KR101037920B1 - Cavitation check for butterfly valve - Google Patents

Cavitation check for butterfly valve Download PDF

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Publication number
KR101037920B1
KR101037920B1 KR1020100108725A KR20100108725A KR101037920B1 KR 101037920 B1 KR101037920 B1 KR 101037920B1 KR 1020100108725 A KR1020100108725 A KR 1020100108725A KR 20100108725 A KR20100108725 A KR 20100108725A KR 101037920 B1 KR101037920 B1 KR 101037920B1
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KR
South Korea
Prior art keywords
pipe
butterfly valve
expansion
plate
cavitation
Prior art date
Application number
KR1020100108725A
Other languages
Korean (ko)
Inventor
정태희
Original Assignee
(주) 삼진정밀
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Publication date
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Priority to KR1020100108725A priority Critical patent/KR101037920B1/en
Application granted granted Critical
Publication of KR101037920B1 publication Critical patent/KR101037920B1/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
    • F16K1/221—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 specially adapted operating means therefor
    • 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
    • F16K1/222—Shaping of the valve member
    • 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
    • F16K1/52—Means for additional adjustment of the rate of flow
    • 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
    • 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
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise

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

Abstract

PURPOSE: A cavitation prevention butterfly valve is provided to prevent cavitation with a simple structure by employing perforated plates with a large area. CONSTITUTION: A cavitation prevention butterfly valve comprises a joint pipe(30), a flexible pipe(40), perforated plates(50), a rubber sealing(60), and a support(70). The joint pipe is selectively attached to the outlet side of a body(10) and has a cylindrical shape with plates(31) on both ends thereof. One end of the flexible pipe is inserted in the joint pipe and the other end is formed with a flange(41) connected to a pipe to absorb vibration and expansion/reduction of the pipe. The perforated plates are installed at certain intervals in the vertical direction on the interior of the flexible pipe and have a central lozenge-shaped through hole(51) for preventing cavitation when opening a disc(20), wherein the lozenge-shaped through holes are located to cross each other at the right angle. The rubber sealing is installed on the exterior of the flexible pipe to seal the gap between the joint pipe and the flexible pipe. The support is provided on the exterior of the flexible pipe to support the rear side of the rubber sealing not to separate. The support includes a plate(71) to be connected to the plate of the joint pipe with a fastening member.

Description

Cavitation Check Butterfly Valve

The present invention relates to a butterfly valve for preventing cavitation, and more particularly, by installing the rhombic through-holes intersected at the center of a plurality of perforated plates so as to prevent cavitation by controlling the fluid flowing in rapidly during the rapid opening of the disc. It is installed inside the expansion joint pipe and is easy to manufacture and install by simple fastening structure.When the disc is completely opened, it is not disturbed by the flow of fluid by the transfer hole of the perforated plate, and only when the disc goes up to a small opening degree. The present invention relates to a butterfly valve for preventing cavitation, in which a large perforated plate having a large upper and lower area is used to control the flow of a fluid, thereby preventing cavitation reliably compared to a simple structure.

The fluid flowing at high pressure inevitably flows at different opening areas in the valve which regulates the flow to the disk, especially in the small opening area when the disc starts to open with the disc closed due to a sudden increase in flow rate. The water pressure is lower than the saturated steam pressure, and at this time, the fluid evaporates and becomes a gas, thereby generating a cavitation phenomenon in which bubbles are generated, which not only causes noise and vibration, but also erodes the disk and the body. A problem occurs.

In order to prevent such cavitation from occurring, a pressure drop may occur in the valve opening of the valve to prevent the fluid flow rate from increasing, thereby preventing the pressure from dropping below the vapor pressure.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems,

Rhombic through-holes are alternately installed at the center of a number of perforated plates to prevent cavitation by controlling the fluid flowing in rapidly when the disc is suddenly opened.It is installed inside the expansion joint and manufactured and installed by a simple fastening structure. It is an object of the present invention to provide a butterfly valve for preventing cavitation, which is easy and does not interfere with the flow of fluid by the transfer hole of the porous plate when the disc is completely opened.

In addition, there is a further object to provide a butterfly valve for preventing cavitation to prevent cavitation compared to a simple structure by using a large perforated plate having a large area of the upper and lower parts to control the flow of fluid only when the disc is raised to a small opening. .

