WO1995014874A1 - Membrane prenant spontanement une position dans une soupape - Google Patents

Membrane prenant spontanement une position dans une soupape Download PDF

Info

Publication number
WO1995014874A1
WO1995014874A1 PCT/AU1994/000724 AU9400724W WO9514874A1 WO 1995014874 A1 WO1995014874 A1 WO 1995014874A1 AU 9400724 W AU9400724 W AU 9400724W WO 9514874 A1 WO9514874 A1 WO 9514874A1
Authority
WO
WIPO (PCT)
Prior art keywords
diaphragm
valve
flexible membrane
cover
valve according
Prior art date
Application number
PCT/AU1994/000724
Other languages
English (en)
Inventor
Andrew John Mccausland
Original Assignee
Goyen Controls Co. Pty. Limited
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 Goyen Controls Co. Pty. Limited filed Critical Goyen Controls Co. Pty. Limited
Priority to AU10592/95A priority Critical patent/AU1059295A/en
Publication of WO1995014874A1 publication Critical patent/WO1995014874A1/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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
    • F16K31/38—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor in which the fluid works directly on both sides of the fluid motor, one side being connected by means of a restricted passage and the motor being actuated by operating a discharge from that side
    • F16K31/385—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor in which the fluid works directly on both sides of the fluid motor, one side being connected by means of a restricted passage and the motor being actuated by operating a discharge from that side the fluid acting on a diaphragm

