KR101475846B1 - Diaphragm adhere to seat and diaphragm valve with the same - Google Patents

Diaphragm adhere to seat and diaphragm valve with the same Download PDF

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Publication number
KR101475846B1
KR101475846B1 KR20140040523A KR20140040523A KR101475846B1 KR 101475846 B1 KR101475846 B1 KR 101475846B1 KR 20140040523 A KR20140040523 A KR 20140040523A KR 20140040523 A KR20140040523 A KR 20140040523A KR 101475846 B1 KR101475846 B1 KR 101475846B1
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KR
South Korea
Prior art keywords
diaphragm
curved
membrane
valve
film
Prior art date
Application number
KR20140040523A
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Korean (ko)
Inventor
김형수
Original Assignee
아성플라스틱밸브(주)
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Publication of KR101475846B1 publication Critical patent/KR101475846B1/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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0236—Diaphragm cut-off apparatus
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • 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
    • F16K51/00—Other details not peculiar to particular types of valves or cut-off apparatus
    • 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
    • F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
    • F16K7/12—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Driven Valves (AREA)

Abstract

The present invention relates to a diaphragm and a diaphragm valve having the same and, more specifically, to a diaphragm adhering to a seat, which is formed to adhere to a valve seat and improves the control performance of fluid, and a diaphragm valve having the same. The diaphragm is installed in a transfer part lifted up and down by a handle part of the diaphragm valve and controls fluid.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a diaphragm for a diaphragm,

The present invention relates to a diaphragm, and more particularly, to a diaphragm having a sheet-tight contact type and a diaphragm valve having the diaphragm capable of improving fluid interception performance by forming the diaphragm in close contact with a valve seat,

Generally, diaphragm valves are classified into Weir, Straightway, and Angle.

The diaphragm valve is characterized in that the body (structurally classified) type has a weir in the center of the body in the case of a weir type, has a shorter inter-plane length than the straight-through type, has a longer diaphragm life, , It is possible to use hard material such as PTFE, it is suitable for the purpose of complete opening / closing and can be used for controlling the flow rate, and the flow resistance value (Cv) is large when the fluid resistance is small.

In the case of the straight-way type, the pressure loss is small because the inner diameter of the valve is almost the same as the inner diameter of the valve. The length of the valve is long and the life of the diaphragm is shorter than that of the weir.

In the case of the angle type, a structure in which the stem is short in length, the valve seat contact is close to the surface contact, and the seat is operated in the 45 ° direction requires a structure in which the stem is fixed in one direction.

It is suitable for control purposes, has a very large flow capacity with less pressure loss, and is able to close gently with no pressure surge.

The advantage of such a diaphragm valve is that it is simple in structure, the diaphragm isolates the inner fluid, the stuffing box is not contaminated, the stem does not need a stuffing box (gland packing) It is easy to repair because it can control the flow rate, has a small pressure loss, is easy to repair, and is easy to disassemble and assemble.

A conventional diaphragm valve 1 having such structural features will be briefly described with reference to Fig.

The conventional diaphragm valve 1 includes a valve lower body 10, a diaphragm 20, a valve upper body 30, and a handle 40. As shown in FIG.

The valve lower body 10 has flanges 11 for connection or fastening to the other piping members by connecting members such as bolts and nuts at both ends thereof and is cast into a valve shape by a metal casting.

Further, the valve lower body 10 is painted by powder coating or the like in order to prevent corrosion and improve appearance.

A valve seat (13) for interrupting the fluid is formed at the center of the flow path inside the valve lower body (10). The diaphragm 20 is moved in the vertical direction by the vertical movement of the diaphragm 20 in accordance with the rotation operation of the handle portion 40 so that the liquid (chemical solution) And performs a function of interrupting by closing or opening the flow path 12 in contact with or spaced from the valve seat 13 formed in the center of the flow path.

As described above, in the conventional diaphragm valve 1, the diaphragm 20 is lowered to contact the valve seat 13 in order to interrupt the flow of the fluid.

In this case, the diaphragm 20 of the conventional diaphragm valve 1 is formed so that the central portion of the diaphragm 20 protrudes upward in the drawing, The diaphragm 20 is lowered and brought into close contact with the valve seat 13.

However, in the case of the conventional diaphragm 20 as described above, since the diaphragm 20 is formed so as to protrude upward so as to flow fluid and is then deformed to be in close contact with the valve seat 13, Is not in close contact with the valve seat 13, so that the interruption of the fluid is not perfect.

