WO1992009835A1 - Diaphragm valve - Google Patents

Diaphragm valve Download PDF

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Publication number
WO1992009835A1
WO1992009835A1 PCT/GB1991/001973 GB9101973W WO9209835A1 WO 1992009835 A1 WO1992009835 A1 WO 1992009835A1 GB 9101973 W GB9101973 W GB 9101973W WO 9209835 A1 WO9209835 A1 WO 9209835A1
Authority
WO
WIPO (PCT)
Prior art keywords
diaphragm
valve
valve body
bonnet
relatively thin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB1991/001973
Other languages
French (fr)
Inventor
Robert Reginald Raikes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Crane Process Flow Technologies Ltd
Original Assignee
Saunders Valve Co Ltd
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 Saunders Valve Co Ltd filed Critical Saunders Valve Co Ltd
Publication of WO1992009835A1 publication Critical patent/WO1992009835A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F16K41/00—Spindle sealings
    • F16K41/10—Spindle sealings with diaphragm, e.g. shaped as bellows or tube
    • F16K41/103—Spindle sealings with diaphragm, e.g. shaped as bellows or tube the diaphragm and the closure member being integrated in one member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
    • F16K7/12—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm
    • F16K7/126—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm the seat being formed on a rib perpendicular to the fluid line

Definitions

  • This invention relates to a diaphragm valve, that is to say a valve in which a closure diaphragm is secured to a valve body and is movable by an operating mechanism into engagement with a seat defined by the valve body in order to close the valve to fluid flow.
  • the diaphragm of a diaphragm valve has a peripheral zone of substantially uniform thickness which is compressed between the valve body and a bonnet assembly which is itself secured to the valve body by suitable means, for example fastening bolts.
  • suitable means for example fastening bolts.
  • the presence of the diaphragm between the body and the bonnet means that the body retaining fasteners cannot be tightened hard down. They should, ideally, be set to a specified torque, but accurate setting of the torque is not always carried out, especially when valve diaphragms are changed by service personnel not familiar with the torque requirements of the particular valve and diaphragm in question.
  • a diaphragm valve comprising: a valve body defining a diaphragm opening and a valve seat; a valve bonnet secured to the valve body; a diaphragm closing the diaphragm opening, the peripheral zone of the diaphragm being compressed between the valve body and the valve bonnet to maintain the diaphragm in sealing engagement with the valve body around the diaphragm opening; and an operating mechanism for moving the diaphragm into sealing engagement with the valve seat to close the valve to fluid flow and away from the valve seat to open the valve to fluid flow, wherein the peripheral zone of the diaphragm comprises a relatively thick radially inner portion and a relatively thin radially outer portion both of which are compressed between the valve body and the valve bonnet, at least one of the valve body and the valve bonnet being stepped to accommodate the changes in thickness of the diaphragm.
  • diaphragm valve With an embodiment of diaphragm valve according to the present invention only the relatively thin radially outer portion of the diaphragm is visible between the valve body and the bonnet, and because this portion can be made very thin the problems of aesthetic appearance and confidence referred to above are obviated. Further, if the tolerances of the various components are carefully controlled the fastenings which secure the valve bonnet to the valve body may be tightened hard to compress the relatively thin radially outer portion of the diaphragm, and when the fastenings are fully tightened in this manner the radially inner relatively thick portion of the diaphragm will be correctly compressed for proper working of the valve.
  • the relatively thin radially outer portion of the diaphragm comprises a relatively thin web of elastomeric material which is moulded with one or more raised beads to form a sealing bead in the region of the relatively thin portion of the diaphragm.
  • a sealing bead provides an effective secondary seal against leakage of line fluid between the valve bonnet and the body.
  • Figure 1 shows, in axial cross-section, a preferred embodiment of the invention
  • Figure 2 is a top plan view of the valve of Figure 1 ;
  • Figures 3 and 4 are respectively a top plan view and a bottom plan view of a diaphragm for use in the valve of Figure 1 ;
  • Figure 5 is a side view of the diaphragm of Figures 3 and 4;
  • Figure 6 is a cross-section on the line A-A of Figure 3.
  • Figure 7 is a cross-section on the line B-B of Figure 3.
  • the diaphragm valve 1 comprises a valve body 2 having a flow passage 3 and a diaphragm opening 4.
  • a valve bonnet 5 is secured to the valve body by means of threaded fasteners 6.
  • the peripheral zone 10 of a diaphragm 7 is compressed between the valve body 2 and the valve bonnet 5 to maintain the diaphragm in sealing engagement with the valve body around the diaphragm opening 4.
  • An operating mechanism 8 is provided for moving the diaphragm into sealing contact with a valve seat 9 provided on the valve body to close the valve to fluid flow.
  • the diaphragm 7 is a rubber moulding which may optionally incorporate reinforcing fabric.
  • the diaphragm may be of a composite nature, having for example a PTFE facing and an elastomeric rubber backing.
  • the peripheral zone 10 of the diaphragm which, in use, is compressed between the valve body and the valve bonnet comprises a relatively thick radially inner region 11 and a relatively thin radially outer region 12.
  • the thickness of the radially inner region 11 substantially corresponds to the thickness of the diaphragm over the regions thereof which flex in use.
  • Both the upper and lower faces of the relatively thin radially outer region 12 are formed with raised beads 13 having the form shown in the drawings. Each raised bead on the upper surface overlies a raised bead formed on the lower surface with the result that the raised beads together form thickened regions of the relatively thin radially outer portion similar in nature to 0-ring seals.
  • the lower face of the bonnet 5 is formed with a step 14 to accommodate the change of thickness of the diaphragm.
  • the operating mechanism 8 is of the rising handwheel type - that is to say as the handwheel is rotated to move the diaphragm from its closed position in engagement with the seat 9 towards it fully open position, the handwheel itself moves away from the body to expose progressively more of an indicator sleeve 15 provided for the purpose of giving a visual indication that the valve is open.
  • the fasteners 6 may be tightened fully home to compress the relatively thin radially outer portion 12 of the diaphragm between the bonnet 5 and the valve body 2. If the fasteners 6 are fully tightened the size of the step 14 is such that the relatively thick radially inner portion of the diaphragm will be correctly compressed between the valve body 2 and the bonnet 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lift Valve (AREA)
  • Navigation (AREA)
  • Traffic Control Systems (AREA)
  • Diaphragms And Bellows (AREA)

