EP0182004B1 - Dispositif pour protéger des conduites d'eau potable - Google Patents

Dispositif pour protéger des conduites d'eau potable Download PDF

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Publication number
EP0182004B1
EP0182004B1 EP85109012A EP85109012A EP0182004B1 EP 0182004 B1 EP0182004 B1 EP 0182004B1 EP 85109012 A EP85109012 A EP 85109012A EP 85109012 A EP85109012 A EP 85109012A EP 0182004 B1 EP0182004 B1 EP 0182004B1
Authority
EP
European Patent Office
Prior art keywords
valve
piston
water
servo
pressure
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
Application number
EP85109012A
Other languages
German (de)
English (en)
Other versions
EP0182004A3 (en
EP0182004A2 (fr
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 Te Gevelsberg Bondsrepubl GmbH
Original Assignee
Lang Apparatebau 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 Lang Apparatebau GmbH filed Critical Lang Apparatebau GmbH
Priority to AT85109012T priority Critical patent/ATE33278T1/de
Publication of EP0182004A2 publication Critical patent/EP0182004A2/fr
Publication of EP0182004A3 publication Critical patent/EP0182004A3/de
Application granted granted Critical
Publication of EP0182004B1 publication Critical patent/EP0182004B1/fr
Expired 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
    • E03C1/104—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
    • E03C1/02—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 device for protecting drinking water pipes leading to consumer points against returning domestic water, with a pipe separator installed in the drinking water pipe behind an inlet valve, which has a piston separating pipe which is axially displaceably guided in a cylinder provided with an inlet connector and which counteracts spring action when the inlet valve is open retracts into a discharge nozzle provided with a check valve and then flows through the water, on the other hand, when the inlet valve is closed, reaches its separation position away from the discharge nozzle, a pressure control cylinder containing a pressure control piston controlling the inlet valve being further provided, the working chambers of which are located on both sides of the pressure control piston via a working chamber with a Pilot valve provided pilot valve are to be connected alternately with the water supply line and a relief line, and the pilot piston on the one hand from the in the Water supply and on the other hand can be acted upon by the water pressure prevailing in the service water line.
  • the pilot piston which controls the pressure control piston of the supply valve also allows only small amounts of water to be drawn from the service water line without the switching vibrations of the piston separating tube being disruptive comes in the pipe separator. This is prevented by the fact that the pilot spool is more or less freely displaced by the water pressure that occurs in the service water line and is dependent on the water withdrawal, without bringing the pressure control spool out of its switching position holding the inlet valve in the open position, in which the working chamber facing away from the inlet valve in Pressure control cylinder is connected to the relief line.
  • the invention is based on the object of improving and perfecting a device of the type mentioned at the outset in such a way that even small amounts of water can be drawn with it without disruptive switching vibrations of the piston separating tube even in the case of strongly changing water supply pressures.
  • This object is achieved on the basis of a device of the type in question according to the invention in that a holding valve is connected upstream of the pilot valve on the service water line side, which is located in a bypass line running parallel to the outlet connection of the pipe separator and bridging its check valve and one of the flow water pressure occurring therein contains displacing valve piston, which in its displacement positions interrupts the connection between the pilot valve and the hot water pipe.
  • This holding valve located in the bypass to the non-return valve of the pipe separator ensures that, in the case of a correspondingly sensitive setting of its valve piston, the process water pressure at the pilot piston corresponding to the larger water withdrawals can also be maintained in the event of low and minimal water withdrawals, so that the pilot piston opens the inlet valve holding switch position remains safe due to the correspondingly large admission differential pressure and only reaches its switching position which brings the inlet valve into the closed position and thus also the piston separating pipe into the disconnected position when there is virtually no water withdrawal.
  • the holding valve with its valve piston lies in the bypass line to the check valve of the pipe separator, because on the one hand the holding valve responds accordingly sensitively and on the other hand the check valve can perform its backflow prevention function completely unaffected by opening only with larger water withdrawals, on the other hand, with little or no water withdrawal with sufficient closing force, lies sealingly on its valve seat.
  • a restoring spring acts on the valve piston of the holding valve and tries to keep it in the rest position against the flow water pressure, the valve piston blocking the bypass line in its area in front of the check valve in its rest position.
  • the return spring can be dimensioned relatively weak, so that even a low flow water pressure in the bypass line is sufficient to move the valve piston out of its idle position blocking the bypass line and thereby to block the connecting line between the pilot valve and the hot water line.
  • the device shown schematically in Fig. 1 for protecting drinking water pipes leading to consumer points against backflowing process water essentially consists of the inlet valve 2 built into the drinking water inlet pipe 1 with the associated pressure control cylinder 2 ', the pipe separator 3 connected downstream of the inlet valve 2, the pilot cylinder 4, and the between the latter and the service water pipe 5 located behind the pipe separator 3, the holding valve 6.
  • the latter is located in a bypass line 9 which is parallel to the outlet connection 7 of the pipe separator 3 and bridges its check valve 8.
  • the holding valve 6 is also connected via the pressure control line 10 with a built-in pressure gauge 11 connected to the one connection side of the pilot valve 4, the opposite end of which is connected to the drinking water supply line 1 via the line 12.
  • connection line 13 is present between the pressure control valve 4 and the pressure control cylinder 2 ', the connection line 15 between the latter and a pilot valve 14, and the T-shaped connection line 17 between the pressure control cylinder 2', the pilot valve 14 and the water flow area 16 located behind the inlet valve 2.
