WO2016165806A1 - Vanne à boisseau de commande d'un flux de fluide dans un conduit de fluide d'un instrument medical - Google Patents

Vanne à boisseau de commande d'un flux de fluide dans un conduit de fluide d'un instrument medical Download PDF

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Publication number
WO2016165806A1
WO2016165806A1 PCT/EP2016/000483 EP2016000483W WO2016165806A1 WO 2016165806 A1 WO2016165806 A1 WO 2016165806A1 EP 2016000483 W EP2016000483 W EP 2016000483W WO 2016165806 A1 WO2016165806 A1 WO 2016165806A1
Authority
WO
WIPO (PCT)
Prior art keywords
conical
spring
plug
thread
spring unit
Prior art date
Application number
PCT/EP2016/000483
Other languages
German (de)
English (en)
Inventor
Andreas Rühs
Original Assignee
Olympus Winter & Ibe Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Olympus Winter & Ibe Gmbh filed Critical Olympus Winter & Ibe Gmbh
Publication of WO2016165806A1 publication Critical patent/WO2016165806A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00064—Constructional details of the endoscope body
    • A61B1/00066—Proximal part of endoscope body, e.g. handles
    • A61B1/00068—Valve switch arrangements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/012—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor characterised by internal passages or accessories therefor
    • A61B1/015—Control of fluid supply or evacuation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/12—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with cooling or rinsing arrangements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
    • A61M39/22—Valves or arrangement of 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
    • F16K27/062—Construction of housing; Use of materials therefor of taps or cocks with conical plugs
    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/02—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having conical surfaces; Packings therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
    • A61M39/22—Valves or arrangement of valves
    • A61M2039/229—Stopcocks

