EP0452426A1 - Rückflussverhinderer, insbesondere zum einbau in trinkwasserleitungen. - Google Patents
Rückflussverhinderer, insbesondere zum einbau in trinkwasserleitungen.Info
- Publication number
- EP0452426A1 EP0452426A1 EP90910582A EP90910582A EP0452426A1 EP 0452426 A1 EP0452426 A1 EP 0452426A1 EP 90910582 A EP90910582 A EP 90910582A EP 90910582 A EP90910582 A EP 90910582A EP 0452426 A1 EP0452426 A1 EP 0452426A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- opening
- valve
- chamber
- central chamber
- drain valve
- 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
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 backflow preventer which is intended in particular for installation in drinking water pipes and which has a flow housing containing a supply and discharge line, a spring-loaded inlet valve accommodated therein and a spring-loaded outlet valve as well as a central chamber arranged between the two valves is provided, which is to be connected to the outside atmosphere via a release valve that opens when the pressure drops below a certain minimum differential pressure between the supply line and the middle chamber, the valve body of which is connected to a control element that can be acted upon on the one hand by the pressure in the supply line and on the other hand by the pressure prevailing in the middle chamber, and thereby by its discharge valve seat below Clear both a water outlet opening and an overlying ventilation opening leading to the middle chamber is to be lifted off.
- Backflow preventers of the above type are known, for example, from EU-A-0 084 754 and DE-C-28 54 003. They ensure that the liquid pressure prevailing in the middle chamber is always lower than the liquid pressure present in the feed line, which means that even if something is defective or a leaky inlet valve prevents a backflow of the liquid from the middle chamber or discharge into the feed line. In order to allow the liquid contained in the middle chamber to flow off better when the differential pressure-dependent drain valve is opened, not only a corresponding water outlet opening but at the same time a ventilation opening leading to the middle chamber is also exposed through the same valve body.
- the valve body is designed as a valve body tube installed vertically in the central chamber, the lower end of the water outlet opening leading directly from the central chamber into the outside atmosphere and the upper end of the second ventilation opening located between the middle chamber and the inside of the valve body tube controls the ventilation opening.
- the differential pressure-controlled discharge valve body also functions as a double-body valve, in which the lower end of the water outlet opening located between the middle chamber and the outside atmosphere and the upper end of the water outlet opening controls the ventilation opening between the middle chamber and the outside atmosphere.
- the double valve design of the drain valve requires considerable additional construction work. This also makes the sealing difficult.
- opening the water outlet opening on the one hand and the ventilation opening on the other hand and the ventilation opening on the other hand which is always the same and lasts the same time in the known generic check valves, is not advantageous because the associated comparatively frequent ventilation the middle chamber leads to the fact that this is more contaminated by contaminants introduced via the ventilation air.
- the invention is therefore based on the object of providing a backflow preventer of the type mentioned at the outset which, with regard to its drain valve which allows the central chamber to be connected to the outside atmosphere, has is more complex and ensures good drainage with improved ventilation of the middle chamber.
- this object is achieved according to the invention in that the water outlet opening of the drain valve and the ventilation opening are integrated into a single connection opening having a comparatively large cross-section between the middle chamber and the outside atmosphere, which through the valve body has to be exposed increasingly, depending on its opening stroke.
- Valve body either only liquid can flow out of the middle chamber or, in the case of a larger opening stroke, ventilation of the middle chamber also takes place. This makes it possible to avoid unnecessary ventilation of the middle chamber, which is associated with the introduction of contaminants, and yet its necessary ventilation can be achieved.
- the backflow preventer is provided with a tubular discharge valve housing flanged to the side of its flow housing at the level of its central chamber, each of which has the control element and its pressure chambers on both sides, a control rod with the piston-like seat at its lower end embodied valve body and the drain valve outlet opening surrounded by an annular valve seat, wherein directly above this valve seat in the valve housing wall a passage leading directly to the central chamber is provided, which passes through it during its opening stroke increasing valve body pistons increasingly is and which, together with the drain valve outlet opening located immediately below it, forms the integrated valve body-controlled connection opening.