  • lines denoted by 18, 19 and 20 are so-called relief lines, which open into the open or into a process not shown in detail.
  • valve body 2 ′′ belonging to the inlet valve 2 is firmly connected via the piston rod 21 to the pressure control piston 22, which can be displaceably accommodated in the pressure control cylinder 2 ′.
  • a valve piston 14' is provided, which acts on is provided at its upper end with a piston membrane 14 "clamped all around in the valve housing and at its lower end with a sealing shoulder 14"'.
  • the compression spring 14' v accommodated in the pilot valve 14 tries to hold the piston 14 'in its upper switching position, in which the Piston shoulder 14 '"blocks the T-shaped connecting line 17 with respect to the relief line 19.
  • the piston 14 ' is displaced into its lower position by appropriate pressurization of the piston membrane 14 ", in which the line section 16 and also the lower working chamber 23' are connected to the relief line 19 via the T-shaped connecting line 17.
  • the pipe separator 3 shown in FIG. 3 is equipped in a known manner with a piston separating pipe 26 which is axially displaceably guided in the cylinder 25 provided with an inlet connection 24.
  • the piston separating tube 26 is supported on the shoulder 30 of the cylinder 25 via the compression spring 29.
  • valve body 8 ′′ which forms the actual check valve 8 and is pressed with its end face seal 8 ′′ by a comparatively strong compression spring (not shown) against the valve seat surface 81v in the outlet port 7.
  • a comparatively strong compression spring (not shown) against the valve seat surface 81v in the outlet port 7.
  • the pilot valve 4 shown in FIG. 4 has a valve housing 33 which is screwed together from a plurality of molded parts and which is penetrated by a continuous axial bore 34, in which the pilot piston 35 is axially displaceably mounted to a limited extent.
  • the piston 35 is provided at both ends with piston flanges 36, 37, which are covered on the outside by piston membranes 38 and 39, the outer circumferences of which are housed and clamped in the pressurizing chambers 40 and 41 of the pilot valve 4, which are of correspondingly large diameter.
  • the compression spring 42 is accommodated, which acts on the control piston 35 as well as the process water line pressure present via the connecting line 10.
  • the left working chamber 40 is connected to the drinking water supply line 1 via the opening line 12.
  • the respective inner working chambers 40 'and 41' are connected to the outside atmosphere via ventilation bores 43, 43 ', the bores 43' furthermore ensuring that even if the piston membrane 39 is damaged, there is no process water from the line 10 into the central section of the axial bore 34 can reach, so no otherwise possible contamination of the supply water can take place.
  • the pilot piston 35 is also provided at its end facing the feed line 12 with its axial bore 35 ′ and a transverse bore 35 ′′ attached to it, which is in the flow position of the pilot piston 35 shown in FIG. 4 at the level of the bore extension 34 ′′ in the valve housing 33. Furthermore, the connections 13 'and 18' for the line 13 leading to the pressure control cylinder 2 'and to the relief line 18 are provided in the valve housing 33. Two ring seals 35 "'are provided on the pilot piston 35 at a corresponding distance from one another and the ring seals 44 are provided in the valve housing in the region of the working chambers 40', 41 '.
  • the holding valve shown in FIG. 5 has a valve housing consisting of the two cylindrical parts 45, 46 screwed together, which is penetrated by a continuous axial bore 47 in which the valve piston 48 is axially displaceably mounted.
  • the storage takes place via the ends 48 'and 48 "which are tapered in diameter in the correspondingly narrowed end regions 47' and 47", respectively.
  • the continuous axial bore 47 which is connected or incorporated into a bypass line 9 via its lower and upper connection 47 ′′ or 47 11.
  • the line 10 leading to the pilot valve opens into the area 47 v of the axial bore 47, namely via the perforated stop sleeve 50, which is sealed on both sides by sealing rings 49, which is held by the sleeve 51 located above and the nut 52 screwed to the upper housing part 45 via its external thread.
  • the central part of the valve piston 48 is provided with a shoulder 48 "'provided that carries a slightly projecting, flexible flow flange 53 and at the same time serves to support the compression spring. This strives to press the valve piston 48 with its shoulder 48 "', which carries the sealing ring 55, against the valve seat surface 46' provided on the lower valve housing part 46.
  • the shoulder 48"'and the flexible flow flange 53 are held in diameter in such a way that in the process water line 5 recognized in forming the water extraction in the bypass line 9 can flow past water located at the Strömungsflansch 53 to be able to then existing in the piston 48 and the transverse bore 481v axial bore 48 continue to flow v.
  • the compression spring 54 is preloaded accordingly, depending on the prevailing flow water pressure, the tubular part 48 ′ of the valve piston 48 blocking the inlet 47 to the pilot line 10, as shown in FIG. 5.
  • the inlet valve 2 and its pressure control piston 22 as well as the piston separating pipe 26 and the check valve 8 in the pipe separator 3 assume the closing or separating position shown in FIGS. 2 and 3.
  • the valve piston 48 of the holding valve 6 rests with its shoulder 48 ′′ or the sealing ring 55 present thereon on the valve seat 46 ′, as a result of which the service water line part 5 faces not only via the check valve 8 in the closed position but also via the bypass line 9 of the separation point 32.
  • valve piston 48 Since in this locked position the valve piston 48 has connected with its tubular end portion 48 v the connecting line 10 to the bypass line 9 and thus the water pressure prevailing in the service water line 5 together with the compression spring 42 present in the pilot valve 4 4, the pressure control line 12 is connected via the bores 35 'and 35 "and via the bore extension 34" to the line 13' leading to the upper working chamber 23, whereby the pressure control piston 22 in 2 in the position shown also the piston 14 'present in the pilot valve 14 is pressed into the lower switching position shown in FIG. 2, in which both the pipe section 16 and the lower working chamber 23' in the pressure control cylinder 2 'are connected to the relief line 19 via the T-shaped line 17 stand.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Safety Valves (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Devices For Dispensing Beverages (AREA)

