GB2031122A – A diaphragm valve
– Google Patents
GB2031122A – A diaphragm valve
– Google Patents
A diaphragm valve
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Info
Publication number
GB2031122A
GB2031122A
GB7931516A
GB7931516A
GB2031122A
GB 2031122 A
GB2031122 A
GB 2031122A
GB 7931516 A
GB7931516 A
GB 7931516A
GB 7931516 A
GB7931516 A
GB 7931516A
GB 2031122 A
GB2031122 A
GB 2031122A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
valve
pressure member
spiral
hood
Prior art date
1978-09-13
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.)
Withdrawn
Application number
GB7931516A
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.)
FONDERIE ET ATELIERS DE MERSCH SA
Original Assignee
FONDERIE ET ATELIERS DE MERSCH 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.)
1978-09-13
Filing date
1979-09-11
Publication date
1980-04-16
1979-09-11
Application filed by FONDERIE ET ATELIERS DE MERSCH SA
filed
Critical
FONDERIE ET ATELIERS DE MERSCH SA
1980-04-16
Publication of GB2031122A
publication
Critical
patent/GB2031122A/en
Status
Withdrawn
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
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
Abstract
A diaphragm valve has a diaphragm support 5 disposed between a diaphragm 3, and a pressure member 4 connected with the diaphragm and by means of which the diaphragm 3, which is clamped at its edge between a valve housing 1 and a head 2 in which the pressure member 4 is accommodated, can be moved into and out of engagement with a valve seat in the valve housing by axial movement of the pressure member 4 in the valve hood. The valve hood has radially inwardly extending longitudinal ribs 6 which extend into corresponding radial slots in the pressure member 4 to guide member 4 in axial movement, the end faces of the ribs facing the diaphragm being arranged to engage the diaphragm support in the open condition of the valve and the member 4 engaging the diaphragm support 5 in the closed condition of the valve. The diaphragm support 5 is in the form of a resilient spiral member, instead of the plurality of discrete concentric rings used in known valves, and can thus be manufactured readily and cheaply as compared with known constructions requiring accurate machining.
Description
SPECIFICATION
A diaphragm valve
This invention relates to a diaphragm valve of the kind comprising a diaphragm clamped at its edge between a valve housing and a hood secured thereon, a pressure member mounted for rectilinear movement in a valve hood, towards and away from the valve housing, along an axis of the valve hood, by means of which pressure member the diaphragm can be brought into sealing-tight engagement with a valve seat on the valve housing, the hood having ribs which extend parallel with said axis and extend from the interior of the hood radially inwardly towards said axis, said ribs projecting into radial recesses in the pressure member, the ribs terminating, adjacent the diaphragm, in end surfaces facing generally towards the diaphragm, the valve including a diaphragm support disposed in the region between the diaphragm and said end surfaces of the ribs, whereby in a fully open position of the valve, when the pressure member is fully withdrawn from said valve seat, said end surfaces of the ribs engage the diaphragm support and the profile of each said end surface determines the profile of the diaphragm in axial section, the diaphragm support being arranged to be progressively entrained by the pressure member and thereby displaced from said end surfaces towards said valve seat during movement of the pressure member from a fully open to a fully closed position. Such a valve is herein referred to as being “of the kind specified”.
There are a number of known forms of diaphragm valve of this kind. A common feature of all known forms is that the diaphragm support used comprises a number of concentric rings. The number of rings, and consequently the thickness of each individual ring, determines the accuracy with which the diaphragm support follows the movement of the diaphragm. The accuracy of adaptation also depends on the axial clearance of the rings during the motion of the pressure member.
The radial clearance of the rings resulting from the spaces between them is also very important. If the rings are not manufactured with sufficient accuracy, the rings may become eccentrically displaced to one side of said axis of the pressure member. This is particularly likely to happen if the diaphragm valve has not been disposed horizontally i.e.
with said axis vertical. The result may be inaccuracy in the adaptation of the diaphragm support to the movement of the diaphragm and, more particularly, increased wear on the top of the diaphragm from the friction of the rings moving over it.
Diaphragm supports comprising concentric rings are disclosed e.g. by US Patent Specification No. 2,433,221 and French Patent
Specification No. 1,271,905. In the valves disclosed in both of these specifications, the rings have webs which, during continuous motion of the pressure member, grip each adjacent ring and entrain it in the motion. In this case, the motion of the concentric rings is indirect and stepwise. In other proposed valves (U.S. Patent Specification No.
2,388,988 and German Patent Specification
No. 1 5 00 140), the rings are in permanent contact with the pressure member and mechanically and continuously move therewith.
Diaphragm valves with such diaphragm supports have considerable advantages. However, owing to the high expense of the known embodiments, the holders are generally used only in cases when even a high-quality fabric reinforced diaphragm cannot meet the requirements. Known diaphragm supports cannot be mass-produced at low cost, even though they would considerably simplify the problem of choosing diaphragms having the appropriate quality in any particular case. For example, a diaphragm holder could often be used in place of a reinforcement, which makes the diaphragm much more expensive than a diaphragm without such reinforcement.
