KR101440381B1 - Sealing structure of metal seat of butterfly valve - Google Patents

Sealing structure of metal seat of butterfly valve Download PDF

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Publication number
KR101440381B1
KR101440381B1 KR1020140008985A KR20140008985A KR101440381B1 KR 101440381 B1 KR101440381 B1 KR 101440381B1 KR 1020140008985 A KR1020140008985 A KR 1020140008985A KR 20140008985 A KR20140008985 A KR 20140008985A KR 101440381 B1 KR101440381 B1 KR 101440381B1
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KR
South Korea
Prior art keywords
valve body
metal sheet
disk
sheet
bolt
Prior art date
Application number
KR1020140008985A
Other languages
Korean (ko)
Inventor
최호정
박근영
김준모
Original Assignee
주식회사현대밸브
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Publication date
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Priority to KR1020140008985A priority Critical patent/KR101440381B1/en
Application granted granted Critical
Publication of KR101440381B1 publication Critical patent/KR101440381B1/en

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    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F16K1/226—Shaping or arrangements of the sealing
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/42—Valve seats
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0209—Check valves or pivoted valves
    • F16K27/0218—Butterfly valves

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lift Valve (AREA)

Abstract

The present invention relates to a butterfly valve which includes a valve body made of a cast iron or a cast iron alloy material and having a flow passage; a shaft made of a stainless steel material, connected to the valve body, and rotating by operation of an opening/closing mechanism; a disk fixed to the shaft to be rotatably mounted to the valve body and opening/closing the flow passage of the valve body by rotation of the shaft; a metal sheet installed at the flow passage of the valve body to primarily come in contact with an outer circumference of the disk for forward water sealing; a solid sheet overlapped with and installed on the metal sheet to secondarily come in contact with the outer circumference of the disk for reverse water sealing; and a pressing plate overlapped with and installed on the solid sheet to press and fix the solid sheet and the metal sheet to the valve body so as to prevent the solid sheet and the metal sheet from being separated and deformed. By providing a two-way metal sheet sealing structure of a butterfly valve in which two-step, two-way sealing is possible, the sealing between the valve disk and the metal sheet is maintained in a stable state by elastic deformation of the metal sheet even when the butterfly valve is used for a long period, and thus reliability of the product is improved.

Description

A sealing structure of a metal seat of a butterfly valve,

The present invention relates to a bi-directional metal sheet sealing structure of a butterfly valve, and more particularly, to a metal sheet sealing structure for a bi-directional metal sheet sealing structure of a butterfly valve, Way bidirectional sealing capable of two-step bi-directional sealing, wherein the two-way bi-directional sealing is composed of a solid sheet which is installed in a superposed manner and contacts the outer circumference of the disk in two steps to make reverse watertightness.

Generally, a butterfly valve is installed inside a valve body connected to a conduit for transferring fluids such as various kinds of industrial water and oil, and a valve disk is rotatably installed by a rotary shaft, And the fluid flow is controlled by opening and closing the pipeline.

At this time, the inner circumferential surface of the valve body and the outer circumferential surface of the valve disc are fitted together with a seat portion formed of a rubber sheet material or a metal sheet material so as to be hermetically sealed.

Such a butterfly valve is a valve that opens and closes a conduit by the rotation of a shutoff plate. Normally, the butterfly valve is installed in a fluid pipe or a gas pipe having a large size and a high pressure.

FIG. 1 is a cross-sectional view showing a conventional butterfly valve, and FIG. 2 is a perspective exploded perspective view showing a portion of a conventional butterfly valve that maintains airtightness.

As shown in the drawing, the conventional butterfly valve includes a valve body 10 having a flow path formed therein, and an eccentric valve stem 21 having an insertion hole formed by opening or closing the flow path of the valve body 10, A valve disc 20 in which a seat space 22 is formed along the edge and one side release preventing hole 23 is formed at a side end portion of the seating space 22 in which the seat space 22 is formed; The seat 30 of the annular body placed in the hole 23 and the seat space 22 of the valve disc 20 are securely seated through the bolts 41 to prevent the valve disc 20 23 of the valve disc 20 so as to fix the seat 30 to the side surface of the valve disc 20 and the seat back 40 of the valve disc 20, A valve shaft 50 axially coupled to the insertion hole of the eccentric valve stem 21 provided on the side surface, And a driving unit (not shown) that engages with the valve shaft 50 to provide a rotational force such that the valve disc 20 is opened and closed.

