EP0341595B1 - Dispositif de commande pour une vanne d'aspiration actionnée par dépression d'une conduite sous vide, particulièrement pour eaux d'égouts - Google Patents

Dispositif de commande pour une vanne d'aspiration actionnée par dépression d'une conduite sous vide, particulièrement pour eaux d'égouts Download PDF

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Publication number
EP0341595B1
EP0341595B1 EP89108124A EP89108124A EP0341595B1 EP 0341595 B1 EP0341595 B1 EP 0341595B1 EP 89108124 A EP89108124 A EP 89108124A EP 89108124 A EP89108124 A EP 89108124A EP 0341595 B1 EP0341595 B1 EP 0341595B1
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EP
European Patent Office
Prior art keywords
valve
control
line
vacuum
vacuum line
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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
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EP89108124A
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German (de)
English (en)
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EP0341595A1 (fr
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Harald Michael
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Individual
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Individual
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    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F1/00—Methods, systems, or installations for draining-off sewage or storm water
    • E03F1/006—Pneumatic sewage disposal systems; accessories specially adapted therefore

Definitions

  • the invention relates to a control device for a suction valve which can be actuated by negative pressure on a vacuum line for waste water and other liquids to be sucked out of a ventilated cavity, with a direct or indirect arrangement on a control line between an actuating cylinder of the suction valve and a connection point of the vacuum line in the flow direction behind the suction valve manually or automatically operated control valve and with a timing device in the form of a preloaded pneumatic control cylinder with throttle opening for controlling the closing movement of the suction valve following a closing operation of the control valve triggered by pressure increase in the control line after the liquid has been sucked off.
  • Such control devices are e.g. in GB-A-2149534, DE-OS-2455551 and EP-A-216101.
  • a suction valve of the type in question here shows DE-PS-1609245.
  • the known control devices consist of a large number of control valves, which are upstream and downstream of the time control device.
  • this includes an upstream activator valve which opens depending on the liquid level and, since this changes only relatively slowly, often gives rise to faults.
  • the reliability of the operation should actually be ensured by the numerous components of the known control devices.
  • the large number of valves and actuating cylinders connected in series, each with moving parts, leads to the risk of leaks and a high risk of errors.
  • One or more suction valves on the vacuum line must normally be kept tightly closed so that the system vacuum is not lost. Only if a certain amount of wastewater has collected in the ventilated cavity of a vacuum toilet, a wastewater tank on a railroad car or boat or in another container, is the suction valve opened automatically or by manual actuation in order to draw off the wastewater volume from the container. This should be a ventilated cavity so that a certain amount of air can be sucked into the vacuum line after the wastewater has been completely sucked off. This volume of air is used for the wastewater transport in the vacuum line in order to convey the wastewater at least over a certain distance in the vacuum line, after which it is then can be transported further, for example, by air let into the vacuum line at another point.
  • the last-mentioned function differentiates the control device mentioned at the outset from those in which, for example in accordance with GB-PS-1525589, the closing of the suction valve is triggered by a float before the liquid is sucked off to such an extent that air can penetrate into the vacuum line.
  • the invention has for its object to provide a control device of the type mentioned, which is much simpler in construction and therefore much less prone to failure than the known control devices, and this object is achieved in that the control valve on the one hand directly to the Vacuum line, on the other hand, is directly connected to the actuating cylinder of the suction valve and to the control cylinder of the time control device, so that when the control valve is open, the vacuum line at the connection point is acted upon, the control valve having a pneumatic self-holding device activated when opening and connected to the control cylinder is provided with a resetting element, by means of which the control valve can be switched back to the closed position at a certain upper limit value of the absolute pressure in the control cylinder, while the timing control device the Ab suction valve remains open for a certain period of time.
  • the new control device thus manages with a single control valve with a self-holding device and a time control device which, in a preferred practical embodiment of the invention, does not require any additional components by simultaneously using the actuating cylinder of the suction valve as the control cylinder of the time control device. Surprisingly, it does no harm, but is advantageous that the throttle opening is then on the actuating cylinder of the suction valve. The air sucked in above when the suction valve is open flows through the control valve into the vacuum line and thereby prevents wastewater from reaching the control valve from there.
  • the self-holding device of the control valve consists of a membrane connected to its valve piston, which delimits a valve chamber which is constantly subjected to the negative pressure at the connection point of the vacuum line and in the open position of the control valve with the actuating cylinder of the suction valve in connection stands.
