EP2439346A1 - Safety fitting - Google Patents
Safety fitting Download PDFInfo
- Publication number
- EP2439346A1 EP2439346A1 EP20110182568 EP11182568A EP2439346A1 EP 2439346 A1 EP2439346 A1 EP 2439346A1 EP 20110182568 EP20110182568 EP 20110182568 EP 11182568 A EP11182568 A EP 11182568A EP 2439346 A1 EP2439346 A1 EP 2439346A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sealing ring
- sealing
- contour
- closure body
- side portion
- 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.)
- Granted
Links
- 238000007789 sealing Methods 0.000 claims abstract description 164
- 230000001419 dependent effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009795 derivation Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000284 resting effect Effects 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
- E03C1/106—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves using two or more check valves
-
- 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
- E03C1/108—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves having an aerating valve
Definitions
- the invention relates to a safety valve, namely a backflow preventer or a system separator, according to the preamble of claim 1.
- the non-return valve disclosed therein has a housing with a supply line or a supply nozzle, a discharge or a discharge nozzle and a drain or a drain neck.
- a valve is formed, which is formed by a serving as a valve body closure body and a valve seat, wherein the valve seat is formed by a radially inner sealing lip of a sealing ring.
- the closure body In a passage position of the valve of the DE 27 51 468 C2 known backflow preventer, in which the supply line is connected to the drain, the closure body occupies a first, lowered position, wherein the closure body closes the drain in this first position. In a release position of the valve, in which the supply line is separated from the discharge line, the closure body assumes a second, raised position, the closure body releasing the drain in this second position. In the disconnected position of the valve or in the second position of the closure body, the inner sealing lip of the sealing ring, which forms the valve seat of the valve, abuts an outer contour of the closure body. In the passage position of the valve or in the first position of the closure body, the inner sealing lip of the sealing ring, which forms the valve seat of the valve, does not abut against the outer contour of the closure body.
- the relative position between the sealing ring providing the valve seat and the closure body providing the valve body is determined by a pressure difference between an inlet-side pressure on the closure body and an outlet-side pressure on the closure body. Then, when the pressure difference between the input-side pressure and the output-side pressure at the closure body is positive and greater than a threshold, the closure body is displaced to the second position so that the valve is opened and the supply line is connected to the drain. Then, however, when the pressure difference is smaller than this limit, the valve closes automatically by the closure body occupies the first position and thereby the inner sealing lip of the sealing ring comes to rest on the outer contour of the closure body.
- the sealing lip of the sealing ring then provides a sealing function between the sealing ring and the closure body when the pressure difference is positive and smaller than the defined limit value. Then, however, when in the disconnected position, the pressure difference between the input-side pressure and the output-side pressure is negative, that is, when there is a negative pressure in the supply line, the sealing element may not provide sufficient sealing function. This is a disadvantage.
- the system separator after the EP 1 801 297 A2 has a housing with a supply line or a supply connection, a discharge or a discharge connection and a drain or a discharge connection.
- a closure body is positioned, via which in a first position, the supply and the discharge under obstruction of the drain connectable and via which in a second position, the supply line and the discharge are releasable under release of the drain.
- an input-side backflow preventer is included in the closure body of the system separator after the EP 1 801 297 A2 .
- An outlet-side backflow preventer is included in the discharge or in the discharge connection.
- a sealing ring With a portion of the closure body, a sealing ring cooperates, wherein the sealing ring in both positions of the closure body rests against an outer contour of this portion of the closure body. Then, when a positive pressure difference between an input-side pressure related to the sealing ring and an output-side pressure related to the sealing ring bears against this portion of the closure body, the sealing ring can provide a good sealing function. On the other hand, if this pressure difference is negative, that is, if there is a negative pressure in the supply line, the sealing ring may under certain circumstances not be able to provide a sufficient sealing function. This is a disadvantage.
- the invention is based on the object to provide a novel safety valve with improved sealing function.
