EP0222858B2 - Pipe cut-off device - Google Patents

Pipe cut-off device Download PDF

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Publication number
EP0222858B2
EP0222858B2 EP86903365A EP86903365A EP0222858B2 EP 0222858 B2 EP0222858 B2 EP 0222858B2 EP 86903365 A EP86903365 A EP 86903365A EP 86903365 A EP86903365 A EP 86903365A EP 0222858 B2 EP0222858 B2 EP 0222858B2
Authority
EP
European Patent Office
Prior art keywords
valve
outlet
bore
pipe separator
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 - Lifetime
Application number
EP86903365A
Other languages
German (de)
French (fr)
Other versions
EP0222858A1 (en
EP0222858B1 (en
Inventor
Hans Kern
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.)
Gruenbeck Wasseraufbereitung GmbH
Original Assignee
Gruenbeck Wasseraufbereitung 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
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Application filed by Gruenbeck Wasseraufbereitung GmbH filed Critical Gruenbeck Wasseraufbereitung GmbH
Priority to AT86903365T priority Critical patent/ATE40434T1/en
Publication of EP0222858A1 publication Critical patent/EP0222858A1/en
Publication of EP0222858B1 publication Critical patent/EP0222858B1/en
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7762—Fluid pressure type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87917—Flow path with serial valves and/or closures
    • Y10T137/88054—Direct response normally closed valve limits direction of flow

