WO2001033120A1 - Améliorations apportées à un clapet à bille - Google Patents

Améliorations apportées à un clapet à bille Download PDF

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Publication number
WO2001033120A1
WO2001033120A1 PCT/EP2000/010754 EP0010754W WO0133120A1 WO 2001033120 A1 WO2001033120 A1 WO 2001033120A1 EP 0010754 W EP0010754 W EP 0010754W WO 0133120 A1 WO0133120 A1 WO 0133120A1
Authority
WO
WIPO (PCT)
Prior art keywords
ball
shutter
valve
ball valve
valve according
Prior art date
Application number
PCT/EP2000/010754
Other languages
English (en)
Inventor
Geo Camponovo
Original Assignee
Cim-Valve Sa
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 Cim-Valve Sa filed Critical Cim-Valve Sa
Priority to AU19977/01A priority Critical patent/AU1997701A/en
Publication of WO2001033120A1 publication Critical patent/WO2001033120A1/fr

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Classifications

    • 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
    • F16K5/06—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 spherical surfaces; Packings therefor
    • F16K5/0605—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 spherical surfaces; Packings therefor with particular plug arrangements, e.g. particular shape or built-in 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
    • 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
    • F16K5/08—Details
    • F16K5/12—Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve

Definitions

  • the present invention relates to an improved ball valve according to the preamble of claim 1.
  • ball valves conventionally comprising a shutter element of ball form, which can be either hollow or solid and provided with a diametrical throughgoing hole having circular inlet and outlet ports are already known.
  • the ball shutter is so supported as to be able of turning through 90° between two supporting and sealing gaskets, made of a synthetic material and housed in corresponding seats of the valve body. The reciprocating 90° rotary movement allows to pass from the closure or on position to the maximum opening or off position and vice-versa.
  • a first prior solution adopted by the Swiss Company Belimo Automation AG of Wetzikon, provides to arrange, upstream of the ball, in the flow direction, and in front of the ball supporting and sealing gasket, an adjusting diaphragm or
  • CONFIRMATION COP disc having a contoured opening laterally defined by two lobes and having a substantially triangular shape or V-shape, said diaphragm being supported by a resilient ring element, and being made of a synthetic material.
  • the diaphragm inner surface contacting the ball shutter is also spherical and both diaphragm lobes forming the V-shaped opening are rather tiiin.
  • said V-shape is a consequence of the known relationship of the small-step rotation of the ball shutter, obtained by known electric actuators or motors, and the corresponding throughgoing apertures of the shutter.
  • contoured seat diaphragm and its locating resilient ring represent additional components of the valve.
  • the lobes of said contoured diaphragm are operatively subjected to a unidirectional pressure stress toward the ball, due to the inlet fluid flow pressure.
  • said diaphragm would be also subjected to the thermal stress due to the hot water, for example at a temperature of 70-80°C, thereby the cumulative effect of the mentioned pressure and thermal stresses on said contoured diaphragm could push said diaphragm, either toward the ball or the inside of the ball shutter throughgoing hole, which could make the rotary movement of the ball shutter "harder", or hinder or completely prevent said movement and lock the shutter.
  • a further prior solution provides to form the ball shutter supporting and sealing gasket on the outlet side, with a contoured port or opening and to make it of a synthetic material, a glass fiber reinforced synthetic material, or a metal material.
  • the contoured-port gasket or supporting seat would not have the drawbacks of the Belimo's valve, but would requires, from one side, to use more expensive gaskets or seats (for example glass fiber reinforced synthetic material seats, or sinterized and graphite impregnated steel seats) and, on the other side, a ball coated by Polyond TM ? the ball surface, to provide a "super-spherical" shutter, being moreover coated by polyethylene terephtalate (PTFE) and nickel solutions, which would require additional machining steps susceptible to increase the valve cost.
  • PTFE polyethylene terephtalate