- This object is achieved by a safety fitting according to claim 1.
- cooperating with the closure body sealing ring comprises a further inner sealing contour, which also abuts the outer contour of the closure body at least in the second position of the closure body and provides a sealing function between the sealing ring and the closure body at a negative pressure difference between an input-side pressure and an output-side pressure ,
- the sealing ring of the safety fitting has at least two radially inner sealing contours, the further inner sealing contours providing the sealing function with a negative pressure difference between the input-side and the output-side pressure.
- the present invention relates to a safety valve designed as a backflow preventer or as a system separator.
- the basic structure and the basic operation of a backflow preventer and system separator are familiar to the person skilled in the art and require no further explanation.
- Fig. 1 shows a cross section through a trained as a system separator 10 safety valve.
- the system separator 10 or the safety fitting comprises a housing 11, which has a feed line 12 or a feed nozzle, a drain 13 or a discharge nozzle and a drain 14 or a discharge nozzle.
- a closure body 15 is positioned in the housing 11.
- the closure body 15 connects in a first position, the supply line 12 and the discharge line 13 obstructing the drain 14. This first position of the closure body 15 is in Fig. 1 shown. In a second position, in which the closure body 15 opposite to in Fig. 1 In the first position shown, the closure body 15 separates the inlet 12 and the outlet 13, releasing the drain 14.
- an input-side backflow preventer 16 of the system separator 10 is received in the closure body 15.
- An outlet-side backflow preventer 17 of the system separator 10 is received in the discharge line 13 or in the discharge connection.
- Fig. 2 shows the section X of the Fig. 1 , where in Fig. 2 the sealing ring 18 is shown in an undeformed state for the sake of simplicity.
- the sealing ring 18 is received in a recess 20 of a portion of the housing 11.
- the sealing ring 18 has an inner or radially inner sealing contour 21, which is preferably formed as a sealing lip, said radially inner sealing contour 21 in the system separator 10 of Fig. 1 both in the first position and in the second position of the closure body 15 rests against the outer contour 19 of the closure body 15 and provides a sealing function at a positive pressure difference between an input-side pressure and an output-side pressure.
- the sealing ring 18 has, in addition to the inner sealing contour 21, a further, inner sealing contour 22, which is likewise preferably designed as a sealing lip.
- This additional, inner sealing contour 22 is at the system separator 10 of Fig. 1 also in both the first position and in the second position of the closure body 15 on the outer contour 19 of the closure body 15 and then, if the input side, a negative pressure prevails, so if the pressure difference between the input-side pressure and the output-side pressure is negative, a Sealing function ready.
- the radially inner contour of the sealing ring 18 is concave, ie in the sealing ring, contoured.
- the sealing ring 18 has radially outward on outer projections 25 and 26. These projections 25 and 26, which are formed on the radially outer contour of the sealing ring 18, lie on the recess 20, which serves to receive the sealing ring 18 at.
- the sealing ring 18 shown there is symmetrically contoured, namely such that a formed on the input-side portion 23 of the sealing ring 18, outer projection 25 and the inner sealing contour 21, which is also formed on the input-side portion 23 of the sealing ring 18, as well as the output-side section 24 of the sealing ring 18 formed outer projection 26 and also formed on the output-side portion 24 sealing contour 22 each contoured similar, in particular lip-like, are.
- the respective sealing ring 18 is asymmetrically contoured in such a way that the radially outer projection 25 formed on the input-side section 23 of the sealing ring 18 and the radially inner sealing contour 21 also formed on the input-side section 23, which lies opposite the outer projection 25 on the input-side section 23, similar, in particular lip-like, are contoured, whereas the formed on the output-side portion 24, radially outer projection 26 and also formed on the output-side portion 24, radially inner sealing contour 22 of the sealing ring 18 are contoured non-uniform.
- Fig. 4 is the radially outer projection 26 of the sealing ring 18, which is formed on the output-side portion 24 thereof, contoured in cross-section trapezoidal.
