EP0353266B1 - Rückflussverhinderer, insbesondere zum einbau in trinkwasserleitungen - Google Patents

Rückflussverhinderer, insbesondere zum einbau in trinkwasserleitungen Download PDF

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Publication number
EP0353266B1
EP0353266B1 EP19890900218 EP89900218A EP0353266B1 EP 0353266 B1 EP0353266 B1 EP 0353266B1 EP 19890900218 EP19890900218 EP 19890900218 EP 89900218 A EP89900218 A EP 89900218A EP 0353266 B1 EP0353266 B1 EP 0353266B1
Authority
EP
European Patent Office
Prior art keywords
valve
valve body
drain valve
spring
drain
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.)
Expired - Lifetime
Application number
EP19890900218
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0353266A1 (de
Inventor
Walter Evers
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.)
Waletzko Armaturen GmbH
Original Assignee
Waletzko Armaturen GmbH
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.)
Filing date
Publication date
Application filed by Waletzko Armaturen GmbH filed Critical Waletzko Armaturen GmbH
Publication of EP0353266A1 publication Critical patent/EP0353266A1/de
Application granted granted Critical
Publication of EP0353266B1 publication Critical patent/EP0353266B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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, in particular intended for installation in drinking water pipes, with a flow-through housing formed with a feed 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 coaxially arranged valves, which communicate with the outside atmosphere
  • a drain valve which maintains a minimum differential pressure between the feed line and the middle chamber is to be connected, the valve body of which is connected to a control membrane, one side of which is in hydraulic connection with the feed line and the other side of which is in hydraulic connection with the middle chamber, the drain valve, its valve body and the Control diaphragm is outside the flow tube.
  • Backflow preventers of the above type are known from DE-A-29 30 819 and in a slightly modified manner, namely with a flow housing designed instead of a cylindrical tubular venturi nozzle, through US-A-25 03 424. They ensure that the liquid pressure in the middle chamber is always lower than the liquid pressure in the supply line, whereby a backflow of the liquid from the central chamber or discharge into the supply line is prevented even in the case of a defective or leak-prone supply valve.
  • the drain valve each having two valve seats, is provided with a single control membrane and with a valve spring or with a load weight, which seek to keep the valve body in its position lifted from its two valve seats, that is to say in the open position.
  • control membrane If the control membrane is damaged or leaky, contaminated water can still get from the central chamber into the supply chamber via the control membrane chamber. Even if the valve spring becomes damaged or breaks, the desired backflow prevention option is not achieved because the hydraulic pressure in the central chamber can then reach the same level as the hydraulic pressure in the inflow chamber without the drain valve then already opening.
  • the invention is therefore based on the object to provide a backflow preventer of the type in question, which does not have the aforementioned disadvantages, but rather offers an even greater security against any backflow.
  • this object is achieved in that two control membranes separated from one another by a space connected to the outside atmosphere are connected to the drain valve body, the control membrane facing the drain valve body being acted upon by the liquid pressure prevailing in the central chamber, whereas the other control membrane is affected by the liquid pressure prevailing in the feed line is acted upon and wherein the effective pressurizing cross section of the control diaphragm connected to the supply line is smaller by more than the cross-sectional dimension of the drain valve body piston than the effective pressurizing cross section of the other control diaphragm pressurized connected to the central chamber.
  • the presence of two control membranes with their space connected to the outside atmosphere ensures that in the event of defective or The one control membrane leaks the other control membrane still ensures a perfect separation of the inlet and intermediate chamber.
  • the inventive dimensioning of the different effective pressurization cross-sections of the two control membranes and the drain valve body piston ensures that the drain valve opens in any case even if the drain valve spring does not exist or breaks, before the hydraulic pressure in the middle chamber reaches or reaches that of the feed chamber comes close.
  • This shut-off and ventilation device is available in a non-generic pipe separator, where the drain valve body in question does not allow the middle chamber between the inlet and outlet valve to be connected to the outside atmosphere, but is installed in the supply line leading to the pressurization chamber of a piston valve-shaped inlet valve, depending on the situation after the water pressure in the discharge line, connect the above-mentioned pressurization chamber either to the liquid supply line or to the outside atmosphere, so that the inlet valve piston can return to its separation position which is relieved of the application pressure.