Definitions

  • the invention relates to a pipe separator according to the preamble of claim 1.
  • Such a pipe separator is known from DE-A-33 23 324.
  • a so-called injection pump is provided in series with a check valve, which generates a negative pressure when the medium is flowing, with which the pressure comparison valve is acted upon.
  • the object of the invention is to provide a pipe separator of the type described above, which is improved compared to the known type. In particular, it should have fewer switching vibrations.
  • the pipe separator 1 has an inlet 2 that can be connected to a pipe and an outlet 3 that can be connected to a pipe.
  • a slide 4 with a connecting channel 5 is provided between input 2 and output 3. As can be seen from FIG. 1, the slide connects input 2 and output 3 in the position shown, while in a second position, not shown, in which it is displaced transversely to the connecting channel, it separates the input and output.
  • the slide 4 extends with one end into a cylinder 6, in which it can slide back and forth as a piston depending on the pressure prevailing in the cylinder.
  • the interior of the cylinder 6 can be connected to the input 2 via a control valve 7 and a connecting line 8.
  • the control valve 7 has a valve chamber with a first section 9 and a second section 10.
  • the first section 9 is connected on the input side to the connecting line 8 forming the first input of the control valve and on the output side to the second section 10.
  • the second section is designed as a bore, which ends at its end facing away from the first section into a bore 11 of the slide 4, which in turn leads via an outlet bore 12 into the open or into a space which is at ambient pressure or at least with a pressure is applied, which is lower than the pressure prevailing when the flow medium is present at the inlet 2.
  • the second section 10 is connected to the interior of the cylinder 6 via transverse bores 13. It has valve seats 15, 16 both at its end facing the first section and at its end facing the bore 11.
  • a valve stem 17 is provided which extends through the second section and has a valve body 18 at its end facing away from the first section and a second valve body 19 at a distance therefrom which is greater than the distance between the two valve seats 15, 16.
  • the surface of the second valve body 19 facing the first section is larger than the area of the first valve body 18 which is acted upon over the second section.
  • the wall of the first section 9 opposite the second section 10 is formed by a membrane 21 firmly clamped at its edge by a control valve housing 20.
  • the valve stem 17 is extended so far through the first section that it passes through the membrane 21 with an abutment plate 22 and is firmly connected to the membrane 21 itself.
  • the control valve housing 20 On the side of the membrane facing away from the valve space, the control valve housing 20 forms a space 23 which is delimited by an abutment 24 on the side facing away from the membrane.
  • a compression spring 25 Arranged between the abutment 24 and the abutment plate 22 is a compression spring 25 which prestresses the membrane and thus the valve body into the second position via the abutment plate.
  • the space 23 is connected to the surroundings via a bore 26 which passes through the control valve housing.
  • the abutment plate 22 is fixedly connected via a connecting rod to a second pressure measuring device in the form of a second membrane 27 firmly clamped at its edges and arranged coaxially to the membrane 21.
  • the side of the second membrane facing the membrane 21 is connected to the environment via a bore 28, while the side of the second membrane facing away from the membrane 21 is connected to a connecting line 30 via a bore forming the second input of the control valve.
  • valve body 33 On the outlet side 3 there is a shut-off valve with a valve seat 32 arranged on the inlet side of the outlet 3 and a valve body 33 cooperating therewith.
  • the valve body 33 has on its rear side a valve stem 34 which is mounted in a suitable holder so as to be displaceable against the valve seat or movable away therefrom.
  • a compression spring 35 is provided on a suitable abutment, by means of which the valve body is biased towards the valve seat.
  • a 2-3-way valve 36 is provided. This has a housing 37 with a through this in the longitudinal direction extending cylinder bore 38. At one end of the cylinder bore, a cap 39 made of transparent material is provided, which is screwed to the housing. The cylinder bore 38 continues into the cap, but does not pass through it and is rather closed in one direction by the cap. On the side of the housing opposite the cap 39, a cylinder 40 is provided, in which a piston 41 is arranged such that it can be moved back and forth in the axial direction of the bore in the cylinder. The piston is fixedly connected to a control rod 42 which extends into the cylinder bore 38 and is guided by it.
  • the control rod 42 has at its end facing the cap 39 a first section 43, the diameter of which is smaller than that of the cylinder bore. This is followed by a second section 44, which has essentially the same diameter as the cylinder bore 38. This is followed by a third section 45, the diameter of which is in turn smaller than the diameter of the cylinder bore. This is followed by a fourth section extending up to the piston 41, the diameter of which is again essentially the same as that of the cylinder bore.
  • a compression spring 48 is provided between an abutment surface 47 of the housing and the piston 41, which pushes the piston and thus the control rod firmly connected to it into the position shown in FIG. 3, in which the piston moves away from the housing to the base of the cylinder 40 moved, biased.
  • the piston 41 and thus the control rod 42 can move back and forth between this first position and a second position shown in FIG. 4, in which the piston is moved against the spring action up to the housing and the control rod into the bore of the cap 39 will.
  • a first transverse bore 58 leading into the cylinder bore 38 is provided in the housing, which is arranged in such a way that in the second position shown in FIG. 2 a region opens into the cylinder bore 38 , in which the first section 43 of the control rod lies.
  • the first transverse bore 58 is connected to one end of a line 49, which ends at the other end on the outlet-side rear side of the valve body 33 in the outlet 3, as best shown in FIG. 1.
  • the cylinder bore 38 has a first section 51, the diameter of which is substantially equal to the diameter of the second section 44 of the control rod 42. This extends from the cap 39 to close to the end of the second section 44 of the control rod facing the piston 41. This first section is followed by a second section 52 directed toward the piston, the diameter of which is larger than the diameter of the second section 44 of the control rod.
  • a second transverse bore 50 is provided which opens into the upper end of the second section 52 of the cylinder bore facing away from the piston 41 and which is connected via a line 53 to the atmosphere or to the space into which the outlet bore 12 also opens .
  • a third transverse bore 54 is provided, which, as is shown in particular in FIGS. 3 and 4, opens into the lower end of the second section of the cylinder bore facing the piston rod and which connects to the bore 29 of the control valve 7 via a connecting line 30 and is connected to the second membrane chamber thereof.
  • sealing rings 55 and 56 are provided in the cylinder bore, which are arranged in the axial direction in such a way that, in the position shown in FIG. 4, a seal lies between the piston and the housing first space 57 and the cylinder bore and in the first position shown in FIG. 3, a seal between the second transverse bore and the third transverse bore takes place.
  • a connecting bore 70 is provided between the first space 57 and the first transverse bore 58. Furthermore, as can best be seen from FIG. 5, which shows the part encircled in FIG. 4 enlarged, between the first space 57 and the second formed between the rear side of the piston 41 facing away from the housing and the bottom of the cylinder 40 Room 59 provided a restricted path.
  • the piston has an annular groove 60 on its outer circumference, in which a loose ring seal 61, which is biased against the cylinder wall, is provided.
  • a throttle bore 62 is provided between the annular groove 60 and the surface of the piston facing the first space 57.
  • a bore which can be connected to an inlet 63 and in which a check valve 64 is arranged, which allows an inlet into the second chamber 59 and against a return from the second chamber into the inlet 63 locks.
  • the inlet 63 is connected via a line 65 in the manner best shown in FIG. 1 to the region 66 which is adjacent to the slide on one side and is delimited on the other side by the valve seat 32, that is to say when the valve body is seated 33 is closed towards the exit.
  • a membrane pressure accumulator 67 is also provided, which is connected to the outlet side 3 of the pipe separator via a bore 68 leading into the outlet chamber.
  • the pipe separator is initially in the flow position shown in FIG. 1.
  • the input 2 is acted upon by a liquid medium, which by the connecting channel 5, the valve 32, 33 and the output 3 flows to a consumer.
  • the medium flows via the line 8 into the valve chamber 9 and exerts a force on the membrane 21 in the direction of the first position of the control valve 7 shown in FIG. 1. This force is opposed by the force exerted on the second diaphragm 27 by the compression spring 25 and by the pressure of the medium applied via the connecting line 30.
  • the control valve 7 is in the first position shown in FIG. 1. In this position, the inside of the cylinder 6 is acted upon by the inlet-side pressure via the transverse bores 13 and the connecting line 8.
  • the prestressing of a compression spring 69 which prestresses the slide 4 into the blocking position is selected such that in this valve position, when there is a pressure on the inlet side which corresponds to the pressure which prevails at the inlet 2 when the flow medium is present at full pressure in the inlet side, the slide 4 is in the flow position shown.
  • the springs 25 and 35 are designed for 0.55 bar, while the spring 48 is designed for 0.3 bar.
  • the valve body 33 If the pressure prevailing at the inlet 2 falls below a value predetermined by the spring sizes relative to the pressure prevailing at the outlet 3, the valve body 33 first goes into the closed position shown in FIG. 2. At the same time, the check valve 64 closes.
  • the spring 48 causes the piston 41 to displace the liquid in the second chamber 59 via the throttle bore 62 into the first chamber 57 and the piston moves from the position shown in FIG. 4 to the position in FIG. 3 position shown moves.
  • the relatively higher pressure present at the outlet reaches the area above the diaphragm 27.
  • the control valve is moved into its second position, shown in FIG.
  • valve body 19 is separated from the second section 10 and the interior of the cylinder 6 is connected to the bore 11 by lifting the valve body 18 from the valve seat 16.
  • the pressure in the interior of the cylinder 21 decreases, so that the compression spring 69 moves the slide 4 into its second position, shown in FIG. 2, in which the inlet and outlet are separated.
  • the pipe separator remains in the blocking position shown in FIG. 2, and the small amount of water is removed from the diaphragm pressure accumulator 67 in a known manner.
  • the third position shown in FIG. 6 is reached.
  • the slide 4 and the check valve 64 are in the flow position.
  • the piston 41 has moved from the position shown in FIG. 3 to the position shown in FIG. 4. This is achieved in that the valve 32, 33 is subjected to a greater pre-tension than the product from piston 41 in connection with the spring 48.
  • the pressure holding effect between line 65 and 49 is greater in the valve 32, 33 than between piston 41 and Spring 48.
  • a small amount of water can be removed via lines 65 and 49. If the amount of water decreases again somewhat, the check valve 64 is first moved back into the blocking position, and then the return movement of the piston 41 starts from the position shown in FIG. 4 to the position shown in FIG. 3. If the amount of water increases again before the lowest piston position shown in FIG. 3 is reached, the piston goes up again without the slide 4 going into the disconnected position in between.
  • the valve 36 thus brings about damping and reducing the switching frequency of the slide 4.