- Fig. 5 In contrast, the radially outer projection 26 of the sealing ring 18, which is formed on the output-side portion 24 of the same, in cross-section spherically or spherically contoured.
- both at the input-side portion 23 and at the output-side portion 24 of the sealing ring 18 of the respective radially outer projection 25 and 26 and the respective opposite, radially inner sealing contour 21 and 22 are contoured non-uniform.
- respective radially inner sealing contour 21 and the respective radially outer projection 25 may be contoured unevenly at the input-side portion 23, whereas the respective radially inner sealing contour 22 and the respective radially outer projection 26 may be similarly contoured on the output-side portion 24.
- this adhesion forces between the sealing contours 21, 22 and the closure body 15 are adjustable, which are to be overcome at a pressure-difference-dependent displacement of the closure body 15.
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Closures For Containers (AREA)
- Check Valves (AREA)
Abstract
Description
Die Erfindung betrifft eine Sicherungsarmatur, nämlich einen Rückflussverhinderer oder einen Systemtrenner, nach dem Oberbegriff des Anspruchs 1.The invention relates to a safety valve, namely a backflow preventer or a system separator, according to the preamble of claim 1.
Aus der
In einer Durchlassstellung des Ventils des aus der
Beim Rückflussverhinderer nach der
Aus der
Mit einem Abschnitt des Verschlusskörpers wirkt ein Dichtring zusammen, wobei der Dichtring in beiden Positionen des Verschlusskörpers an einer Außenkontur dieses Abschnitts des Verschlusskörpers anliegt. Dann, wenn eine positive Druckdifferenz zwischen einem auf den Dichtring bezogenen eingangseitigen Druck und einem auf den Dichtring bezogenen ausgangseitigen Druck an diesem Abschnitt des Verschlusskörpers anliegt, kann der Dichtring eine gute Dichtfunktion bereitstellten. Dann hingegen, wenn diese Druckdifferenz negativ ist, also wenn also in der Zuleitung ein Unterdruck herrscht, kann den Dichtring unter Umständen keine ausreichende Dichtfunktion bereitstellen. Dies ist von Nachteil.With a portion of the closure body, a sealing ring cooperates, wherein the sealing ring in both positions of the closure body rests against an outer contour of this portion of the closure body. Then, when a positive pressure difference between an input-side pressure related to the sealing ring and an output-side pressure related to the sealing ring bears against this portion of the closure body, the sealing ring can provide a good sealing function. On the other hand, if this pressure difference is negative, that is, if there is a negative pressure in the supply line, the sealing ring may under certain circumstances not be able to provide a sufficient sealing function. This is a disadvantage.
Der Erfindung liegt die Aufgabe zu Grunde, eine neuartige Sicherungsarmatur mit verbesserter Dichtfunktion zu schaffen. Diese Aufgabe wird durch eine Sicherungsarmatur gemäß Anspruch 1 gelöst. Erfindungsgemäß umfasst der mit dem Verschlusskörper zusammenwirkende Dichtring eine weitere innere Dichtkontur, welche zumindest in der zweiten Position des Verschlusskörpers ebenfalls an der Außenkontur des Verschlusskörpers anliegt und bei einer negativen Druckdifferenz zwischen einem eingangseitigen Druck und einem ausgangseitigen Druck eine Dichtfunktion zwischen dem Dichtring und dem Verschlusskörper bereitstellt. Mit der hier vorliegenden Erfindung wird demnach vorgeschlagen, dass der Dichtring der Sicherungsarmatur zumindest zwei radial innere Dichtkonturen aufweist, wobei die weitere innere Dichtkonturen bei einer negativen Druckdifferenz zwischen dem eingangsseitigen und dem ausgangsseitigen Druck die Dichtfunktion bereitstellt. Dadurch kann insbesondere dann, wenn in der Zuleitung eines Rückflussverhinderers oder eines Systemtrenners ein Unterdruck auftritt, eine gute Dichtfunktion aufrechterhalten werden.The invention is based on the object to provide a novel safety valve with improved sealing function. This object is achieved by a safety fitting according to claim 1. According to the invention cooperating with the closure body sealing ring comprises a further inner sealing contour, which also abuts the outer contour of the closure body at least in the second position of the closure body and provides a sealing function between the sealing ring and the closure body at a negative pressure difference between an input-side pressure and an output-side pressure , With the present invention, it is therefore proposed that the sealing ring of the safety fitting has at least two radially inner sealing contours, the further inner sealing contours providing the sealing function with a negative pressure difference between the input-side and the output-side pressure. As a result, in particular when a negative pressure occurs in the supply line of a non-return valve or a system separator, a good sealing function can be maintained.