Definitions

  • the present invention relates to a plug valve according to the preamble of claim 1 and to an instrument having a plug valve according to claim 10.
  • Generic plug valves are used on medical instruments to adjust or regulate the flow of flow media such as gas or liquids carried in channels of the instrument , Particular preference is given to using generic chick valves on medical endoscopes or resectoscopes.
  • the flow media are supplied to the medical instrument via inlet and / or outlet lines connected to the instrument and discharged therefrom.
  • Generic chick valves may be provided as valve elements at intermediate points of the supply and / or drain lines away from the medical instrument and / or be connected stationarily as an inlet or outlet point to the instrument.
  • valve plugs For cleaning purposes and for the service or maintenance-related replacement of components generic chick valves are usually formed in several parts and disassembled.
  • at least the valve plug and the valve plug receiving valve housing are provided as separate, completely separable and reusable components.
  • the valve plug is designed to be completely removable from the valve housing for replacement or for cleaning.
  • Various holding mechanisms are known which ensure a secure mechanical hold of the plug in the valve housing in the operating position of the plug valve.
  • a commonly used type of fuse is the screwing of the valve plug with a screwed on the outside of the housing screw.
  • metallic screw components are used to ensure sufficient strength and durability of the screw.
  • the screw is typically formed as a metallic spring unit with a screw thread incorporated therein.
  • a stopcock for flow media leading channels of medical endoscopes in which a conical chuck is pressed via a arranged in the housing of the stopcock spring element in a conical seat.
  • a predetermined breaking point located inside the housing is destroyed by deliberate over-rotation of a stop.
  • an actuating element and arranged underneath the conical plug can be removed from the housing.
  • a chick valve for liquid or gas lines medical endoscopes in which a conical chuck is held in the valve seat by means of a gripping element through an opening of the valve housing in the bottom region of the valve seat holding member.
  • the holding element is designed as a threaded rod which is screwed to the outside of the housing with a screw.
  • Object of the present invention is to provide a plug valve of the type mentioned, which is easier and cheaper to produce.
  • the object is achieved by a plug valve with the features of claim 1.
  • Advantageous embodiments are specified in the dependent claims.
  • a chick valve for controlling a fluid flow in a fluid line of a medical instrument, comprising a housing interspersed by a channel, wherein the channel breaks through a seat surface of a conical seat incorporated in the housing at two mouth points, a conical chuck rotatably mounted in the conical seat a passage, wherein the conical plug is rotatable in an open and a closed position, such that the passage communicates in the open position of the conical plug communicating the two mouth points of the channel and that the channel is blocked in the closed position of the conical bar by a wall of the conical bar , and further comprising a holding member passing through an opening of the housing in the tapered bottom portion of the cone seat, which is detachably connected to a spring unit supported on the housing, and wherein the spring unit grips the chuck on the holding member t is spring biased into the conical seat, and wherein as a releasable connection between the holding element and spring unit, a screw connection is provided, and wherein
  • a threaded thread formed from a thread-wound thread has the particular advantage that the thread-carrying body part of the spring unit and the thread can be formed in two separate assemblies, which are assembled in a common manufacturing step. Without losing the benefits of strength or durability of metallic screw components, the multi-part design increases flexibility in the choice of materials used for the spring unit, retainer, or valve plug.
  • the spring unit according to the invention may be formed from a plastic.
  • alternative manufacturing methods such as an injection molding process can be used, which allow economically viable production of small or specifically form-adapted spring units in large numbers.
  • the thread-wound threaded wire is prepared as a threaded insert, which in its preferably substantially cylindrical shape forms an internal thread for producing a screw connection with the retaining element attached to the conical socket.
  • the threaded insert can be incorporated in an approximately hollow cylindrical receiving hole of the spring unit.
  • the threaded wire is preferably made of a metal, in particular a stainless steel or of a metal alloy.
  • the thread-shaped preformed threaded wire can be screwed into a thread formed in a receiving hole of the spring unit. Since the retaining element is not screwed directly into the material of the spring unit, but in the thread formed by the threaded wire in the spring unit thread, at least the threaded body part of the spring unit may be made of a soft material such as plastic or a soft metal, wherein at the same time secure hold of the screw connection between the holding element and spring unit is made possible. Soft materials can be processed with significantly reduced tool wear, which supports the cost-effective production of the spring unit.
  • the cutting of a thread in a body part of the spring unit for later insertion of the preformed thread wire is much easier and can be performed faster with reduced tool wear. It is preferably intended to form the thread formed by the wound thread in a blind hole of the spring unit. Alternatively, the thread can also be formed in a through hole of the spring unit.
  • the threaded wire in the attachment of the threaded insert by screwing in a thread of a receiving hole of the spring unit can be provided to secure the threaded wire form fit, force and / or cohesively in the receiving hole.
  • it may be provided to glue the threaded wire in the receiving hole.
  • the thread wire at least partially, preferably on its radially outer surfaces surface structures that allow anchoring or clamping a secure fit on the inner wall of the receiving hole or on the surfaces of a machined into the receiving hole thread ,
  • the threaded insert is inserted into the receiving hole, without first preparing a complementary thread in the receiving hole. It is thought that the threaded wire is sufficiently secured against axial or circumferential slipping in the receiving hole for producing a secure screw connection between the holding element and the spring unit. As mentioned, this can be ensured, for example, by gluing, jamming or by rubbing on the material of the spring unit surface structures of the thread wire.
  • the spring unit can be completely or at least partially made of an injection-moldable material, in particular a plastic. When using an injection molding process can be completely dispensed with a subsequent thread cutting even if appropriate threads are required for a later screwing the threaded wire.
  • the threaded thread threads can be formed already in the injection molding process in the threaded body part. This saves an additional manufacturing step and allows a further cost reduction.
  • the wound thread wire in the manufacture of the spring unit or the body part having the threaded encapsulated with injection molding material and thus is firmly connected to the body part of the spring unit. This can ensure a particularly stable hold of the threaded insert or the threaded wire on the spring unit and a reliable screw connection between the holding element and spring unit can be made possible.
  • the body part of the spring unit having the thread is made of a plastic.
  • the entire spring unit is made of a plastic.