The conventional butterfly valve having such a configuration is configured such that when the valve disc 20 closes the flow path of the valve body 10 by operating the drive portion, the sheet 30 fixed along the side surface of the valve disc 20 is returned to the valve body 10 ) So as not to leak the fluid.

At this time, the above-mentioned sheet 30 is made of a rubber material (or a relatively hard material made of Teflon) so as to have durability and corrosion resistance against high-temperature or high-pressure fluids, chemicals, and the like.

The sheet 30 according to the prior art is compressed on the seat surface of the valve disk 20 described above to block the fluid by the repulsive force of the seat 30. [ As a result, a stress is generated in the sheet 30 and plastic deformation occurs due to a fluid pressure at a high temperature or a high pressure for a long period of use. As a result, the hardness of the sheet 30 is low.

Further, when the sheet 30 is used to control the fluid to be conveyed bidirectionally, the elasticity of the sheet 30 is lowered, and the sheet 30 is less adaptive to the fluid flow, The management cost is increased.

Korean Registration No. 20-0360344

An object of the present invention is to provide a metal sheet which is provided on a flow path of a valve body so as to make one-step contact with the outer peripheral edge of the disk to make watertightness in a forward direction and a metal sheet which is superimposed on the metal sheet, Way metal sheet sealing structure of a butterfly valve capable of two-step bidirectional sealing made of a solid sheet which is made of a metal sheet.

Another object of the present invention is to provide a bi-directional metal sheet sealing structure of a butterfly valve capable of maintaining the airtightness between the valve disc and the metal sheet in a stable state by elastic deformation of the metal sheet even when used for a long period of time.

Another object of the present invention is to provide a butterfly valve for increasing the durability of a metal sheet by arranging a watertight structure of a metal sheet using elastic deformation by fluid pressure and a watertight structure of a solid sheet which is not deformed by fluid pressure, Thereby providing a bi-directional metal sheet sealing structure.

According to an aspect of the present invention, there is provided a valve body comprising: a cast iron or cast iron alloy valve body; A shaft connected to the valve body and made of stainless steel and rotated by the operation of the opening / closing mechanism; And a disk fixed to the shaft and rotatably mounted on the valve body and opening and closing a flow path of the valve body by rotation of the shaft, wherein the butterfly valve is provided on the flow path of the valve body, A metal sheet which is brought into contact with the outer periphery of the metal sheet in one step so as to be subjected to forward watertight sealing; A solid sheet provided on the metal sheet so as to be in contact with the outer circumferential edge of the disk in two steps so as to be watertight in the reverse direction; And a pressing plate which is installed on the solid sheet and presses the solid sheet and the metal sheet so as to prevent separation and deformation of the solid sheet and the metal sheet by pressing and fixing the solid sheet and the metal sheet to the valve body side. A metal sheet sealing structure may be provided.

Further, a seat engagement end is formed at the periphery of the passage of the valve body.

Further, a sheet ground surface having a gentle inclined surface is formed on the outer circumferential edge of the disk.

The metal sheet may have a bolt first engaging portion for engaging with the valve body using a fastening bolt and a tension member bent in a " C " shape extending from the tip end of the bolt first engaging portion, The first ground plane having a gentle inclined plane is formed on the first ground plane.

The solid sheet may have a bolt second engaging portion that engages with the valve body using a fastening bolt, a deformation preventing portion that is elongated at the distal end of the bolt second engaging portion, and a smooth inclined surface And the second ground plane is formed.

The inner diameter of the second ground plane of the disk is smaller than the inner diameter of the first ground plane of the disk of the metal sheet.

The pressure plate may have a bolt third coupling portion for coupling to the valve body side using a fastening bolt, a plurality of offset holes disposed concentrically on the tip of the bolt third coupling portion, And a part of the pressure fluid introduced through the canceling hole is injected in the vertical direction through the injection path to cancel a fluid pressure flowing into the disk second grounding surface side.