Definitions

  • This invention relates to valves of the flexible diaphragm type.
  • the invention is particularly suited to valves requiring passage of a large volume of compressed air in a very short cycle such as required in the dust collector filter bag cleaning field, in which a reverse pulse of air is delivered to dislodge collected dust off the surface of a filter bag.
  • valves commonly use a pilot operation principle in which the flexible diaphragm is held in a closed position by pilot pressure and, in the presence of pressure equilibrium on either side of the diaphragm, a metal compression spring exerts a biasing force to ensure that the diaphragm closes the valve seat. That is, the valve is said to be a "normally closed” type.
  • valves that adopt a normally closed status in the absence of a metal compression spring since such metal springs are prone to occasional fatigue failure.
  • Valves according to the present invention require no metal compression spring, due to a self-biasing incorporated in a moulded flexible diaphragm.
  • Most valves of the type traditionally require central reinforcing washers or discs sandwiching a die-cut diaphragm cut from sheet rubber, by the attachment of a bolt and nut, rivet or adhesive.
  • a moulded diaphragm including a reinforced centre which may incorporate an at least partially encapsulated reinforcing disc which, in either form, overcomes disadvantages associated with the known type of diaphragm providing a mass reduction in forms of it without the sandwiching discs.
  • the same US patent discloses a diaphragm cut from sheet resilient material and reinforced by bonding a rigid (e.g. metal) backup washer by an adhesive, unlike the present invention which discloses as preferred means of reinforcement a stiff non-metallic plate at least substantially encapsulated in a flexible membrane moulding to provide an integral diaphragm assembly.
  • the invention consists of a pilot operated diaphragm type valve comprising:
  • a cover enclosing a pilot chamber openable to atmosphere through a port;
  • a body connected to the cover having a valve seat intermediate between an inlet and an outlet;
  • a moulded resilient diaphragm adapted to close the valve seat by contact therewith by a portion of a first face of the diaphragm, a second opposite face of the diaphragm defining the pilot chamber in conjunction with an inside surface of the cover; the diaphragm being clamped at a peripheral marginal edge thereof at a plane of joining of the cover and body, with provision of bleed passage means intercommunicating between both faces of the diaphragm;
  • the diaphragm comprising:
  • a flexible membrane portion intermediate the marginal edge and the seat-engaging portion characterised in that the flexible membrane integrally embodies flexible biasing means adapted to positively deflect the seat-engaging portion to close the valve to fluid flow when said inlet is connected to a source of pressurised fluid and the said pilot port is closed.
  • the integral embodiment of the biasing means in the flexible membrane results in the valve not requiring the provision of a flexible metal compression spring to deflect the diaphragm to positively close the valve seat at conditions of fluid pressure equality on either side of the diaphragm as would be required to achieve a reliably positive bias towards the valve seat in the case of a conventional diaphragm.
  • This provides an advantageous choice because the more widely used compression spring can be a source of failure due to metal fatigue; the usual fairly thin conventional diaphragm may even be subjected to puncture by such a failed spring.
  • the valve of the invention can be identical in its body and cover componentry to one that may use a spring.
  • the flexible membrane of the diaphragm may be partly in contact with an inside surface of the pilot chamber immediately adjacent the peripherally clamped marginal edge, the shaping of the flexible membrane and the contact between it and the valve cover providing at least part of the biasing action required to close the valve seat at pressure equilibrium.
  • one form of flexible biasing means is an annular ridge formed on the face of the flexible membrane that, upon assembly of the valve components, bears upon an inside surface of the pilot chamber so deflecting the diaphragm into contact with the valve seat.
  • An alternative form of flexible biasing.means is an annular convolution moulded into the flexible membrane that likewise (to the ridge) bears upon the inside surface of the pilot chamber.
  • Such an annular convolution may be shaped alternatively such that physical interaction between it and the valve cover is not necessary.
  • a particularly preferred feature is a stiff plate at least partially encapsulated by the material of the membrane to provide a reinforced relatively rigid seat engaging portion.
  • the stiff plate is moulded into the diaphragm to be fully enclosed over the entire face portion of the diaphragm that contacts the valve seat.
  • the plate need not be fully enclosed over the entire face opposite the face that contacts the seat, however it is desirable for mechanical integrity that it be substantially enclosed.
  • a portion of the plate may be left exposed in order to provide a location means to facilitate during its moulding the radial and axial positioning of the plate in the diaphragm relative to the moulded flexible membrane.
  • the location means may be a central boss axially upstanding from the plane of the plate.
  • the distance between the separation plane and the valve seat will be greater or less depending on particular valve performance requirements.
  • the diaphragm is dimensioned in relation to dimensions which in combination determine the respective positions between the seat-contacting face of the diaphragm and the separation plane, namely the thickness of the plate, the nature and shape of the biasing means embodied in the flexible membrane and the dimensional offset between the plane of the first face of the diaphragm at the seat contact location and at the margin location where it is clamped.
  • a relative positioning between the valve seat and separation plane as illustrated is advantageous since the diaphragm can move quickly between closed and fully open with minimal stress in the flexible membrane portion.
  • Such detail dimensioning is within the knowledge of one skilled in the art of design of fluid handling valves of the type.
  • the diaphragm is an assembly encapsulating a stiff plate it is preferred that at least one transverse hole or series of transverse holes be provided in the stiff plate in order to provide a flexible membrane material filled interconnection between the opposite faces of the flexible membrane at least partly encapsulating the stiff plate. This is to further assure the mechanical integrity of the diaphragm assembly in service.
  • the series of holes may take the form of a symmetrically arranged circle of holes (for example, 8), in which case the pitch circle diameter would preferably lie radially away from the alignment with the valve seat.
  • Fig 1 is a cross-sectional elevation of a valve according to the invention.
  • Fig 2 is a cross-sectional elevation of a further embodiment of a valve according to the invention.
  • Fig 3 is a cross-sectional elevation of a further embodiment of a valve according to the invention.
  • Fig 4 is a cross-sectional elevation of a further embodiment of a valve according to the invention.
  • the embodiments of the diaphragm type valve 10 exemplifying the invention as shown in Figs 1 and 4 differ from each other only in respect of a resilient diaphragm assembly 12 which will be more fully described below.
  • valve seat 34 pilot bleed passage in body
  • the cover and body are joined at the separation plane by the bolts, clamping the diaphragm assembly at its peripheral margin.
  • the roll pin is used in conjunction with the bleed passages to align the cover and body upon assembly and the bore of the roll pin when inserted provides part of the bleed passage between the pilot chamber and inlet.
  • the diaphragm is die cut from the flat resilient material, such as sheet rubber and assembled with disc shaped rigid washers sandwiching opposite side of the diaphragm to reinforce the portion that is to contact the valve seat to close the valve.
  • the diameter or maximum linear dimension of the seat-contacting washer is slightly greater than that of the seat.
  • the washers are usually attached to the diaphragm by various means including a rivet, bolt, screw or adhesive.
  • the washers provides the dual function of reinforcing the diaphragm and providing a solid platform for a metal compression spring that bears upon, at one end, the pilot-chamber side washer and at the other, a spring location recess 40.
  • valves of the invention may use a cover identical in all respects with that used in known diaphragm valve types that are provided with a metallic compression spring to bias the diaphragm into a position closing the valve seat.
  • Valves according to the present invention require neither a compression spring nor, as an essential feature, washers as above described.
  • the resilient diaphragm assembly 12 is reinforced preferably with a relatively rigid seat engaging portion comprising a stiff but low mass plate 44 integrally substantially encapsulated by a moulded flexible membrane 46.
  • the plate is separately moulded of preferably a relatively rigid grade of thermoplastic material, such as a filled or rigid unfilled polyolefin, e.g. high density polyethylene or polypropylene.
  • the plate of a plastics material is preferred because of its lower density as compared to a metal plate such as aluminium.
  • a thermosetting plastics may alternatively be chosen as the material for the plate.
  • the flexible membrane is moulded of a rubber or rubber-like material, such as Hytrel tm or another synthetic elastomer having similar properties.
  • the returning action means illustrated in the Fig 1 embodiment of the invention takes the form of an annular ridge 48 and in Figs 2 to 4 the form of an annular convolution 50. In either case the returning action results in the diaphragm assembly closing the valve seat when equal air or other fluid pressure exists on both faces of the diaphragm.
  • annular ridge 48 is located on the side of the membrane 46 that, upon assembly of the valve components, is contained in the pilot chamber 38.
  • the ridge 48 is shaped so that upon assembly it bears against the inside surface of the cover inwardly adjacent the peripherally clamped edge margin of the diaphragm assembly 12. Therefore the ridge 48 and hence the membrane 46 are deflected downwardly to an extent enabling the opposite face of the diaphragm assembly to contact the valve seat 32, so closing the valve to fluid flow.
  • the convolution 50 in the membrane may act in a similar biasing manner to the ridge 48 of Fig 1 insofar as there exists (upon assembly) an interference between the convolution 50 and the inside surface of the cover inwardly of the clamped edge margin of the diaphragm.
  • the combination of the ridge or convolution and its interference with the inside of the cover together with the shape of the diaphragm assembly and the relative location of the separation plane 42 and valve seat 32 enables the valve 10 to adopt a normally closed status when the inlet 22 is connected to a source of pressurised fluid and pilot port 26 is closed.
  • the convolution 50 may be so shaped as not to require interference with the inside of the cover to provide the required biasing or returning action to close the valve (not illustrated).
  • the diaphragm assembly ideally has the stiff plate totally bonded to the encapsulating membrane to better protect the membrane from stress in the repetitive high speed duty for which it is intended. Also, the integrity of the assembly moulding is further augmented by including at least one symmetrically arranged transverse series of holes through the plate which become totally filled by the rubber or rubber-like membrane material. The series of holes be away from the sealing area since any moulding sinks associated with the through holes might otherwise provide a potential leakage location.
  • a further embodiment of the invention shown in Fig 3 may dispense with the encapsulated plate 44 by providing a stiffened central region. 48 in a diaphragm 13
  • the stiffening of the central region is provided merely by thickening the centre to at least three times the thickness of the surrounding flexible membrane 50.
  • a further embodiment of the invention shown in Fig 4 is within the scope of the invention by provision of the convolution 50 even though a central reinforcement assembly 52 sandwiches a flexible membrane 54 which may be moulded with approximately equal thickness at all points.
  • the membrane 54 has a convolution 50 but may have (not illustrated) the ridge alternative as with 48 of Fig 1. All variants provide the springless biasing action.

