US20210404558A1 - Flap valve sealing arrangement - Google Patents

Flap valve sealing arrangement Download PDF

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Publication number
US20210404558A1
US20210404558A1 US17/138,759 US202017138759A US2021404558A1 US 20210404558 A1 US20210404558 A1 US 20210404558A1 US 202017138759 A US202017138759 A US 202017138759A US 2021404558 A1 US2021404558 A1 US 2021404558A1
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United States
Prior art keywords
sealing
flap
valve
flow channel
disc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US17/138,759
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English (en)
Inventor
Rudolf Kappe
Martin Adams
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Adams Gmbh
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Publication of US20210404558A1 publication Critical patent/US20210404558A1/en
Abandoned legal-status Critical Current

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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
    • F16K1/2263—Shaping or arrangements of the sealing the sealing being arranged on the valve seat
    • 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
    • F16K1/16—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
    • F16K1/2261—Shaping or arrangements of the sealing the sealing being arranged on 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
    • F16K1/2263—Shaping or arrangements of the sealing the sealing being arranged on the valve seat
    • F16K1/2266—Shaping or arrangements of the sealing the sealing being arranged on the valve seat and being forced into sealing contact with the valve member by a spring or a spring-like 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
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/01—Damping of valve members
    • F16K47/012—Damping of valve members by means of a resilient damping element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing

Definitions

  • flap valves also known in the English-speaking world as “butterfly valves”.
  • a flap valve comprises a valve body defining a flow channel for the flow of a liquid or gaseous fluid and a flap valve disc mounted on the valve body and pivoting about a pivot axis.
  • the dimensions and shape of the flap valve disc correspond to the cross-section of the flow channel.
  • the valve disc can be swiveled about a swivel axis between a closed position and an open position. In the closed position, the valve disc rests with a sealing surface on the outer circumference of the flap valve disc against an annular sealing lip assembly located on the inner circumference of the flow channel and in the closed position blocks the flow of liquid or gaseous fluid through the flow channel. In the open position, the fluid flows around the flap valve disc and can pass through the flow channel.
  • a flap valve including: a valve body designed for installation between two sections of a pipeline and provided with a flow channel for the flow of a fluid, a valve disc arranged in the flow channel and pivotable between a closed position and an open position and mounted on the valve body, this valve disc shutting off the flow of the fluid in the closed position and opening the passage of the fluid in the open position, and an annular sealing lip arrangement which is fastened to the inner circumference of the flow channel, surrounds the flow channel and has two annular sealing lips which consist of elastic material.
  • the two annular sealing lips are arranged at a distance from one another in the direction of flow, bear with their inner sealing edges under elastic prestress against a sealing surface located on the outer circumference of the valve disc when the valve disc is in the closed position, thereby forming an annular cavity surrounding the sealing surface of the valve disc.
  • Sealing lip arrangements with elastically yielding sealing lips have the advantage over non-elastic seals that the drive torques required to open and close the valve disc remain relatively low.
  • flap valves are described in DE 28 29 066 C2, EP 0 412 229 B1 and DE 195 15 014 A1.
  • the cross-sectional areas of the two sealing lips of the sealing lip arrangement are inclined or bent outwards in relation to an annular cavity defined between the two sealing lips, i.e. against the direction of flow of the fluid, for example as shown in FIG. 5 .
  • the present technology relates to a flap valve wherein the cross-sectional areas of the two sealing lips of the sealing lip arrangement are inclined and/or bent towards the interior of the annular cavity.
  • the fluid may enter the annular cavity between the two sealing lips slowly and without destroying the sealing lip on the high pressure side.
  • the fluid entering the annular cavity builds up a counter-pressure within the annular cavity which supports the sealing lip on the high pressure side from its interior side, so that the sealing lip on the high pressure side is protected against the uncontrolled passage of fluid or destruction.
  • the sealing edge of this sealing lip on the high pressure side contacts with the sealing edge of the sealing surface of the valve disc with the sealing effect predetermined by the elastic pretension of the sealing lip.
  • the two sealing lips of the sealing lip assembly may be attached to a support ring which is insertable into a matching annular recess on the inner circumference of the flow channel of the valve body.
  • the sealing lips which may be made of stainless steel, may be welded to the support ring.
  • the two sealing lips and/or the back-up ring are manufactured in an additive process from metallic materials with elasticity and hardness adapted to local requirements. This makes it possible to adapt the sealing lip arrangements to the requirements with regard to their dimensions and their shape and material properties.
  • the annular cavity located between the sealing lips may be connected to a pressure fluid channel leading out of the valve housing. This pressure medium channel leading out of the valve body may be connected to a pressure medium source. This makes it possible to influence the pressure prevailing in the annular cavity between the sealing lips and thus the sealing effect of the sealing lips in a targeted manner by pressurizing or reducing the pressure, for example depending on the pressure difference across the flap valve.
  • the pressure medium channel leading out of the valve housing may be connected to a lockable collecting device for leakages. This is beneficial in removing residual medium from the annular cavity.
  • the pressure medium duct leading out of the valve housing may be provided with a supply device for providing a setting and/or hardening sealing agent.
  • a supply device for providing a setting and/or hardening sealing agent.
  • sealing agents which may be used in an emergency, may permanently block the flap valve in the closed position and subsequently make it necessary to remove the entire sealing lip arrangement. According to the present technology, this emergency use is particularly promising for the flap valve because the sealing agent can be filled in at particularly high pressure due to the special design and arrangement of the sealing lips.
  • Embodiments of the present technology relate to methods of using embodiments of the flap valves as disclosed herein.
  • the present technology relates to a method for increasing the sealing effect of a flap valve, in which the pressure medium channel leading out of the valve housing is connected to a pressure medium source, this method being characterized in that, after the flap disc has reached the closed position, the annular cavity located between the sealing lips is pressurized by means of the pressure medium source via the pressure medium channel.
  • the present technology relates to a method for observing and/or monitoring leaks on a flap valve, in which the pressure medium channel leading out of the valve housing is connected to a collectors device which can be shut off, this method being characterized in that, when the flap disc is in the closed position, the annular cavity located between the sealing lips is connected to the collector device via the pressure medium channel and is kept under observation.
  • the present technology relates to a method for the emergency shut-off of a flap valve, in which the pressure medium channel leading out of the valve housing is connected to a supply for a setting and/or hardenable sealing agent, this method being characterized in that, when the flap disc is in the closed position, the annular cavity located between the sealing lips is acted upon by the setting and/or hardenable sealing agent via the pressure medium channel, the filling pressure of the sealing agent being greater than the pressure of the fluid flowing through the flap valve at the flap valve.