  • the piston of the actuating cylinder of the suction valve is a membrane piston in a known manner, these two membranes form the only movable parts of the control device which are exposed to the outside atmosphere, so that the latter remains permanently sealed with great reliability.
  • Another advantage of the last-mentioned preferred embodiment is that the membrane, which belongs to the self-holding device of the control valve, can simultaneously serve as an actuation button for opening the control valve and thus combines two functions.
  • valve chamber is connected to the actuating cylinder of the suction valve via the bore receiving the valve piston and the valve seat.
  • the return members for the piston of the suction valve and the valve piston of the control valve are preferably springs acting in the direction of the piston. Since the return spring of the control valve must not be chosen too strong and pressure fluctuations in the vacuum line must be expected, it is provided in a further preferred embodiment of the invention that the open position of the control valve by a relatively flat and the closed position by a relatively deep radial recess or annular groove in the valve piston are determined, in which one or more spring-loaded balls can be locked radially, the area of the valve piston between the two recesses or annular grooves being an inclined surface.
  • the actuation button of a pressure washer which is known per se, is to be actuated simultaneously with the opening of the suction valve, this can be done in a simple manner e.g. in that a plunger connected to the actuating piston of the suction valve travels over a membrane sealing the actuating cylinder during the opening movement of the suction valve against the actuating button of the pressure washer.
  • the actuating button of the flush valve on the membrane of the control valve, so that the same actuation movement acts on the one hand on the control valve and on the other hand on the flush valve.
  • the main parts of the device shown in FIG. 1 consist of a suction valve 10 which can be actuated by negative pressure with associated control device 11 on a vacuum line 14.
  • the suction valve 10 is temporarily detachably connected on the side labeled B to a wastewater collection container of a railroad car in order to suck out 1 m3 of wastewater within about 1-2 minutes via the vacuum line 14.
  • the side of the suction valve labeled A is connected to a vacuum line network which is under negative pressure.
  • the suction process is initiated by pressure on a membrane 1 of the control device 11.
  • the membrane 1 can be pressed either manually or by a coupling member of the line coupling.
  • valve seal designated 3 is lifted from the valve seat by means of a valve piston 2 connected to it, and the vacuum of the vacuum line 14 at a connection point 16 in the flow direction behind the suction valve 10 passes via a control line 15 and this arranged, consisting of a single control valve control device 11 in the actuating cylinder 9 of the suction valve 10.
  • a line connection is opened between a valve chamber 4 delimited by the membrane 1, which is constantly through the control line 15 is connected to the connection point 16 on the vacuum line 14, and the part of the control line 15 leading from the control valve 11 to the actuating cylinder 9 of the suction valve 10, this line connection including the valve bore in which the valve, which is smaller in cross-section or has longitudinal grooves, is provided piston 2 is guided and which extends from the valve chamber 4 to the seat of the valve seal 3.
  • the actuating cylinder 9 of the suction valve 10 As soon as the actuating cylinder 9 of the suction valve 10 is subjected to negative pressure via the opened control valve 11, it pulls through a flexible sleeve 12 as a membrane piston Trained actuating piston of the suction valve 10, the valve member, not shown, shutting off the vacuum line 14, which preferably also has the shape of a membrane, against the action of a return spring 12 'upwards into the open valve position.
  • a special feature of the self-holding and resetting device of the control valve 11 is that in addition to the resetting spring 5, one or more ball catches act on the valve piston 2 thereof. These each consist of a ball 8 guided in a radial bore and pressed radially against the valve piston 2 by means of a spring. The spring loading of the ball 8 can be adjusted by means of an adjusting screw 7.
  • the valve piston 2 is in the middle region, where the balls 8 are pressed against it, with a relatively flat and axially short annular groove 20 and with a relatively deep, axially wider annular groove 22 and with a conical inclined surface 24 formed between the two ring grooves 20 and 22.
  • the position of the annular grooves with respect to the radial bores receiving the balls 8 is selected so that the balls 8 are in engagement with the flat annular groove 20 when the control valve 11 is open and in engagement with the deeper annular groove 22 when the control valve 11 is closed. In these two end positions, the ball catch does not exert any axial force on the valve piston 2.
  • the suction valve 10 remains open continuously during the entire suction process and also thereafter for a certain period of time.
  • the air sucked into the vacuum line 14 after the waste water not only has a transport function, but also serves to clean the suction valve.
  • a plunger 18 is attached to the actuating piston of the suction valve 10, which, during the opening movement of the suction valve via an actuating cylinder 9 that seals it outwards, presses the actuating button 19 'of a flush valve 19, whereby the water inflow of C after D to the pool of the vacuum toilet is opened.
  • the flush valve 19 of conventional design is expediently set so that water can continue to run into the vacuum toilet after the suction valve 10 has been closed, so that there is again some water even after the suction process. With vacuum toilets only about one liter is sucked off.