- the passage opening leading to the middle chamber has a larger cross-section than the drain valve outlet opening located directly below it, and there is a wider area between the outer periphery of the piston-like valve body and the inner periphery of the outlet valve housing wall containing the middle chamber passage opening Annular gap present.
- the central chamber passage opening, the drain valve outlet opening and the annular gap surrounding the valve body form the common valve-controlled connection opening between the middle chamber and the drain valve outlet opening, the effective outlet or flow cross section of which increases as the valve body is dependent on the differential pressure Acting control element is lifted from the annular valve seat surrounding the discharge opening, that is to say depending on how far it is from the valve seat and raised past the central chamber passage opening.
- Fig.l is a vertical section through the fürflußge housing of the backflow preventer with attached to it, flanged, only dash-dotted drain valve housing
- Fig.2 shows a vertical section through the drain valve housing with additional, used for function test three-way solenoid valve
- Fig.3 the backflow preventer in the side view
- Figures 4,5 and 6 give a partial section along the line AB of Figure 2 with the drain valve body in a different position.
- the illustrated backflow preventer has a flow housing 1 designed according to FIG. 1, which is installed in a drinking water supply line via its supply line 2 and its discharge line 3.
- the supply valve 4 is accommodated, which consists of the supply valve body 6 loaded by the spring 5 and the annular valve seat surface 7 surrounding the supply line 2, against which the valve body 6 with its end sealing surface 6 'is pressed with considerable pressure .
- the drain valve 8 which consists of the drain valve body 10 acted upon by the weak spring 9 and the valve seat seal 12 provided in the housing installation part 11.
- the middle chamber 13 is present in the flow-through housing 1 between the inlet valve 4 and the outlet valve 8. This is connected via the relatively large cross-section through opening 14 to the lower interior 15 of the tubular drain valve housing 16 shown in FIGS. 2 and 3, which is directly on the side of the
- Part of the flow-through housing 1 containing the middle chamber is flanged, as shown in particular in FIG.
- the drain valve housing 16 is essentially tubular. It consists of several cylindrical parts with different diameters, placed one above the other and screwed together. In its upper part it contains the two rolling membranes 18 which are separated from one another by an intermediate space 17 and which form the control element here.
- the intermediate space 17 is connected to the outside atmosphere via the opening 19.
- the two rolling membranes 18 are fastened in the middle at the upper end of the control rod 20.
- the pressurizing chamber 21 arranged above the double membrane or rolling membranes is normally connected to the supply line 2, while the lower The application chamber 22 located half of the double membrane is in constant line connection via the through bore 23 and the lower valve housing space 15 and the large passage opening 14 with the central chamber 13, so that the lower rolling membrane 18 'is always acted upon by the liquid pressure prevailing in the central chamber 13 becomes.
- the lower roll membrane 18 ' is somewhat wider than the upper roll membrane 18. Its impact force is further supported by the control spring 24 arranged in the central region of the control rod 20, which on the one hand is attached to the disk attached to the control rod 20
- the piston-like valve body 28 is fastened. It has an annular seal 29, via which it normally rests in a sealing manner on the annular valve seat surface 30. Below the ring seal 29, a cylindrical part 31, which acts as a damping piston, is also attached to the valve body piston 28 and protrudes into the drain valve outlet opening 32 provided at the lower end of the housing wall 27. A comparatively wide annular gap 33 is present between the outer circumference of the valve body piston 28 and the valve housing wall 27. It ensures that the interior 15 of the drain valve housing 16 is always in sufficient fluid communication with the central chamber 13 connected via the comparatively large passage opening 14.
- a three-way solenoid valve 34 is provided on the valve housing 16, which can be operated either manually or by remote control.
- This valve 34 is arranged between the connecting line 35 branching off from the supply line 2 at the point 2 ′ and the line connection 21 ′ located above the upper loading chamber 21. It is also connected via line 36 to the drain valve outlet opening 32 located behind the valve seat 30.
- the three-way solenoid valve 34 By actuating the three-way solenoid valve 34, the upper supply Supply chamber 21 are separated from the connecting line 35 leading to the feed line 2 and are connected to the outside atmosphere via the line 36 and the outlet opening 32, as a result of which the valve body piston 28 is raised and thus the outlet opening 32 is opened.