The present invention relates to a metal sheet which is installed on a flow path of a valve body so as to be in one-step contact with an outer circumference of a disk to form watertightness in a forward direction and a metal sheet which is superimposed on the metal sheet, It is possible to maintain the airtightness between the valve disc and the metal sheet in a stable state due to the elastic deformation of the metal sheet even when it is used for a long period of time by providing a bi-directional metal sheet sealing structure of a butterfly valve capable of two- Thereby, the reliability of the product can be improved.

The present invention has the effect of improving the durability of the metal sheet by arranging the watertight structure of the metal sheet using the elastic deformation by the fluid pressure and the watertight structure of the solid sheet not deformed by the fluid pressure in two stages.

1 is a sectional view showing a conventional butterfly valve.
FIG. 2 is a perspective exploded perspective view showing a portion of a conventional butterfly valve that maintains airtightness. FIG.
3 is an overall sectional view showing a bidirectional metal sheet sealing structure of a butterfly valve according to the present invention.
4 is an enlarged view of part A in Fig. 3;
5 is an enlarged view of a portion B in Fig.
Fig. 6 is an enlarged view showing an inverted watertight structure as an enlarged view of part A of Fig. 3; Fig.
7 is an enlarged view of part D in Fig.

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

3 is an overall cross-sectional view showing a bi-directional metal sheet sealing structure of a butterfly valve according to the present invention.

3, the butterfly valve of the present invention includes a valve body 110 made of a cast iron or cast iron alloy having a flow path, a valve body 110 connected to the valve body 110, A shaft 120 fixed to the shaft 120 and rotatably mounted on the valve body 110 so as to open and close a flow path of the valve body 110 by rotation of the shaft 120, (130).

The valve body 110 is opened at both sides to form a flow path, thereby providing a structure in which the fluid can flow.

The disk 130 opens or closes the flow path of the valve body 110 so that the outer periphery of the disk body contacts the metal sheet 140 and the solid sheet 150 provided on the valve body 110 side, Way watertightness.

Fig. 4 is an enlarged view of part A in Fig. 3, Fig. 5 is an enlarged view of part B in Fig. 4, Fig. 6 is an enlarged view showing an inverted watertight structure as an enlarged view of part A in Fig. 3, Fig.

4 and 5, the sealing structure of the present invention includes a metal sheet 140 installed on the flow path of the valve body 110 to make one-step contact with the outer circumferential surface of the disk 130, A solid sheet 150 which is installed on the metal sheet 140 so as to be in contact with the outer circumferential surface of the disk 130 in two steps so as to be watertight in the reverse direction and a solid sheet 150 superposed on the solid sheet 150, And a pressing plate 160 that presses the metal sheet 140 and the metal sheet 140 against the valve body 110 to prevent separation and deformation of the solid sheet 150 and the metal sheet 140.

At this time, a seat engagement end 111 is formed at the periphery of the flow path of the valve body 110, and a metal sheet 140, a solid sheet 150, and a pressure plate 160 are sequentially attached to the seat engagement end 111 After stacking, they are combined using fastening bolts 170.

At this time, a sheet ground plane 131 having a smooth slope is formed on the outer circumferential edge of the disk 130.

At this time, the seat ground surface 131 may be made of a different material from the body of the disk 130. For example, the body may be made of a metal having excellent durability, and the seat ground surface 131 may be physically combined with a synthetic resin material having excellent contact force.

The metal sheet 140 is formed with a bolt first coupling portion 141 to be coupled to the valve body 110 by using a coupling bolt 170 and has a first And a disk first ground plane 145 having a gentle slope at the end of the tension portion 143 is formed.

At this time, the tension portion 143 may be made thinner than the bolt first coupling portion 141, thereby providing a structure capable of bending deformation and restoration by fluid pressure.

The solid sheet 150 is formed with a bolt second engaging part 151 which engages with the valve body 110 by using a fastening bolt 170 and has a long length at the tip of the bolt second engaging part 151 And the disk second ground plane 155 having a gentle slope at the end of the deformation preventing portion 143 can be formed.

At this time, the inner diameter of the end of the disk second ground plane 155 may be smaller than the inner diameter of the end of the disk first ground plane 145 of the metal sheet 140.

The pressing plate 160 is formed with a bolt third engaging part 161 which is fastened to the valve body 110 using a fastening bolt 170. The bolt third engaging part 161 has a concentric A plurality of offset holes 163 are formed in the offset hole 163 so as to form an injection path connected to the clearance between the offset hole 163 and the solid sheet 150, The fluid can be injected in the vertical direction through the injection path to cancel the fluid pressure entering the disk second ground plane 155 side.