  • the two control membranes acting on the common drain valve body are here, on the one hand, under the liquid pressure prevailing in the supply line and, on the other hand, under the liquid pressure prevailing in the discharge line. In addition, both control membranes have the same area of application.
  • the drain valve has a single valve seat surface and its valve body is acted upon by a valve spring which tries to lift it off.
  • a single valve seat on the drain valve body teaches that the known backflow preventer existing drain valves with two valve seats each have the advantage of simple design and better sealing.
  • the presence of a special drain valve spring is advantageous because it enables the opening of the drain valve to be predetermined or achieved exactly when the hydraulic pressure difference between the inlet and middle chambers reaches a certain minimum value.
  • the illustrated backflow preventer consists essentially of the flow housing pipe 3, which is connected in a liquid-tight manner to a supply pipe socket 1 and a discharge pipe socket 2, in which a supply valve 4 and a drain valve 5 and a central chamber 6 present between the two valves are arranged to shut off the supply line 1 , which can be connected to the outside atmosphere via the drain valve generally designated 7.
  • a supply valve 4 and a drain valve 5 and a central chamber 6 present between the two valves are arranged to shut off the supply line 1 , which can be connected to the outside atmosphere via the drain valve generally designated 7.
  • the drain valve generally designated 7.
  • the inlet valve 4 has a valve body 8 which is axially displaceably mounted on an axially arranged guide tube 10 held in the flow-through housing tube 3 via connecting webs 9.
  • the comparatively large inlet valve spring 11 is accommodated, which seeks to press the valve body 8 with its seal 8 'bearing end face against the valve seat 1', which is formed by the recessed shoulder of the inlet tube or tube connection piece 1 projecting into the flow housing tube 3 becomes.
  • the drain valve 5 has a mushroom-shaped valve body 12, with its shaft 12 'in a guide bore 13 is guided axially displaceably, which is located in the housing web 14. Between the head 12 ⁇ of the valve body and the housing web 14, the drain valve spring 15 is supported, which is kept much weaker than the inlet valve spring 11.
  • the frustoconical valve head 12 'cooperates with the tapered valve seat surface 16', which is located in a plug-in sleeve 16 inserted into the flow housing tube 3 at the rear.
  • the valve seat surface 16 ' is provided with a correspondingly designed seal 17.
  • the drain valve 7 has a drain valve housing 18, which consists of three housing parts 18 ', 18 ⁇ , 18' '', which are firmly connected to each other via screws 19. Between the housing middle part 18 Gebirus and the housing end parts 18 'on the one hand and 18' '' on the other hand, a control membrane 20, 20 'is clamped firmly around the edge. Both membranes 20, 20 'are firmly connected to the piston-like valve body 25 via the disks 21, 22, 23 and the connecting screw 24. The between the two membranes 20, 20 'existing space 26 is connected via the ventilation openings 27 with the outside atmosphere.
  • the Ablrawventilkorper 25 is housed together with the surrounding drain valve spring 28 in the housing part 18 '''existing tube extension 18 IV axially displaceable.
  • This tube extension 18 IV is provided on the bottom side with a drain opening 29 leading into the open and with a lateral connecting piece 30 which is connected to the central chamber 6 via the line 31.
  • a seal 32 is provided in the tube extension 18 IV , on which the valve body 25 with its end face 25 'can sit.
  • the drain valve spring 28 is also supported on this seal 32 while it engages with its other end on rib-like projections 25 ⁇ of the valve body 25.
  • the lower diaphragm 20 'facing control chamber 33 is connected via line 31 to the middle chamber 6, while the other control diaphragm 20 adjacent control chamber 34 is connected via the pipe connection 35 to the connecting piece 1' '' of the feed line 1 ' .
  • the control chamber 34 is kept smaller in cross section than the control chamber 33, so that there is a smaller effective cross section for the control diaphragm 20 than for the control diaphragm 20 '.
  • the extent of the reduction in cross section corresponds to the cross section of the drain valve body piston 25.
  • valves 4, 5 get into their in the Drawing shown open position, since the water withdrawal causes a corresponding pressure drop not only in the discharge line 2 'but also after opening the drain valve 5 in the middle chamber 6, so that the pressure in the supply line 1' of, for example, 5 bar is designed to be, for example, 4 bar the inlet valve spring 11 overcomes.
  • the pressure in the central chamber 6 of, for example, 4 bar also prevails in the control chamber 33.
  • the relief valve spring 28 set for a pressure relief of, for example, 0.5 bar is therefore unable to lift the drain valve body 25 from its closed position into the open position.
  • the drain valve spring 28 can even be omitted because even then the desired minimum pressure difference between the central chamber 6 and the feed line 1' would be achieved .