  • At least the body part of the spring unit having the thread is produced by injection molding.
  • the thread wire is at least partially formed as a threaded insert, wherein the threaded insert in the injection molding of the body part at least partially provided with that for the preparation of the body part Injection molding material is encapsulated. If the thread-wound threaded wire is already incorporated in the injection molding in a body part of the spring unit, an additional process step of the subsequent insertion of the threaded insert can be saved. Thus, the spring unit or the chick valve is even cheaper to produce.
  • projections and / or recesses or surface structures may be provided on the threaded wire, which are detected by the injection molding material and support the secure hold on the spring unit.
  • Preformed wire thread inserts allow the production of heavy-duty compounds in materials of low strength and are therefore particularly suitable to form durable threads in a spring unit made at least partially plastic.
  • the formation of an external thread by a thread-wound threaded wire is also conceivable.
  • the spring unit comprises a coil spring with which the conical chuck is spring-biased pulled into the conical seat.
  • the spring element designed here as, for example, a helical spring serves to provide a spring force for spring-loaded retention of the conical tongue in the conical seat.
  • the spring element may be formed as a resilient sheet metal or as a plate spring or the like.
  • particularly preferred is the formation of the spring element as a helical spring.
  • Coil springs are characterized by longevity and a well-defined force-travel ratio.
  • the coil spring may be cylindrical or conical.
  • the coil spring is integrally formed with the thread wire, such that the thread wire seamlessly merges from a threaded portion into a spring portion formed by the coil spring. Due to the integral design of the spring portion with the threaded portion of a single continuous thread wire two functions of the spring unit can be realized with a single component at the same time. This leads to further significant cost savings in manufacturing and reduced component complexity of the plug valve.
  • the threaded area of the spring unit is designed to be complementary to the thread of the holding element provided for the screw connection.
  • the threads provided for the screw connection are designed as normalized thread types.
  • the threaded wire as a one-piece manufactured component with a threaded portion and a spring portion may be provided that the inner diameter of the threaded portion is smaller than the inner diameter of the spring portion.
  • This configuration makes it possible for the holding element to protrude, in particular coaxially, into the free inner region of the spring region designed as a helical spring and to be screwed to the narrower threaded region of the threaded wire which adjoins the spring region.
  • particularly space-saving spring units can be provided with small component dimensions.
  • the holding element is formed integrally with the conical chuck.
  • the holding element is designed as a separate component, which is releasably connected on the one hand with the spring unit and on the other hand with the conical chuck.
  • an actuating element rotatably connected to the conical chuck with which the conical chuck is actuated in the open and in the closed position.
  • the actuating element may be a lever connected to the conical chuck via a shaft, which transmits a rotary movement to the conical chuck via a manual actuation.
  • the actuator may be formed as a rotary wheel or the like.
  • the actuator is disposed opposite the tapered bottom portion of the cone throat opposite the conical chuck.
  • Advantages and design variants of the instrument according to the invention also result from the explanations of the conceivable variants of the chick valve.
  • Instruments for gynecological or urological treatment are often equipped with channels in which a liquid and / or a gas is passed to rinse a treatment site.
  • An instrument with a connected chick valve of the type according to the invention has the advantages already explained for the chick valve.
  • the gynecological or the urological instrument is a resectoscope.
  • FIG. 1 shows a schematic sectional view of a plug valve in a conceivable variant.
  • the chick valve 10 shown in Fig. 1 has a housing 12 which is penetrated by a channel 14.
  • the channel 14 breaks through a conical seat 16 in which a conical chuck 18 is rotatably received.
  • an actuating element 26 is connected in a rotationally fixed manner to the conical chuck 18.
  • the conical jaw 18 is rotatably actuated in the conical seat 16 in the open and closed position.
  • the conical plug 18 is penetrated by a passage 20 which, in the illustrated open position, connects two outlet points 22 in the sealing surface of the conical seat 16. In the closed position, the mouth points 22 are not connected to each other, so that the passage of the channel 14 is blocked by the conical plug 18.
  • the channel 14 can be connected to fluid lines and / or a medical instrument (not shown).
  • the housing 12 is perforated with an opening 24 to the outside.
  • the conical plug 18 is sealingly pulled into the conical seat 16 and rotatable there held.
  • an external thread is provided at the free end of the holding element 32, that can be screwed with a threaded portion 38, designed as an internal thread, of the spring unit 28.
  • the spring unit 28 is supported with a spring element designed as a helical spring 30 in the region of the opening edge of the opening 24 on the outside of the housing 12, such that the holding element 32 is acted upon by a tensile force acting in the direction of the longitudinal axis of the conical jaw 18.
  • the spring force provided by the helical spring 30 pulls the conical plug 18 into the conical seat 16.
  • a helical spring 30 instead of a helical spring 30, other types of spring elements can be used which can develop a sufficient tensile force on the holding element 36.
  • the spring unit 28 may comprise a body formed as a spring cup, in which the helical spring 30 is arranged at least partially bordered by a cylindrically shaped outer wall.
  • a threaded wire 36 is incorporated into the material of the spring unit 28.
  • an internal thread is formed by the threaded wire 36, wherein the thread is provided in a coaxially provided on the bottom portion of the spring unit 28 blind hole.
  • the threaded wire 36 is formed profiled to form a screw thread.
  • the spring portion 40 formed by the helical spring 30 is provided above the threaded portion 38 designed as an internal thread, that is to say on the side of the thread facing the valve housing 12, the spring portion 40 formed by the helical spring 30 is provided.
  • the holding member 32 extends in the present case coaxially through the free interior of the helical spring 30 formed here into the spring region 40 subsequent threaded portion 38.
  • the inner diameter of the coil spring 30 in this embodiment is greater than the inner diameter of the threaded portion 38.
  • the holding element 32 is equipped with an external thread.
  • the external thread of the retaining element 32 is designed to be complementary to the threaded region 38 of the spring unit 28 designed as an internal thread.
  • the threaded portion 38 is presently incorporated in a blind hole formed as a spring cup spring unit 28. Alternatively it can be provided to form the threaded portion 38 in a through hole of the spring unit 28.
  • the spring portion 40 and the threaded portion 38 may be formed of a single continuous wire.
  • the threaded wire 36 may be for this purpose following the threaded portion 38 with expanded diameter and axially resilient formed. To produce the spring effect, the free distances between the threads of the coil spring 30 are greater than the free distances of the threads in the threaded portion 38th

