WO2013010546A1 - Élément de vanne coulissante avec moyen de guidage - Google Patents

Élément de vanne coulissante avec moyen de guidage Download PDF

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Publication number
WO2013010546A1
WO2013010546A1 PCT/DK2012/050267 DK2012050267W WO2013010546A1 WO 2013010546 A1 WO2013010546 A1 WO 2013010546A1 DK 2012050267 W DK2012050267 W DK 2012050267W WO 2013010546 A1 WO2013010546 A1 WO 2013010546A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve member
core
valve
spacer element
sliding
Prior art date
Application number
PCT/DK2012/050267
Other languages
English (en)
Inventor
Erling Arnum Freudendahl
Original Assignee
Avk Holding A/S
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 Avk Holding A/S filed Critical Avk Holding A/S
Publication of WO2013010546A1 publication Critical patent/WO2013010546A1/fr

Links

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
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
    • F16K3/0263—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor using particular material or covering 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
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/30—Details
    • F16K3/316—Guiding of the slide

Definitions

  • a sliding valve may be used in pipeline systems for distributing and/or handling fluids such as water, sewages, natural gas, or similar liquid or gaseous media.
  • a sliding valve comprises a housing defining a passage way for the fluid to flow in an axial direction through the housing.
  • the passage way may be closed by sliding a valve member, also referred to as wedge, into the valve opening in a direction transverse to the axial direction.
  • a transverse plane may be defined as the plane of the transverse movement of the valve member.
  • the plane of the sliding movement of the valve member is essentially perpendicular to the axial direction.
  • a sliding movement in a transverse plane that is inclined with respect to the axial direction i.e.
  • the actuation means may comprise a threaded valve stem configured to act upon a valve nut to produce a linear translational movement for sliding the valve member in or out of the passage way in a first transverse direction parallel to the valve stem.
  • the valve nut may be integrated in the valve member.
  • other types of actuation means comprising lever actuators, gear transmissions, rack and pinion drives, hydraulic means, and/or pneumatic means, may also be conceived.
  • the soft sealing material typically is not wear resistant with respect to a sliding motion.
  • typical soft sealing materi- als have a high friction coefficient with respect to most surfaces, in particular if the application of any lubricant is to be avoided for hygienic reasons or for reasons of keeping the level of maintenance to a minimum.
  • This problem may be solved by using slide shoes arranged on the guide members, wherein the slide shoes are preferably made of a wear resistant and corrosion resistant material providing a low friction sliding inter- face with a sliding surface of a cooperating guide rail.
  • EP 0171693 discloses a sliding valve with a valve member comprising guide members that are attached to a valve member core and moulded together with a rubber encapsulation of the valve member.
  • This solution implicitly limits the choice of slide shoe ma- terials to materials that can be vulcanised together with the soft seal material and can withstand the high temperatures occurring when moulding the soft seal material onto the valve core.
  • a further draw-back is that it may be challenging to keep the soft seal material from contaminating the sliding surface of the slide shoe during the moulding process, thus requiring an additional cleaning and polishing step after de-moulding of the encapsulated valve member.
  • EP 0926410 discloses a sliding valve member, wherein a slide shoe is attached onto guide members after the soft sealing encapsulation has been moulded.
  • the problem with this solution is that the slide shoe is supported by a soft layer preventing a precise control over the valve member movement, in particular under large axial pressures on the valve member resulting in an excessive wear of the valve actuation mechanism as well as the sealing surfaces.
  • the valve member core is typically engaged by centring pins in order to centre it in the mould. These centring pins leave openings in the soft seal encapsulation thus requiring a subsequent sealing step for these openings. Merely concealing the openings under a loosely attached slide shoe only insufficiently seals these openings and enhances the risk of corrosion.
  • US 4629160 corresponding to DE 3345133 discloses a valve member for a sliding valve comprising a metal core encapsulated in a rubber elastic material.
  • the metal core is provided with lateral guiding grooves, each having a bottom and two lateral walls.
  • a U-shaped sliding shoe of plastic material is arranged in each guiding groove so that a gap or hollow space is formed between the sliding shoes and the guiding grooves in the metal core.
  • the gap or hollow space is filled with the moulding mass of the rubber elastic jacket encapsulating the metal core.
  • the outer surface of sliding shoes facing the metal core is embedded in the rubber elastic material.
  • the sliding shoes are supported by the soft rubber elastic material preventing a precise control over the valve member movement, especially under large axial pressures on the valve member.
  • valve member for a sliding valve comprising a rubber coated core having lateral uncoated guide projection.
  • Each of the projections is provided with a U-shaped jacket or slide shoe being adhesively connected thereto.
  • the U- shaped jackets or slide shoes are adapted to slide in guide grooves in the housing of the valve.