  • the vacuum then immediately breaks down at the connection point 16 of the vacuum line 14, and then the same process takes place as described above.
  • the water flowing in via the flush valve 19 when the suction valve 10 is open does not prevent the breakdown of the vacuum at the connection point 16 and the consequent closing of the control valve 11 and then the suction valve 10 after the suction process.
  • an arrangement consisting of two control devices of the type described above and each associated suction valves which can be actuated by negative pressure and which can be coupled in series.
  • One of the two suction valves forms the closure at the outer end of the suction line connected to the waste water tank. arranged on an outer wall of a vehicle.
  • This vehicle-side suction valve also remains closed while the suction valve arranged at the end of the vacuum line is coupled, the latter also initially being in the closed state.
  • wastewater cannot flow out before and during the coupling of the vacuum line to the suction line of the tank.
  • This is achieved according to the invention in that the coupling process takes place while the outer end of the suction line of the tank is still sealed off by the suction valve arranged there.
  • the two series-connected suction valves are opened simultaneously or one after the other by means of their respective control valves, whereupon the waste water tank is sucked empty.
  • the control valves of both suction valves are preferably arranged directly next to one another and can be actuated simultaneously by a common actuating element.
  • the vehicle-side suction valve it is expedient to let the two suction valves close one after the other after the waste water has been sucked out of the tank, firstly the vehicle-side suction valve.
  • This can be achieved, for example, in that in the control line between the connection point to the vacuum line and the control valve, which is assigned to the suction valve located at the rear in the flow direction, ie on the side of the vacuum line. a choke point is present. This delays the pressure increase in the control valve of the last-mentioned suction valve after the empty suction of the waste water tank, so that the vehicle-side suction valve closes earlier.
  • the return spring in the control valve of the vehicle-side suction valve could also be stronger than in the control valve belonging to the suction valve on the side of the vacuum line.
  • control line is between the front, i.e. vehicle-side suction valve and the associated control valve divided into two separable sections, which can be coupled together with the two suction valves.
  • the further shown suction valve 10 is, as described above, on a e.g. tubular end of a vacuum line 14 attached.
  • both suction valves 10 'and 10 are in the closed state, so that on the one hand no waste water can flow out of the tank and on the other hand no vacuum loss occurs on the vacuum line.
  • connection openings of the suction valves 10 'and 10 can be coupled with a conventional pipe coupling, which is indicated at 14 ⁇ , without the risk that before or during this coupling process waste water from the suction line 14 'leaks. It is also irrelevant in this context whether the line connection with coupling 14 ⁇ between the two suction valves 10 'and 10 is significantly longer than shown in the drawing.
  • the suction valve 10 is assigned a control valve 11 and the suction valve 10 'another control valve 11'. Both control valves 11 and 11 'are attached directly next to each other at the end of the vacuum line 14 in the example. There is therefore no need for a control valve on the vehicles.
  • By arranging the control valve 11 'assigned to the vehicle-side suction valve 10' on the side of the vacuum line one saves the control valves which would otherwise have to be attached to the large number of vehicles.
  • a common connection point 16 to the vacuum line 14 is provided for both control valves 11 and 11 '. It is understood that the control valves could also have separate connections to the vacuum line. In both cases, however, it is expedient to provide a throttle point 16 'only in the control line, which connects the vacuum line 14 with the control valve 11 for the suction valve 10 on the side of the vacuum line. As a result, the pressure rise occurring after the empty suction of a tank in the vacuum line 14 is passed faster to the control valve 11 'than to the control valve 11, so that the vehicle-side suction valve 10' closes rather than the one arranged downstream in the flow direction Suction valve 10.
  • a common actuating plate 11' is attached in the exemplary embodiment above two control valves 11 and 11 'arranged next to one another, so that both control valves and thus both with a single pressure on this plate Suction valves can be switched to the open position.
  • the vacuum line must be shut off with another shut-off device, for example a ball valve, which, however, can be simpler in structure than the described suction valve with associated control valve.
  • a vehicle-side suction valve 10 ' is coupled with a further suction valve 10 attached to the end of the vacuum line or simply with an end piece of a vacuum line that can be shut off in another way
  • the tubular coupling parts shown in FIG. 5 are recommended Arrangement. It is characterized in that the rear tubular coupling part 26, which in the example represents the inlet side of the suction valve 10 attached to the vacuum line, engages in the other tubular coupling part 28 with radial play and engages close to the shut-off element of the vehicle-side suction valve 10 'Extends.
  • the coupling is sealed e.g. by an O-ring 30 axially compressed between the two coupling parts 26 and 28.
  • a concentric outer cladding tube 34 is attached on the side of the coupling part 28, to which e.g. Eccentric bolts 36 can be mounted, which engage in a corresponding annular groove 38 in the tubular coupling part 28.