An object of the invention is to provide a diaphragm valve of the kind specified having a diaphragm support which is very efficient but easy to manufacture and insert.
To this end, according to the invention, there is provided a diaphragm valve comprising a diaphragm clamped at its edge between a valve housing and a hood secured therein, a pressure member mounted for rectilinear movement in the valve hood, towards and away from the valve housing, along an axis of the valve hood, by means of which pressure member the diaphragm can be brought into sealing-tight engagement with a valve seat on the valve housing, the hood having ribs which extend parallel with said axis and extend from the interior of the hood radially inwardly towards said axis, said ribs projecting into radial recesses in the pressure member, the ribs terminating, adjacent the diaphragm, in end surfaces facing generally towards the diaphragm, the valve including a diaphragm support disposed in the region between the diaphragm and said end surfaces of the ribs, whereby in a fully open position of the valve, when the pressure member is fully withdrawn from said valve seat, said end surfaces of the ribs engage the diaphragm support and the profile of each said end surface determines the profile of the diaphragm in axial section, the diaphragm support being arranged to be progressively entrained by the pressure member and thereby displaced from said end surfaces towards said valve seat during movement of the pressure member from a fully open to a fully closed position, said diaphragm support being in the form of a resil ient unitary member in the form of a spiral about said. axis.
The diaphragm support- in a valve embody ing-the invention is comparatively easy to manufacture. More particularly, there is a great reduction in cost compared with a diaphragm support consisting of a number af rings which have to be individually manufactured and accurately matched to on-e another.
The diaphragm support of a valve embodying the- invention, on the contrary, requires only a simple winding process, resulting automatically in the required small distance between turns. Even if there is a small clearance between the individual turns of the spiral, it does not matter. In contrast to individuallydisposed rings, which may become displaced to one side, the spiral has a self-centring effect as a result of its natural tension.
The turns of the spiral forming the diaphragm support can have any desired crosssection, e.g. square. A particularly advantage ous cross-section is a rectangle having. convexly rounded sides. The spiral can be made from a resilient metal, e.g. spring steel. Resilient non-metallic substances, more particularly plastics, may also be used.
The invention will be explained in detail with reference to an embodiment shown in the drawings, in which:
Figure 1 shows part of a diaphragm valve, embodying the invention, in crnsssection, and
Figure 2 is a plan view of the- spiral diaphragm support of the valve shown in Fig. 1.
Referring to the drawings, a non-reinforced rubber diaphragm 3 is clamped at its edge between a valve housing 1 and a hood 2 of a diaphragm valve. A pressure member 4 is mounted for rectilinear reciprocating movement along an axis represented by the chain broken line to the extreme right of the figure, said axis being a central axis of the valve, the parts to the right of the axis being omitted in the figure since they comprise a mirror image of the parts to the left. When the valve is closed by urging the member 4 axially in the direction towards the valve housing, the pressure member 4, via a diaphragm support 5, presses the diaphragm in sealing-tight manner against a seat surface formed in valve housing
1.The diaphragm support 5 consists of an elongate resilient member extending in a spiral about said axis of the valve, the support 5 being, of course, disposed between diaphragm 3 and pressure member 4. The inner surface of hood 2 has peripheral ribs 6 extending radially inwardly therefrom towards said axis, said ribs extending longitudinally parallel with said axis and being distributed at regular angular intervals around said axis. The ribs 6 extend freely into respective recesses or slots extending radially inwardly into the pressure member 4 from the periphery thereof.
As shown in Fig. 1, partly- by a curved continuous line and, in the region occupied, by member 4 in the Fig 1, partly by a curved- broken line as a continuation of said curved continuous line, each rib 6 terminates, in its region nearest the diaphragm 3, in an end surface of curvilinear profile as viewed in axial section, the end surface of each said rib 6 having the same profile.
In all positions of the pressure member 4, the diaphragm 3 bears against said support 5 which in turn bears against said end surfaces of ribs 6, or against the surface of member 4 which faces towards the diaphragm 3, or partly against the ribs 6 and partly against member 4, depending upon the axial position of the member 4.
Thus, in the fully open position of the valve, in which member 4 is at its furthest from the valve seat, all of the turns of the spiral support 5 bear against. said curvilinear end surfaces of the ribs 6 and as the member 4 is moved progressively towards the valve seat, i.e towards a closed position, successive turns of the spiral, at progressively greater distances from said axis, are engaged by the member 4 and displaced thereby from the ribs 6 towards the valve seat in the housing 1, as indicated in Fig. 1, until, when the valve is fully closed, all of the turns of the spiral bear upon member 4. Thus, during the. process of adjusting the pressure member 4, each turn of holder 5 follows each step of the resulting adjustment.