  • a problem with the above valve member is that it is a major challenge to prevent the rubber forming the rubber coating from contaminating the sliding surfaces of the jackets or slide shoes during the moulding process. As a result an additional cleaning process is required. Disclosure of the invention
  • the object is achieved by a valve member according to claim 1 , wherein advantageous embodiments are recited in the dependent claims referring directly or indirectly to claim 1.
  • the object is achieved by a method of providing a soft seal encapsulated valve member according to claim 1 1 and the dependent claims referring to it.
  • a valve member for a sliding valve comprises a core encapsulated with a soft seal encapsulation and one or more lateral guide members, each guide member being adapted to engage a cooperating guide rail provided inside a housing of the sliding valve so as to take up an axial pressure P exerted on the valve member during operation, wherein the guide members are at least partially covered by a wear-resistant and/or corrosion-resistant slide shoe having a sliding surface adapted for interacting with a corresponding sliding surface of the guide rail, wherein the guide member comprises a prefabricated spacer element of a corrosion-resistant material be- tween the core material and the slide shoe, said prefabricated spacer element being fixedly connected and/or vulcanized together with the soft seal encapsulation of the valve member, so as to be in sealing engagement therewith.
  • suitable soft seal encapsulation materials are rubber materials, such as EPDM rubber or nitrile rubber (NBR).
  • Preferred slide shoe materials comprise plastic materials, such as polyoxymethylene (POM).
  • POM polyoxymethylene
  • a plastic slide shoe glides well on a guide rail surface that is covered with an epoxy coating.
  • corrosion resistant metals such as brass or stainless steel, or ceramic materials may also be used, but require suitable wear-resistant low-friction surfaces on the cooperating guide rails.
  • the spacer can be made from a plastic material that is thermally stable at temperatures of the moulding process. Alternatively, the spacer may also be made of a hard elastomer material or a corrosion resistant metal, such as brass or stainless steel.
  • the spacer element is formed as a clamp with an essentially U-shaped cross-section, wherein the legs of the U-shape are provided with inwardly projecting lugs engaging a mating recess provided on the core.
  • the U-shape provides an advantageous snap-fit clamp, which is easy to attach on projecting ears of the valve member core and facilitates centred mounting of the valve member core in a tool for moulding the soft seal encapsulation.
  • the spacer element may be formed of a plastic material, preferably a thermoplastic material. It should however be noted that the spacer element may also be made of a thermosetting material.
  • the guide members are arranged symmetrically with respect to the central axis and more preferably symmetrical with respect to a mirror plane comprising both the central axis and the axial direction.
  • an axial pressure acting on the valve member under operation is taken up and distributed symmetrically to guiding means on both sides of the valve housing.
  • a sliding valve comprises a valve member according to any of the above-mentioned embodiments. Thereby, the reliability and durability of the valve is increased.
  • a further aspect of the invention relates to a method of producing a soft seal encapsulated sliding valve member comprising one or more guide members, each guide member being adapted to engage a cooperating guide rail provided on the inside of a sliding valve housing so as to take up an axial pressure P exerted on the valve member during operation.
  • the method comprises the steps of
  • the sliding valve member movement is guided by means of guide members provided on lateral portions of the valve member.
  • the guide members cooperate with complementary guide rails arranged lateral of the passage way on the inside of the valve housing to form a sliding bearing.
  • a core of the valve member is made of a material that may be prone to corrosion when exposed to a fluid passing through the valve.
  • the core is protected against corrosion by encapsulating it with a soft sealing material, the sealing material being a thermoplastic or thermosetting material such as rubber.
  • Fig. 2 a top elevational view of the sliding valve of Fig. 1 with the valve bonnet removed
  • Fig. 3 a perspective view of a valve core and a spacer element
  • a sliding valve 1 has a housing 2 defining a passage way 3 for a fluid to flow through the housing 2 in an axial direction A.
  • the housing has flanges 4, 5 for installing the valve in a pipeline system (not shown) for liquid or gaseous media.
  • the housing further comprises a top flange 6 for attaching a valve bonnet 7 holding a valve box 8 through which a stem 9 passes from the outside of the valve 1 to the inside.
  • Rotating the stem 9 around its longitudinal axis actuates a valve member 10 by engaging a valve member nut 1 1 , which is attached to a stem sided portion of the valve member 10, to move in a first transverse direction T1 parallel to the stem 9.
  • the core 13 comprises a main body 14 with a centrally arranged bore 15.
  • the bore 15 is configured to receive a valve stem 9, wherein a longitudinal axis of the bore 15 essentially coincides with the longitudinal axis of the stem 9 extending in a first transverse direction T1.
  • the bore 15 comprises a cavity 16 for holding the valve member nut 1 1.
  • the core 13 further comprises laterally arranged projections 17 for forming the guide members 20.
  • the projections 17 project outwardly in opposite directions parallel to a second transverse direction T2, essentially mirror symmetrically to the first transverse direction T1 in a transverse plane T spanned by the first and second directions T1 , T2.