Claims (5)

1. Dispositif destiné à protéger des conduites d'eau potable (1) menant à des points de consommation, contre le reflux des eaux usées, ce dispositif comprenant un interrupteur de canalisation (3) intercalé dans la conduite d'eau potable en aval dune soupape d'arrivée (2) et présentant un tube d'interrupteur à piston (26), qui est guidé mobile en translation axiale dans un cylindre muni d'une tubulure d'arrivée et qui, lorsque la soupape d'arrivée (2) est ouverte, s'enfonce à l'encontre de l'action d'un ressort dans une tubulure de départ (7) munie d'un clapet anti-retour (8) et est alors parcouru par l'eau tandis que, lorsque la soupape d'arrivée (2) est fermée, ce tube d'interrupteur passe à sa position d'interruption éloignée de la tubulure de départ (7), le dispositif (2') renfermant un piston de commande à pression (22) qui commande la soupape d'arrivée (2), cylindre dont les chambres de travail, situées de part et d'autre du piston de commande à pression (22), sont destinées à être raccordées alternativement à la conduite d'arrivée d'eau et à une conduite de décharge, à travers une soupape pilote (4) munie d'un piston pilote (35), et le piston pilote (35) pouvant être chargé, d'un côté, par la pression d'eau qui règne dans la conduite d'arrivée d'eau et, de l'autre côté, par la pression d'eau qui règne dans la conduite des eaux usées, caractérisé en ce qu'il est prévu, en amont de la soupape pilote (4), du côté de la conduite des eaux usées, une soupape de retenue (6) qui est montée dans une conduite de dérivation (9) branchée en parallèle sur la tubulure de départ (7) de l'interrupteur de canalisation (3) et contournant le clapet anti-retour (8) de ce dernier, et qui renferme un piston obturateur (48) qui se déplace sous l'action de la pression d'eau dynamique apparaissant dans cette conduite, et qui, dans ses positions de translation, interrompt la communication (10) entre la soupape pilote (4) et la conduite des eaux usées (5).
2. Dispositif selon la revendication 1, caractérisé en ce que le piston obturateur 648) de la soupape de retenue (6) est attaqué par un ressort de rappel (54) qui tend à le maintenir en position de repos à l'encontre de la pression d'eau dynamique et en ce que, dans sa position de repos, le piston obturateur (48) ferme la conduite de dérivation (9) dans sa région située en amont du clapet anti-retour (8).
3. Dispositif selon la revendication 2, caractérisé en ce que la soupape de retenue (6) comprend un boîtier de soupape (45, 46) présentant un perçage axial (47) qui la traverse axialement, est rétréci à ses deux extrémités de façon étagées et fait partie de la conduite de dérivation (9), ainsi qu'un perçage transversal (47v) menant à la soupape pilote (4) et débouchant dans le tronçon de perçage axial (47' ) dirigé vers le tronçon de conduite de dérivation qui débouche en aval du clapet anti-retour (8), cependant que le piston obturateur (48) est monté pour coulisser dans les deux sens dans le perçage axial (47), est muni dans sa région médiane d'un épaulement attaqué par le courant (48"' ), qui donne appui au ressort de rappel (54) entourant cette région médiane, et est d'une configuration tubulaire à son extrémité dirigée vers le raccord de perçage transversal (47v), et permet de fermer ou de libérer le raccord de perçage transversal en agissant à la façon d'un tiroir.
4. Dispositif selon la revendication 3, caractérisé en ce que le piston obturateur (48) de la soupape de retenue (6) est muni, sur son épaulement annulaire (48"') dirigé vers le trançon rétréci (47") du côté de l'arrivée, d'une garniture d'étanchéité annulaire (55) qui s'appuie sur l'épaulement (46' ) du perçage du boîtier (46) de la soupape dans la position de repos du piston obturateur.
5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que la soupape pilote (4) possède un boîtier de soupape (33) qui est muni d'un perçage (34) qui le traverse axialement, et d'un piston pilote (35) disposé dans ce perçage et le traversant, boîtier qui présente deux chambres de charge (40, 41) situées à hauteur des extrémités du piston pilote (35) et qui renferment chacune une membrane de piston (38, 39) qui y est logée, dont une (38) peut être soumise à la pression de la conduite d'arrivée d'eau et dont l'autre (39) peut être soumise à la pression des eaux usées, cependant que, entre le raccord du boîtier de soupape du côté de la conduite des eaux usées et l'extrémité du piston pilote qui est dirigée vers ce raccord, est disposé un ressort de compression (42) qui charge cette extrémité, et qu'entre les deux chambres de charge (40, 41) contenues dans le boîtier de soupape pilote (33), sont disposés le raccord de conduite (13') qui mène au cylindre de commande à pression (2') et le raccord de conduite de décharge (18' ), décalé axialement par rapport à celui-ci, ces raccords devant être commandés de façon appropriée par le piston pilote (35) qui est muni de perçages de soupape correspondants (35', 35") et de garnitures d'étanchéité annulaires correspondantes (35"').
EP85109012A 1984-11-23 1985-07-19 Dispositif pour protéger des conduites d'eau potable Expired EP0182004B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85109012T ATE33278T1 (de) 1984-11-23 1985-07-19 Vorrichtung zum schutz von trinkwasserleitungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843442748 DE3442748A1 (de) 1984-11-23 1984-11-23 Vorrichtung zum schutz von trinkwasserleitungen
DE3442748 1984-11-23