Referring to FIG. 5, the solid sheet 150 is coupled to the left side of the metal sheet 140, and the left-to-right direction is referred to as a forward flow of the fluid, and the reverse flow is defined as a reverse flow.

At this time, the pressure of the fluid flow causes the disk 130 to be bent in the forward direction. At this time, a gap is generated between the disk second ground plane 155 of the solid sheet 150 and the seat ground plane 131 of the disk 130, and the pressure fluid flows through the gap.

At this time, the inflow pressure fluid presses the inside of the tension portion 143 of the metal sheet 140 to deform it in the forward direction. At this time, as the tension portion 143 is deformed forwardly, the disk first ground surface 145 pushes the seat ground surface 131 of the disk 130 to achieve water tightness.

At this time, some pressure fluid introduced through the offset hole 163 of the pressure plate 160 is injected in the vertical direction through the injection path to cancel the fluid pressure flowing into the disk second ground plane 155 side.

Fig. 6 is an enlarged view showing an inverted watertight structure as an enlarged view of a portion A of Fig. 3, and Fig. 7 is an enlarged view of a portion D of Fig.

Referring to FIGS. 6 and 7, when the solid sheet 150 is coupled to the left side of the metal sheet 140, the left-to-right direction is referred to as a forward flow of the fluid, and the reverse flow is defined as a reverse flow , Figures 6 and 7 show the reverse flow.

As shown in the drawing, the disk 130 is bent in a reverse direction by the pressure according to the fluid flow. At this time, the sheet grounding surface 131 of the disk 130 is strongly adhered to the disk second grounding surface 155 of the solid sheet 150 to be watertight.

At this time, the outside of the tension portion 143 of the metal sheet 140 is deformed in the reverse direction by the fluid pressure. At this time, as the tension portion 143 is deflected in the reverse direction, the disk first ground surface 145 abuts against the inner surface of the solid sheet 150 to prevent further deformation.

This has the advantage of minimizing the fatigue load and extending the life span by preventing the metal sheet 140 from being elastically deformed more than necessary.

As described above, according to the present invention, a metal sheet is installed on a flow path of a valve body so as to make one-step contact with an outer circumference of a disk to form a watertight seal in a forward direction, It is possible to provide a two-way bi-directional sealable butterfly valve bi-directional metal sheet sealing structure, which is made of a solid sheet for watertight sealing, so that even when used for a long time, the airtightness between the valve disc and the metal sheet can be stabilized State, so that the reliability of the product can be enhanced.

In addition, the present invention can improve the durability of the metal sheet by arranging the watertight structure of the metal sheet using elastic deformation by the fluid pressure and the watertight structure of the solid sheet not deformed by the fluid pressure in two stages.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You can understand that you can.

For example, a person skilled in the art can change the material, size and the like of each constituent element depending on the application field or can combine or substitute the embodiments in a form not clearly disclosed in the embodiments of the present invention, Of the range.

Therefore, it should be understood that the above-described embodiments are only illustrative in all aspects and should not be construed as limiting the scope of the invention, and such modified embodiments are included in the technical idea described in the claims of the present invention.

110: valve body 111: seat coupling end
120: shaft 130: disk
131: sheet ground plane 140: metal sheet
141: bolt first coupling part 143: tension part
145: disk first ground plane 150: solid sheet
151: bolt second coupling portion 153: deformation preventing portion
155: disk second ground plane 160: pressure plate
161: bolt third coupling part 163: offset ball
170: fastening bolt

Claims (7)