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Surgery (AREA)
  • Heart & Thoracic Surgery (AREA)
  • General Engineering & Computer Science (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Biomedical Technology (AREA)
  • Medical Informatics (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Pathology (AREA)
  • Optics & Photonics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Biophysics (AREA)
  • Mechanical Engineering (AREA)
  • Pulmonology (AREA)
  • Anesthesiology (AREA)
  • Hematology (AREA)
  • Endoscopes (AREA)

Abstract

L'invention concerne une vanne à boisseau (10) destinée à commander un écoulement de fluide dans un conduit de fluide d'un instrument médical, comprenant un boîtier (12) traversé par un conduit (14), le conduit (14) traversant, en deux sites d'embouchure (22) dans le boîtier (12), une surface (12) d'un siège conique (16) réalisé dans le boîtier (12) dans le siège conique (16), un boisseau conique (18) monté à rotation dans le siège conique (16) et pourvu d'un passage (20), le boisseau conique (18) pouvant tourner dans une position ouverte et une position fermée de telle sorte que le passage (20) met en communication, dans la position ouverte du boisseau conique (18), les deux sites d'embouchure (22) du conduit (14) et le conduit (14) est bloqué dans la position fermée du boisseau conique (18) par une paroi du boisseau conique (18), et comprenant en outre un élément de retenue (32), qui s'engage à travers un orifice traversant (24) du boîtier (12) dans la partie de fond amincie du siège conique (16) et qui est relié de façon libérable à une unité de ressort (28) en appui sur le boîtier (12), l'unité de ressort (28) tirant le boisseau conique (18) dans le siège conique (16) en étant contrant par ressort sur l'élément de retenue (32), une liaison par vis étant prévue comme liaison amovible entre l'élément de retenue (32) et l'unité de ressort (28) et un filetage, prévu pour la liaison par vis dans la partie corps de l'unité de ressort (28), étant formé à partir d'un fil (36) enroulé en forme de filet.
PCT/EP2016/000483 2015-04-16 2016-03-17 Vanne à boisseau de commande d'un flux de fluide dans un conduit de fluide d'un instrument medical WO2016165806A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015004763.9A DE102015004763A1 (de) 2015-04-16 2015-04-16 Kükenventil zur Steuerung einer Fluidströmung in einer Fluidleitung eines medizinischen Instruments
DE102015004763.9 2015-04-16