Publications (3)

Publication Number Publication Date
EP0182004A2 EP0182004A2 (fr) 1986-05-28
EP0182004A3 EP0182004A3 (en) 1986-12-17
EP0182004B1 true EP0182004B1 (fr) 1988-03-30

Family

ID=6250983

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85109012A Expired EP0182004B1 (fr) 1984-11-23 1985-07-19 Dispositif pour protéger des conduites d'eau potable

Country Status (3)

Country Link
EP (1) EP0182004B1 (fr)
AT (1) ATE33278T1 (fr)
DE (2) DE3442748A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3520250A1 (de) * 1985-06-05 1986-12-11 Grünbeck Wasseraufbereitung GmbH, 8884 Höchstädt Rohrtrenner
DE3626825A1 (de) * 1986-08-08 1988-02-18 Gruenbeck Josef Wasseraufb Rohrtrennung mit einer sperreinrichtung und eine ueberwachungseinrichtung fuer die sperreinrichtung
DE3703715A1 (de) * 1987-02-06 1988-08-18 Schubert & Salzer Maschinen Vorsteuerventil fuer einen ueber eine antriebskammer steuerbaren rohrtrenner
DE3762532D1 (de) * 1987-08-31 1990-06-07 Honeywell Braukmann Gmbh Trinkwasser-durchflussarmatur.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3276465A (en) * 1963-01-18 1966-10-04 Donald G Griswold Backflow prevention device and relief valve control
DE2806310C2 (de) * 1978-02-15 1986-08-21 Lang Apparatebau GmbH, 8227 Siegsdorf Vorrichtung zum Schutz von Trinkwasserleitungen gegen rückfließendes Brauchwasser
DE2849825C2 (de) * 1978-11-17 1984-05-10 Lang Apparatebau GmbH, 8227 Siegsdorf Trinkwasser-Durchflußarmatur mit in eine Trinkwasserversorgungsleitung eingebautem Durchflußwächter

Also Published As

Publication number Publication date
ATE33278T1 (de) 1988-04-15
EP0182004A3 (en) 1986-12-17
DE3562030D1 (en) 1988-05-05
DE3442748A1 (de) 1986-05-28
EP0182004A2 (fr) 1986-05-28

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