Nach einer Weiterbildung der Erfindung umfasst der Dichtring gegenüberliegend zu den beiden radial inneren Dichtkonturen jeweils einen radial äußeren Vorsprung, die jeweils an einer Ausnehmung zur Aufnahme des Dichtrings anliegen. Mit diesen kann die Dichtwirkung der Dichtkonturen eingestellt werden. Bevorzugte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung. Nachfolgend werden Ausführungsbeispiele der Erfindung, ohne hierauf beschränkt zu sein, anhand der Zeichnung näher erläutert. In der Zeichnung zeigt:
- Fig. 1
- einen Querschnitt durch eine als Systemtrenner ausgebildete erfindungsgemäße Sicherungsarmatur;
- Fig. 2
- das Detail X der Sicherungsarmatur der
Fig. 1 ; - Fig. 3
- den Dichtring der
Fig. 1 und2 in Alleindarstellung; - Fig. 4
- einen alternativen Dichtring; und
- Fig. 5
- einen weiteren alternativen Dichtring.
- Fig. 1
- a cross section through a trained as a system separator fuse according to the invention;
- Fig. 2
- the detail X of the safety valve of
Fig. 1 ; - Fig. 3
- the sealing ring of
Fig. 1 and2 in solo representation; - Fig. 4
- an alternative sealing ring; and
- Fig. 5
- another alternative sealing ring.
Die hier vorliegende Erfindung betrifft eine als Rückflussverhinderer oder als Systemtrenner ausgebildete Sicherungsarmatur. Der grundsätzliche Aufbau sowie die grundsätzliche Funktionsweise eines Rückflussverhinderers sowie Systemtrenners sind dem hier angesprochenen Fachmann geläufig und bedürfen keiner näheren Erläuterung.The present invention relates to a safety valve designed as a backflow preventer or as a system separator. The basic structure and the basic operation of a backflow preventer and system separator are familiar to the person skilled in the art and require no further explanation.
Hinsichtlich des grundsätzlichen Aufbaus und der grundsätzlichen Funktionsweise eines Rückflussverhinderers sei exemplarisch auf die
Im Gehäuse 11 ist ein Verschlusskörper 15 positioniert. Der Verschlusskörper 15 verbindet in einer ersten Position die Zuleitung 12 und die Ableitung 13 unter Versperrung des Ablasses 14. Diese erste Position des Verschlusskörpers 15 ist in
Im Verschlusskörper 15 ist ein eingangsseitiger Rückflussverhinderer 16 des Systemtrenners 10 aufgenommen. Ein ausgangseitiger Rückflussverhinderer 17 des Systemtrenners 10 ist in der Ableitung 13 bzw. im Ableitungsstutzen aufgenommen.In the
Mit dem Verschlusskörper 15 wirkt ein elastischer Dichtring 18 zusammen. Beim Systemtrenner 10 der
Der Dichtring 18 verfügt über eine innere bzw. radial innere Dichtkontur 21, welches vorzugsweise als Dichtlippe ausgebildet ist, wobei diese radial innere Dichtkontur 21 beim Systemtrenner 10 der
Um auch dann, wenn die Druckdifferenz zwischen dem eingangsseitigen Druck und dem ausgangsseitigen Druck negativ ist, eine ausreichende Dichtfunktion bereitzustellen, verfügt der Dichtring 18 zusätzlich zur inneren Dichtkontur 21 über eine weitere, innere Dichtkontur 22, welche ebenfalls vorzugsweise als Dichtlippe ausgebildet ist. Diese zusätzliche, innere Dichtkontur 22 liegt beim Systemtrenner 10 der