Abstract

Pipe cutting device (1) having a control valve (7) for actuating a slide valve (4). In order to prolong the lifetime of the latter by avoiding an unnecessarily high number of switching actuationsthere is provided a 2-3-distributing valve (36) which acts as an anti-vibration member.

Description

Die Erfindung betrifft einen Rohrtrenner nach dem Oberbegriff des Patentanspruches 1.The invention relates to a pipe separator according to the preamble of claim 1.

Ein derartiger Rohrtrenner ist aus der DE-A-33 23 324 bekannt. Dabei ist in Reihe zu einem Rückschlagventil eine sogenannte Injektionspumpe vorgesehen, die bei strömendem Medium einen Unterdruck erzeugt, mit welchem das Druckvergleichsventil beaufschlagt wird.Such a pipe separator is known from DE-A-33 23 324. In this case, a so-called injection pump is provided in series with a check valve, which generates a negative pressure when the medium is flowing, with which the pressure comparison valve is acted upon.

Aufgabe der Erfindung ist es, einen Rohrtrenner der eingangs beschriebenen Art zu schaffen, der gegenuber der bekannten Art verbessert ist. Insbesondere soll er weniger Schaltschwingungen aufweisen.The object of the invention is to provide a pipe separator of the type described above, which is improved compared to the known type. In particular, it should have fewer switching vibrations.

Diese Aufgabe wird durch einen Rohrtrenner der eingangs beschriebenen Art gelöst, der gemäß der Erfindung gekennzeichnet ist durch die Merkmale des Kennzeichens des Anspruches 1.This object is achieved by a pipe separator of the type described at the outset, which is characterized according to the invention by the features of the characterizing part of claim 1.

Weitere Merkmale und Zweckmäßigkeiten der Erfindung ergeben sich aus der Beschreibung eines Ausfuhrungsbeispieles anhand der Figuren. Von den Figuren zeigen:

  • Fig. 1 einen Schnitt durch einen Rohrtrenner nach der Erfindung in einer ersten Stellung;
  • Fig. 2 den in Fig. 1 gezeigten Rohrtrenner in einer zweiten Stellung;
  • Fig. 3 eine vergrößerte Darstellung des bei dem in Fig. 1 und 2 gezeigten Rohrtrenner verwendeten Ventiles in einer ersten Stellung;
  • Fig. 4 das in Fig. 3 gezeigte Ventil in einer zweiten Stellung;
  • Fig. 5 eine vergrößerte Darstellung eines Teiles des in Fig. 4 gezeigten Ventiles; und
  • Fig. 6 eine dritte Schaltstellung des Rohrtrenners.
Further features and advantages of the invention result from the description of an exemplary embodiment with reference to the figures. From the figures show:
  • 1 shows a section through a pipe separator according to the invention in a first position.
  • FIG. 2 shows the pipe separator shown in FIG. 1 in a second position;
  • 3 shows an enlarged illustration of the valve used in the pipe separator shown in FIGS. 1 and 2 in a first position;
  • 4 shows the valve shown in FIG. 3 in a second position;
  • Fig. 5 is an enlarged view of part of the valve shown in Fig. 4; and
  • Fig. 6 shows a third switching position of the pipe separator.

Der Rohrtrenner 1 weist einen mit einem Rohr verbindbaren Eingang 2 und einen mit einem Rohr verbindbaren Ausgang 3 auf. Zwischen Eingang 2 und Ausgang 3 ist ein Schieber 4 mit einem Verbindungskanal 5 vorgesehen. Wie aus Fig. 1 ersichtlich ist, verbindet der Schieber in der gezeigten Stellung Eingang 2 und Ausgang 3, während er in einer zweiten nichtgezeigten Stellung, in der er quer zu dem Verbindungskanal verschoben ist, Eingang und Ausgang voneinander trennt. Der Schieber 4 reicht mit seinem einen Ende in einen Zylinder 6, in dem er als Kolben in Abhängigkeit von dem im Zylinder herrschenden Druck hin- und hergleiten kann. Das Innere dem Zylinders 6 ist über ein Steuerventil 7 und eine Verbindungsleitung 8 mit dem Eingang 2 verbindbar. Das Steuerventil 7 weist einen Ventilraum mit einem ersten Abschnitt 9 und einem zweiten Abschnitt 10 auf. Der erste Abschnitt 9 ist eingangsseitig mit der den ersten Eingang des Steuerventiles bildenden Verbindungsleitung 8 und ausgangsseitig mit dem zweiten Abschnitt 10 verbunden. Der zweite Abschnitt ist als eine Bohrung ausgebildet, die an ihrem dem ersten Abschnitt abgewandten Ende in eine Bohrung 11 des Schiebers 4 mündet, welche wiederum über eine Austrittsbohrung 12 ins Freie bzw. in einen Raum führt, der mit Umgebungsdruck oder doch zumindest mit einem Druck beaufschlagt ist, welcher geringer ist als der bei Anliegen des Strömungsmediums am Eingang 2 herrschende Druck.The pipe separator 1 has an inlet 2 that can be connected to a pipe and an outlet 3 that can be connected to a pipe. A slide 4 with a connecting channel 5 is provided between input 2 and output 3. As can be seen from FIG. 1, the slide connects input 2 and output 3 in the position shown, while in a second position, not shown, in which it is displaced transversely to the connecting channel, it separates the input and output. The slide 4 extends with one end into a cylinder 6, in which it can slide back and forth as a piston depending on the pressure prevailing in the cylinder. The interior of the cylinder 6 can be connected to the input 2 via a control valve 7 and a connecting line 8. The control valve 7 has a valve chamber with a first section 9 and a second section 10. The first section 9 is connected on the input side to the connecting line 8 forming the first input of the control valve and on the output side to the second section 10. The second section is designed as a bore, which ends at its end facing away from the first section into a bore 11 of the slide 4, which in turn leads via an outlet bore 12 into the open or into a space which is at ambient pressure or at least with a pressure is applied, which is lower than the pressure prevailing when the flow medium is present at the inlet 2.