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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)
  • Sanitary Device For Flush Toilet (AREA)
  • Fluid-Driven Valves (AREA)

Claims (13)

1. Dispositif de commande d'une vanne d'aspiration (10) actionnée par dépression d'une conduite sous vide (14) pour les eaux usées (eaux d'égouts) et autres liquides aspirés d'une cavité ventilée, avec une vanne de commande (11) actionnée directement ou indirectement, manuellement ou automatiquement, prévue sur une conduite de commande (15) entre un vérin d'actionnement (9) de la vanne d'aspiration (10) et un point de branchement (16) de la conduite sous vide (14) en aval de la vanne d'aspiration (10), et un dispositif de commande temporisé sous la forme d'un vérin d'actionnement (9) pneumatique, précontraint, comportant un orifice d'étranglement (13) pour commander le mouvement de fermeture de la vanne d'aspiration (10) en liaison avec une opération de fermeture de la vanne de commande (11) déclenchée par une montée en pression dans la conduite de commande (15) après l'aspiration du liquide, dispositif caractérisé en ce que la vanne de commande (11) est reliée d'une part, directement à la conduite sous vide (14) et d'autre part, directement au vérin d'actionnement (9) de la vanne d'aspiration (10) et au vérin d'actionnement (9) du dispositif de commande temporisé (9, 13) de manière que lorsque la vanne de commande (11) est ouverte, ceux-ci soient sollicités par la dépression dans la conduite sous vide (14) au point de raccordement (16), et la vanne de commande (11) est munie d'un dispositif de retenue automatique (1, 4) activé à l'ouverture et relié pneumatiquement au vérin d'actionnement (9) muni d'un organe de rappel (5), qui remet la vanne de commande (11) pour une certaine valeur limite supérieure de la pression absolue dans le vérin d'actionnement (9), en position de fermeture, pendant que le dispositif de commande temporisé (9, 13) maintient encore ouverte la vanne d'aspiration (10) pendant un temps prédéterminé.
2. Dispositif de commande selon la revendication 1, caractérisé en ce que le vérin d'actionnement (9) de la vanne d'aspiration (10) constitue en même temps le vérin d'actionnement du dispositif de commande temporisé (9, 13).
3. Dispositif de commande selon la revendication 1 ou 2, caractérisé en ce que le dispositif de retenue automatique de la vanne de commande (11) se compose d'une membrane (1) reliée à son piston de vanne (2), membrane qui délimite une chambre de vanne (4) sollicitée en permanence par la dépression au point de branchement (16) de la conduite sous vide (14) et qui en position d'ouverture de la vanne de commande (11) communique avec le vérin d'actionnement (9) de la vanne d'aspiration (10).
4. Dispositif de commande selon la revendication 3, caractérisé en ce que la position ouverte de la vanne de commande (11) est définie par une cavité ou rainure annulaire (20, 22) relativement plate du piston de vanne (2) et la position fermée par une cavité ou rainure radiale relativement profonde du piston (2), dans laquelle s'engagent radialement, une ou plusieurs billes (8) chargées par ressort, la zone du piston de vanne (2) entre les deux cavités ou rainure annulaire (20, 22) étant une surface inclinée (24).
5. Dispositif de commande selon l'une des revendications précédentes, caractérisé en ce que le mouvement du piston de manoeuvre de la vanne d'aspiration (10) ou simultanément la mise en main de la vanne de commande (11) actionne un dispositif de nettoyage sous pression (19) d'une toilette sous vide.
