DK177492B1 - Reflux valve and use - Google Patents
Reflux valve and use Download PDFInfo
- Publication number
- DK177492B1 DK177492B1 DKPA201200435A DKPA201200435A DK177492B1 DK 177492 B1 DK177492 B1 DK 177492B1 DK PA201200435 A DKPA201200435 A DK PA201200435A DK PA201200435 A DKPA201200435 A DK PA201200435A DK 177492 B1 DK177492 B1 DK 177492B1
- Authority
- DK
- Denmark
- Prior art keywords
- valve
- locking plate
- guide grooves
- pipe
- resilient
- Prior art date
Links
- 238000010992 reflux Methods 0.000 title claims abstract description 13
- 230000000903 blocking effect Effects 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 230000004888 barrier function Effects 0.000 claims description 28
- 238000007789 sealing Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 4
- 239000002351 wastewater Substances 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract 1
- 239000012535 impurity Substances 0.000 description 4
- 230000003213 activating effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- -1 for example Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- F16K3/0227—Packings
-
- 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
- F16K3/0281—Guillotine or blade-type valves, e.g. no passage through the valve member
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Sliding Valves (AREA)
Abstract
Opfindelsen omfatter en ventil (1) til spærring af tilbageløb af væske i rør (9), hvor ventilen (1) omfatter mindst en spærreplade (2A-2F), som kan bevæges i styrespor (21) på tværs af rørets (9) længderetning. Desuden omfatter opfindelsen anvendelsen af ventilen (1) til spærring af tilbageløb i kloakrør. Med opfindelsen opnås den fordel at ventilen (1) bliver mindre pladskrævende end de hidtil kendte konstruktioner, og dermed kan indbygges i lokaliteter, hvor det hidtil ikke har været muligt.The invention comprises a valve (1) for blocking reflux of liquid in pipes (9), the valve (1) comprising at least one locking plate (2A-2F) which can be moved in guide grooves (21) across the longitudinal direction of the pipe (9). . In addition, the invention comprises the use of the valve (1) for blocking reflux in sewer pipes. With the invention, the advantage is obtained that the valve (1) becomes less space consuming than the previously known constructions, and thus can be built into locations where it has not hitherto been possible.
Description
DK 177492 B1DK 177492 B1
Ventil til spærring af tilbageløb samt anvendelseReflux valve and use
Opfindelsen angår en ventil til spærring af tilbageløb af væske i rør såsom spildevand i kloakrør hvor ventilen omfatter mindst en spærreplade, som 5 kan bevæges i styrespor på tværs af rørets længderetning, hvor spærrepladen omfatter to parallelle sideflader, der kan glide i styresporene , samt en halvcirkelform der forbinder de to parallelle sideflader, hvor halvcirkelformens yderside er eftergivelig og elastisk.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a valve for blocking reflux of liquid in pipes, such as sewage wastewater, wherein the valve comprises at least one barrier plate which can be moved in guide tracks across the longitudinal direction of the pipe, wherein the barrier plate comprises two parallel side surfaces which can slide in the guide tracks and a a semi-circular shape connecting the two parallel side surfaces, the exterior of the semi-circular shape being resilient and resilient.
10 Desuden angår opfindelsen anvendelse af ventil til spærring af tilbageløb af væske i rør.In addition, the invention relates to the use of a valve for blocking the return of liquid in pipes.
Det er kendt at fremstille ventilsystemer til spærring af tilbageløb af spildevand i ledningsnet, hvor disse normalt er relativt store systemer, som 15 indbygges i kloakledninger eller i forbindelse med brønde.It is known to produce valve systems for blocking the reflux of wastewater into wiring networks, where these are usually relatively large systems, which are built into sewer lines or in connection with wells.
Fra US 2829862 A (JOSEPH) kendes en spærreventil, hvor ventilen omfatter mindst en spærreplade, som bevæges i et styrespor på tværs af rørets længderetning. Spærrepladen omfatter to parallelle sideflader, der 20 kan glide i styresporene samt en halvcirkelform, der forbinder de to parallelle sideflader og som er eftergivelig og elastisk i kanten i kraft af en pakning, der er arrangeret rundt i kanten.From US 2829862 A (JOSEPH) a locking valve is known, the valve comprising at least one locking plate which is moved in a guide groove across the longitudinal direction of the pipe. The ratchet plate comprises two parallel side surfaces which can slide in the guide grooves and a semi-circular shape connecting the two parallel side surfaces and which is resilient and elastic at the edge by virtue of a gasket arranged around the edge.
