EP1529888B1 - Device for preventing backflow of liquids - Google Patents
Device for preventing backflow of liquids Download PDFInfo
- Publication number
- EP1529888B1 EP1529888B1 EP20040105563 EP04105563A EP1529888B1 EP 1529888 B1 EP1529888 B1 EP 1529888B1 EP 20040105563 EP20040105563 EP 20040105563 EP 04105563 A EP04105563 A EP 04105563A EP 1529888 B1 EP1529888 B1 EP 1529888B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- edge
- deformable
- pressure
- closed position
- flow member
- 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.)
- Active
Links
- 239000007788 liquid Substances 0.000 title claims description 14
- 239000000463 material Substances 0.000 claims description 14
- 239000007779 soft material Substances 0.000 claims description 7
- 239000002699 waste material Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 claims 1
- 238000007789 sealing Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
- E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
- E03C1/02—Plumbing installations for fresh water
- E03C1/10—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves
- E03C1/104—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves using a single check valve
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
- E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
- E03C1/12—Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
- E03C1/28—Odour seals
- E03C1/298—Odour seals consisting only of non-return valve
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F7/00—Other installations or implements for operating sewer systems, e.g. for preventing or indicating stoppage; Emptying cesspools
- E03F7/02—Shut-off devices
- E03F7/04—Valves for preventing return flow
Definitions
- the invention relates to a device for preventing backflow of liquids, in particular for use in a conveying line for (waste) water and the like, for example in sewage systems according to the preamble of claim 1.
- Such devices are known in various embodiments thereof, they may also be referred to as non-return valves.
- a device according to the preamble is disclosed in US 2,328,382 .
- This document describes flexible check valves and vacuum breakers which are formed from flexible material such as rubber. Coacting lips at an edge of the second end an abutting flexible sleeve member are formed from one piece of material.
- the object of the invention is to provide a novel device for preventing backflow of liquids.
- the device according to the invention has the features of the characterizing portion of claim 1.
- the edge on said second end is made up of at least two portions, which are interconnected in a pivot-like manner at their places of contact.
- the advantage of the portion of relatively soft material is that it is possible to obtain an adequate seal in this portion, also if the edge does not shut off completely. This is the case in particular if a liquid pressure prevails in the downstream portion of the conveying line. Said pressure will act on the outer side of the portion made of the relatively soft material, as a result of which said portion is squeezed tightly shut, as it were, and an especially adequate self-sealing action is obtained.
- pressure-resistant elements are provided in the portion made of the relatively soft material, which elements offer resistance in particular against pressure in a direction at least substantially parallel to the central axis of the second end.
- Figs. 1 - 4 show a device for preventing backflow of liquids, in particular for use in a conveying line for (waste) water and the like, for example in a pressurised sewer system.
- the invention can also be used in other liquid conveying lines, of course, in which the liquid being conveyed may or may not contain solid impurities.
- the device comprises a liquid-tight housing 1 (illustrated in dashed lines), in which a flow member 2 is accommodated.
- the housing comprises a first connection 3 and a second connection 4 at opposite ends for being connected to pipes or other types of channels of a liquid conveying system or the like.
- the flow member 2 has a first end 5 and a second end 6.
- the first end 5 is formed on the upstream end of a pipe-shaped portion 7 of the flow member 2. Said first end 5 is open at all times, and the pipe-shaped portion 7 is made of a substantially non-deformable material.
- the second end 6 is configured to be deformable between a substantially flat, tightly shut closed position, and a widened, open position.
- the second end 6 is configured similarly to the opening of a "squeeze purse".
- the second end 6 is provided with an edge 8 of a relatively hard material, which is biased to the closed position.
- Said material may be a harder rubber, for example, or an elastically deformable metal, such as steel or the like, which may be coated with a rubber.
- the material is biased to the closed position, or, in other words, the material is relaxed in said closed position, and a force must be exerted when deforming the edge 8 from the closed position.
- a memory effect is obtained, such that said second end 6 will not open until an internal pressure is exerted from the first connection 3.
- the first end 5 will move towards the closed position.