6. Dispositif pour aspirer des liquides tels que les eaux usées par une conduite d'aspiration à partir d'un réservoir ventilé à l'aide d'une conduite sous vide susceptible d'être reliée à la conduite d'aspiration, notamment avec un dispositif de commande selon l'une des revendications 1 à 5, caractérisé en ce qu'aux extrémités directement couplées de la conduite d'aspiration (14′) et de la conduite sous vide (14), on a des vannes d'aspiration (10′) qui, à l'état couplé, peuvent être commutées manuellement ou par des signaux de commande, simultanément ou successivement par un dispositif de commande (11, 11′, 11˝), pour s'ouvrir et après aspiration du liquide, être commutées en position de fermeture par la montée en pression consécutive dans la conduite de vide (14).
7. Dispositif selon la revendication 6, caractérisé en ce que le signal de commande qui déclenche l'opération de commutation, de la vanne d'aspiration (10) du côté de la conduite de vide (14) est temporisé par rapport au signal de commande qui déclenche la fermeture de la vanne d'aspiration (10′) du côté du réservoir.
8. Dispositif selon la revendication 6 ou 7, caractérisé en ce que les deux vannes d'aspiration (10, 10′) sont commandées respectivement par un dispositif de commande associé (11, 11′) selon l'une ou plusieurs des revendications 1 à 6.
9. Dispositif selon la revendication 8, caractérisé en ce que les vannes de commande (11, 11′) des dispositifs de commande sont disposées directement l'une à côté de l'autre et sont actionnées par un organe de manoeuvre commun (11˝).
10. Dispositif selon la revendication 8 ou 9, caractérisé en ce que dans la conduite de commande (15) entre le point de raccordement (16) sur la conduite sous vide (14) et la vanne de commande (11) associée à la vanne d'aspiration (10) en aval il y a un point d'étranglement (16′).
11. Dispositif selon l'une des revendications 8 à 10, caractérisé en ce que la conduite de commande est subdivisée, entre la vanne d'aspiration amont (10′) et la vanne de commande associée (11′), en deux segments séparables (15′, 15˝) qui peuvent être couplés en même temps que les deux vannes d'aspiration (10, 10′).
12. Dispositif composé d'une vanne d'aspiration (10′) actionnée par dépression du côté du véhicule et d'un dispositif de commande avec vanne de commande (11′) selon l'une ou plusieurs des revendications 1 à 5, associée à la conduite sous vide (14), caractérisé en ce que la vanne d'aspiration (10′) peut être couplée à la conduite sous vide (14) et en même temps des segments (15′, 15˝) de la conduite de commande peuvent être couplés entre la vanne d'aspiration (10′) et la vanne de commande (11′).
13. Dispositif selon l'une des revendications 6 à 12, caractérisé en ce qu'à l'état couplé, la partie d'accouplement (26) tubulaire, en aval, pénètre avec du jeu radial dans l'autre partie d'accouplement (28), tubulaire et s'étend jusqu'à proximité de l'organe d'arrêt de la vanne d'aspiration (10′) prévue en amont.
EP89108124A 1988-05-10 1989-05-05 Dispositif de commande pour une vanne d'aspiration actionnée par dépression d'une conduite sous vide, particulièrement pour eaux d'égouts Expired - Lifetime EP0341595B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3815919 1988-05-10
DE3815919 1988-05-10
DE3823515 1988-07-12
DE3823515A DE3823515A1 (de) 1988-05-10 1988-07-12 Steuervorrichtung fuer ein durch unterdruck betaetigbares absaugventil an einer vakuumleitung, insbesondere fuer abwasser

Publications (2)

Publication Number Publication Date
EP0341595A1 EP0341595A1 (fr) 1989-11-15
EP0341595B1 true EP0341595B1 (fr) 1992-02-05