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)
  • Safety Valves (AREA)
  • Fluid-Driven Valves (AREA)
EP19890900218 1987-12-12 1988-11-30 Rückflussverhinderer, insbesondere zum einbau in trinkwasserleitungen Expired - Lifetime EP0353266B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873742207 DE3742207A1 (de) 1987-12-12 1987-12-12 Rueckflussverhinderer, insbesondere zum einbau in trinkwasserleitungen
DE3742207 1987-12-12

Publications (2)

Publication Number Publication Date
EP0353266A1 EP0353266A1 (de) 1990-02-07
EP0353266B1 true EP0353266B1 (de) 1992-03-04

Family

ID=6342484

Family Applications (2)

Application Number Title Priority Date Filing Date
EP88119971A Pending EP0320700A1 (de) 1987-12-12 1988-11-30 Rückflussverhinderer, insbesondere zum Einbau in Trinkwasserleitungen
EP19890900218 Expired - Lifetime EP0353266B1 (de) 1987-12-12 1988-11-30 Rückflussverhinderer, insbesondere zum einbau in trinkwasserleitungen

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP88119971A Pending EP0320700A1 (de) 1987-12-12 1988-11-30 Rückflussverhinderer, insbesondere zum Einbau in Trinkwasserleitungen

Country Status (6)

Country Link
EP (2) EP0320700A1 (da)
DE (2) DE3742207A1 (da)
DK (1) DK396489A (da)
ES (1) ES2030596T3 (da)
FI (1) FI893642A0 (da)
WO (1) WO1989005382A1 (da)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4204386C2 (de) * 1992-02-14 1994-01-20 Honeywell Braukmann Gmbh Systemtrenner
DE4217334C2 (de) * 1992-05-26 1994-06-09 Heinrich W Kiesewetter Systemtrennungsarmatur
ES2178915B1 (es) 2000-03-07 2004-04-16 Plasticos Mondragon, S.A. Valvula hidraulica de membrana perfeccionada, para regulacion del caudal de fluidos.
CN102486237A (zh) * 2010-12-01 2012-06-06 刘永 内置过滤网和无须外置配管的倒流防止器
CN102322541B (zh) * 2011-09-02 2013-08-28 陈银周 低阻力倒流防止器

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2503424A (en) * 1945-01-15 1950-04-11 Leonard L Snyder Backflow preventer
US3083723A (en) * 1959-11-04 1963-04-02 Paul J Duchin Vacuum breaker
IL45802A (en) * 1973-10-26 1977-05-31 Griswold Controls Check valve useful in backflow prevention apparatus
DE2650934A1 (de) * 1976-11-08 1978-05-11 Waletzko Alfred Apparatebau Rueckflussverhinderer, insbesondere fuer rohrtrenner
DE2930819C2 (de) * 1979-07-30 1985-04-11 Amtrol Inc., West Warwick, R.I. Vorrichtung zur Verhinderung des Rückströmens von Wasser in einer Versorgungsleitung
DE3537484C1 (en) * 1985-10-22 1987-03-05 Baelz Juergen Controls Shut-off and aeration device, in particular for drinking-water systems

Also Published As

Publication number Publication date
EP0353266A1 (de) 1990-02-07
DK396489D0 (da) 1989-08-11
EP0320700A1 (de) 1989-06-21
WO1989005382A1 (fr) 1989-06-15
DE3742207A1 (de) 1989-06-22
FI893642A0 (fi) 1989-08-01
DE3868925D1 (de) 1992-04-09
DK396489A (da) 1989-08-11
ES2030596T3 (es) 1992-11-01

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