Abstract

A diaphragm valve (1) comprises a valve body (2) defining a diaphragm opening (4) and a valve seat (9); a valve bonnet (5) secured to the valve body; a diaphragm (7) closing the diaphragm opening, the peripheral zone (10) of the diaphragm being compressed between the valve body and the valve bonnet to maintain the diaphragm in sealing engagement with the valve body around the diaphragm opening; and an operating mechanism (8) for moving the diaphragm into sealing engagement with the valve seat to close the valve to fluid flow and away from the valve seat to open the valve to fluid flow. The peripheral zone of the diaphragm comprises a relatively thick radially inner portion (11) and a relatively thin radially outer portion (12) both of which are compressed between the valve body and the valve bonnet, at least one of the valve body and the valve bonnet being stepped to accommodate the changes in thickness of the diaphragm.

Description

DIAPHRAGM VALVE
This invention relates to a diaphragm valve, that is to say a valve in which a closure diaphragm is secured to a valve body and is movable by an operating mechanism into engagement with a seat defined by the valve body in order to close the valve to fluid flow.
Conventionally, the diaphragm of a diaphragm valve has a peripheral zone of substantially uniform thickness which is compressed between the valve body and a bonnet assembly which is itself secured to the valve body by suitable means, for example fastening bolts. With such an arrangement, the periphery of the diaphragm is visible between the body and the bonnet, and whilst this can be useful, for example in identifying the grade of elastomer from which the diaphragm is made, the fact that the diaphragm is visible is aesthetically not pleasing and can give rise to misgivings as to the capability of the diaphragm to form a reliable seal under all conditions. Further, because of the elastomeric nature of the diaphragm the presence of the diaphragm between the body and the bonnet means that the body retaining fasteners cannot be tightened hard down. They should, ideally, be set to a specified torque, but accurate setting of the torque is not always carried out, especially when valve diaphragms are changed by service personnel not familiar with the torque requirements of the particular valve and diaphragm in question.
According to one aspect of the present invention there is provided a diaphragm valve comprising: a valve body defining a diaphragm opening and a valve seat; a valve bonnet secured to the valve body; a diaphragm closing the diaphragm opening, the peripheral zone of the diaphragm being compressed between the valve body and the valve bonnet to maintain the diaphragm in sealing engagement with the valve body around the diaphragm opening; and an operating mechanism for moving the diaphragm into sealing engagement with the valve seat to close the valve to fluid flow and away from the valve seat to open the valve to fluid flow, wherein the peripheral zone of the diaphragm comprises a relatively thick radially inner portion and a relatively thin radially outer portion both of which are compressed between the valve body and the valve bonnet, at least one of the valve body and the valve bonnet being stepped to accommodate the changes in thickness of the diaphragm.
With an embodiment of diaphragm valve according to the present invention only the relatively thin radially outer portion of the diaphragm is visible between the valve body and the bonnet, and because this portion can be made very thin the problems of aesthetic appearance and confidence referred to above are obviated. Further, if the tolerances of the various components are carefully controlled the fastenings which secure the valve bonnet to the valve body may be tightened hard to compress the relatively thin radially outer portion of the diaphragm, and when the fastenings are fully tightened in this manner the radially inner relatively thick portion of the diaphragm will be correctly compressed for proper working of the valve.