Zwischen diesen beiden radial inneren, vorzugsweise lippenartigen Dichtkonturen 21 und 22 des Dichtrings 18, die an einer radial inneren Kontur des Dichtrings 18 ausgebildet sind, ist die radial innere Kontur des Dichtrings 18 konkav, also in den Dichtring hinein, konturiert.Between these two radially inner, preferably lip-like sealing contours 21 and 22 of the sealing
Die vorzugsweise als Dichtlippe ausgebildete Dichtkontur 21 des Dichtrings 18, welche bei positiver Druckdifferenz zwischen dem eingangsseitigen Druck und dem ausgangsseitigen Druck die Dichtfunktion bereitstellt, ist an einem eingangsseitigen Abschnitt 23 des Dichtrings 18 radial innen ausgebildet. Die weitere, vorzugsweise als Dichtlippe ausgebildete Dichtkontur 22 des Dichtrings 18, welche bei einer negativen Druckdifferenz zwischen dem eingangsseitigen Druck und dem ausgangsseitigen Druck die Dichtfunktion bereitstellt, ist an einem ausgangsseitigen Abschnitt 24 des Dichtrings 18 radial innen ausgebildet.The preferably formed as a sealing lip sealing contour 21 of the sealing
Zusätzlich zu diesen beiden radial inneren, vorzugsweise als Dichtlippen ausgebildeten Dichtkonturen 21 und 22 verfügt der Dichtring 18 radial außen über äußere Vorsprünge 25 und 26. Diese Vorsprünge 25 und 26, die an der radial äußeren Kontur des Dichtrings 18 ausgebildet sind, liegen an der Ausnehmung 20, die an der Aufnahme des Dichtrings 18 dient, an.In addition to these two radially inner, preferably formed as sealing lips sealing contours 21 and 22, the sealing
In
Im Unterschied hierzu ist auch eine asymmetrische Konturierung des Dichtrings 18 möglich.In contrast, an asymmetrical contouring of the sealing
In
In
Im Unterschied hierzu ist es auch möglich, sowohl am eingangsseitigen Abschnitt 23 als auch am ausgangsseitigen Abschnitt 24 des Dichtrings 18 der jeweilige radial äußere Vorsprung 25 bzw. 26 und die jeweils gegenüberliegende, radial innere Dichtkontur 21 bzw. 22 ungleichartig konturiert sind.In contrast, it is also possible, both at the input-side portion 23 and at the output-side portion 24 of the sealing
Ferner können auch am eingangsseitigen Abschnitt 23 die jeweilige radial innere Dichtkontur 21 und der jeweilige radial äußere Vorsprung 25 ungleichartig konturiert sein, wohingegen am ausgangsseitigen Abschnitt 24 die jeweilige radial innere Dichtkontur 22 und der jeweilige radial äußere Vorsprung 26 gleichartig konturiert sein.Furthermore, the respective radially inner sealing contour 21 and the respective radially outer projection 25 may be contoured unevenly at the input-side portion 23, whereas the respective radially inner sealing contour 22 and the respective radially outer projection 26 may be similarly contoured on the output-side portion 24.