  • the object of the present invention is to provide an improved ball valve suitable for adjusting applications in general, and particularly for the thermal adjustment in heating plants, which ball valve is free of the mentioned drawbacks and disadvantages of the prior art valves, and which does not require additional components or special materials or gaskets.
  • a further aspect is that to provide a ball shutter profiled or contoured bifunctional opening, i.e. suitable to allow the valves according to the invention to be used both as thermal adjusting valves and as balancing valves. This would also involve a simplification of the storing requirements.
  • the ball shutter does not require additional components and can be made as a single-piece.
  • the improved ball valve is adapted to provide a percentage adjustment characteristic curve and is suitable to be used as a thermal adjusting valve in heating plants.
  • the improved ball valve having a "saddle"-shaped opening is suitable to be used both as a thermal adjusting valve and as a balancing valve in heating plants.
  • said ball shutter can be made by conventional making methods and machining operations, or machine tools.
  • Claim 8 teaches how to obtain the desired contoured opening.
  • the contoured ports or openings are provided as plug inserts which can be respectively engaged in the ball shutter throughgoing hole or in the valve body adjoining a housing seat or recess for an annular gasket. This approach will allow to transform prior conventional ball valve for an on/off operation into ball valves the flow rate of which can be adjusted in percentage.
  • the inventive valve is coupled to a known rotatively driving device, which is suitable either for a manual and/or for an automatic drive.
  • Claim 11 relates to a specifically designed ball shutter suitable to transform a ball valve from an on/off valve into an adjusting valve, by simply replacing the ball shutter of the valve.
  • Claim 12 discloses a solution making the inventive valve suitable for use in condominial heating systems.
  • the ball valve and ball shutter according to the invention provide several and important advantages.
  • the ball valves can be either used exclusively as thermal adjusting valves, by providing a V- shaped opening, or as valves suitable to be used, at will, as thermal adjusting valves or balancing valves, with a "saddle"-shaped opening, in both cases with a good yield.
  • thermal adjusting valves or balancing valves with a "saddle"-shaped opening, in both cases with a good yield.
  • prior art balancing valves the flow-rate variation trend due to the particles depositing in the throughgoing opening is substantially reduced.
  • the shutter diameter being the same, the ball shutter provides a port larger than of prior art axial shutter, the length of the ball valves is much smaller, which, together with the greater constructional simplicity of the ball valves, would involve reduced manufacturing costs.
  • the modification of the ball shutter, or of the valve body, according to the invention, with respect to conventional ball shutters or valve bodies, can be practically made at a very low cost, since the proposed improvement can be mainly performed in the same making step of prior ball shutters or valve bodies, for example by using a molding punch having for example an operating contoured or shaped end portion, and by known chip removal machining operations, which can be carried out on conventional machine tools, or with a laser working. Accordingly, the general making time and cost remain substantially unchanged.
  • the ball shutter according to the invention does not require specifically designed finishing operations and, for supporting it, conventional gaskets can be used, the valve body remaining unchanged.
  • valve can be indifferently used as an on/off drive valve or as an adjusting valve, and more particularly as a thermal adjusting valve or as a balancing valve.
  • known rotary driving devices either of a manual or of an automatic type, for example gear transmission handwheels, or driving assemblies or units including either electric or pneumatic motors or actuators and the related control electronics, to be optionally coupled to a control computer.
  • the GB Patent No. 1 550 119 discloses an improved plug valve with a parallel and taper plug or a spherical plug which has a non-circular throughgoing hole extending through the whole thickness of the shutter, and more specifically, symmetrically with respect to a middle vertical plane, that is the rotary axis of the shutter. This would involve, on the one hand, a rather complex machining and, on the other hand, contoured gaskets. Similar valves can not be used as thermal adjusting valves or as balancing valves in heating plants.