  • the sealing lip arrangement according to the present technology may be coupled to the outer circumference of the valve disc additionally or alternatively to the valve body.
  • the present technology relates to a flap valve including a valve body designed for installation between two sections of a pipeline and provided with a flow channel for the flow of a fluid.
  • the flap valve further may comprise a valve disc arranged in the flow channel and pivotable between a closed position and an open position and mounted on the valve housing, this valve disc shutting off the flow of the fluid in the closed position and opening the passage of the fluid in the open position.
  • the flap valve further may comprise an annular sealing surface which is arranged on the inner circumference of the flow channel of the valve housing and against which, when the valve disc is in the closed position, a sealing lip arrangement arranged on the outer circumference of the valve disc rests, which sealing lip arrangement has two elastic sealing lips which are arranged at a distance from one another in the direction of flow and which, when the valve disc is closed, rest with their outer sealing edges under elastic prestress against the sealing surface of the housing, thereby forming an annular cavity surrounding the valve disc.
  • This flap valve may be characterized by the cross-sectional surfaces of the two sealing lips of the sealing lip arrangement being inclined and/or curved towards the interior of the annular cavity.
  • the two sealing lips of the sealing lip arrangement may be attached to a support ring, which in this case can be inserted into a suitable annular recess on the outer circumference of the valve disc so that the sealing lip arrangement is replaceable.
  • the sealing lips and/or the support ring are manufactured in an additive process from metallic materials with elasticity and hardness adapted to local requirements.
  • FIG. 1 shows a cross-section of a flap valve in the closed position with a sealing arrangement according to embodiments of the present technology.
  • FIG. 2 shows an enlarged detail A from FIG. 1 .
  • FIG. 3 shows a cross-section of a first design of the back-up ring and the sealing lips attached thereto according to embodiments of the present technology.
  • FIG. 4 shows a cross-section of a second design of the back-up ring with the sealing lips attached thereto according to embodiments of the present technology.
  • FIG. 5 shows schematically the pressurization of a double lip arrangement according to the state of the art.
  • FIG. 6 shows schematically the pressurization of a double lip arrangement according to embodiments of the present technology.
  • FIG. 7 schematically shows the arrangement of a flap valve according to embodiments of the present technology in a pipeline together with the connectable additional units.
  • FIG. 8 shows a flap valve similar to FIG. 2 , in which the sealing lip arrangement is located on the outer circumference of the valve disc according to embodiments of the present technology.
  • FIG. 1 shows an embodiment of a flap valve according to the present technology, which is designated in its entirety by the reference sign 100 .
  • the flap valve 100 has a valve body 1 surrounding a flow channel 200 through which a liquid and/or gaseous fluid can flow.
  • Valve body 1 is also provided at both ends with connecting flanges 2 and 3 , which can be used to connect it to a pipeline 300 (see FIG. 7 ). In this way the flap valve 100 is connected to the pipeline 300 and controls the flow of gaseous or liquid fluid through this pipeline 300 .
  • a circular disc 4 In the flow channel 200 of the valve body 1 there is a circular disc 4 , whose dimensions and shape are adapted to the cross-section of the flow channel 200 .
  • This valve disc 4 is attached to a swivel axis 5 running parallel to a plane of extension of the valve disc 4 and supported in the valve body 1 and can be swiveled between an open position and a closed position by means of this swivel axis 5 .
  • the plane of the flap disc 4 runs essentially parallel to the axis of the flow channel 200 , so that the fluid flowing to the flap valve 100 can pass around the flap disc 4 through the flow channel 200 .
  • the flap disc 4 in contrast, rests with a sealing surface 6 on its outer circumference against an annular sealing lip arrangement 7 , 8 located on the inner circumference of the flow channel 200 and thus blocks the flow of fluid through the flow channel 200 .
  • the sealing surface 6 of the flap disc 4 is conical in shape, because the flap disc 4 is mounted here in multiple eccentricity.
  • the annular sealing lip arrangement 7 , 8 has two annular sealing lips 7 and 8 .
  • These sealing lips are made of a resilient material, such as stainless steel or other suitable elastic material, and are fixed to the inner circumference of the flow channel 200 of valve body 1 , spaced apart in the direction of flow.
  • the two sealing lips 7 and 8 each have an inner sealing edge 7 a and 8 a , respectively, with which they rest under elastic pretension against their sealing surface 6 when the valve disc 4 is in the closed position, and an outer fixing edge 7 b and 8 b , respectively, with which they are fixed to the inner circumference of the flow channel 200 of the valve body 1 .
  • the two sealing lips 7 and 8 form a closed, annular cavity 9 between them in cooperation with the sealing surface 6 of the valve disc 4 .
  • the cross-sectional surfaces of the two sealing lips 7 and 8 of the sealing lip arrangement 7 , 8 are inclined and/or bent towards the interior of this annular cavity 9 , as can be seen particularly well in FIGS. 3 and 4 .
  • This particular inclination and/or bending of these sealing lips 7 and 8 has surprisingly beneficial effects on the sealing behavior, as will be explained below.
  • annular recess 10 is provided on the inner circumference of the passage channel 200 , into which a support ring 11 for the sealing lips 7 and 8 can be inserted.
  • the sealing lips 7 and 8 are clamped in the area of their outer fixing edges 7 b and 8 b in the annular recess 10 with the aid of this support ring 11 .
  • the two stainless steel sealing lips 7 and 8 may be welded to the support ring 11 in the area of their fixing edges 7 b and 8 b .