In order to achieve the above object, the present invention is a butterfly valve which is installed between the tube and the tube to regulate the flow of the fluid flowing through the body by the rotation of the disk,

A fitting pipe detachable to the outlet side of the body and having a plate formed at both ends in a cylindrical shape;

One side is inserted into the inside of the joint pipe, the other side is a flange is formed so as to connect with the tube to absorb and offset the vibration and expansion of the tube;

A plurality of fixed pipes are fixedly spaced apart from each other at an inner circumference of the flexible tube, and when the disc is opened, a rhombus-shaped through hole is formed at each center to prevent cavitation by controlling a fluid flowing rapidly. Perforated plate and the holes are staggered at right angles to each other;

A rubber sealing provided at an outer circumference of the expansion pipe to seal the fluid and foreign substances from entering / exhaust through the joint pipe and the expansion pipe;

It is provided on the outer periphery of the expansion pipe while supporting the rear side of the rubber sealing to prevent the rubber sealing is separated, the support portion is formed on the outer periphery plate to be connected by the plate and the fixing member of the pipe; It relates to a butterfly valve for preventing cavitation, characterized in that configured.

As described above, the butterfly valve for preventing cavitation of the present invention is installed so that the rhombic through-holes are intersected at the center of the plurality of porous plates, thereby preventing the cavitation by controlling the fluid flowing rapidly during the rapid opening of the disc. It is installed inside the expansion pipe and is easy to manufacture and install by simple fastening structure, and when the disk is completely opened, there is an effect of not disturbing the flow of fluid by the transfer hole of the perforated plate.

In addition, a large perforated plate having a large upper and lower area is used to control the flow of the fluid only when the disc goes up to a small opening degree, thereby reliably preventing cavitation compared to a simple structure.

1 is a cross-sectional view showing a fully open butterfly valve according to an embodiment of the present invention,
Figure 2 is a cross-sectional view showing the operation of the butterfly valve according to an embodiment of the present invention,
3 is a front view showing a porous plate according to an embodiment of the present invention.

The present invention has the following features to achieve the above object.

The present invention is a butterfly valve which is installed between the pipe and the pipe to regulate the flow of the fluid flowing through the body by the rotation of the disk,

A fitting pipe detachable to the outlet side of the body and having a plate formed at both ends in a cylindrical shape;

One side is inserted into the inside of the joint pipe, the other side is a flange is formed so as to connect with the tube to absorb and offset the vibration and expansion of the tube;

A plurality of fixed pipes are fixedly spaced apart from each other at an inner circumference of the flexible tube, and when the disc is opened, a rhombus-shaped through hole is formed at each center to prevent cavitation by controlling a fluid flowing rapidly. Perforated plate and the holes are staggered at right angles to each other;

A rubber sealing provided at an outer circumference of the expansion pipe to seal the fluid and foreign substances from entering / exhaust through the joint pipe and the expansion pipe;

It is provided on the outer periphery of the expansion pipe while supporting the rear side of the rubber sealing to prevent the rubber sealing is separated, the support portion is formed on the outer periphery plate to be connected by the plate and the fixing member of the pipe; It is characterized in that the configuration.

The present invention having such characteristics can be more clearly described by the preferred embodiments thereof.

Before describing the various embodiments of the present invention in detail with reference to the accompanying drawings, it can be seen that the application is not limited to the details of the configuration and arrangement of the components described in the following detailed description or shown in the drawings. will be. The invention may be embodied and carried out in other embodiments and carried out in various ways. It should also be noted that the device or element orientation (e.g., "front," "back," "up," "down," "top," "bottom, Expressions and predicates used herein for terms such as "left," " right, "" lateral, " and the like are used merely to simplify the description of the present invention, Or that the element has to have a particular orientation. Also, terms such as " first "and" second "are used herein for the purpose of the description and the appended claims, and are not intended to indicate or imply their relative importance or purpose.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a cross-sectional view showing a fully open butterfly valve according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing the operation of a butterfly valve according to an embodiment of the present invention, Figure 3 is one of the present invention It is a front view which shows the porous board which concerns on an Example.

As shown in Figures 1 to 3, the cavitation prevention butterfly valve 100 of the present invention, the body 10 is connected between the tube and the tube, the shaft 21 passes through the side of the body 10 Is formed, the disk 20 is connected to the end of the shaft 21 to open and close the interior of the body 10 by rotation, the disk 20 when opening and closing the interior of the body 10, the disk 20 Seat is installed on the inner circumference of the body 10 to seal between the outer circumference of the outer periphery of the body 10 and the butterfly valve 100 is formed. At this time, the cavitation prevention device (not shown) of the present invention can be applied to all the butterfly valve (100).

Here, the cavitation prevention device (not shown) is composed of a joint pipe 30, the expansion pipe 40, the porous plate 50, the rubber seal 60, and the support portion 70.

1 and 2, the fitting pipe 30 is formed in a cylindrical shape and is hollow so that the inside penetrates to both sides, one side of the fitting pipe 30 is formed on the outlet side of the body 10 The plate 31 is formed at 11 to be fixed by fixing means such as bolts and nuts, and the plate 31 is formed at the opposite side to be fixed by the supporting part 70 and the fixing means.