  • the document EP 0 503 195 Bl discloses a ball valve having improved adjusting characteristics provided by a gasket provided with different contoured openings, for example in the form of a circle sector, a slot or with a plurality of small holes.
  • a gasket provided with different contoured openings, for example in the form of a circle sector, a slot or with a plurality of small holes.
  • contoured openings is not possible to employ the suggested valves as thermal adjusting valves or balancing valves.
  • a special gasket instead of a standard one would be necessary.
  • plug valves including a gasket having a troughgoing opening in the form of a circular sector having an horizontal axis. Accordingly, also this valve would require a specifically designed gasket which, in turn, requires a special locking thereof and, indirectly, a special design of the whole valve.
  • Figures 1 to 4 show a first embodiment of an improved ball valve according to the invention, partially in view and partially cross-sectioned, the supporting gaskets and ball shutter being shown in perspective, said shutter being respectively shown in its closure or on position in figure 1, in its 30% opened position in figure 2, in its 70% opened position in figure 3 and in its 100% opened or off position in figure 4;
  • Figures 5 to 8 show a second embodiment of the improved ball valve according to the invention, partially in view and partially cross-sectioned, the gaskets and ball shutter being shown in perspective, said shutter being respectively shown in its closure or on position in figure 5, in its 30% opening position in figures 6, in its 70% opening position in figure 7, and in its 100% opening or off position in figure 8, likewise to the corresponding figures 1 to 4 of the first embodiment;
  • Figures 9 to 12 show a third embodiment of an improved ball shutter of a ball valve according to the present invention, said shutter being respectively shown in a front view in figure 9, in a frontal perspective view in figure 10, in a perspective back view in figure 11, and in a vertical sectional view taken according the sectional plane XII-XII of figure 9 in figure 12; and
  • Figures 13 to 15 show a fourth embodiment of an improved ball shutter of a ball valve according to the present invention, said shutter being respectively shown in a front view in figure 13, in a perspective back view in figure 14, and in a vertical sectional view taken according to the sectional plane XV-XV of figure 13 in figure 15.
  • the reference number 1 generally indicates a ball valve.
  • Said ball valve comprises, in a per se known manner, a valve body 2, provided with an inlet fitting 3 and outlet fitting 4, therebetween an housing chamber 6 for housing a conventional ball shutter 7 is provided, that is formed by a ball having a cylindrical throughgoing hole 12, as shown and indicated in figures 5 to 8.
  • the shutter 7 is supported by two sealing opposite gaskets 8 made of a synthetic material.
  • the reference number 9 indicates a stem which is rotatably and sealingly supported in the valve body 2 and is engaged, on a side, in the ball shutter and, on the other side, in a rotary control element 11.
  • the latter can comprise, at will, a handwheel, knob, lever or the like (for a manually operated rotary drive), or a control or drive unit including an electric motor or, depending on the application, a pneumatic motor, or actuator provided with a suitable control portion (for an automatic rotary drive or control).
  • the known ball shutter is provided with a diametrically throughgoing hole 12, the inlet port 13 and outlet port 14 of which have a circular shape and a uniform throughgoing diameter, as shown in figure 5.
  • a prior exemplary ball valve allows, by a 90° rotation of the ball shutter 7, a perfect opening/closing drive, however with flow-rates which are not proportional, in percentage, to the rotary angles of the driving or control element 11, as required, on the contrary, for example in adjusting valves for the adjusting of the temperature in a heating plant branched on several floors of a building multi-floor heating plant.
  • the invention intervenes, according to which one of the ports 13, 14 of the throughgoing hole 12 of the improved shutter 7 departs from the circular configuration and is provided with a throughgoing hole 12 having an end wall 7B in which is provided a contoured port or opening 16 which for a temperature adjusting valve will present a shape similar to the known V-shape or lobed shape, as shown in figures 9 to 12 having the lobes 7 A, that is suitable to allow an adjustment, in percentage, of the flow-rate, proportionately to the rotary angle of the stem 9, or of the control or drive element 11 thereof.