Claims (9)
1. A diaphragm valve comprising a diaphragm clamped at its edge between a valve housing and a hood secured thereon, a pressure member mounted for rectilinear movement in the valve hood, towards and away from the valve housing, along an axis of the valve hood, by means of which pressure member the diaphragm can be brought into sealing-tight engagement with a valve seat on the valve housing, the hood having ribs which extend parallel with said axis and extend from the interior of the hood radially inwardly tn- wards said axis, said ribs projecting into radial recesses in the pressure member, the ribs terminating, adjacent the diaphragm, in end surfaces facing generally towards the diaphragm, the valve including a diaphragm support disposed in the region between the diaphragm and said end surfaces of the ribs, whereby in a fully open position of the valve; when the pressure member is fully withdrawn from said valve seat, said end surfaces- of the ribs engage the diaphragm support and the profile of each said end surface determines the profile of the diaphragm in axial section, the diaphragm support being arranged to be
progressively entrained by the pressure mem
ber and thereby displaced from said end surfaces towards said valve seat during move
ment of the pressure member from- a fully open to a fully closed position, said diaphragm support being in the form of a resilient unitary member in the form of a spiral about said axis.
2. A diaphragm valve according to claim 1 in which the turns of the spiral formed by the diaphragm support have a circular crosssection.
3. A diaphragm valve according to claim 1, in which the turns of the spiral formed by the diaphragm support have, in cross section, the shape of a rectangle having rounded end faces.
4. A diaphragm valve according to claim 1, in which the resilient unitary member in the form of a spiral is made of resilient metal.
5. A diaphragm valve according to claim 4 in which the resilient unitary member in the form of a spiral is made of spring steel.
6. A diaphragm valve according to claim 1, in which the resilient unitary member in the form of a spiral is made of a resilient nonmetallic material.
7. A diaphragm valve according to claim 6 in which the resilient unitary member in the form of a spiral is made of a resilient plastics material.
8. A diaphragm valve substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
9. Any novel feature or combination of features disclosed herein.
GB7931516A
1978-09-13
1979-09-11
A diaphragm valve
Withdrawn
GB2031122A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
DE19782839804
DE2839804A1
(en)
1978-09-13
1978-09-13
DIAPHRAGM VALVE
Publications (1)
Publication Number
Publication Date
GB2031122A
true
GB2031122A
(en)
1980-04-16
Family
ID=6049331
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB7931516A
Withdrawn
GB2031122A
(en)
1978-09-13
1979-09-11
A diaphragm valve
Country Status (4)
Country
Link
DE
(1)
DE2839804A1
(en)
FR
(1)
FR2436310A1
(en)
GB
(1)
GB2031122A
(en)
LU
(1)
LU81668A1
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
EP0853205A3
(en)
*
1997-01-05
1998-12-09
Raphael Valves Industries (1975) Ltd.
Improved spring diaphragm for shut-off valves and regulators
Families Citing this family (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE102021129348A1
(en)
*
2021-11-11
2023-05-11
Sisto Armaturen S.A.
Flexible pressure distribution element
Family Cites Families (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE251644C
(en)
*
1900-01-01
DE251645C
(en)
*
DE538945C
(en)
*
1931-11-23
Elster & Co A G
Regulator for temperatures or pressures with corrugated membrane
GB365590A
(en)
*
1930-09-22
1932-01-22
Joseph Riley Eyre
Improvements relating to the actuating diaphragms of reducing valves, thermostatic control devices and the like
FR1432594A
(en)
*
1964-12-30
1966-03-25
Device for total support and, possibly, servo-control of a membrane
FR1600112A
(en)
*
1968-12-30
1970-07-20
1978
1978-09-13
DE
DE19782839804
patent/DE2839804A1/en
not_active
Ceased
1979
1979-08-07
FR
FR7920166A
patent/FR2436310A1/en
not_active
Withdrawn
1979-09-10
LU
LU81668A
patent/LU81668A1/en
unknown
1979-09-11
GB
GB7931516A
patent/GB2031122A/en
not_active
Withdrawn
Cited By (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
EP0853205A3
(en)
*
1997-01-05
1998-12-09
Raphael Valves Industries (1975) Ltd.
Improved spring diaphragm for shut-off valves and regulators
US6095484A
(en)
*
1997-01-05
2000-08-01
Raphael Valves Industries (1975) Ltd.
Spring diaphragm for shut-off valves and regulators
AU740396B2
(en)
*
1997-01-05
2001-11-01
Raphael Valves Industries (1975) Ltd.
Improved spring diaphragm for shut-off valves and regulators
AU740396C
(en)
*
1997-01-05
2007-05-17
Raphael Valves Industries (1975) Ltd.
Improved spring diaphragm for shut-off valves and regulators
Also Published As
Publication number
Publication date
DE2839804A1
(en)
1980-03-20
LU81668A1
(en)
1979-12-07
FR2436310A1
(en)
1980-04-11
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Legal Events
Date
Code
Title
Description
1981-12-02
WAP
Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)