- the edge 8 consists of two edge portions 9 and 10, which are interconnected by pivot means 11 at both ends.
- the edge portions 9 and 10 extend in a substantially straight line between the pivot means 11 in the closed position (see Figs. 3 and 11 ), whilst the edge portions 9 and 8 have each been deformed into a semi-circular shape, a semi-oval shape (see Fig. 7 ) or other curved shape in the open position.
- the flow member 2 comprises a portion 12 of a relatively soft, deformable material, such as a soft rubber.
- Said portion 12 joins the pipe-shaped portion 7 and is provided with pressure-resistant elements 13, two in this case, which are aligned with the pivot means 11 in this embodiment.
- the pressure-resistant elements 13 ensure that said portion will resist deformation in a direction parallel to the central axis of the second end 6, i.e. parallel to the direction of flow of the flow member 2 in this embodiment.
- the portion 12 is therefore capable of deformation in a direction at least substantially perpendicularly to the direction of flow, but not in a direction parallel thereto.
- the soft material of said portion 12 can therefore be selected by its ability to provide an adequate seal in the closed position of the flow member 2.
- Said pressure-resistant elements may also be provided at other positions, of course, or other types of elements may be used, as long as the sealing action is not adversely affected thereby.
- the portion 12 is relatively long so as to ensure that the flow member 12 is shut off in an adequate manner.
- Figs. 5 - 8 show the situation in which the pressure at the first connection 3 is higher than at the second connection 4 of the housing 1, as a result of which liquid tends to flow from the first connection to the second.
- the fluid pressure causes the edge portions 9 and 10 of the edge to be deformed to a curved position, as a result of which a passage is formed at the second end 6 of the flow member 2 (see the arrows).
- Figs. 9 - 12 show the situation in which the pressure at the second connection 4 is higher than at the first connection 3. Said pressure causes the edge portions 9 and 10 to return to the biased position again, whilst the soft material of the portion 12 is pressed together inwardly to a closed position (see the arrows) by the external, higher fluid pressure, as a result of which a very good seal is obtained, also in the situation in which an incomplete seal is obtained at the edge 8, for example as a result of a hard particle still being present in the liquid at that location.
- the invention provides a device for preventing backflow of liquid that is remarkable for its reliable operation and for providing an adequate seal in the closed position.
Description
- The invention relates to a device for preventing backflow of liquids, in particular for use in a conveying line for (waste) water and the like, for example in sewage systems according to the preamble of
claim 1. - Such devices are known in various embodiments thereof, they may also be referred to as non-return valves. A device according to the preamble is disclosed in
US 2,328,382 . This document describes flexible check valves and vacuum breakers which are formed from flexible material such as rubber. Coacting lips at an edge of the second end an abutting flexible sleeve member are formed from one piece of material. - The object of the invention is to provide a novel device for preventing backflow of liquids.
- In order to accomplish that object, the device according to the invention has the features of the characterizing portion of
claim 1. - Advantageously, the edge on said second end is made up of at least two portions, which are interconnected in a pivot-like manner at their places of contact.
- In this way there is created a closure which is similar to that of the opening of a "squeeze purse".
- The advantage of the portion of relatively soft material is that it is possible to obtain an adequate seal in this portion, also if the edge does not shut off completely. This is the case in particular if a liquid pressure prevails in the downstream portion of the conveying line. Said pressure will act on the outer side of the portion made of the relatively soft material, as a result of which said portion is squeezed tightly shut, as it were, and an especially adequate self-sealing action is obtained.
- It is advantageous in this respect if pressure-resistant elements are provided in the portion made of the relatively soft material, which elements offer resistance in particular against pressure in a direction at least substantially parallel to the central axis of the second end.
- The presence of said pressure-resistant elements makes it possible to select the soft, deformable material by its sealing action rather than by its constructional strength. Said constructional strength is provided by the pressure-resistant elements.
- The invention will be explained in more detail hereinafter with reference to the drawings, which very schematically illustrate an embodiment of the device according to the invention.