  • stainless materials other than stainless steel, may also be used.
  • the sealing lips 7 and 8 and/or the back-up ring 11 are manufactured in an additive process from metallic materials with elasticity and hardness adapted to local requirements.
  • the sealing lips 7 and 8 can be made relatively stiff in the area of their outer fixing edges 7 b and 8 b , relatively hard in the area of their inner sealing edges 7 a and 8 a and relatively elastic in the areas in between.
  • this additive process numerous other adaptations to local requirements are envisioned.
  • valve body is marked with a.
  • Two sealing lips b and c are attached to this valve body at which, in the closed position shown, touch a sealing surface e located on a valve disc d.
  • the two sealing lips b and c are inclined or bent outwards in relation to the annular cavity f between them.
  • the annular cavity 9 arranged between the two sealing lips 7 and 8 , in combination with the shape and arrangement of the sealing lips 7 and 8 according to present technology, may be used alone or in combination with additional elements of the flap valve in order to further improve the sealing behavior of the flap valve according to the present technology.
  • the annular cavity 9 may be connected to a pressure fluid channel 14 leading out of the valve body 1 .
  • the pressure medium channel 14 leading out of valve body 1 may be used for various purposes, for example as shown in FIG. 7 . As shown there—but only schematically—the pressure medium channel 14 leading out of valve body 1 can be connected individually or in any combination to: a source of pressure medium 15 , a lockable collecting device 16 for leakages, and/or a feeding device 17 a sealant.
  • the pressure prevailing in the annular cavity 9 between the sealing lips 7 and 8 may be influenced/controlled and thus the sealing effect of these sealing lips may be controlled in a targeted manner by applying or reducing pressure, for example as a function of the pressure difference at the flap valve 1 .
  • the sealing effect of the flap valve may be permanently monitored. For example, as soon as leaks occur, the leaks can be detected by the amount of fluid accumulating in the collecting device 16 .
  • the annular cavity 9 between the two sealing lips 7 and 8 can be pressurized with a setting and/or hardening sealant via the pressure fluid channel 14 with the aid of the sealant supply device 17 . Due to the special design and inclination of the sealing lips 7 and 8 according to the invention, this sealing agent can be introduced into the annular cavity 9 at particularly high pressure, so that an absolutely safe and tight emergency seal can be guaranteed.
  • FIG. 8 shows, in a similar representation to FIG. 2 , an arrangement of a sealing lip arrangement according to the present technology on the outer circumference of the disc of a flap valve.
  • FIG. 8 the body of the flap valve is marked with the reference mark 1001 and provided with connecting flanges 1002 and 1003 for connection of a pipe not shown.
  • a flap disc 1004 which can be pivoted about an unshown pivot axis between a closed position and an open position and is shown in the closed position in FIG. 8 , and which is provided with a sealing lip arrangement 1007 , 1008 on its outer circumference.
  • sealing lips 1007 and 1008 of this sealing lip arrangement which are made of elastic material, are in contact under elastic prestress with a conical, annular sealing surface 1006 , which is located on the inner circumference of the flow channel of the 1200 of the valve body 1001 , in the illustrated closed position of the flap valve.
  • the two sealing lips 1007 and 1008 of the sealing lip arrangement are also here arranged at a distance from each other in the flow direction of the flap valve and form an annular cavity 1009 together with the conical sealing surface 1006 of the valve housing 1001 when the flap disc 1004 is in the closed position.
  • the special feature of this sealing lip arrangement is also here that the cross-sectional surfaces of the two sealing lips 1007 and 1008 of this sealing lip arrangement are inclined and/or curved in the direction of the interior of the annular cavity 1009 .
  • the effect of the sealing lip arrangement connected to the flap disc is the same as for the sealing lip arrangement disclosed above regarding a sealing lip arrangement connected to the valve body, as shown in FIGS. 1-3 .
  • the two sealing lips 1007 and 1008 of the flap valve explained in FIG. 8 may be attached to a support ring 1011 , which can be inserted into a matching annular recess 1010 on the outer circumference of the flap disc 1004 .
  • the back-up ring 1011 and/or the sealing lips 1007 and 1008 are also manufactured in an additive process.
  • valves including: a centric design in which the swivel axis of the disc passes through the center of the seal assembly which is centered around the axis of the flow channel, a single eccentric design, in which the swivel axis of the disc is axially displaced in the flow direction along the axis of the flow channel, a double-eccentric design, in which, in addition to the single-eccentric design, the swivel axis of the valve disc is displaced perpendicular to the axis of the flow channel, and a triple-eccentric design, in which, in addition to the double-eccentric design, the plane of the annular sealing arrangement is no longer perpendicular to the axis of the flow channel.
  • the present technology relates to flap valves of all designs.
  • the invention comprises any combination of the elements described above in all possible variations unless otherwise indicated in the description or unless the context clearly contradicts it.
  • the above description uses a specific nomenclature for explanatory purposes in order to provide a thorough understanding of the embodiments described. However, it is clear to the professional that certain details are not necessary to perform the described embodiments. Thus, the above descriptions of specific embodiments are presented for illustrative and descriptive purposes only. They are not intended to be exhaustive or to limit the described embodiments to those which are individually disclosed. It is obvious to the average expert that many modifications and variations are possible with respect to the above teachings.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lift Valve (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
US17/138,759 2020-06-30 2020-12-30 Flap valve sealing arrangement Abandoned US20210404558A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2020/068397 WO2022002370A1 (de) 2020-06-30 2020-06-30 Klappenventil