In a particularly preferred embodiment of the invention the relatively thin radially outer portion of the diaphragm comprises a relatively thin web of elastomeric material which is moulded with one or more raised beads to form a sealing bead in the region of the relatively thin portion of the diaphragm. Such a sealing bead provides an effective secondary seal against leakage of line fluid between the valve bonnet and the body.
The invention will be better understood from the following description of a preferred embodiment thereof, given by way of example only, reference being had to the accompanying drawings in which:
Figure 1 shows, in axial cross-section, a preferred embodiment of the invention;
Figure 2 is a top plan view of the valve of Figure 1 ;
Figures 3 and 4 are respectively a top plan view and a bottom plan view of a diaphragm for use in the valve of Figure 1 ;
Figure 5 is a side view of the diaphragm of Figures 3 and 4;
Figure 6 is a cross-section on the line A-A of Figure 3; and
Figure 7 is a cross-section on the line B-B of Figure 3.
Referring to the drawings, the diaphragm valve 1 comprises a valve body 2 having a flow passage 3 and a diaphragm opening 4. A valve bonnet 5 is secured to the valve body by means of threaded fasteners 6. The peripheral zone 10 of a diaphragm 7 is compressed between the valve body 2 and the valve bonnet 5 to maintain the diaphragm in sealing engagement with the valve body around the diaphragm opening 4. An operating mechanism 8 is provided for moving the diaphragm into sealing contact with a valve seat 9 provided on the valve body to close the valve to fluid flow.
Referring particularly to Figures 3-7 the diaphragm 7 is a rubber moulding which may optionally incorporate reinforcing fabric. As an alternative to a rubber moulding the diaphragm may be of a composite nature, having for example a PTFE facing and an elastomeric rubber backing. The peripheral zone 10 of the diaphragm which, in use, is compressed between the valve body and the valve bonnet comprises a relatively thick radially inner region 11 and a relatively thin radially outer region 12. The thickness of the radially inner region 11 substantially corresponds to the thickness of the diaphragm over the regions thereof which flex in use.
Both the upper and lower faces of the relatively thin radially outer region 12 are formed with raised beads 13 having the form shown in the drawings. Each raised bead on the upper surface overlies a raised bead formed on the lower surface with the result that the raised beads together form thickened regions of the relatively thin radially outer portion similar in nature to 0-ring seals. The lower face of the bonnet 5 is formed with a step 14 to accommodate the change of thickness of the diaphragm.
The operating mechanism 8 is of the rising handwheel type - that is to say as the handwheel is rotated to move the diaphragm from its closed position in engagement with the seat 9 towards it fully open position, the handwheel itself moves away from the body to expose progressively more of an indicator sleeve 15 provided for the purpose of giving a visual indication that the valve is open.
In assembling the above described valve the fasteners 6 may be tightened fully home to compress the relatively thin radially outer portion 12 of the diaphragm between the bonnet 5 and the valve body 2. If the fasteners 6 are fully tightened the size of the step 14 is such that the relatively thick radially inner portion of the diaphragm will be correctly compressed between the valve body 2 and the bonnet 5.
In the illustrated embodiment of the invention, as the handwheel is moved to compress the diaphragm 7 against the valve seat 9 the under face 16 of the handwheel will engage the upper surface 17 of the bonnet to prevent further compression of the diaphragm. By this means, over tightening of the valve is prevented.
Although the invention has been described with particular reference to a rising handwheel valve it will be appreciated that the invention is of general applicability to a wide range of diaphragm valves including those having other forms of operating mechanism.