Landscapes

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

Abstract

L'invention concerne un élément 10 de vanne destiné à une vanne coulissante 1 et comportant un noyau 13 enrobé dans un enrobage tendre 21 d'étanchéité, et un ou plusieurs éléments latéraux 20 de guidage, chaque élément 20 de guidage étant conçu pour interagir avec un rail 12 de guidage coopératif placé à l'intérieur d'un carter 2 de la vanne coulissante 1 de façon à recevoir une pression axiale P exercée sur l'élément de vanne en cours de fonctionnement, les éléments 20 de guidage étant au moins partiellement recouverts d'un sabot coulissant 23 résistant à l'usure et / ou à la corrosion qui présente une surface de glissement conçue pour interagir avec une surface de glissement correspondante du rail 12 de guidage, l'élément 20 de guidage comportant un élément 22 d'entretoise en matériau résistant à la corrosion entre le noyau 13 et le sabot coulissant 23, ledit élément 22 d'entretoise étant vulcanisé conjointement et assurant une étanchéité avec l'enrobage tendre 21 d'étanchéité de l'élément 10 de vanne.
PCT/DK2012/050267 2011-07-15 2012-07-11 Élément de vanne coulissante avec moyen de guidage WO2013010546A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP11174104 2011-07-15
EP11174104.7 2011-07-15

Publications (1)

Publication Number Publication Date
WO2013010546A1 true WO2013010546A1 (fr) 2013-01-24

Family

ID=46507831

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2012/050267 WO2013010546A1 (fr) 2011-07-15 2012-07-11 Élément de vanne coulissante avec moyen de guidage

Country Status (1)

Country Link
WO (1) WO2013010546A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103671989A (zh) * 2013-12-31 2014-03-26 山东莱德机械有限公司 弹性自密封闸阀
EP3096050A1 (fr) * 2015-05-19 2016-11-23 VAG-Armaturen GmbH Élement de blocage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4532957A (en) * 1983-06-24 1985-08-06 United States Pipe And Foundry Company Guides for gate valves
DE3345133A1 (de) 1983-12-14 1985-09-26 Bopp & Reuther Gmbh, 6800 Mannheim Absperrkeil fuer absperrschieber
EP0171693A2 (fr) 1984-08-02 1986-02-19 Bopp & Reuther Aktiengesellschaft Vanne d'arrêt
EP0926410A2 (fr) 1997-12-15 1999-06-30 E. Hawle & Co. Flanschen- und Armaturenwerk Vanne d'arrêt
WO2002008643A2 (fr) * 2000-07-26 2002-01-31 Market Linc Holdings Limited Vannes
DE20119964U1 (de) 2001-12-10 2002-05-29 Awp Gas Und Wasserarmaturen Gm Gleitführung für einen Absperrkeil

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4532957A (en) * 1983-06-24 1985-08-06 United States Pipe And Foundry Company Guides for gate valves
DE3345133A1 (de) 1983-12-14 1985-09-26 Bopp & Reuther Gmbh, 6800 Mannheim Absperrkeil fuer absperrschieber
US4629160A (en) 1983-12-14 1986-12-16 Bopp & Reuther Gmbh Shutoff wedge for shutoff valve
EP0171693A2 (fr) 1984-08-02 1986-02-19 Bopp & Reuther Aktiengesellschaft Vanne d'arrêt
EP0926410A2 (fr) 1997-12-15 1999-06-30 E. Hawle & Co. Flanschen- und Armaturenwerk Vanne d'arrêt
WO2002008643A2 (fr) * 2000-07-26 2002-01-31 Market Linc Holdings Limited Vannes
DE20119964U1 (de) 2001-12-10 2002-05-29 Awp Gas Und Wasserarmaturen Gm Gleitführung für einen Absperrkeil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103671989A (zh) * 2013-12-31 2014-03-26 山东莱德机械有限公司 弹性自密封闸阀
EP3096050A1 (fr) * 2015-05-19 2016-11-23 VAG-Armaturen GmbH Élement de blocage

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