Publications (1)

Publication Number Publication Date
WO2016165806A1 true WO2016165806A1 (fr) 2016-10-20

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ID=55640668

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/000483 WO2016165806A1 (fr) 2015-04-16 2016-03-17 Vanne à boisseau de commande d'un flux de fluide dans un conduit de fluide d'un instrument medical

Country Status (2)

Country Link
DE (1) DE102015004763A1 (fr)
WO (1) WO2016165806A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11338079B2 (en) * 2017-07-10 2022-05-24 Karl Storz Se & Co. Kg Medical instrument
JP2022159215A (ja) * 2021-04-01 2022-10-17 オリンパス・ウィンター・アンド・イベ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング シャットオフバルブ、シャットオフバルブ用のコック、及びシャットオフバルブ用のコックを製造する方法
JP7507195B2 (ja) 2021-04-01 2024-06-27 オリンパス・ウィンター・アンド・イベ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング シャットオフバルブ、シャットオフバルブ用のコック、及びシャットオフバルブ用のコックを製造する方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE580129C (de) * 1934-07-11 Heimeier Theodor Absperrvorrichtung
US2262450A (en) * 1939-07-19 1941-11-11 Aireraft Screw Products Compan Self-locking nut
US3945070A (en) * 1975-05-19 1976-03-23 Avia Instrument Company Wire thread cast insert
DE9307601U1 (de) 1993-05-19 1993-07-29 Olympus Winter & Ibe GmbH, 2000 Hamburg Kükenventil für medizinische Endoskope
US20020179878A1 (en) * 2001-05-30 2002-12-05 Olympus Winter & Ibe Gmbh Endoscope stopcock with a detent device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3779513A (en) * 1972-05-18 1973-12-18 American Cystoscope Makers Inc Valve

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE580129C (de) * 1934-07-11 Heimeier Theodor Absperrvorrichtung
US2262450A (en) * 1939-07-19 1941-11-11 Aireraft Screw Products Compan Self-locking nut
US3945070A (en) * 1975-05-19 1976-03-23 Avia Instrument Company Wire thread cast insert
DE9307601U1 (de) 1993-05-19 1993-07-29 Olympus Winter & Ibe GmbH, 2000 Hamburg Kükenventil für medizinische Endoskope
US20020179878A1 (en) * 2001-05-30 2002-12-05 Olympus Winter & Ibe Gmbh Endoscope stopcock with a detent device
DE10126540A1 (de) 2001-05-30 2002-12-19 Winter & Ibe Olympus Endoskopabsperrhahn mit Rasteinrichtung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11338079B2 (en) * 2017-07-10 2022-05-24 Karl Storz Se & Co. Kg Medical instrument
JP2022159215A (ja) * 2021-04-01 2022-10-17 オリンパス・ウィンター・アンド・イベ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング シャットオフバルブ、シャットオフバルブ用のコック、及びシャットオフバルブ用のコックを製造する方法
JP7507195B2 (ja) 2021-04-01 2024-06-27 オリンパス・ウィンター・アンド・イベ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング シャットオフバルブ、シャットオフバルブ用のコック、及びシャットオフバルブ用のコックを製造する方法

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