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EP89108124A Expired - Lifetime EP0341595B1 (fr) 1988-05-10 1989-05-05 Dispositif de commande pour une vanne d'aspiration actionnée par dépression d'une conduite sous vide, particulièrement pour eaux d'égouts

Country Status (3)

Country Link
EP (1) EP0341595B1 (fr)
DE (2) DE3823515A1 (fr)
ES (1) ES2030233T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0568890A1 (fr) * 1992-05-02 1993-11-10 Harald Michael Raccord pour une conduite à vide et à fluide
US5337773A (en) * 1992-05-20 1994-08-16 Harald Michael Vacuum-operated draining systems
DE19800958C2 (de) * 1997-02-12 2003-03-20 Evac Gmbh Vorrichtung zum Absaugen des Inhalts von Abwassersammeltanks

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4020062A1 (de) * 1990-06-23 1992-01-09 Harald Michael Vakuumabsauganlage fuer fluessigkeiten
DE4335945C2 (de) * 1993-10-22 1997-07-10 Roediger Anlagenbau Absaugvorrichtung
DE4336020C2 (de) * 1993-10-22 1997-05-15 Roediger Anlagenbau Steueranordnung für ein durch Unterdruck betätigbares Absperrventil
DE19635819C1 (de) * 1996-09-04 1998-02-19 Kutschke Fahrzeugbau Gmbh Entsorgungsfahrzeug
EP1091053A1 (fr) * 1999-10-05 2001-04-11 ROEDIGER VAKUUM- und HAUSTECHNIK GmbH Dispositif de commande pour une vanne d'obturation actionnée par dépression et méthode de commande de la vanne
DE20006269U1 (de) 2000-04-05 2000-12-21 Evac International Oy, Helsinki Anschlußkupplung zur Abwasserentsorgung von Flugzeugen
DE102007034499A1 (de) * 2007-07-25 2009-01-29 Aoa Apparatebau Gauting Gmbh Abwasser-Kontrollmodul mit einem Zwischenspeicher
DE102014100797B4 (de) 2014-01-24 2018-08-02 Bilfinger Water Technologies Gmbh Anordnung zum Absaugen von Flüssigkeit
CN112012303B (zh) * 2020-08-05 2021-08-24 国能龙源环保有限公司 液位控制装置及使用该装置的真空抽排系统及抽排方法

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IL23141A (en) * 1964-03-16 1968-09-26 Liljendahl S Discharge valve,particularly for water closets
FI57667C (fi) * 1974-10-10 1980-09-10 Waertsilae Oy Ab Automatisk styranordning
US3998736A (en) * 1976-05-12 1976-12-21 Greenleaf Jr John W Sewage disposal system
SE434535B (sv) * 1982-12-15 1984-07-30 Electrolux Ab Manoverdon vid med vakuum arbetande transportsystem for vetskor, foretredesvis vakuumavloppssystem
GB2149534B (en) * 1983-11-08 1986-12-10 Cowells Sewerage Systems Limit Liquid level control system
US4691731A (en) * 1983-12-08 1987-09-08 Burton Mechanical Contractors, Inc. Vacuum sewerage system with in pit breather
SE449883B (sv) * 1984-02-10 1987-05-25 Waertsilae Oy Ab Anordning vid ett vakuumtransportsystem for vetskor t ex vakuumavloppssystem
DE3680058D1 (de) * 1985-08-27 1991-08-08 Harald Michael Pneumatische steuervorrichtung fuer ein absperrventil einer vakuum-abwasserleitung.
US4674526A (en) * 1986-09-12 1987-06-23 Bellofram Corporation Switching valve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0568890A1 (fr) * 1992-05-02 1993-11-10 Harald Michael Raccord pour une conduite à vide et à fluide
US5322329A (en) * 1992-05-02 1994-06-21 Harald Michael Coupling for a vacuum fluid line
US5337773A (en) * 1992-05-20 1994-08-16 Harald Michael Vacuum-operated draining systems
DE19800958C2 (de) * 1997-02-12 2003-03-20 Evac Gmbh Vorrichtung zum Absaugen des Inhalts von Abwassersammeltanks

Also Published As

Publication number Publication date
ES2030233T3 (es) 1992-10-16
DE58900813D1 (de) 1992-03-19
DE3823515A1 (de) 1989-11-23
EP0341595A1 (fr) 1989-11-15

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