-
Fig. 1 is a perspective view of a device according to the invention, in which a housing that surrounds the device is schematically indicated. -
Figs. 2, 3 and 4 are a side view, a front view and a top plan view, respectively, in which the subject matter ofFig. 1 is shown on a smaller scale. -
Figs. 5 - 8 are views corresponding toFigs. 1 - 4 , which show the device ofFigs. 1 - 4 in the open position thereof. -
Figs. 9 - 12 are views corresponding toFigs. 5 - 8 , which show the device in the closed position thereof. -
Figs. 1 - 4 show a device for preventing backflow of liquids, in particular for use in a conveying line for (waste) water and the like, for example in a pressurised sewer system. The invention can also be used in other liquid conveying lines, of course, in which the liquid being conveyed may or may not contain solid impurities. - The device comprises a liquid-tight housing 1 (illustrated in dashed lines), in which a
flow member 2 is accommodated. The housing comprises afirst connection 3 and asecond connection 4 at opposite ends for being connected to pipes or other types of channels of a liquid conveying system or the like. - The
flow member 2 has afirst end 5 and asecond end 6. Thefirst end 5 is formed on the upstream end of a pipe-shaped portion 7 of theflow member 2. Saidfirst end 5 is open at all times, and the pipe-shaped portion 7 is made of a substantially non-deformable material. - The
second end 6 is configured to be deformable between a substantially flat, tightly shut closed position, and a widened, open position. In this embodiment, thesecond end 6 is configured similarly to the opening of a "squeeze purse". For that purpose, thesecond end 6 is provided with anedge 8 of a relatively hard material, which is biased to the closed position. Said material may be a harder rubber, for example, or an elastically deformable metal, such as steel or the like, which may be coated with a rubber. - In either case, the material is biased to the closed position, or, in other words, the material is relaxed in said closed position, and a force must be exerted when deforming the
edge 8 from the closed position. In this way a memory effect is obtained, such that saidsecond end 6 will not open until an internal pressure is exerted from thefirst connection 3. When said pressure is released or reversed, thefirst end 5 will move towards the closed position. - In this case the
edge 8 consists of twoedge portions 9 and 10, which are interconnected by pivot means 11 at both ends. Thus, theedge portions 9 and 10 extend in a substantially straight line between the pivot means 11 in the closed position (seeFigs. 3 and11 ), whilst theedge portions 9 and 8 have each been deformed into a semi-circular shape, a semi-oval shape (seeFig. 7 ) or other curved shape in the open position. - At a position adjoining the
edge 8, theflow member 2 comprises aportion 12 of a relatively soft, deformable material, such as a soft rubber. Saidportion 12 joins the pipe-shaped portion 7 and is provided with pressure-resistant elements 13, two in this case, which are aligned with the pivot means 11 in this embodiment. The pressure-resistant elements 13 ensure that said portion will resist deformation in a direction parallel to the central axis of thesecond end 6, i.e. parallel to the direction of flow of theflow member 2 in this embodiment. Theportion 12 is therefore capable of deformation in a direction at least substantially perpendicularly to the direction of flow, but not in a direction parallel thereto. The soft material of saidportion 12 can therefore be selected by its ability to provide an adequate seal in the closed position of theflow member 2. Said pressure-resistant elements may also be provided at other positions, of course, or other types of elements may be used, as long as the sealing action is not adversely affected thereby. In this embodiment, theportion 12 is relatively long so as to ensure that theflow member 12 is shut off in an adequate manner. -
Figs. 5 - 8 show the situation in which the pressure at thefirst connection 3 is higher than at thesecond connection 4 of thehousing 1, as a result of which liquid tends to flow from the first connection to the second. The fluid pressure causes theedge portions 9 and 10 of the edge to be deformed to a curved position, as a result of which a passage is formed at thesecond end 6 of the flow member 2 (see the arrows). -
Figs. 9 - 12 show the situation in which the pressure at thesecond connection 4 is higher than at thefirst connection 3. Said pressure causes theedge portions 9 and 10 to return to the biased position again, whilst the soft material of theportion 12 is pressed together inwardly to a closed position (see the arrows) by the external, higher fluid pressure, as a result of which a very good seal is obtained, also in the situation in which an incomplete seal is obtained at theedge 8, for example as a result of a hard particle still being present in the liquid at that location. - From the foregoing it will be apparent that the invention provides a device for preventing backflow of liquid that is remarkable for its reliable operation and for providing an adequate seal in the closed position.