  • the contoured pattern or opening 16 formed in the thin end wall 7B of the ball shutter 7 may have the known lobed shape as shown in figures 9 to 12 (for achieving a percentage characteristic curve, that is for a thermal adjustment in heating plants) or, according to a further embodiment of the present invention, a different form, for example a substantially triangular shape with rounded sides (fig. 1 to 8) or as illustrated in figures 13 to 15 which show an important embodiment having a "bicycle saddle” shape. Said "saddle" shape is very important because with such a contoured opening it is possible to achieve good results both in the use of the improved ball valve as a temperature adjusting valve as well as in the use as a balancing valve for heating plants.
  • the contoured opening 16 is directly formed through an end wall 7B of the shutter 7, i.e. by using the material of said shutter itself, and no deformable part or component is provided, the contoured opening 16 could be indifferently provided at the inlet port 13 or at the outlet port 14 of the shutter 7.
  • the provision of the contoured pattern at the inlet port, i.e. at the inlet fitting 3 of the valve 1, would advantageously allow to safely prevent any turbulences from forming in the flow inside the valve.
  • the contoured pattern 16 is advantageously formed during the conventional making of the ball shutter 7, for example by molding, in particular hot molding for a brass shutter, in which operation the front end portion of the throughgoing hole forming punch could be shaped correspondingly to the desired contoured throughgoing port 16, thereby making, at the end portion of the operating stroke thereof, said contoured opening or port 16 through the ball or the end wall 7B.
  • the following chip machining finishing operation will be likewise carried out, and by conventional automatic tool machines.
  • the ball shutter 7 according to the invention can be also made by casting.
  • the contoured opening 16 in the shutter end wall 7B could also be obtained by laser working whereas the cylindrical hole 12 may be obtained in any known manner.
  • the rotary movement of the shutter 7 from the closing position (figure 1) to the maximum opening position (figure 4) and vice-versa will provide ⁇ with a triangular or lobed opening 16, figures 1 to 12 — a variable flow-rate proportional, in percentage, to the rotary movement of the control or drive element 11, or of the stem 9 whereas with a "saddle"-shaped opening 16, figures 13 to 15 the valve will provide a variable flow-rate which represents a good compromise for the use both as a thermal adjusting valve and a balancing valve.
  • This "saddle"-shaped opening 16 will, therefore, allow a great broadening of the ball valve application fields, such as in heating, ventilating and air conditioning system applications.
  • the known balancing valves can be substituted in general with an adjusting valve with a shutter having a "saddle"-shaped opening 16, the contour of which has been determined according to the present invention for the above illustrated double use.
  • the seat 16 is formed in the ball valve body 2 at the inlet or outlet fitting 3, respectively 4, and, more specifically on a front inner partition wall 18, on the ball shutter 7 side.
  • the contoured seat 16 has the longitudinal axis 16a thereof arranged on a middle horizontal plane of the ball valve 1, or of the ball shutter 7, in the assembled position thereof. From figures 5 to 8 it is moreover possible to see that the opening 16 increases in the turning direction of the ball shutter 7 from its closing position to its opening position.
  • the contoured seat 16 is formed during the conventional macMning steps, i.e., at first by using the same molding punch and then by performing the following chip removal machining operations, or by a laser working.
  • the shutter 7 of this second embodiment is shown as having a traditional throughgoing hole 12 of constant diameter. As in the first embodiment, the adjustment would be substantially the same, even if a known hollow-ball shutter would be used.
  • contoured ports 16 in metal plug elements, not specifically shown, as it would be immediately apparent to one skilled in the art, to be engaged in the ball shutter or in the valve body, to transform on/off ball valves into adjusting ball valves.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Taps Or Cocks (AREA)