Det har imidlertid vist sig, at der er nogle ulemper ved denne kendte teknik, 25 herunder at den pakning, som danner elasticitet og eftergivelighed i spærrepladen, ikke i praksis er tilstrækkelig effektiv.However, it has been found that there are some drawbacks to this prior art, including that the gasket which produces elasticity and resilience in the barrier plate is not sufficiently effective in practice.
Det er derfor et formål med opfindelsen, at forbedre den kendte typer ventiler samt anvendelsen.It is therefore an object of the invention to improve the known types of valves as well as the use.
Opfindelsens formål tilgodeses ved en ventil af den i indledningen til krav 1 30 DK 177492 B1 2 angivne type, som er karakteristisk ved, at halvcirkelformens yderside er eftergivelig og elastisk ved anvendelse af et spor, som løber langs ydersiden.The object of the invention is met by a valve of the type specified in the preamble of claim 1, which is characterized in that the exterior of the semicircular form is resilient and elastic using a groove running along the exterior.
5 Anvendelsen af et spor i spærrepladens halvcirkelformede yderside giver en selvtætnende effekt hvorved effektiviteten optimeres.5 The use of a groove in the semi-circular exterior of the barrier plate provides a self-sealing effect, thereby optimizing efficiency.
Øvrige hensigtsmæssige udførelsesformer for fremgangsmåden er angivet i kravene 2 til 6.Other suitable embodiments of the method are set forth in claims 2 to 6.
1010
Som nævnt angår opfindelsen også anvendelsen til spærring af tilbageløb i kloakrør.As mentioned, the invention also relates to the use for blocking reflux in sewer pipes.
Herved bliver det muligt, at indbygge tilbageløbsspærringer i kloakrør, hvor 15 det ikke hidtil har været muligt på grund af begrænset plads.This makes it possible to incorporate reflux barriers in sewer pipes, where it has not been possible so far due to limited space.
Flere hensigtsmæssige udførelsesformer for anvendelsen fremgår af krav 10.Several suitable embodiments of the use are set forth in claim 10.
20 Opfindelsen skal herefter nærmere forklares under henvisning til tegningerne, på hvilke:The invention will now be explained in more detail with reference to the drawings, in which:
Fig. 1 viser i et snitbillede en ventil til et kloakrør med to spærreplader 25 Fig. 2 viser et tværsnit af en spærreplade, der kan bevæges i styrFIG. 1 shows in a sectional view a valve for a sewer pipe with two locking plates 25 FIG. 2 shows a cross section of a movable guide plate
Fig. 3 viser en ventil, der kan betjenes med et håndsving, monteret til et rørFIG. 3 shows a valve that can be operated by a crank mounted to a pipe
Fig. 4 viser en spærreplade og et udsnit af et kloakrør med en urenhed, der 30 omsluttes af spærrepladens eftergivelige yderside.FIG. 4 shows a barrier plate and a section of a sewer pipe with an impurity that is enclosed by the resilient outer surface of the barrier plate.
DK 177492 B1 3DK 177492 B1 3
Fig. 5 viser som fig. 4 en spærreplade og et udsnit af et kloakrør med en urenhed, der omsluttes af spærrepladens elastiske periferi.FIG. 5 shows as FIG. 4 shows a barrier plate and a section of a sewer pipe with an impurity enclosed by the elastic periphery of the barrier plate.
Fig. 6 viser en spærreplade fremstillet med en fordybning, der løber langs 5 spærrepladens cirkelformede overfladedel.FIG. 6 shows a barrier plate made with a recess running along the circular surface portion of the barrier plate.
Fig. 7 viser bagsiden af spærrepladen vist i fig. 6.FIG. 7 shows the back side of the barrier plate shown in FIG. 6th
Fig. 8 viser en spærreplade fremstillet med en gummi i den cirkelformede 10 overfladedel.FIG. Figure 8 shows a barrier plate made with a rubber in the circular surface 10.
Fig. 9 viser en spærreplade indbygget i et kloakrør, som desuden er forsynet med en flyder-baseret spærreanordning.FIG. 9 shows a barrier plate built into a sewer pipe which is further provided with a float-based barrier device.
15 Fig. 10 viser en principtegning af en ventil med spærreplader samt et trykudligningskammer.FIG. 10 shows a principle drawing of a valve with locking plates and a pressure equalization chamber.
På fig. 1 er med 1 betegnet vist et tværsnit af en ventil til spærring af tilbageløb af væske i rør 9.In FIG. 1 is a cross-sectional view of a valve for blocking reflux of liquid in pipe 9.