Landscapes

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

Abstract

Une soupape (10) pilote à membrane est dotée d'une membrane (12) qui prend spontanément une position dans laquelle elle ferme complètement la soupape. Cette membrane présente soit une arête périphérique (48) ou circonvolution (50) dans sa partie flexible située entre son centre rigidifié et son bord marginal où elle est serrée entre un corps (14) et un couvercle (16). Cette membrane peut prendre spontanément une position de manière indépendante, ou bien l'arête ou la circonvolution peuvent revêtir une certaine forme de manière à coopérer avec la surface interne du couvercle. La membrane peut être rigidifiée dans la partie centrale d'engagement du siège par épaississement ou encapsulation d'une plaque en plastique.
PCT/AU1994/000724 1993-11-24 1994-11-24 Membrane prenant spontanement une position dans une soupape WO1995014874A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU10592/95A AU1059295A (en) 1993-11-24 1994-11-24 Self-biasing diaphragm in a valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPM257393 1993-11-24
AUPM2573 1993-11-24

Publications (1)

Publication Number Publication Date
WO1995014874A1 true WO1995014874A1 (fr) 1995-06-01

Family

ID=3777374

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1994/000724 WO1995014874A1 (fr) 1993-11-24 1994-11-24 Membrane prenant spontanement une position dans une soupape

Country Status (2)