Der zweite Abschnitt 10 ist über Querbohrungen 13 mit dem Inneren des Zylinders 6 verbunden. Er weist sowohl an seinem dem ersten Abschnitt zugewandten Ende als auch an seinem der Bohrung 11 zugewandten Ende Ventilsitze 15, 16 auf. Es ist ein durch den zweiten Abschnitt hindurchgeführter Ventilschaft 17 vorgesehen, der an seinem dem ersten Abschnitt abgewandten Ende einen Ventilkörper 18 und in einem Abstand von diesem, der größer ist als der Abstand der beiden Ventilsitze 15, 16, einen zweiten Ventilkörper 19 aufweist. Wie aus Fig. 1 ersichtlich ist, ist die dem ersten Abschnitt zugewandte Oberfläche des zweiten Ventilkörpers 19 größer als die über dem zweiten Abschnitt beaufschlagte Fläche des ersten Ventilkörpers 18.The second section 10 is connected to the interior of the cylinder 6 via transverse bores 13. It has valve seats 15, 16 both at its end facing the first section and at its end facing the bore 11. A valve stem 17 is provided which extends through the second section and has a valve body 18 at its end facing away from the first section and a second valve body 19 at a distance therefrom which is greater than the distance between the two valve seats 15, 16. As can be seen from FIG. 1, the surface of the second valve body 19 facing the first section is larger than the area of the first valve body 18 which is acted upon over the second section.

Die dem zweiten Abschnitt 10 gegenüberliegende Wandung des ersten Abschnittes 9 wird durch eine durch ein Steuervenrilgehäuse 20 an ihrem Rand jeweils fest eingespannte Membran 21 gebildet. Der Ventilschaft 17 ist durch den ersten Abschnitt hindurch so weit verlängert, daß er durch die Membran 21 hindurchgeführt mit einer Widerlagerplatte 22 und mit der Membran 21 selbst fest verbunden ist. Auf der dem Ventilraum abgewandten Seite der Membran bildet das Steuerventilgehäuse 20 einen Raum 23, der auf der der Membran abgewandten Seite durch ein Widerlager 24 begrenzt ist. Zwischen dem Widerlager 24 und der Widerlagerplatte 22 ist eine Druckfeder 25 angeordnet, die über die Widerlagerplatte die Membran und damit den Ventilkörper in die zweite Stellung vorspannt. Der Raum 23 ist über eine durch das Steuerventilgehäuse gehende Bohrung 26 mit der Umgebung verbunden. Die Widerlagerplatte 22 ist über eine Verbindungsstange fest mit einer zweiten Druckmeßeinrichtung in Form einer an ihren Rändern fest eingespannten und koaxial zur Membran 21 angeordneten zweiten Membran 27 verbunden. Die der Membran 21 zugewandte Seite der zweiten Membran steht über eine Bohrung 28 mit der Umgebung in Verbindung, während die der Membran 21 abgewandte Seite der zweiten Membran uber eine den zweiten Eingang des Steuerventiles bildende Bohrung mit einer Verbindungsleitung 30 verbunden ist.The wall of the first section 9 opposite the second section 10 is formed by a membrane 21 firmly clamped at its edge by a control valve housing 20. The valve stem 17 is extended so far through the first section that it passes through the membrane 21 with an abutment plate 22 and is firmly connected to the membrane 21 itself. On the side of the membrane facing away from the valve space, the control valve housing 20 forms a space 23 which is delimited by an abutment 24 on the side facing away from the membrane. Arranged between the abutment 24 and the abutment plate 22 is a compression spring 25 which prestresses the membrane and thus the valve body into the second position via the abutment plate. The space 23 is connected to the surroundings via a bore 26 which passes through the control valve housing. The abutment plate 22 is fixedly connected via a connecting rod to a second pressure measuring device in the form of a second membrane 27 firmly clamped at its edges and arranged coaxially to the membrane 21. The side of the second membrane facing the membrane 21 is connected to the environment via a bore 28, while the side of the second membrane facing away from the membrane 21 is connected to a connecting line 30 via a bore forming the second input of the control valve.

Auf der Ausgangsseite 3 ist ein Sperrventil mit einem an der Zulaufseite des Ausganges 3 angeordneten Ventilsitz 32 und einem damit zusammenwirkenden Ventilkörper 33 vorgesehen. Der Ventilkörper 33 weist auf seiner Rückseite einen Ventilschaft 34 auf, der in einer geeigneten Halterung verschiebbar gegen den Ventilsitz bzw. von diesem weg bewegbar gelagert ist. Es ist eine an einem geeigneten Widerlager vorgesehene Druckfeder 35 vorgesehen, durch die der Ventilkörper zum Ventilsitz hin vorgespannt ist.On the outlet side 3 there is a shut-off valve with a valve seat 32 arranged on the inlet side of the outlet 3 and a valve body 33 cooperating therewith. The valve body 33 has on its rear side a valve stem 34 which is mounted in a suitable holder so as to be displaceable against the valve seat or movable away therefrom. A compression spring 35 is provided on a suitable abutment, by means of which the valve body is biased towards the valve seat.