20 Væsken i røret 9 har en normalflowretning, som anført ved pilen 10, og ventilen 1 skal spærre for tilbageløb af væske, der vil strømme i den modsatte retning som anført ved pilen 11.The fluid in the tube 9 has a normal flow direction, as indicated by arrow 10, and valve 1 is to block flow of liquid that will flow in the opposite direction as indicated by arrow 11.
25 I den foretrukne udførelsesform af ventilen 1, som er vist i fig. 1, er der i røret 9 indbygget 2 uafhængige spærreplader 2A og 2B, der kan bevæges på tværs af rørets 9 længderetning og derved åbne eller lukke for væskestrømningen i røret 9.In the preferred embodiment of the valve 1 shown in FIG. 1, there are 2 independent barrier plates 2A and 2B built into the tube 9, which can be moved transversely of the longitudinal direction of the tube 9, thereby opening or closing the fluid flow in the tube 9.
30 Spærrepladen 2A kan i fig. 1 bevæges op og ned i røret 9 ved aktivering af et håndsving 3, mens spærrepladen 2B kan aktiveres af en motor 4, der via DK 177492 B1 4 tandhjul 5 og 6 driver et gevindstag, som kan trække spærrepladen 2B op eller ned i røret 9.The locking plate 2A can be seen in FIG. 1 is moved up and down in the tube 9 by activating a crank 3, while the locking plate 2B can be actuated by a motor 4, which via DK 177492 B1 4 gears 5 and 6 drives a threaded rod which can pull the locking plate 2B up or down in the tube 9 .
Den motorstyrede spærreplade 2B kan aktiveres automatisk, såfremt der 5 tilkobles et føleraggregat, der eksempelvis kan måle væskestanden, og dermed aktivere spærrepladen 2B og lukke for væskestrømningen i røret såfremt væskeflowretningen ændres fra retning 10 til retning 11.The motor controlled locking plate 2B can be activated automatically if 5 is connected to a sensor assembly which can, for example, measure the liquid level, thus activating the locking plate 2B and closing the liquid flow in the pipe if the liquid flow direction changes from direction 10 to direction 11.
Et sådant føleaggregat vil også kunne anvendes til at udsende alarm, 10 hvorved spærrepladen 2A manuelt kan lukkes.Such a sensing unit may also be used for issuing alarms, whereby the blocking plate 2A can be manually closed.
Spærreplader 2A,2B og motor 4 samt gearudveksling 6,5 er indbygget i og beskyttet af et hus 7.Locking plates 2A, 2B and motor 4 as well as gear exchange 6.5 are built into and protected by a housing 7.
15 Som det vil fremgå af fig. 1, er spærrepladerne 2A, 2B vinklet i en vinkel 8 i forhold til længderetningen af røret 9, som målt fra normalflowretningen (10) er mellem 70 og 90 grader fortrinsvis mellem 75 og 85 grader mere fortrinsvis 82 grader.15 As will be apparent from FIG. 1, the barrier plates 2A, 2B are angled at an angle 8 with respect to the longitudinal direction of the tube 9 which, as measured from the normal flow direction (10), is between 70 and 90 degrees, preferably between 75 and 85 degrees, more preferably 82 degrees.
20 Hermed opnås, at spærrepladerne 2A, 2B får en selvtætnende effekt, når tilbageløbsvæske, som der skal spærres for, presser mod spærrepladerne 2A, 2B i retningen 10.Hereby it is obtained that the blocking plates 2A, 2B have a self-sealing effect when the reflux liquid to be blocked presses against the blocking plates 2A, 2B in the direction 10.
Fig. 2 viser et tværsnit af en spærrepladen 2B, som kan bevæges på tværs 25 af længderetningen i eksempelvis et kloakrør.FIG. 2 shows a cross section of a barrier plate 2B which can be moved transversely of the longitudinal direction in, for example, a sewer pipe.
Spærrepladen 2B bevæges i mekaniske styrespor 21, og bevæges ved aktivering af et gevindstag 12, der kan drejes i et gevindhul 13 og derved bevæge spærrepladen op og ned langs gevindstaget 12.The locking plate 2B is moved in mechanical guide grooves 21 and is moved by activating a threaded rod 12 which can be rotated in a threaded hole 13, thereby moving the locking plate up and down along the threaded rod 12.
Gevindsstaget 12 kan i den i fig. 2 viste konfiguration aktiveres via et 30 DK 177492 B1 5 tandhjul 6.In the embodiment shown in FIG. 2 is activated via a gear 6.