- The invention is not limited to the embodiment as described above and illustrated in the drawing, which can be varied in many ways within the scope of the appended claims.
Claims (8)
- A device for preventing backflow of liquids, in particular for use in a conveying line for (waste) water and the like, comprising a flow member (2) having a first end (5) and a second end (6), which first end is preferably open and which second end can be opened and closed, for which purpose the second end (6) is made of a deformable material, such that said second end is deformable between a substantially flat, closed position, and a squeezed-together, open position, said second end (6) being biased to the closed position, characterized in that the second end (6) is formed with an edge (8) which comprises a relatively hard material, which is biased to the closed position, and a portion (12) abutting the edge (8) and being made of relatively soft, deformable material such that the portion (12) can be squeezed.
- A device according to claim 1, wherein the edge (8) on said second end (6) is made up of at least two portions (9, 10), which are interconnected in a pivot-like manner at their places of contact (11).
- A device according to claim 1 or 2, wherein pressure-resistant elements (13) are provided in the portion (12) made of the relatively soft material, which elements offer resistance in particular against pressure in a direction at least substantially parallel to the central axis of the second end (6).
- A device according to claim 3, wherein said pressure-resistant elements (13) are provided at least in line with said pivot-like places of contact (11).
- A device according to any one of the claims 1 - 4, wherein a substantially non-deformable pipe-shaped portion (7) provided with said first end (5) abuts the portion (12) made of the relatively soft material.
- A device according to any one of the preceding claims, wherein the flow member (2) is accommodated in a liquid-tight housing (1) which surrounds the flow member and which comprises connections at both ends (3, 4) for being connected to further liquid conveying lines.
- A device according to any one of the claims 1 - 6, wherein the edge on the second end (6) is formed of a hard, rubbery material, or of an elastically deformable metal that is preferably coated with a rubbery material.
- A pipe for conveying liquid, in particular waste water, provided with a device according to any one of the preceding claims.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1024720 | 2003-11-06 | ||
NL1024720 | 2003-11-06 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1529888A1 EP1529888A1 (en) | 2005-05-11 |
EP1529888B1 true EP1529888B1 (en) | 2012-06-13 |
Family
ID=34432168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20040105563 Active EP1529888B1 (en) | 2003-11-06 | 2004-11-05 | Device for preventing backflow of liquids |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP1529888B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2787801C1 (en) * | 2022-04-06 | 2023-01-12 | Владимир Анатольевич Красноярский | Sewer check valve |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE602006006968D1 (en) | 2006-03-01 | 2009-07-09 | Intelligent Environmental Syst | Slotted one-way valve |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2328382A (en) | 1941-10-08 | 1943-08-31 | Jesse D Langdon | Flexible check valve and vacuum breaker |
US3334646A (en) * | 1965-03-15 | 1967-08-08 | Sloan Valve Co | Vacuum breakers |
FR2575538B3 (en) * | 1984-12-31 | 1987-07-24 | Fact Anal Scp | ANTI-POLLUTION DEVICE INSERABLE INTO A WATER DISTRIBUTION PIPE |
US4870992A (en) * | 1986-12-05 | 1989-10-03 | Augerscope, Inc. | Backflow prevention device |
GB2352497B (en) * | 1996-12-04 | 2001-04-18 | Hepworth Building Prod | Non-return device |
-
2004
- 2004-11-05 EP EP20040105563 patent/EP1529888B1/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2787801C1 (en) * | 2022-04-06 | 2023-01-12 | Владимир Анатольевич Красноярский | Sewer check valve |
Also Published As
Publication number | Publication date |
---|---|
EP1529888A1 (en) | 2005-05-11 |
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