Ferner ist ein 2-3-Wegeventil 36 vorgesehen. Dieses weist ein Gehäuse 37 mit einer sich durch dieses in Längsrichtung erstreckenden Zylinderbohrung 38 auf. An dem einen Ende der Zylinderbohrung ist eine Kappe 39 aus durchsichtigem Material vorgesehen, die mit dem Gehäuse verschraubt ist. Die Zylinderbohrung 38 setzt sich in die Kappe hinein fort, geht jedoch nicht durch diese hindurch und wird vielmehr durch die Kappe in einer Richtung verschlossen. An der der Kappe 39 gegenüberliegenden Seite des Gehäuses ist ein Zylinder 40 vorgesehen, in dem ein Kolben 41 so angeordnet ist, daß er in Axialrichtung der Bohrung im Zylinder hin- und herbewegbar ist. Der Kolben ist mit einer in die Zylinderbohrung 38 hineinreichenden und von dieser geführten Steuerstange 42 fest verbunden. Die Steuerstange 42 weist an ihrem der Kappe 39 zugewandten Ende einen ersten Abschnitt 43 auf, dessen Durchmesser kleiner als der der Zylinderbohrung ist. Daran schließt sich ein zweiter Abschnitt 44 an, der im wesentlichen den gleichen Durchmesser wie die Zylinderbohrung 38 aufweist. An diesen schließt sich ein dritter Abschnitt 45 an, dessen Durchmesser wiederum kleiner als der Durchmesser der Zylinderbohrung ist. An diesen schließt sich ein bis zu dem Kolben 41 reichender vierter Abschnitt an, dessen Durchmesser wieder im wesentlichen gleich dem der Zylinderbohrung ist.Furthermore, a 2-3-way valve 36 is provided. This has a housing 37 with a through this in the longitudinal direction extending cylinder bore 38. At one end of the cylinder bore, a cap 39 made of transparent material is provided, which is screwed to the housing. The cylinder bore 38 continues into the cap, but does not pass through it and is rather closed in one direction by the cap. On the side of the housing opposite the cap 39, a cylinder 40 is provided, in which a piston 41 is arranged such that it can be moved back and forth in the axial direction of the bore in the cylinder. The piston is fixedly connected to a control rod 42 which extends into the cylinder bore 38 and is guided by it. The control rod 42 has at its end facing the cap 39 a first section 43, the diameter of which is smaller than that of the cylinder bore. This is followed by a second section 44, which has essentially the same diameter as the cylinder bore 38. This is followed by a third section 45, the diameter of which is in turn smaller than the diameter of the cylinder bore. This is followed by a fourth section extending up to the piston 41, the diameter of which is again essentially the same as that of the cylinder bore.

Zwischen einer Widerlagerfläche 47 des Gehäuses und dem Kolben 41 ist eine Druckfeder 48 vorgesehen, die den Kolben und damit die mit diesem fest verbundene Steuerstange in die in Fig. 3 gezeigte Stellung, in der der Kolben von dem Gehäuse weg bis zum Grund des Zylinders 40 bewegt ist, vorgespannt. Der Kolben 41 und damit die Steuerstange 42 können zwischen dieser ersten Stellung und einer in Fig. 4 gezeigten zweiten Stellung, in der der Kolben entgegen der Federwirkung bis zum Gehäuse und die Steuerstange bis in die Bohrung der Kappe 39 bewegt sind, hin- und herbewegt werden.A compression spring 48 is provided between an abutment surface 47 of the housing and the piston 41, which pushes the piston and thus the control rod firmly connected to it into the position shown in FIG. 3, in which the piston moves away from the housing to the base of the cylinder 40 moved, biased. The piston 41 and thus the control rod 42 can move back and forth between this first position and a second position shown in FIG. 4, in which the piston is moved against the spring action up to the housing and the control rod into the bore of the cap 39 will.

Wie am besten aus Fig. 4 ersichtlich ist, ist in dem Gehäuse eine in die Zylinderbohrung 38 führende erste Querbohrung 58 vorgesehen, die so angeordnet ist, daß sich in der in Fig. 2 gezeigten zweiten Stellung in dem Bereich in die Zylinderbohrung 38 ein mündet, in dem der erste Abschnitt 43 der Steuerstange liegt. Die erste Querbohrung 58 ist mit einem Ende einer Leitung 49 verbunden, die mit ihrem anderen Ende auf der ausgangsseitigen Rückseite des Ventilkörpers 33 in den Ausgang 3 mündet, wie am besten in Fig. 1 gezeigt.As can best be seen from FIG. 4, a first transverse bore 58 leading into the cylinder bore 38 is provided in the housing, which is arranged in such a way that in the second position shown in FIG. 2 a region opens into the cylinder bore 38 , in which the first section 43 of the control rod lies. The first transverse bore 58 is connected to one end of a line 49, which ends at the other end on the outlet-side rear side of the valve body 33 in the outlet 3, as best shown in FIG. 1.

Die Zylinderbohrung 38 weist einen ersten Abschnitt 51 auf, dessen Durchmesser im wesentlichen gleich dem Durchmesser des zweiten Abschnittes 44 der Steuerstange 42 ist. Dieser reicht von der Kappe 39 bis nahe zu dem dem Kolben 41 zugewandten Ende des zweiten Abschnittes 44 der Steuerstange. An diesen ersten Abschnitt schließt sich zum Kolben hin gerichtet ein zweiter Abschnitt 52 an, dessen Durchmesser größer als der Durchmesser des zweiten Abschnittes 44 der Steuerstange ist. Es ist eine zweite Querbohrung 50 vorgesehen, die an dem dem Kolben 41 abgewandten oberen Ende des zweiten Abschnittes 52 der Zylinderbohrung in diese einmündet und die über eine Leitung 53 mit Atmosphäre bzw. mit dem Raum, in den auch die Austrittsbohrung 12 mündet, verbunden ist. Ferner ist eine dritte Querbohrung 54 vorgesehen, die, wie insbesondere in den Fig. 3 und 4 gezeigt ist, an dem der Kolbenstange zugewandten unteren Ende des zweiten Abschnittes der Zylinderbohrung in diese einmündet und die über eine Verbindungsleitung 30 mit der Bohrung 29 des Steuerventiles 7 und damit mit der zweiten Membrankammer derselben verbunden ist.The cylinder bore 38 has a first section 51, the diameter of which is substantially equal to the diameter of the second section 44 of the control rod 42. This extends from the cap 39 to close to the end of the second section 44 of the control rod facing the piston 41. This first section is followed by a second section 52 directed toward the piston, the diameter of which is larger than the diameter of the second section 44 of the control rod. A second transverse bore 50 is provided which opens into the upper end of the second section 52 of the cylinder bore facing away from the piston 41 and which is connected via a line 53 to the atmosphere or to the space into which the outlet bore 12 also opens . Furthermore, a third transverse bore 54 is provided, which, as is shown in particular in FIGS. 3 and 4, opens into the lower end of the second section of the cylinder bore facing the piston rod and which connects to the bore 29 of the control valve 7 via a connecting line 30 and is connected to the second membrane chamber thereof.