Som det vil fremgå af fig. 2 er spærrepladen nederst udformet med en halvcirkulær yderside, hvor diameteren af cirkelformen er formkomplementær til 5 den indre diameter af det rør 9, hvori spærrepladen 2B skal placeres.As will be seen from FIG. 2, the barrier plate is formed at the bottom with a semicircular exterior, the diameter of the circle shape being complementary to the inner diameter of the tube 9 in which the barrier plate 2B is to be placed.
Fig. 3 viser en ventil 1, der er klar til indbygning i eksempelvis et kloakrørs net, med hus 7, rør 9 og håndsving 3.FIG. 3 shows a valve 1 ready for incorporation in, for example, a sewer pipe net, with housing 7, pipe 9 and crank 3.
10 I fig. 4 er vist et udsnit af en ventil 1 med en spærreplade 2C, som er ført ned i bunden af et rør 9, og derved spærrer for tilbageløb af væske i røret 9.10 In FIG. 4 is a sectional view of a valve 1 with a locking plate 2C, which is inserted into the bottom of a pipe 9, thereby blocking the return of liquid in the pipe 9.
Spærrepladen er udformet med en elastisk overflade i den 15 halvcirkelformede runding, der er i berøring med røret 9.The barrier plate is formed with an elastic surface in the 15 semicircular round contacting the tube 9.
I den i fig. 4 viste udførelsesform er den elastiske overflade dannet ved anvendelse af en fordybning eller et spor 15, som løber langs med overfladen 14, der kommer i berøring med rørets 9 inderside.In the embodiment shown in FIG. 4, the resilient surface is formed by using a recess or groove 15 which runs along the surface 14 which contacts the inside of the tube 9.
2020
Den elastiske overflade sikrer god kontakt mellem røret 9 og spærrepladen 2C, hvorved spærrepladen 2C effektivt kan blokere for tilbageløb af væske i røret 9, selv om der i givet fald er urenheder 16 i røret, idet den elastiske overflade 14 omslutter eventuelle urenheder 16, som vist i fig. 4.The resilient surface ensures good contact between the tube 9 and the barrier plate 2C, whereby the barrier plate 2C can effectively block the flow of liquid in the tube 9, even if there are impurities 16 in the tube, the elastic surface 14 enclosing any impurities 16 which shown in FIG. 4th
2525
Spærrepladen 2C er forsynet med eftergivelige læber 17 for tætning mellem spærreplade 2C og styrespor.The latch plate 2C is provided with resilient lips 17 for sealing between the latch plate 2C and guide grooves.
Endvidere ses på fig. 4 at spærrepladen 2C er forsynet med et gevindhul 30 13 samt undersænkede huller 18 til samleskruer.Furthermore, in FIG. 4, the locking plate 2C is provided with a threaded hole 30 13 and submerged holes 18 for connecting screws.
DK 177492 B1 6 I fig. 5 er vist en spærreplade 2D, der adskiller sig fra den i fig. 4 viste ved at anvende en O-ring 19 til tætning mellem spærrepladen 2D og styrespor 21.DK 177492 B1 6 In fig. 5 shows a barrier plate 2D which differs from that of FIG. 4 by using an O-ring 19 for sealing between the latch plate 2D and guide groove 21.
5 Fig. 6 viser en spærreplade 2E, som er fremstillet med et spor 15, der løber langs med ydersiden 14 af den halvcirkulære overfladedel, og dermed er medvirkende til at overfladen bliver elastisk.FIG. 6 shows a barrier plate 2E which is made with a groove 15 which runs along the outer surface 14 of the semicircular surface part, thus contributing to the surface being elastic.
Desuden er sporet 15 med til at fremme den selvtætnende effekt, som 10 tidligere er beskrevet omkring vinklingen 8, når tilbageløbsvæske presser mod sporets 15 inderside.In addition, the groove 15 helps promote the self-sealing effect 10 previously described around the angle 8 when refluxing presses against the inside of the groove 15.
I en foretrukket udførelsesform vil spærrepladens 2E overfladedel, der omfatter to parallelle sideflader 20A, 20B, der kan glide i styresporene 21, 15 samt en halvcirkelform 20C, der forbinder de to parallelle sideflader 20A, 20B være fremstillet i et polymert materiale.In a preferred embodiment, the surface portion of the barrier plate 2E comprising two parallel side faces 20A, 20B which can slide in the guide grooves 21, 15 and a semicircular shape 20C connecting the two parallel side faces 20A, 20B is made of a polymeric material.