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/068397 Continuation WO2022002370A1 (de) 2020-06-30 2020-06-30 Klappenventil

Publications (1)

Publication Number Publication Date
US20210404558A1 true US20210404558A1 (en) 2021-12-30

Family

ID=71661812

Family Applications (2)

Application Number Title Priority Date Filing Date
US17/138,759 Abandoned US20210404558A1 (en) 2020-06-30 2020-12-30 Flap valve sealing arrangement
US18/013,022 Pending US20230243429A1 (en) 2020-06-30 2021-06-30 Metal seal for a flap valve

Family Applications After (1)

Application Number Title Priority Date Filing Date
US18/013,022 Pending US20230243429A1 (en) 2020-06-30 2021-06-30 Metal seal for a flap valve

Country Status (5)

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US (2) US20210404558A1 (de)
EP (1) EP4025812B1 (de)
CN (1) CN116171358A (de)
ES (1) ES2975523T3 (de)
WO (2) WO2022002370A1 (de)

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CN117052918A (zh) * 2023-09-19 2023-11-14 上海特一阀门制造有限公司 一种具有多重密封缓冲结构的蝶阀

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Publication number Priority date Publication date Assignee Title
CN117052918A (zh) * 2023-09-19 2023-11-14 上海特一阀门制造有限公司 一种具有多重密封缓冲结构的蝶阀

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EP4025812C0 (de) 2023-12-27
WO2022003065A1 (de) 2022-01-06
US20230243429A1 (en) 2023-08-03
ES2975523T3 (es) 2024-07-08
EP4025812A1 (de) 2022-07-13
WO2022002370A1 (de) 2022-01-06
CN116171358A (zh) 2023-05-26
EP4025812B1 (de) 2023-12-27

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