On the other hand, the above-described diaphragm valve itself is a well-known technique and is described in detail in the following prior art documents in detail, so that redundant description and illustration are omitted.

Korean Registered Utility Model No. 20-0280434 Korean Registered Utility Model No. 20-0338649 Korean Public Utility Model No. 20-2010-0009088

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a diaphragm of sheet-contact type which is formed in a shape for blocking fluid when forming a diaphragm, And an object of the present invention is to provide a diaphragm valve having the same.

In order to accomplish the above object, the present invention provides a diaphragm 100 that is installed in a diaphragm valve 1 and interrupts fluid, wherein the diaphragm 100 is seated on a seating surface 14 of a lower valve body 10, And a curved surface portion 100-2 in which a central portion of the flat portion 100-1 is downwardly bent. The flat portion 100-1 has a flat surface 100-1, The bottom surface of the curved surface portion 100-2 is brought into close contact with the valve seat 13 protruding from the flow path 12 of the diaphragm valve 1 Feature.

The diaphragm 100 includes a triple membrane diaphragm 100C composed of an upper membrane 140 and a lower membrane 160 stacked in a vertical direction, Shaped lower flat portion 161 which is seated on the seating surface 14 of the body 10 and is formed with a fixing hole 161a for fixing the fixing member to the seating surface 14, A mounting portion 164 protruding upwardly from a bottom surface of the upper surface of the lower curved portion 162 and a mounting portion 164 mounted on the mounting portion 164 to connect the diaphragm valve And a tight fitting portion 163 which is in close contact with the valve seat 13 as a bottom face of the curved face portion 162. The intermediate membrane 150 is fixed to the lower portion of the lower portion of the valve seat 13, A fixing hole 151a is formed on the lower flat portion 161 of the membrane 160 to allow the fixing hole to pass therethrough, An intermediate curved portion 152 for curving the central portion of the intermediate flat portion 151 downward and coming into close contact with an upper portion of the lower curved portion 162, And an intermediate recessed portion 154 formed with a through hole 154a through which the fitting portion F is inserted while the mounting portion 164 is inserted into the intermediate membrane 150. The upper membrane 140 is connected to the intermediate membrane 150 An upper flat portion 141 formed on the intermediate flat portion 151 of the upper flat portion 141 to form a fixing hole 141a through which the fixing hole passes, And an upper curved portion 142 closely contacting the upper portion of the upper curved portion 142 and a portion of the bottom surface of the upper curved portion 142 being recessed to insert the intermediate recessed portion 154, And an upper recessed groove part 144 in which a hole 144a is formed. The upper membrane 140 and the intermediate membrane 150 When the lower flat portion 161 of the lower film 160 is seated on the seating surface 14 in a state where the lower film 160 is engaged with the lower flat portion 160 of the diaphragm valve 1, Or may be formed to be in close contact with the valve seat 13 protruding from the flow path 12.

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The upper film 140 may be formed of EPDM, the intermediate film 150 may be made of PVDF, and the lower film 160 may be made of Teflon.

Further, the present invention has another feature in the diaphragm valve including the diaphragm.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

According to the present invention, since the diaphragm shape is formed after being formed in a shape to close the fluid, that is, in a shape close to the valve seat, the diaphragm can be completely blocked.

1 is a conceptual diagram showing a structure of a general diaphragm valve.
Figures 2 and 3 are exploded perspective views illustrating a diaphragm according to one embodiment of the present invention.
4 is a conceptual diagram illustrating a single film structure as a diaphragm according to an embodiment of the present invention.
5 is a conceptual diagram for explaining a case of a diaphragm structure according to another embodiment of the present invention.
6 is a conceptual diagram illustrating a triple-layer structure as a diaphragm according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

In addition, the following embodiments are not intended to limit the scope of the present invention, but merely as exemplifications of the constituent elements set forth in the claims of the present invention, and are included in technical ideas throughout the specification of the present invention, Embodiments that include components replaceable as equivalents in the elements may be included within the scope of the present invention.

FIG. 4 is a conceptual view for explaining a case of a single membrane structure as a diaphragm according to an embodiment of the present invention, and FIG. 5 FIG. 6 is a conceptual diagram for explaining a case where a diaphragm structure is used as a diaphragm according to another embodiment of the present invention, and FIG. 6 is a conceptual diagram for explaining a case where a diaphragm structure is used as a diaphragm structure according to another embodiment of the present invention.