Wie am besten aus den Fig. 3 und 4 ersichtlich ist, sind in der Zylinderbohrung 38 Dichtringe 55 und 56 vorgesehen, die in axialer Richtung so angeordnet sind, daß in der in Fig. 4 gezeigten Stellung eine Abdichtung zwischen dem zwischen Kolben und Gehäuse liegenden ersten Raum 57 und der Zylinderbohrung und in der in Fig. 3 gezeigten ersten Stellung eine Abdichtung zwischen der zweiten Querbohrung und der dritten Querbohrung erfolgt.As can best be seen from FIGS. 3 and 4, 38 sealing rings 55 and 56 are provided in the cylinder bore, which are arranged in the axial direction in such a way that, in the position shown in FIG. 4, a seal lies between the piston and the housing first space 57 and the cylinder bore and in the first position shown in FIG. 3, a seal between the second transverse bore and the third transverse bore takes place.

Zwischen dem ersten Raum 57 und der ersten Querbohrung 58 ist eine Verbindungsbohrung 70 vorgesehen. Ferner ist, wie am besten aus Fig. 5, welche den in Fig. 4 eingekreisten Teil vergrößert darstellt, zu ersehen ist, zwischen dem ersten Raum 57 und dem zwischen der dem Gehäuse abgewandten Ruckseite des Kolbens 41 und dem Boden des Zylinders 40 gebildeten zweiten Raum 59 ein gedrosselter Weg vorgesehen. Der Kolben weist auf seinem Außenumfang eine Ringnut 60 auf, in der eine lose liegende und gegen die Zylinderwand vorgespannte Ringdichtung 61 vorgesehen ist. Zwischen der Ringnut 60 und der dem ersten Raum 57 zugewandten Oberfläche des Kolbens ist eine Drosselbohrung 62 vorgesehen.A connecting bore 70 is provided between the first space 57 and the first transverse bore 58. Furthermore, as can best be seen from FIG. 5, which shows the part encircled in FIG. 4 enlarged, between the first space 57 and the second formed between the rear side of the piston 41 facing away from the housing and the bottom of the cylinder 40 Room 59 provided a restricted path. The piston has an annular groove 60 on its outer circumference, in which a loose ring seal 61, which is biased against the cylinder wall, is provided. A throttle bore 62 is provided between the annular groove 60 and the surface of the piston facing the first space 57.

Ferner ist an der dem Kolben 41 gegenüberliegenden Seite des Zylinders 40 eine mit einem Zulauf 63 verbindbare Bohrung vorgesehen, in der ein Rückschlagventil 64 angeordnet ist, welches einen Zulauf in den zweiten Raum 59 gestattet und gegen einen Rücklauf aus dem zweiten Raum in den Zulauf 63 sperrt.Furthermore, on the side of the cylinder 40 opposite the piston 41, there is a bore which can be connected to an inlet 63 and in which a check valve 64 is arranged, which allows an inlet into the second chamber 59 and against a return from the second chamber into the inlet 63 locks.

Der Zulauf 63 ist über eine Leitung 65 in der am besten aus Fig. 1 ersichtlichen Weise mit dem Bereich 66 verbunden, der auf der einen Seite an den Schieber angrenzt und auf der anderen Seite durch den Ventilsitz 32 begrenzt wird, der also bei aufsitzendem Ventilkörper 33 zum Ausgang hin geschlossen ist.The inlet 63 is connected via a line 65 in the manner best shown in FIG. 1 to the region 66 which is adjacent to the slide on one side and is delimited on the other side by the valve seat 32, that is to say when the valve body is seated 33 is closed towards the exit.

Schließlich ist noch ein Membrandruckspeicher 67 vorgesehen, der mit der Ausgangsseite 3 des Rohrtrenners über eine in den Ausgangsraum führende Bohrung 68 verbunden ist.Finally, a membrane pressure accumulator 67 is also provided, which is connected to the outlet side 3 of the pipe separator via a bore 68 leading into the outlet chamber.

Im Betrieb befindet sich der Rohrtrenner zunächst in der in Fig. 1 gezeigten Durchflußstellung. Der Eingang 2 wird mit einem flüssigen Medium beaufschlagt, welches durch den Verbindungskanal 5, das Ventil 32, 33 und den Ausgang 3 zu einem Verbraucher fließt. Gleichzeitig fließt das Medium über die Leitung 8 in den Ventilraum 9 und übt auf die Membran 21 eine Kraft in Richtung der in Fig. 1 gezeigten ersten Stellung des Steuerventiles 7 aus. Dieser Kraft entgegengerichtet ist die durch die Druckfeder 25 und die vom Druck des über die Verbindungsleitung 30 anliegenden Mediums auf die zweite Membran 27 ausgeübte Kraft. Übersteigt der in dem ersten Abschnitt 9 anliegende Druck den Druck, der von dem über die Verbindungsleitung 30 zugefuhrten Medium auf die zweite Membran 27 ausgeübten Druck um ein bestimmtes Maß, welches von den Flächen der Membranen 21 und 27 und der Größe der Vorspannung der Druckfeder 25 vorgegeben ist, dann befindet sich das Steuerventil 7 in der in Fig. 1 gezeigten ersten Stellung. In dieser Stellung ist das Innere des Zylinders 6 über die Querbohrungen 13 und die Verbindungsleitung 8 mit dem eingangsseitigen Druck beaufschlagt. Die Vorspannung einer den Schieber 4 in die Sperrstellung vorspannenden Druckfeder 69 ist so gewählt, daß sich in dieser Ventilstellung bei Vorliegen eines eingangsseitigen Druckes, der demjenigen Druck entspricht, welcher am Eingang 2 dann herrscht, wenn das Strömungsmedium in der Eingangsseite mit vollem Druck anliegt, der Schieber 4 in der gezeigten Durchflußstellung steht.In operation, the pipe separator is initially in the flow position shown in FIG. 1. The input 2 is acted upon by a liquid medium, which by the connecting channel 5, the valve 32, 33 and the output 3 flows to a consumer. At the same time, the medium flows via the line 8 into the valve chamber 9 and exerts a force on the membrane 21 in the direction of the first position of the control valve 7 shown in FIG. 1. This force is opposed by the force exerted on the second diaphragm 27 by the compression spring 25 and by the pressure of the medium applied via the connecting line 30. If the pressure present in the first section 9 exceeds the pressure exerted on the second membrane 27 by the medium supplied via the connecting line 30 by a certain amount, which depends on the areas of the membranes 21 and 27 and the size of the prestress of the compression spring 25 is specified, then the control valve 7 is in the first position shown in FIG. 1. In this position, the inside of the cylinder 6 is acted upon by the inlet-side pressure via the transverse bores 13 and the connecting line 8. The prestressing of a compression spring 69 which prestresses the slide 4 into the blocking position is selected such that in this valve position, when there is a pressure on the inlet side which corresponds to the pressure which prevails at the inlet 2 when the flow medium is present at full pressure in the inlet side, the slide 4 is in the flow position shown.