Here, the fitting pipe 30 serves to help the expansion pipe 40 is connected to the body 10 of the butterfly valve 100, when the disk 20 of the butterfly valve 100 opens and closes, Protrudes to the outside of the body 10, while protecting the disk 20 protruding to the outside of the body 10 in accordance with the length of the fitting pipe 30 serves to make a space not to contact the expansion pipe 40 As a result, it is possible to change the design in a variety of forms according to the shape and structure and installation position of the butterfly valve 100.

In addition, the inner circumference of the joint pipe 30, the expansion pipe 40 inserted into one side is driven up, down, left, right by vibration, etc. At this time, the inner circumference of the joint pipe 30 and the expansion pipe ( Space groove 32 is further formed so that the outer periphery of 40 does not contact each other.

In addition, the end portion of the joint pipe 30 in contact with the rubber seal 60 (portion into which the expansion pipe 40 is inserted) is in close contact with the rubber seal 60 to allow the joint pipe 30 and the expansion pipe ( 40) and inclined inward of the fitting pipe 30 to prevent the gap between the fitting pipe 30 and the rubber sealing 60, the rubber sealing 60 is also formed to be inclined in contact with the fitting pipe 30. do.

1 and 2, the expansion pipe 40 is formed in a cylindrical shape, one side is inserted into the interior of the joint pipe 30 by a predetermined interval, the other side is formed with a flange 41 to be connected to the pipe Connect the tube and the body (10) of the butterfly valve (100).

Here, the expansion pipe 40 is the upper and lower, left, right and front, so that the vibration generated in the tube and the expansion and contraction according to the internal and external temperature is not transmitted to the body 10 of the butterfly valve 100. While driving backwards, it absorbs vibration and expansion and contraction and details.

As shown in FIGS. 1 to 3, the porous plate 50 is formed in a disc shape and installed at the inner circumference of the expansion and contraction tube 40. When the disc 20 is opened, the porous plate 50 rapidly flows up and down. A rhombus through-hole 51 is formed in the center to control the flow rate of the fluid.

Here, the shape of the through hole 51 is a rhombus shape, the long axis is formed to the edge of the porous plate 50 in the form of a rhombus, the area of the upper and lower portions of the porous plate 50 is left, right area In order to control the rapid fluid by increasing the primary block, a plurality of transfer holes 52 are formed at one end surface of the porous plate 50 other than the through-hole 51 so that the controlled fluid can be transferred for a while. .

In addition, the porous plate 50 is installed on the inner circumference of the expansion pipe 40, the plurality of porous plates 50, each provided with a predetermined interval apart from each other, the plurality of porous plates 50 It is interconnected by fixing members such as bolts and nuts, and at least one of the plurality of porous plates 50 is fixed to the inner circumference of the expansion pipe 40 by welding or the like.

In addition, the plurality of porous plates 50 are provided with the through-holes 51 having a rhombus shape alternately at right angles to each other. That is, when the disk 20 is opened, the porous plate 50 that first comes into contact with the fluid is installed so that the long axis of the rhombus through hole 51 is horizontal, and then the porous plate 50 is formed of the rhombus through hole 51. ), And the perforated plate 50 crosses each other when the rhombus through-hole 51 is viewed from the front as shown in FIG. 3 in such a manner that the long axis of the rhombus through-hole 51 is horizontal. Perforated plate is installed in the form.

As such, after the fluid is first blocked by the porous plate 50, the fluid is transported at a slow speed through the transfer hole 52 and the through hole 51, and then the second and third portions are passed through the porous plate 50. It is controlled by car and car 4 to prevent cavitation phenomenon.

1 and 2, the rubber seal 60 is formed in a ring shape made of a material of elastic force is provided on the outer periphery of the expansion pipe 40, the rubber seal 60 is a joint pipe 30 ) And the expansion tube 40 serves to seal the fluid and foreign matter from entering / discharging through.

In this case, the rubber sealing 60 is expanded toward the rear, that is, formed in the form of the front narrow backlight to increase the sealing force.

1 and 2, the support portion 70 is formed in the shape of a ring is provided on the outer periphery of the expansion tube 40, the support portion 70 presses the rear side of the rubber seal 60 The rubber seal 60 is to support so that the rubber seal is not separated.

Here, the plate 71 is integrally formed on the outer circumference of the support part 70 so as to be connected to the plate 31 of the fitting pipe 30 by fixing members such as bolts and nuts, and the support part 70 is connected to the outer periphery of the support part 70. By being fixed to the pipe | tube 30, the said rubber sealing 60 can be supported.

Then, one end surface of the support portion 70, that is, the surface in contact with the rubber seal 60, the support protrusion 72 is formed to protrude so as not to be out of place while pressing the rubber seal 60, the support protrusion 72 Presses and supports the upper side of the rubber seal 60.