Example

The diaphragm 100 according to an embodiment of the present invention includes a disk-shaped flat portion 100-1 which is seated on the seating surface 14 of the lower valve body 10 as shown in Figs. 2 and 3, And a curved portion 100-2 in which the central portion of the flat portion 100-1 is bent downward. The bottom surface of the curved surface portion 100-2 protrudes from the flow path 12 of the diaphragm valve 1 when the flat portion 100-1 is seated on the seating surface 14, (13).

That is, the diaphragm 100 of the present invention is formed on the basis of a time when the valve seat 13 side is lowered to intermit the flow of the fluid. As described above, the flat portion 100-1 is supported by the seating surface 14 The bottom surface of the curved surface portion 100-2 is formed in close contact with the valve seat 13 protruding from the flow path 12 of the diaphragm valve 1. [

Accordingly, since the diaphragm 100 according to the present invention is formed on the basis of the case where the flow of the fluid is blocked, the valve seat 13 and the seating surface 14 are lifted to flow the fluid in actual use, The fluid can be completely blocked.

Meanwhile, the diaphragm 100 of the present invention may have various shapes and configurations, but it is also possible to include a single membrane diaphragm 110 composed of a single membrane as shown in FIG.

The single membrane diaphragm 110 is seated in a seating surface 14 (see FIGS. 1 to 3, hereinafter the same) of the lower valve body 10 (see FIGS. 1 to 3, hereinafter the same) And a flat plate portion 111 having a fixing hole 111a for fixing a fixture (not shown) to the surface 14 is formed.

A mounting part 114 protruding upwardly from a bottom surface of the upper surface of the curved surface part 112 and a mounting part 114 mounted on the mounting part 114, A fitting F fixed to the transferring part 21 of the frame valve 1 and a tight fitting part 113 tightly attached to the valve seat 13 as a bottom surface of the curved part 112.

That is, when the single membrane diaphragm 110 of the present invention is seated on the seating surface 14 of the lower valve body 10 as described above, the contact portion 113, which is the bottom surface of the curved surface portion 112, And is formed to be in close contact with the valve seat 13 protruding from the flow path 12 (see Figs. 1 to 3, hereinafter the same) of the valve 1.

In other words, when the single membrane diaphragm 110 of the present invention is formed and installed in a shape for blocking the fluid, the flow of fluid can be more completely blocked in actual use.

4 and may be inserted into the insertion hole 21a of the transfer unit 21 shown in FIGS. 2 and 3 by using a configuration such as a bolt or the like, The diaphragm 110 can be interlocked with the upward and downward movement of the conveying unit 21. [

That is, when the transfer part 21 rises, the curved part 112 and the close part 113 are deformed and raised so that fluid flows. When the transfer part 21 is lowered, The adhered portion 113 is lowered. At this time, since the valve body is already formed in close contact with the valve seat 13, the flow of the fluid can be completely blocked.

For this, the single membrane diaphragm 110 may be made of various rubber materials having elasticity.

The mounting portion 114 protrudes from the bottom of the upper surface of the curved portion 112 to mount the connecting port F and may have various shapes. However, as shown in FIG. 4, the mounting portion 114 may have a rectangular cross- It is also possible that the connector F is built in.

The diaphragm of the present invention may include a dual membrane diaphragm 100B, which may be an upper membrane 120 and a lower membrane 130, stacked vertically, as shown in FIG.

At this time, the lower film 130 is seated on the seating surface 14 of the gating lower valve body 10 as shown in the figure, and a fixing hole 131a for fixing the fixing member is formed on the seating surface 14 A lower curved portion 132 bent downward at a central portion of the lower flat portion 131 and a lower curved portion 132 curved upward in a bottom direction of the upper surface of the lower curved portion 132, A connection F mounted on the lower mounting part 134 and fixed to the transfer part 21 of the diaphragm valve 1 and a valve seat 13 fixed to the valve seat 13 as a bottom surface of the lower curved part 132. [ , Which is similar to the single membrane diaphragm 110 described above.

The upper film 120 is closely adhered on the lower flat portion 131 of the lower film 130 and includes an upper flat portion 121 for forming a fixing hole 121a through which the fixing hole passes, An upper curved portion 122 curved downward at a central portion of the upper flat portion 121 to closely contact the lower curved portion 132 and a portion of the lower curved surface of the upper curved portion 122 is recessed, And a recessed portion 124 in which a through hole 124a through which the connector F passes is formed.