Abstract

Ce clapet à bille (1) comporte un volet (7) monté rotatif et étanche dans le corps de clapet (2) dans lequel, dans un composant du clapet à bille formé par le volet (7) ou le corps (2) de clapet (1), est ménagée une ouverture en courbe (16) pouvant avoir différents contours. Si le contour est lobé, le clapet fait office de clapet de réglage de température tandis que si l'ouverture a la forme d'une « selle », on peut utiliser le clapet aussi bien en tant que clapet de réglage de température qu'en tant que clapet d'équilibrage dans des installations de chauffage.
PCT/EP2000/010754 1999-11-02 2000-10-31 Améliorations apportées à un clapet à bille WO2001033120A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU19977/01A AU1997701A (en) 1999-11-02 2000-10-31 Improved ball valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH19992003/99 1999-11-02
CH200399 1999-11-02

Publications (1)

Publication Number Publication Date
WO2001033120A1 true WO2001033120A1 (fr) 2001-05-10

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WO (1) WO2001033120A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1439339A1 (fr) * 2003-01-14 2004-07-21 Fratelli Pettinaroli S.P.A Robinet à boisseau sphérique
EP1528303A1 (fr) * 2003-10-31 2005-05-04 Siral S.p.A. Vanne à boisseau sphérique de régulation et de mélange de débit
WO2007118666A1 (fr) * 2006-04-13 2007-10-25 Vir Valvoindustria Ing. Rizzio - S.P.A. Billes pour soupapes et procédé de production
DE102010008740A1 (de) * 2010-02-20 2011-08-25 Audi Ag, 85057 Ventilanordnung zur Durchflusssteuerung in einem Fluidkreislauf
WO2011144195A1 (fr) * 2010-05-20 2011-11-24 Porep Gmbh Vanne à tiroir rotatif destinée à mélanger un carburant à faible viscosité avec un carburant très visqueux
CN103742669A (zh) * 2014-01-15 2014-04-23 浙江欧意阀门有限公司 球阀的球芯
CH708205A1 (de) * 2013-06-12 2014-12-15 Belimo Holding Ag Regelhahn.
CN104455525A (zh) * 2014-11-14 2015-03-25 浙江中控流体技术有限公司 流量可调节球阀
CN104685275A (zh) * 2012-07-11 2015-06-03 伊利诺斯工具制品有限公司 恒温阀
WO2016011556A1 (fr) 2014-07-23 2016-01-28 George Kim Surfaces composites protectrices
DE102015120163A1 (de) * 2015-11-20 2017-05-24 Choren Industrietechnik GmbH Kugelhahn für die Drosselung eines Medienstromes
IT201800003489A1 (it) * 2018-03-13 2019-09-13 Effebi Spa Guarnizione per una valvola a sfera e gruppo otturatore sferico comprendente la guarnizione
CN111623134A (zh) * 2019-02-27 2020-09-04 巨全金属工业股份有限公司 阀球结构及其球阀开关

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1151661A (en) * 1966-11-28 1969-05-14 Honeywell Inc Improvements in or relating to Fluid Valves
GB1550119A (en) 1976-04-06 1979-08-08 Worcester Controls Ag Plug valve
EP0085565A1 (fr) 1982-02-01 1983-08-10 Worcester Controls Corporation Robinet d'arrêt
EP0309678A1 (fr) * 1987-09-02 1989-04-05 Deutsche Babcock Werke Aktiengesellschaft Procédé de fabrication d'un boisseau sphérique pour un robinet à boisseau
DE4115101A1 (de) * 1991-05-08 1992-11-12 Total Feuerschutz Gmbh Dosierventil fuer schaummittel
EP0503195B1 (fr) 1991-03-11 1996-05-22 Worcester Controls Corporation Boisseau sphérique avec des capacités améliorées de régulation
US5551467A (en) * 1995-08-11 1996-09-03 H-Tech, Inc. Ball valve with controlled flow variation

