movement of the disk moving housing 154 is stopped at a position where the pressure force applied to the disk 156 and the compressive force of the first elastic member 155 are substantially the same. The movement of the housing 154 stops.

At this time, the disk 156 is brought into contact with the inner wall surface of the valve body 151, and the valve body 151 and the outlet 113 are closed. Therefore, it is possible to prevent intrusion of explosion due to a bomb attack, which may be a cause of the explosion, and subsequent radiation fall-off into the inside of the protective structure 100.

Here, when the pressure force transmitted from the pressure-sensitive damper 120 is suddenly applied to the disc 156, the disc fixing housing 152 and the disc moving housing 154 may collide with each other. However, The length of the elastic member 155, the elastic modulus and the like can be appropriately adjusted. This can be set differently depending on the magnitude of the explosion pressure that the explosion-proof valve can tolerate.

7, the compressive force of the first elastic member 155 may be greater than the pushing force applied to the disc 156 when the pushing force applied to the disc 156 is gradually or suddenly canceled, The disk moving housing 154 moves in the direction away from the disk fixing housing 152 by the pressure difference between the inside and the outside of the disk fixing housing 152, for example, the negative pressure generated after the bomb explosion. As a result, the outlet 113 is opened again, allowing air to flow in and out.

The disk moving housing 154 slides suddenly toward the extended portion 153a of the shaft portion 153, and thus the disk is moved to the extended portion 153a of the shaft portion 153. Therefore, It may collide with the portion 153a and be damaged.

Further, the disk 156 may come into contact with the wall surface of the outlet 113 to cause a situation where the through hole 111 is closed again.

The second elastic member 157 is interposed between the disk moving housing 154 and the extended portion 153a so that the disk moving housing 154 To prevent the disc moving housing 154 from moving sensitively.

It is to be understood that the scope of the present invention is not limited to the above embodiments and that various changes and modifications may be made without departing from the spirit and scope of the present invention, I will see.

100: Protective structure with explosion-proof valve
110: body 111: through hole
120: Stress-reducing unit 130:
140: second blocking part 150: explosion-proof valve part

Claims (9)

A body having an inlet port and an outlet port communicating with each other so as to penetrate through the thickness direction;
A pressure-sensitive attenuator provided on the inlet side for attenuating the pressure of the inflow to the inlet side;
And an explosion-proof valve unit provided on the side of the outlet, for blocking an explosive pressure attenuated by the explosive-
The pressure-
A first blocking portion having a first opening and a second opening for opening the hollow along the thickness direction of the body; And a second blocking portion provided in the hollow of the first blocking portion and having a third opening in a direction crossing the thickness direction of the body,
Wherein the width of the first opening and the second opening is smaller than the width of the inlet of the body or the outlet of the body. The method according to claim 1,
Wherein at least one of the inlet and the outlet includes a section having a width extending in a radial direction. delete The method according to claim 1,
And the third openings are arranged so that a plurality of the third openings are spaced apart from each other. delete The method according to any one of claims 1, 2, and 4,
The explosion-
A valve body provided at the outlet;
A disk fixing housing provided along a center axis of the valve body;
A shaft portion inserted into the disc fixing housing;
A disk moving housing inserted on the shaft and movable along the shaft;
A first elastic member provided to surround the outer surface of the shaft portion inside the disk fixing housing to provide an elastic force to the disk moving housing side;
And a disk fixedly positioned in the disk moving housing. The method according to claim 6,
Wherein the first elastic member is provided with an explosion-proof valve for relieving an impact caused by an explosion when inflow of pressure from the inlet side. The method according to claim 6,
Wherein the shaft portion has an extension portion extending in the radial direction at an end portion close to the pressure-sensitive damping portion,
And a second elastic member provided between the extension part and the disc moving housing to adjust the position of the disc moving housing with respect to the first elastic member by applying an elastic force to the disc moving housing side, Protective structure with valve. The method according to claim 6,
Wherein the disk is provided so as to have an increased cross-sectional area as it approaches the pressure-sensitive attenuation portion, and an end portion near the pressure-sensitive attenuation portion is bent toward the center direction.



KR1020150082534A 2015-06-11 2015-06-11 Protective structure having super blast valve KR101715886B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101860794B1 (en) * 2018-01-31 2018-05-25 탑원이앤씨(주) Water drain control valve

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112963591B (en) * 2021-03-21 2022-02-15 东北石油大学 Double-trigger umbrella type explosion-proof valve for oil-gas pipeline

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002004741A (en) * 2000-06-20 2002-01-09 Sekisui Chem Co Ltd Ventilating opening for building

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101140732B1 (en) * 2009-01-15 2012-05-03 (주)인디고존 Explosion-proof Valve

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002004741A (en) * 2000-06-20 2002-01-09 Sekisui Chem Co Ltd Ventilating opening for building

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101860794B1 (en) * 2018-01-31 2018-05-25 탑원이앤씨(주) Water drain control valve

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