Über die radial äußeren Vorsprünge 25 und 26 kann die Anpressung der radial inneren, insbesondere lippenartigen Dichtkonturen 21, 22 des elastischen Dichtrings 18 an die Außenkontur 19 des Verschlusskörpers 15 und damit die Dichtwirkung eingestellt. Insbesondere sind hierüber Haftungskräfte zwischen den Dichtkonturen 21, 22 und dem Verschlusskörper 15 einstellbar, die bei einer druckdifferenzabhängigen Verlagerung des Verschlusskörpers 15 zu überwinden sind.About the radially outer projections 25 and 26, the contact pressure of the radially inner, in particular lip-like sealing contours 21, 22 of the
- 1010
- Sicherungsarmatur / SystemtrennerSafety fitting / system separator
- 1111
- Gehäusecasing
- 1212
- Zuleitungsupply
- 1313
- Ableitungderivation
- 1414
- Ablassdrainage
- 1515
- Verschlusskörperclosure body
- 1616
- eingangsseitiger Rückflussverhindererinput-side backflow preventer
- 1717
- ausgangsseitiger Rückflussverhindereroutput-side non-return valve
- 1818
- Dichtringseal
- 1919
- Außenkonturouter contour
- 2020
- Ausnehmungrecess
- 2121
- radial innere Dichtkonturradially inner sealing contour
- 2222
- radial innere Dichtkonturradially inner sealing contour
- 2323
- eingangsseitiger Abschnittinput-side section
- 2424
- ausgangsseitiger Abschnittoutput section
- 2525
- radial äußerer Vorsprungradially outer projection
- 2626
- radial äußerer Vorsprungradially outer projection
Claims (10)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010047377 DE102010047377A1 (en) | 2010-10-05 | 2010-10-05 | safety valve |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2439346A1 true EP2439346A1 (en) | 2012-04-11 |
EP2439346B1 EP2439346B1 (en) | 2015-12-30 |
Family
ID=44719469
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11182568.3A Active EP2439346B1 (en) | 2010-10-05 | 2011-09-23 | Safety fitting |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2439346B1 (en) |
DE (1) | DE102010047377A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1222750B (en) * | 1957-07-01 | 1966-08-11 | Renault | Valve for the automatic venting of compressed air systems |
EP0029387A1 (en) * | 1979-11-12 | 1981-05-27 | Anciens Etablissements M. FRISQUET, SA | Disconnector for potable-water conduit |
DE2751468C2 (en) | 1977-11-18 | 1984-06-28 | Honeywell-Braukmann GmbH, 6950 Mosbach | Backflow preventer |
US20040035467A1 (en) * | 2002-04-03 | 2004-02-26 | Willi Hecking | Valve assembly for pipe disconnectors |
WO2006027037A1 (en) * | 2004-09-10 | 2006-03-16 | Alfred Kärcher Gmbh & Co. Kg | Back flow preventor |
EP1801297A2 (en) | 2005-12-21 | 2007-06-27 | Honeywell Technologies Sarl ECC | Back flow preventer and assemblies with such back flow preventer |
-
2010
- 2010-10-05 DE DE201010047377 patent/DE102010047377A1/en not_active Withdrawn
-
2011
- 2011-09-23 EP EP11182568.3A patent/EP2439346B1/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1222750B (en) * | 1957-07-01 | 1966-08-11 | Renault | Valve for the automatic venting of compressed air systems |
DE2751468C2 (en) | 1977-11-18 | 1984-06-28 | Honeywell-Braukmann GmbH, 6950 Mosbach | Backflow preventer |
EP0029387A1 (en) * | 1979-11-12 | 1981-05-27 | Anciens Etablissements M. FRISQUET, SA | Disconnector for potable-water conduit |
US20040035467A1 (en) * | 2002-04-03 | 2004-02-26 | Willi Hecking | Valve assembly for pipe disconnectors |
WO2006027037A1 (en) * | 2004-09-10 | 2006-03-16 | Alfred Kärcher Gmbh & Co. Kg | Back flow preventor |
EP1801297A2 (en) | 2005-12-21 | 2007-06-27 | Honeywell Technologies Sarl ECC | Back flow preventer and assemblies with such back flow preventer |
Also Published As
Publication number | Publication date |
---|---|
DE102010047377A1 (en) | 2012-04-05 |
EP2439346B1 (en) | 2015-12-30 |
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