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1151661A (en) * 1966-11-28 1969-05-14 Honeywell Inc Improvements in or relating to Fluid Valves
GB1550119A (en) 1976-04-06 1979-08-08 Worcester Controls Ag Plug valve
EP0085565A1 (fr) 1982-02-01 1983-08-10 Worcester Controls Corporation Robinet d'arrêt
EP0309678A1 (fr) * 1987-09-02 1989-04-05 Deutsche Babcock Werke Aktiengesellschaft Procédé de fabrication d'un boisseau sphérique pour un robinet à boisseau
EP0503195B1 (fr) 1991-03-11 1996-05-22 Worcester Controls Corporation Boisseau sphérique avec des capacités améliorées de régulation
DE4115101A1 (de) * 1991-05-08 1992-11-12 Total Feuerschutz Gmbh Dosierventil fuer schaummittel
US5551467A (en) * 1995-08-11 1996-09-03 H-Tech, Inc. Ball valve with controlled flow variation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"METAL CHARACTERISED SEATS INCREASE RANGEABILITY FOR PRECISION THROTTLING CONTROL VALVES", DESIGN ENGINEERING,GB,MORGAN-GRAMPIAN LTD. LONDON, 1 June 1989 (1989-06-01), pages 27, XP000032833, ISSN: 0308-8448 *

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1439339A1 (fr) * 2003-01-14 2004-07-21 Fratelli Pettinaroli S.P.A Robinet à boisseau sphérique
EP1528303A1 (fr) * 2003-10-31 2005-05-04 Siral S.p.A. Vanne à boisseau sphérique de régulation et de mélange de débit
WO2007118666A1 (fr) * 2006-04-13 2007-10-25 Vir Valvoindustria Ing. Rizzio - S.P.A. Billes pour soupapes et procédé de production
US8166994B2 (en) 2006-04-13 2012-05-01 Vir Valvoindustria Ing. Rizzio—S.p.A. Ball for valves and production method
DE102010008740B4 (de) * 2010-02-20 2017-03-02 Audi Ag Ventilanordnung zur Durchflusssteuerung in einem Fluidkreislauf
DE102010008740A1 (de) * 2010-02-20 2011-08-25 Audi Ag, 85057 Ventilanordnung zur Durchflusssteuerung in einem Fluidkreislauf
WO2011144195A1 (fr) * 2010-05-20 2011-11-24 Porep Gmbh Vanne à tiroir rotatif destinée à mélanger un carburant à faible viscosité avec un carburant très visqueux
CN104685275A (zh) * 2012-07-11 2015-06-03 伊利诺斯工具制品有限公司 恒温阀
US9951878B2 (en) 2012-07-11 2018-04-24 Illinois Tool Works Inc. Thermostat valve
CH708205A1 (de) * 2013-06-12 2014-12-15 Belimo Holding Ag Regelhahn.
WO2014198367A1 (fr) * 2013-06-12 2014-12-18 Belimo Holding Ag Robinet de régulation
US9903481B2 (en) 2013-06-12 2018-02-27 Belimo Holding Ag Control valve
CN103742669A (zh) * 2014-01-15 2014-04-23 浙江欧意阀门有限公司 球阀的球芯
WO2016011556A1 (fr) 2014-07-23 2016-01-28 George Kim Surfaces composites protectrices
CN104455525A (zh) * 2014-11-14 2015-03-25 浙江中控流体技术有限公司 流量可调节球阀
DE102015120163A1 (de) * 2015-11-20 2017-05-24 Choren Industrietechnik GmbH Kugelhahn für die Drosselung eines Medienstromes
IT201800003489A1 (it) * 2018-03-13 2019-09-13 Effebi Spa Guarnizione per una valvola a sfera e gruppo otturatore sferico comprendente la guarnizione
EP3540278A1 (fr) * 2018-03-13 2019-09-18 Effebi S.p.A. Joint d'étanchéité pour soupape à bille et ensemble d'obturateur à bille comprenant le joint d'étanchéité
CN111623134A (zh) * 2019-02-27 2020-09-04 巨全金属工业股份有限公司 阀球结构及其球阀开关

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