In dem oben beschriebenen Ausfuhrungsbeispiel sind die Federn 25 und 35 auf 0,55 bar ausgelegt, während die Feder 48 auf 0,3 bar ausgelegt ist.In the exemplary embodiment described above, the springs 25 and 35 are designed for 0.55 bar, while the spring 48 is designed for 0.3 bar.

Unterschreitet der am Eingang 2 herrschende Druck relativ zu dem am Ausgang 3 herrschenden Druck einen durch die Federgrößen vorgegebenen Wert, dann geht zunächst der Ventilkörper 33 in die in Fig. 2 gezeigte Schließstellung. Gleichzeitig schließt das Rückschlagventil 64. Die Feder 48 bewirkt, daß der Kolben 41 die im zweiten Raum 59 befindliche Flüssigkeit über die Drosselbohrung 62 in den ersten Raum 57 verdrängt und sich der Kolben aus der in Fig. 4 gezeigten Stellung in die in Fig. 3 gezeigte Stellung bewegt. Dadurch gelangt der am Ausgang anliegende relativ höhere Druck in den Bereich oberhalb der Membran 27. Dadurch und durch die gleichzeitige Wirkung der Druckfeder 25 wird das Steuerventil in seine in Fig. 2 gezeigte zweite Stellung bewegt, in der der erste Abschnitt 9 des Ventilraumes durch den Ventilkörper 19 vom zweiten Abschnitt 10 getrennt und der Innenraum des Zylinders 6 dadurch, daß der Ventilkörpar 18 vom Ventilsitz 16 abgehoben wird, mit der Bohrung 11 verbunden wird. Dadurch nimmt der Druck im Inhenraum des Zylinders 21 ab, so daß die Druckfeder 69 den Schieber 4 in seine in Fig. 2 gezeigte zweite Stellung bewegt, in der eine Trennung von Ein- und Ausgang erfolgt.If the pressure prevailing at the inlet 2 falls below a value predetermined by the spring sizes relative to the pressure prevailing at the outlet 3, the valve body 33 first goes into the closed position shown in FIG. 2. At the same time, the check valve 64 closes. The spring 48 causes the piston 41 to displace the liquid in the second chamber 59 via the throttle bore 62 into the first chamber 57 and the piston moves from the position shown in FIG. 4 to the position in FIG. 3 position shown moves. As a result, the relatively higher pressure present at the outlet reaches the area above the diaphragm 27. As a result of the simultaneous action of the compression spring 25, the control valve is moved into its second position, shown in FIG. 2, in which the first section 9 of the valve chamber passes through the valve The valve body 19 is separated from the second section 10 and the interior of the cylinder 6 is connected to the bore 11 by lifting the valve body 18 from the valve seat 16. As a result, the pressure in the interior of the cylinder 21 decreases, so that the compression spring 69 moves the slide 4 into its second position, shown in FIG. 2, in which the inlet and outlet are separated.

Fließt ausgangsseitig beispielsweise durch Tropfen eines Hahnes eine ganz kleine Menge ab, dann bleibt der Rohrtrenner in der in Fig. 2 gezeigten Sperrstellung, und die geringe Wassermenge wird in bekannter Weise dem Membrandruckspeicher 67 entnommen.If a very small amount flows out on the output side, for example by dropping a tap, the pipe separator remains in the blocking position shown in FIG. 2, and the small amount of water is removed from the diaphragm pressure accumulator 67 in a known manner.