Claims

1. A diaphragm valve comprising: a valve body defining a diaphragm opening and a valve seat; a valve bonnet secured to the valve body; a diaphragm closing the diaphragm opening, the peripheral zone of the diaphragm being compressed between the valve body and the valve bonnet to maintain the diaphragm in sealing engagement with the valve body around the diaphragm opening; and an operating mechanism for moving the diaphragm into sealing engagement with the valve seat to close the valve to fluid flow and away from the valve seat to open the valve to fluid flow, wherein the peripheral zone of the diaphragm comprises a relatively thick radially inner portion and a relatively thin radially outer portion both of which are compressed between the valve body and the valve bonnet, at least one of the valve body and the valve bonnet being stepped to accommodate the changes in thickness of the diaphragm.
2. A diaphragm valve according to Claim 1 , wherein the diaphragm is an elastomeric rubber moulding.
3. A diaphragm valve according to Claim 2, wherein the rubber moulding incorporates reinforcing fabric.
4. A diaphragm valve according to Claim 1 , wherein the diaphragm comprises a PTFE facing and an elastomeric rubber backing.
5. A diaphragm valve according to any preceding claim, wherein the relatively thin radially outer portion of the diaphragm comprises a relatively thin web of elastomeric material.
6. A diaphragm valve according to any preceding claim, wherein the relatively thin outer portion of the diaphragm is moulded with one or more raised beads to form a sealing bead in the region of the relatively thin portion of the diaphragm.
7. A diaphragm valve substantially as hereinbefore described with reference to the accompanying drawings.
PCT/GB1991/001973 1990-11-23 1991-11-11 Diaphragm valve Ceased WO1992009835A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9025531A GB2250081A (en) 1990-11-23 1990-11-23 Diaphragm valve
GB9025531.6 1990-11-23

Publications (1)

Publication Number Publication Date
WO1992009835A1 true WO1992009835A1 (en) 1992-06-11

Family

ID=10685894

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/001973 Ceased WO1992009835A1 (en) 1990-11-23 1991-11-11 Diaphragm valve

Country Status (4)

Country Link
EP (1) EP0513268A1 (en)
JP (1) JPH05501001A (en)
GB (1) GB2250081A (en)
WO (1) WO1992009835A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19738572A1 (en) * 1997-09-04 1999-03-25 Fastje Ines Metering valve with housing, through-hole and membrane
CN117072677A (en) * 2022-05-16 2023-11-17 日本泰雅阀门株式会社 Diaphragms and diaphragm valves

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4302556A1 (en) * 1993-01-29 1994-08-04 Mueller Apparatebau Gmbh & Co Diaphragm valve with closing stroke limitation
GB2399616A (en) * 2003-03-19 2004-09-22 Crane Process Flow Technologie Diaphragm valves and diaphragms therefor
CN117897571A (en) * 2021-09-04 2024-04-16 图沙尔·贾殷 Fluid Control Valves

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2918089A (en) * 1955-11-03 1959-12-22 Hills Mccanna Co Diaphragm assembly
US3075740A (en) * 1960-06-02 1963-01-29 Dow Chemical Co Diaphragm valve
DE8613806U1 (en) * 1986-05-22 1986-09-18 Schluff, Reinhold, Dipl.-Ing., 2304 Laboe Shut-off device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB955411A (en) * 1959-02-25 1964-04-15 Saunders Valve Co Ltd Improvements in and relating to valves for the control of fluids
DE2429448A1 (en) * 1974-06-19 1976-01-15 Beukert Elektro Christian DIAPHRAGM SEALED VALVE
US4339111A (en) * 1980-05-13 1982-07-13 Superior Stainless, Inc. Clean in place diaphragm valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2918089A (en) * 1955-11-03 1959-12-22 Hills Mccanna Co Diaphragm assembly
US3075740A (en) * 1960-06-02 1963-01-29 Dow Chemical Co Diaphragm valve
DE8613806U1 (en) * 1986-05-22 1986-09-18 Schluff, Reinhold, Dipl.-Ing., 2304 Laboe Shut-off device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19738572A1 (en) * 1997-09-04 1999-03-25 Fastje Ines Metering valve with housing, through-hole and membrane
CN117072677A (en) * 2022-05-16 2023-11-17 日本泰雅阀门株式会社 Diaphragms and diaphragm valves

Also Published As

Publication number Publication date
JPH05501001A (en) 1993-02-25
EP0513268A1 (en) 1992-11-19
GB9025531D0 (en) 1991-01-09
GB2250081A (en) 1992-05-27

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