Country Link
AU (1) AU1059295A (fr)
WO (1) WO1995014874A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998008150A1 (fr) * 1996-08-21 1998-02-26 Fisher Controls International, Inc. Soupape pour element elastomerique
EP0869286A2 (fr) * 1997-03-07 1998-10-07 MANNESMANN Aktiengesellschaft Distributeur électropneumatique
WO2003052303A1 (fr) * 2001-12-19 2003-06-26 Goyen Controls Co. Pty Limited Systeme de liberation de fluide
WO2008034463A1 (fr) 2006-09-18 2008-03-27 Alberto Lodolo Robinet à servocommande
WO2010075396A2 (fr) * 2008-12-24 2010-07-01 Robertshaw Controls Company Robinet d'eau à commande pilote
CN105020400A (zh) * 2014-04-24 2015-11-04 张未鸣 一种分导活塞式阀门
US9239119B2 (en) 2009-11-09 2016-01-19 Goyen Controls Co. Pty. Ltd. Diaphragm and diaphragm valve
WO2019090461A1 (fr) * 2017-11-07 2019-05-16 Norgren Manufacturing Co., Ltd. Soupape à membrane améliorée
WO2020226557A1 (fr) * 2019-05-09 2020-11-12 Delaval Holding Ab Membrane pour déplacer un disque de soupape d'une soupape de commande, et soupape de commande
US11047501B2 (en) 2017-07-14 2021-06-29 Robertshaw Controls Company Normally open gas valve
US11112025B2 (en) 2017-03-30 2021-09-07 Robertshaw Controls Company Water valve guide tube with integrated weld ring and water valve incorporating same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU3704650A (en) * 1951-09-20 Richard Martindale Barker Improvements in valves
US4244554A (en) * 1979-04-02 1981-01-13 Automatic Switch Company Springless diaphragm valve
AU7864881A (en) * 1980-10-08 1982-06-24 American Standard, Inc. Inshot valve arrangement
US5108067A (en) * 1988-11-03 1992-04-28 Hartwig Straub Diaphragm valve with an elastic diaphragm braced by a valve cover

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU3704650A (en) * 1951-09-20 Richard Martindale Barker Improvements in valves
US4244554A (en) * 1979-04-02 1981-01-13 Automatic Switch Company Springless diaphragm valve
AU7864881A (en) * 1980-10-08 1982-06-24 American Standard, Inc. Inshot valve arrangement
US5108067A (en) * 1988-11-03 1992-04-28 Hartwig Straub Diaphragm valve with an elastic diaphragm braced by a valve cover

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998008150A1 (fr) * 1996-08-21 1998-02-26 Fisher Controls International, Inc. Soupape pour element elastomerique
US5964446A (en) * 1996-08-21 1999-10-12 Fisher Controls International, Inc. Elastomeric element valve
EP1020779A2 (fr) * 1996-08-21 2000-07-19 Fisher Controls International, Inc. Vanne comprenant un élément en élastomère
EP1020779A3 (fr) * 1996-08-21 2000-08-09 Fisher Controls International, Inc. Vanne comprenant un élément en élastomère
EP0869286A2 (fr) * 1997-03-07 1998-10-07 MANNESMANN Aktiengesellschaft Distributeur électropneumatique
EP0869286A3 (fr) * 1997-03-07 2000-03-29 MANNESMANN Aktiengesellschaft Distributeur électropneumatique
WO2003052303A1 (fr) * 2001-12-19 2003-06-26 Goyen Controls Co. Pty Limited Systeme de liberation de fluide
US8316878B2 (en) 2006-09-18 2012-11-27 Alberto Lodolo Servo-operated valve
WO2008034463A1 (fr) 2006-09-18 2008-03-27 Alberto Lodolo Robinet à servocommande
WO2010075396A2 (fr) * 2008-12-24 2010-07-01 Robertshaw Controls Company Robinet d'eau à commande pilote
WO2010075396A3 (fr) * 2008-12-24 2010-10-14 Robertshaw Controls Company Robinet d'eau à commande pilote
US8453992B2 (en) 2008-12-24 2013-06-04 Robertshaw Controls Company Pilot operated water valve
KR101539008B1 (ko) * 2008-12-24 2015-07-23 로버트쇼오콘트롤스컴퍼니 파일럿 작동 수도 밸브
US9239119B2 (en) 2009-11-09 2016-01-19 Goyen Controls Co. Pty. Ltd. Diaphragm and diaphragm valve
TWI548827B (zh) * 2009-11-09 2016-09-11 高元管理股份有限公司 膜片及膜片閥
CN105020400A (zh) * 2014-04-24 2015-11-04 张未鸣 一种分导活塞式阀门
US11112025B2 (en) 2017-03-30 2021-09-07 Robertshaw Controls Company Water valve guide tube with integrated weld ring and water valve incorporating same
US11047501B2 (en) 2017-07-14 2021-06-29 Robertshaw Controls Company Normally open gas valve
WO2019090461A1 (fr) * 2017-11-07 2019-05-16 Norgren Manufacturing Co., Ltd. Soupape à membrane améliorée
WO2020226557A1 (fr) * 2019-05-09 2020-11-12 Delaval Holding Ab Membrane pour déplacer un disque de soupape d'une soupape de commande, et soupape de commande
US11746923B2 (en) 2019-05-09 2023-09-05 Delaval Holding Ab Membrane for a moving a valve disk of a control valve, and a control valve

Also Published As

Publication number Publication date
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