Wird ausgangsseitig eine kleine Wassermenge entnommen, dann wird die in Fig. 6 gezeigte dritte Stellung erreicht. Der Schieber 4 und das Rückschlagventil 64 sind in Durchflußstellung. Der Kolben 41 hat sich aus der in Fig. 3 gezeigten Stellung in die in Fig. 4 gezeigte Stellung bewegt. Das wird dadurch erreicht, daß das Ventil 32, 33 mit einer größeren Vorspannung beaufschlagt ist als das Produkt aus Kolben 41 in Verbindung mit der Feder 48. Der Druckhalteeffekt zwischen Leitung 65 und 49 ist bei dem Ventil 32, 33 größer als zwischen Kolben 41 und Feder 48. Eine kleine Wassermenge ist über die Leitungen 65 und 49 entnehmbar. Verringert sich die Wassermenge wieder etwas, dann wird zunächst das Rückschlagventil 64 wieder in die Sperrstellung zurückbewegt, und anschließend setzt die Rückbewegung des Kolbens 41 aus der in Fig. 4 gezeigten in die in Fig. 3 gezeigte Stellung ein. Vergrößert sich vor Erreichen der in Fig. 3 gezeigten untersten Kolbenposition die Wassermenge wieder, geht der Kolben wieder nach oben, ohne daß zwischendurch der Schieber 4 in die Trennstellung gegangen wäre. Das Ventil 36 bringt somit eine Dämpfung und Minderung der Schalthäufigkeit des Schiebers 4 mit sich.If a small amount of water is removed on the outlet side, the third position shown in FIG. 6 is reached. The slide 4 and the check valve 64 are in the flow position. The piston 41 has moved from the position shown in FIG. 3 to the position shown in FIG. 4. This is achieved in that the valve 32, 33 is subjected to a greater pre-tension than the product from piston 41 in connection with the spring 48. The pressure holding effect between line 65 and 49 is greater in the valve 32, 33 than between piston 41 and Spring 48. A small amount of water can be removed via lines 65 and 49. If the amount of water decreases again somewhat, the check valve 64 is first moved back into the blocking position, and then the return movement of the piston 41 starts from the position shown in FIG. 4 to the position shown in FIG. 3. If the amount of water increases again before the lowest piston position shown in FIG. 3 is reached, the piston goes up again without the slide 4 going into the disconnected position in between. The valve 36 thus brings about damping and reducing the switching frequency of the slide 4.

Claims (5)

1. A pipe separator comprising blocking means (4) connecting in a first position an inlet (2) with an outlet (3) of said pipe separator (1) and separating in a second position said inlet (2) from said outlet (3), a control valve (7) formed as a pressure comparing valve and having the pressure prevailing at the inlet (2) acting on a first side thereof and having the pressure prevailing at the outlet (3) acting on a second side thereof for switching said blocking means (4) in the first position or the second position, resp., a shut-off valve (32, 33) biased into a position blocking the flow from the inlet (2) to the outlet (3), and a check valve (64) bridging said shut-off valve (32, 33) by a bypass (65, 49) during low consumption of water,
characterized in that a hydraulically controlled valve (36) is provided in series with said check valve (64) applying in a first valve position the pressure prevailing at the outlet (3) and applying in a second valve position the ambient pressure to the second side of said pressure comparing valve (7).
2. The pipe separator according to claim 1, characterized in that said valve (36) is formed as a time lag device.
3. The pipe separator according to claim 2, characterized in that the valve body (41) of said valve (36) comprises a passage between both opposite sides of the valve body having a throttling effect.
4. The pipe separator according to one of claims 1 to 3, characterized in that said valve (36) is formed as a three-position-two-direction valve.
5. The pipe separator according to one of claims 1 to 4, characterized by an optical display (43, 37) indicating the operational state of said valve (36).
EP86903365A 1985-06-05 1986-06-05 Pipe cut-off device Expired - Lifetime EP0222858B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86903365T ATE40434T1 (en) 1985-06-05 1986-06-05 PIPE SEPARATOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3520250 1985-06-05
DE19853520250 DE3520250A1 (en) 1985-06-05 1985-06-05 TUBE DISCONNECTOR

Publications (3)

Publication Number Publication Date
EP0222858A1 EP0222858A1 (en) 1987-05-27
EP0222858B1 EP0222858B1 (en) 1989-01-25
EP0222858B2 true EP0222858B2 (en) 1992-03-11

Family

ID=6272562

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86903365A Expired - Lifetime EP0222858B2 (en) 1985-06-05 1986-06-05 Pipe cut-off device

Country Status (5)

Country Link
US (1) US4745946A (en)
EP (1) EP0222858B2 (en)
JP (1) JPS63500051A (en)
DE (2) DE3520250A1 (en)
WO (1) WO1986007400A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3626825A1 (en) * 1986-08-08 1988-02-18 Gruenbeck Josef Wasseraufb PIPE SEPARATION WITH A LOCKING DEVICE AND A MONITORING DEVICE FOR THE LOCKING DEVICE
EP0305557B1 (en) * 1987-08-31 1990-05-02 Honeywell-Braukmann GmbH Anti-backflow valve for drinking water
DE4101114C1 (en) * 1991-01-16 1992-06-04 Gruenbeck Wasseraufbereitung Gmbh, 8884 Hoechstaedt, De
DE4142866C2 (en) * 1991-12-23 1994-03-03 Gruenbeck Josef Wasseraufb Pipe separator
DE4204386C2 (en) * 1992-02-14 1994-01-20 Honeywell Braukmann Gmbh System separator
DE19819852C2 (en) * 1998-05-05 2000-09-07 Gruenbeck Josef Wasseraufb Pipe cutting device and hydraulically driven lifting device with such a pipe cutting device
US20040231721A1 (en) * 2002-10-18 2004-11-25 Rand Ackroyd Spill-resistant relief valve
US20180289556A1 (en) 2017-04-11 2018-10-11 Ipcapital Group, Inc. Wound covering apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2849825C2 (en) * 1978-11-17 1984-05-10 Lang Apparatebau GmbH, 8227 Siegsdorf Drinking water flow fitting with a flow monitor built into a drinking water supply line
DE3247325C2 (en) * 1982-12-21 1990-02-15 Grünbeck Wasseraufbereitung GmbH, 8884 Höchstädt Pipe separator
DE3323324C3 (en) * 1983-06-29 1995-10-12 Schubert & Salzer Gmbh & Co In Method and device for controlling a pipe separator as a function of a pressure difference specified at a comparison point
DE3442748A1 (en) * 1984-11-23 1986-05-28 Lang Apparatebau GmbH, 8227 Siegsdorf DEVICE FOR PROTECTING DRINKING WATER PIPES

Also Published As

Publication number Publication date
JPS63500051A (en) 1988-01-07
WO1986007400A1 (en) 1986-12-18
DE3520250C2 (en) 1989-03-02
EP0222858A1 (en) 1987-05-27
DE3520250A1 (en) 1986-12-11
US4745946A (en) 1988-05-24
DE3661950D1 (en) 1989-03-02
EP0222858B1 (en) 1989-01-25

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