10: body 11,31,71: plate
20: disc 21: axis
30: joint pipe 32: space groove
40: expansion pipe 41: flange
50: perforated plate 51: through hole
52: transfer hole 60: rubber sealing
70: support portion 72: support protrusion
100: Butterfly Valve

Claims (3)

In the butterfly valve 100 is installed between the pipe and the pipe to intermittently flow the fluid flowing through the body 10 by the rotation of the disk 20,
A joint pipe 30 which is detachable at an outlet side of the body 10 and has a plate 31 formed at both ends in a cylindrical shape;
One side is inserted into the inside of the fitting pipe 30, the other side is a flange 41 is formed so as to be connected to the pipe and the elastic pipe 40 to absorb and offset the vibration and expansion of the pipe;
A plurality of fixedly spaced apart from each other in the inner periphery of the expansion pipe 40, the opening of the disc 20, the through-hole 51 of the rhombus shape in each center to prevent the cavitation by controlling the fluid flowing rapidly ) Is formed, and the plurality of through holes 51 are provided with staggered mutually at right angles to each other;
A rubber seal (60) provided at an outer circumference of the expansion pipe (40) to seal the fluid and foreign substances from entering / exhaust through the joint pipe (30) and the expansion pipe (40);
It is provided on the outer periphery of the expansion pipe 40 to support the rear side of the rubber seal 60 to prevent the rubber seal 60 from being separated, and the plate 31 of the joint pipe 30 on the outer periphery It is configured to include; support portion 70 is formed with a plate 71 to be connected by a fixing member,
The plurality of porous plates 50 are interconnected by fixing members of bolts and nuts, the long axis length of the rhombus-shaped through hole 51 is formed to the edge of the porous plate 50, the through hole ( One end surface other than 51) is formed with a plurality of transfer holes 52 so that the fluid to control the flow rate is transferred,
An end portion of the joint pipe 30 in contact with the rubber seal 60 is formed to be inclined inward to closely contact the rubber seal 60 to prevent a gap, and the rubber seal 60 may also be connected to the joint pipe 30. Cavitation prevention butterfly valve, characterized in that the contact portion is formed inclined.
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KR1020100108725A 2010-11-03 2010-11-03 Cavitation check for butterfly valve KR101037920B1 (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
KR1020100108725A KR101037920B1 (en) 2010-11-03 2010-11-03 Cavitation check for butterfly valve

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101388175B1 (en) * 2013-08-19 2014-04-22 알피엠컨트롤 주식회사 Water hammer prevent fluid valve
KR101600956B1 (en) 2015-12-24 2016-03-09 주식회사현대밸브 Closed automatically by a built-in auxiliary check valve butterfly valve
KR20160081045A (en) 2014-12-30 2016-07-08 동아대학교 산학협력단 Gate valve for preventing of cavitation and vibration
KR20190065891A (en) 2017-12-04 2019-06-12 동아대학교 산학협력단 Butterfly Valve with Disc for Cavitation Reduction
KR20200045101A (en) * 2018-10-22 2020-05-04 주식회사 기하정밀 Cone valve with multi hole plate
CN114542727A (en) * 2022-02-23 2022-05-27 李德贵 Industrial butterfly valve
KR102458568B1 (en) * 2022-06-23 2022-10-24 김선애 Cavitation prevention device of butterfly valve

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100938145B1 (en) * 2009-10-06 2010-01-22 (주) 삼진정밀 Cavitation check for butterfly valve

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100938145B1 (en) * 2009-10-06 2010-01-22 (주) 삼진정밀 Cavitation check for butterfly valve

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101388175B1 (en) * 2013-08-19 2014-04-22 알피엠컨트롤 주식회사 Water hammer prevent fluid valve
KR20160081045A (en) 2014-12-30 2016-07-08 동아대학교 산학협력단 Gate valve for preventing of cavitation and vibration
KR101600956B1 (en) 2015-12-24 2016-03-09 주식회사현대밸브 Closed automatically by a built-in auxiliary check valve butterfly valve
KR20190065891A (en) 2017-12-04 2019-06-12 동아대학교 산학협력단 Butterfly Valve with Disc for Cavitation Reduction
KR20200045101A (en) * 2018-10-22 2020-05-04 주식회사 기하정밀 Cone valve with multi hole plate
KR102190725B1 (en) * 2018-10-22 2020-12-14 주식회사 기하정밀 Cone valve with multi hole plate
CN114542727A (en) * 2022-02-23 2022-05-27 李德贵 Industrial butterfly valve
KR102458568B1 (en) * 2022-06-23 2022-10-24 김선애 Cavitation prevention device of butterfly valve

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