A valve body 110 made of cast iron or cast iron alloy having a flow path; A shaft 120 connected to the valve body 110 and made of stainless steel and rotated by the operation of the opening / closing mechanism; And a disk 130 fixed to the shaft 120 and rotatably mounted on the valve body 110 and opening and closing the flow path of the valve body 110 by rotation of the shaft 120 As a butterfly valve,
A metal sheet 140 installed on the flow path of the valve body 110 to make one-step contact with the outer circumference of the disk 130 so as to be watertight in the forward direction;
A second bolt coupling (not shown) that is coupled to the valve body 110 by using a fastening bolt 170 is provided to be overlapped on the metal sheet 140 to make two-step contact with the outer circumference of the disk 130, Wherein the deformation preventing portion 153 is formed at the tip end of the bolt second coupling portion 151 and the deformation preventing portion 153 is formed at the end of the deformation preventing portion 153, A solid sheet 150 forming a ground plane 155; And
The solid sheet 150 and the metal sheet 140 are superposed on the solid sheet 150 so that the solid sheet 150 and the metal sheet 140 are prevented from being separated and deformed by pressing the solid sheet 150 and the metal sheet 140 against the valve body 110 And a bolt third coupling portion 161 is formed to be coupled to the valve body 110 side by using the coupling bolt 170. A plurality of bolt third coupling portions 161 are provided concentrically on the tip of the bolt third coupling portion 161 And a part of the pressurized fluid introduced through the canceling hole 163 passes through the injection passage 163 and the injection passage 163 to form an injection passage connected to the clearance between the canceling hole 163 and the solid sheet 150, And a pressurizing plate (160) which is vertically injected to cancel the fluid pressure flowing into the disk second grounding surface (155) side.
The method according to claim 1,
Wherein a seat engagement end (111) is formed on the periphery of the flow path of the valve body (110).
The method according to claim 1,
Wherein a sheet ground plane (131) having a gentle slope is formed on an outer circumferential edge of the disk (130).
The method according to claim 1,
The metal sheet 140 is formed with a bolt first coupling portion 141 to be coupled to the valve body 110 by using a coupling bolt 170 and has a first Wherein the disk first ground surface (145) is formed to have a gentle inclined surface on the end portion of the tension portion (143), and the first ground surface (145) of the butterfly valve Sealing structure.
delete 5. The method of claim 4,
Wherein the inner diameter of the end of the disk second ground plane (155) is smaller than the inner diameter of the end of the disk first ground plane (145) of the metal sheet (140). delete
KR1020140008985A 2014-01-24 2014-01-24 Sealing structure of metal seat of butterfly valve KR101440381B1 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107355547A (en) * 2017-08-08 2017-11-17 英诺威阀业有限公司 It is a kind of from pressurising bidirectional sealed butterfly valve
US10150974B2 (en) 2013-06-28 2018-12-11 Green Biologics Limited Solvent production
RU208774U1 (en) * 2021-10-05 2022-01-13 Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный технологический университет" Butterfly valve
KR102448043B1 (en) * 2022-02-21 2022-09-27 홍정민 Fire safe butterfly valve
CN115654194A (en) * 2022-10-08 2023-01-31 江苏高达阀门有限公司 Bidirectional sealing butterfly valve and use method thereof
KR20240057185A (en) 2022-10-24 2024-05-02 주식회사 동양밸브 Bidirectional Butterfly Valve

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200170381Y1 (en) * 1999-07-20 2000-02-15 박일열 Body flexible metal seat butterfly valve
KR100927361B1 (en) * 2009-06-11 2009-11-19 주식회사현대밸브 A butterfly valve improved airtight function
KR20110016388A (en) * 2009-08-11 2011-02-17 (주) 삼진정밀 Very low temperature for butterfly valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200170381Y1 (en) * 1999-07-20 2000-02-15 박일열 Body flexible metal seat butterfly valve
KR100927361B1 (en) * 2009-06-11 2009-11-19 주식회사현대밸브 A butterfly valve improved airtight function
KR20110016388A (en) * 2009-08-11 2011-02-17 (주) 삼진정밀 Very low temperature for butterfly valve

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10150974B2 (en) 2013-06-28 2018-12-11 Green Biologics Limited Solvent production
CN107355547A (en) * 2017-08-08 2017-11-17 英诺威阀业有限公司 It is a kind of from pressurising bidirectional sealed butterfly valve
RU208774U1 (en) * 2021-10-05 2022-01-13 Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный технологический университет" Butterfly valve
KR102448043B1 (en) * 2022-02-21 2022-09-27 홍정민 Fire safe butterfly valve
CN115654194A (en) * 2022-10-08 2023-01-31 江苏高达阀门有限公司 Bidirectional sealing butterfly valve and use method thereof
KR20240057185A (en) 2022-10-24 2024-05-02 주식회사 동양밸브 Bidirectional Butterfly Valve

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