That is, the upper film 120 and the lower film 130 have a generally similar shape so that the upper film 120 can be closely contacted on the lower film 130, Grooves 124 are formed so as to be inserted into the film 120.

At this time, the fixing hole 121a of the upper film 120 and the fixing hole 131a of the lower film 130 are formed so as to have the same center so as to penetrate the fixing hole not shown.

When the lower flat portion 131 of the lower film 130 is seated on the seating surface 14 in a state where the upper film 120 and the lower film 130 of the present invention are coupled to each other, Is formed in close contact with the valve seat (13) protruding from the flow path (12) of the diaphragm valve (1).

Meanwhile, the upper film 120 may be made of EPDM and the lower film 130 may be made of Teflon.

The term "EPDM" is widely known as "ethylene propylene diene M-class" as a thermoplastic synthetic rubber obtained by ternary copolymerization of ethylene, propylene and diene. Such EPDM is excellent in weatherability and can maintain its flexibility even at minus 40 to 50 degrees, and thus can be used for a diaphragm valve as in the present invention.

As used herein, the term "Teflon" refers to polytetrafluoroethylene (PTFE), which has heat resistance, non-tackiness, and low coefficient of friction, and can be used in a diaphragm valve as in the present invention.

The diaphragm 100 of the present invention includes a triple membrane diaphragm 100C as an upper membrane 140 and an upper membrane 160 laminated in the vertical direction as shown in FIG. It is possible.

At this time, the lower film 160 is seated on the seating surface 14 of the lower valve body 10 and has a circular plate-shaped lower portion 160a in which a fixing hole 161a for fixing the fixing member is formed on the seating surface 14 A lower curved portion 162 bent downward at a central portion of the lower flat portion 161 and a mounting portion 164 protruding upward from a bottom surface of the upper curved portion 162; A fitting F mounted on the mounting portion 164 and fixed to the conveying portion 21 of the diaphragm valve 1 and a tight fitting portion 163 tightly fitted to the valve seat 13 as a bottom surface of the curved portion 162 .

That is, it can have a shape similar to that described above, and is different from triple-layer structure.

The intermediate membrane 150 disposed on the lower membrane 160 is in close contact with the lower flat portion 161 of the lower membrane 160 to form a fixing hole 151a through which the fixing hole passes, A middle curved surface portion 152 that is bent downward at a central portion of the intermediate flat portion 151 and is brought into close contact with an upper portion of the lower curved surface portion 162; And an intermediate recessed portion 154 formed with a through hole 154a through which the connection portion F is inserted while the mounting portion 164 is inserted.

That is, the intermediate membrane 150 has a shape similar to that of the lower membrane 160, but a recessed portion 154 for inserting the mounting portion 164 of the lower membrane 160 is formed.

The upper film 140 disposed on the intermediate film 150 is closely adhered on the middle flat portion 151 of the intermediate film 150 and is formed as an upper flat film 141a for forming a fixing hole 141a through which the fixing hole passes, An upper curved portion 142 which is bent downward at a central portion of the upper flat portion 141 and is brought into close contact with the upper portion of the intermediate curved portion 152 and a portion of the bottom surface of the upper curved portion 142 is recessed And an upper recessed portion 144 formed with a through hole 144a through which the intermediate recessed portion 154 is inserted and the connector F is inserted therethrough.

When the lower flat portion 161 of the lower film 160 is seated on the seating surface 14 in a state where the upper film 140, the middle film 150 and the lower film 160 are coupled to each other, Is formed in close contact with the valve seat (13) protruding from the flow path (12) of the diaphragm valve (1).

Meanwhile, the upper film 140 may be made of EPDM, the intermediate film 150 may be made of PVDF, and the lower film 160 may be made of Teflon.

EPDM and Teflon are as described above. Polyvinylidene fluoride (PVDF) is widely known as fluororesin (fluorine resin), and has excellent thermal stability and is frequently used in diaphragm valves as in the present invention .

When the diaphragm 100 of the present invention described above is mounted on the diaphragm valve, the fluid can be more completely interrupted as described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification or improvement is possible.