- both openings 14, 32 are integrated into a single connecting opening between the central chamber 13 and the outside atmosphere, which has a comparatively large cross-section, and which is to be exposed continuously by the valve body 28 as a function of its opening stroke .
- 4 shows the closed position normally assumed by the drain valve, in which the valve body piston 28 rests on the valve seat ring surface 30, so that the central chamber 13 and also the interior 15 of the shut-off valve housing are sealed off from the outside.
- the shut-off valve body 28 assumes this position in the normal flow position of the non-return valve, that is, when its flow housing 1 is flowed through by the drinking water. If there is no water extraction behind the discharge line 3, the inlet valve 4 and the outlet valve 8 close.
- the relatively strong inlet valve spring 5 ensures that there is a certain minimum pressure difference between the inlet line 2 and the central chamber 13. This has the effect that the control membrane 18, 18 'remains in the position shown in FIG. 2 and the drain valve is kept closed. If, on the other hand, for whatever reason, there is a pressure increase in the V.
- valve body piston 28 is raised even further by the control membranes 18, 18 ', driving up past the passage opening 14 leading directly to the middle chamber 13 and thereby this opening is continuously exposed, whereby not only is the water drain from the central chamber 13 favored, but at the same time the same openings 14, 32 are used for ventilation.
- This case of completely opening the drain valve and thus effective ventilation of the middle chamber 13 can be brought about consciously by actuating the three-way solenoid valve 34, that is to say in connection with the functional test of the drain valve in this regard. In this way, the central chamber 13 can be completely emptied of water.
- a control piston which can be acted upon on both sides can also be used.
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)
- Check Valves (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT90910582T ATE83023T1 (de) | 1989-11-07 | 1990-07-20 | Rueckflussverhinderer, insbesondere zum einbau in trinkwasserleitungen. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3936962 | 1989-11-07 | ||
DE3936962A DE3936962A1 (de) | 1989-11-07 | 1989-11-07 | Rueckflussverhinderer, insbesondere zum einbau in trinkwasserleitungen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0452426A1 true EP0452426A1 (de) | 1991-10-23 |
EP0452426B1 EP0452426B1 (de) | 1992-12-02 |
Family
ID=6392991
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90910582A Expired - Lifetime EP0452426B1 (de) | 1989-11-07 | 1990-07-20 | Rückflussverhinderer, insbesondere zum einbau in trinkwasserleitungen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0452426B1 (de) |
DE (2) | DE3936962A1 (de) |
WO (1) | WO1991006716A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4409104B4 (de) * | 1993-03-20 | 2004-10-28 | Desch, Kurt Michael, Dipl.-Ing. (FH) | Hydraulisches Drei-Kammer-Systemtrenngerät |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH286217A (de) * | 1950-07-19 | 1952-10-15 | Benkiser Werk Kommandit Ges | Spülventil mit durch Gegendruckkammer gesteuertem Ventilkörper. |
IL45802A (en) * | 1973-10-26 | 1977-05-31 | Griswold Controls | Check valve useful in backflow prevention apparatus |
US4232704A (en) * | 1978-03-28 | 1980-11-11 | Amtrol Inc. | In line back flow preventer |
ATE15822T1 (de) * | 1982-01-26 | 1985-10-15 | Socla | Rueckflussverhinderer fuer druckleitungen. |
-
1989
- 1989-11-07 DE DE3936962A patent/DE3936962A1/de not_active Withdrawn
-
1990
- 1990-07-20 WO PCT/DE1990/000547 patent/WO1991006716A1/de active IP Right Grant
- 1990-07-20 DE DE9090910582T patent/DE59000553D1/de not_active Expired - Fee Related
- 1990-07-20 EP EP90910582A patent/EP0452426B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9106716A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE3936962A1 (de) | 1991-05-08 |
WO1991006716A1 (de) | 1991-05-16 |
EP0452426B1 (de) | 1992-12-02 |
DE59000553D1 (de) | 1993-01-14 |
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