Materialet over tætningsemnet, som i fig. 6 er en O-ring 19, kan eksempelvis være messing.The material over the sealing blank, as in FIG. 6 is an O-ring 19, for example may be brass.
2020
Fig. 7 viser bagsiden af den i fig. 6 viste spærreplade 2EFIG. 7 shows the back side of the one shown in FIG. 6 blocking plate 2E
I fig. 8 er vist en udførelseform af en spærreplade 2F, hvor den halvcirkulære overfladedel 22 er fremstillet i et blødt elastisk polymert 25 materiale såsom eksempelvis silikonegummi, hvorved den halvcirkelformede overfladedel opnår den ønskede eftergivelighed og elasticitet.In FIG. 8, an embodiment of a barrier plate 2F is shown, wherein the semi-circular surface portion 22 is made of a soft elastic polymeric material such as, for example, silicone rubber, whereby the semi-circular surface portion achieves the desired resilience and elasticity.
Fig. 9 viser en ventil 1 med en spærreplade 2B indbygget i et rør 9, som er 30 styret af en motor 4, og hvor der desuden er tilkoblet en flyder 23 baseret lukkemekanisme 24,25, som eksempelvis kan monteres i en brønd.FIG. 9 shows a valve 1 with a blocking plate 2B built into a pipe 9, which is controlled by a motor 4, and in addition there is connected a float 23 based closing mechanism 24,25, which can be mounted, for example, in a well.
DK 177492 B1 7 I fig. 10 er vist en foretrukket udførelsesform af en ventil 1 som foruden spærreplader 2A,2B er forsymet med et trykudligningskammer 26, som via en ventilåbning 27 er forbundet til røret hvori ventilen 1 er indbygget.DK 177492 B1 7 In fig. 10, there is shown a preferred embodiment of a valve 1 which, in addition to locking plates 2A, 2B, is provided with a pressure relief chamber 26 which is connected via a valve opening 27 to the pipe in which the valve 1 is incorporated.
5 10 15 20 25 305 10 15 20 25 30
Claims (7)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DKPA201200435A DK177492B1 (en) | 2012-04-30 | 2012-06-27 | Reflux valve and use |
| PCT/DK2013/000026 WO2013163997A1 (en) | 2012-04-30 | 2013-04-08 | Backflow blocking valve and application |
| EP13785262.0A EP2844806A4 (en) | 2012-04-30 | 2013-04-08 | Backflow blocking valve and application |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK201200289 | 2011-04-12 | ||
| DKPA201200289 | 2012-04-30 | ||
| DK201200435 | 2012-06-27 | ||
| DKPA201200435A DK177492B1 (en) | 2012-04-30 | 2012-06-27 | Reflux valve and use |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DK177492B1 true DK177492B1 (en) | 2013-07-15 |
Family
ID=48749678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DKPA201200435A DK177492B1 (en) | 2012-04-30 | 2012-06-27 | Reflux valve and use |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2844806A4 (en) |
| DK (1) | DK177492B1 (en) |
| WO (1) | WO2013163997A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023285506A1 (en) * | 2021-07-14 | 2023-01-19 | Z & J Technologies Gmbh | Slide gate valve, operating method and use |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1799849A (en) * | 1930-01-10 | 1931-04-07 | Caroline Hessel | Sewer-flooding-control apparatus |
| US2829862A (en) * | 1954-04-14 | 1958-04-08 | Wey Joseph | Gate valve |
| DE1901282A1 (en) * | 1969-01-11 | 1970-07-30 | W Er Dr Ing Werner | Ductless sewer or gutter scraper |
| US3749114A (en) * | 1971-11-26 | 1973-07-31 | R Johnstone | Two way pulp stock valve |
| US6698766B2 (en) * | 2002-05-30 | 2004-03-02 | Richard D. Simon | Slide gate sealing system |
| DE102005009777B4 (en) * | 2005-01-05 | 2008-08-21 | Aco Severin Ahlmann Gmbh & Co. Kg | backwater valve |
| US7163191B2 (en) * | 2005-04-01 | 2007-01-16 | Salina Vortex Corporation | High pressure gate valve |
-
2012
- 2012-06-27 DK DKPA201200435A patent/DK177492B1/en not_active IP Right Cessation
-
2013
- 2013-04-08 WO PCT/DK2013/000026 patent/WO2013163997A1/en not_active Ceased
- 2013-04-08 EP EP13785262.0A patent/EP2844806A4/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013163997A1 (en) | 2013-11-07 |
| EP2844806A1 (en) | 2015-03-11 |
| EP2844806A4 (en) | 2016-04-06 |
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Effective date: 20170630 |