It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

110: single film 111: flat part
112: curved surface portion 113:
120: upper film 121: flat part
122: curved portion 123: tight contact portion
130: lower film 131:
132: curved portion 133:
140: upper film 141: flat part
142: curved surface portion 143:

Claims (8)

A diaphragm (100) provided in a transfer part (21) raised and lowered by a handle part (40) of a diaphragm valve (1)
The diaphragm 100 includes a disk-shaped flat part 100-1 which is seated on the seating surface 14 of the lower valve body 10, a curved part 100-1, (100-2)
A bottom surface of the curved surface portion 100-2 protrudes from the flow path 12 of the diaphragm valve 1 when the flat portion 100-1 is seated on the seating surface 14, As shown in FIG.
The diaphragm 100 includes a triple membrane diaphragm 100C consisting of an upper membrane 140 intermediate layer 150 and a lower membrane 160 stacked in the vertical direction,
The lower film 160 is seated on the seating surface 14 of the lower valve body 10 and has a fixing plate 161a for fixing the fixing member to the seating surface 14, A lower curved portion 162 bent downward at a central portion of the lower flat portion 161 and a mounting portion 164 protruding upward from a bottom surface of the upper curved portion 162, And a tight fitting portion 163 which is tightly fitted to the valve seat 13 as a bottom surface of the curved surface portion 162. The connecting portion F is fixed to the feeding portion 21 of the diaphragm valve 1, ,
The middle membrane 150 is in close contact with the lower flat portion 161 of the lower membrane 160 and includes an intermediate flat portion 151 for forming a fixing hole 151a through which the fixing hole passes, The intermediate curved portion 152 is bent at a central portion of the curved portion 151 to be brought into close contact with the upper curved portion 162 and a portion of the bottom surface of the curved middle portion 152 is recessed to insert the mounting portion 164, And an intermediate recessed portion (154) in which a through hole (154a) through which the connector (F) passes is formed,
The upper film 140 is closely adhered on the middle flat portion 151 of the intermediate film 150 and includes an upper flat portion 141 for forming a fixing hole 141a through which the fixing hole passes, An upper curved portion 142 that is bent downward at a central portion of the upper curved portion 141 and closely adhered to the upper portion of the curved middle portion 152 and a portion of the lower curved portion of the upper curved portion 142 is recessed, And an upper recessed portion 144 formed with a through-hole 144a through which the connector F passes,
When the lower flat portion 161 of the lower film 160 is seated on the seating surface 14 in a state where the upper film 140, the middle film 150 and the lower film 160 are coupled to each other, Is formed to be in close contact with a valve seat (13) formed to protrude from a flow path (12) of the diaphragm valve (1).
delete delete delete delete delete The method according to claim 1,
Wherein the upper membrane (140) is made of EPDM, the intermediate membrane (150) is made of PVDF, and the lower membrane (160) is made of Teflon.
A diaphragm valve comprising the diaphragm of any one of claims 1 to 7.
KR20140040523A 2013-10-31 2014-04-04 Diaphragm adhere to seat and diaphragm valve with the same KR101475846B1 (en)

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KR20130131171 2013-10-31

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101995665B1 (en) 2018-03-21 2019-07-02 김점석 Diaphragm-based fabrics woven into aramid w cover rings and aramid w cover rings for the slag weaving of the diaphragm

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63137175U (en) * 1987-02-28 1988-09-09
JP2005133767A (en) * 2003-10-28 2005-05-26 Sekisui Chem Co Ltd Diaphragm valve
KR100903660B1 (en) * 2007-06-18 2009-06-18 주식회사 퓨어라인 Diaphragm, manufacturing method thereof, diaphragm valve having the same
KR100982705B1 (en) * 2005-08-30 2010-09-17 가부시키가이샤 후지킨 Direct-touch type metal diaphragm valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63137175U (en) * 1987-02-28 1988-09-09
JP2005133767A (en) * 2003-10-28 2005-05-26 Sekisui Chem Co Ltd Diaphragm valve
KR100982705B1 (en) * 2005-08-30 2010-09-17 가부시키가이샤 후지킨 Direct-touch type metal diaphragm valve
KR100903660B1 (en) * 2007-06-18 2009-06-18 주식회사 퓨어라인 Diaphragm, manufacturing method thereof, diaphragm valve having the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101995665B1 (en) 2018-03-21 2019-07-02 김점석 Diaphragm-based fabrics woven into aramid w cover rings and aramid w cover rings for the slag weaving of the diaphragm

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