EP0808665A2 - Piston valve - Google Patents

Piston valve Download PDF

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Publication number
EP0808665A2
EP0808665A2 EP97107993A EP97107993A EP0808665A2 EP 0808665 A2 EP0808665 A2 EP 0808665A2 EP 97107993 A EP97107993 A EP 97107993A EP 97107993 A EP97107993 A EP 97107993A EP 0808665 A2 EP0808665 A2 EP 0808665A2
Authority
EP
European Patent Office
Prior art keywords
liquid
extension
piston valve
cylinder
valve according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97107993A
Other languages
German (de)
French (fr)
Other versions
EP0808665A3 (en
EP0808665B1 (en
Inventor
Gunter Dr. Börner
Jörg Dr. Sopka
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.)
ABB Research Ltd Switzerland
ABB Research Ltd Sweden
Original Assignee
ABB Research Ltd Switzerland
ABB Research Ltd Sweden
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 ABB Research Ltd Switzerland, ABB Research Ltd Sweden filed Critical ABB Research Ltd Switzerland
Publication of EP0808665A2 publication Critical patent/EP0808665A2/en
Publication of EP0808665A3 publication Critical patent/EP0808665A3/en
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Publication of EP0808665B1 publication Critical patent/EP0808665B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material
    • B05B5/1658—Details
    • B05B5/1666—Voltage blocking valves, e.g. with axially separable coupling elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/1481—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet comprising pigs, i.e. movable elements sealingly received in supply pipes, for separating different fluids, e.g. liquid coating materials from solvent or air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material
    • B05B5/1625—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom
    • 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
    • Y10T137/8376—Combined

Definitions

  • the invention relates to a piston valve for liquids with potential separation between liquids on the input and output sides at different electrical potentials according to the preamble of claim 1.
  • valve can be used to control electrically conductive liquids, such as water-based paint, which are sprayed with electrostatic charge. Potential differences of approximately 100 kV direct voltage can occur between the valve inlet and outlet.
  • the invention is therefore based on the object of specifying a piston valve for liquids and with electrical isolation, which has a longer service life.
  • a field strength reduction is achieved which leads to a significant improvement in the durability of the valve materials.
  • an electrical field strength in the valve body of less than 20 kV / mm can be achieved with potential differences of up to 200 kV.
  • the desired field strength reduction can be set by suitable electrode design and by additional electrodes.
  • Figures 1 and 2 show a schematic representation of a preferred valve design.
  • a valve piston 1 which is movable therein and which is also made of an electrically insulating material.
  • Suitable materials for the electrically insulating cylinder 5 are ceramics and in particular glasses, for example borosilicate glasses.
  • the piston is provided with sealing rings 10.
  • the piston 1 is displaced in the cylinder 5 with the aid of a pneumatic, hydraulic or electrical drive (not shown), as a result of which a liquid inlet 12 is opened, as shown in FIG. 1, or is closed, as in FIG is shown.
  • an additional insulation liquid 14 can also be pressed into the space between valve piston 1 and cylinder 5. This additional insulation liquid 14 should be selected in a media-specific manner since it contaminates the liquid 8 controlled by the valve. If the controlled liquid 8 is water-based paint, paraffin oil offers itself as an additional insulation liquid 14.
  • a control electrode 2 is arranged on an extension 11 of the cylinder 5.
  • the extension 11 is made of metal.
  • this extension can also be made from the electrically insulating material of the cylinder 5 instead of metal.
  • the metal should be chemically resistant to the medium, e.g. Be water-based paint.
  • a suitable material for the extension 11 is steel.
  • the metallic extension 11 can be connected to the electrically insulating cylinder 5, for example by gluing or melting, the connection point being smoothed inside so that the valve piston 1 can slide over the connection point.
  • the metallic extension 11 shown is shaped to the control electrode 2, so that there is an electrical connection between the control electrode 2 and the liquid 8.1 located at an outlet 9. If the extension is not made of metal, but of electrically insulating material, e.g. Glass is made, the control electrode 2 is placed and melted so that there is also an electrical connection between the liquid 8.1 and the electrode 2.
  • An electrode shape with a radius of curvature of at least three millimeters is particularly suitable. The control electrode 2 is therefore always at the potential of the liquid 8.1 on the outlet side and causes a field strength reduction at the valve.
  • Electrical insulation from the outside can be achieved by enveloping the valve arrangement with an electrical insulation means 3, for example polyethylene. If a liquid insulation medium, for example an oil, is used, a correspondingly tight housing 4 around the insulation medium 3 is necessary.
  • additional electrodes 6, 7 can be arranged to further reduce the field strength.
  • a first additional electrode 6 is arranged on a further extension 11.1. Both for the further extension 11.1 and for the first additional electrode 6, the description of the extension 11 or electrode 2 applies analogously with regard to material, design and potential.
  • a second additional electrode 7 is arranged on a feed line 15 and is at ground potential.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Valve Device For Special Equipments (AREA)
  • Compressor (AREA)
  • Sliding Valves (AREA)
  • Nozzles (AREA)

Abstract

The piston valve has a cylinder (5) containing a linearly displaced piston (1), with electrical isolation of the fluid inlet (12) from the fluid outlet (9), so that the fluid (8) can be held at earth potential at the inlet while the fluid (8.1) at the outlet is at a HV potential. The cylinder has an extension (11) associated with a control electrode (2), held at the same potential as the fluid at the valve outlet. Both the cylinder and the extension can be made of glass or ceramics.

Description

Die Erfindung bezieht sich auf ein Kolbenventil für Flüssigkeiten mit Potentialtrennung zwischen ein- und ausgangsseitig auf unterschiedlichem elektrischem Potential befindlichen Flüssigkeiten nach dem Oberbegriff des Anspruchs 1.The invention relates to a piston valve for liquids with potential separation between liquids on the input and output sides at different electrical potentials according to the preamble of claim 1.

Ein solches Kolbenventil und auch eine typische Auswendung ist aus der internationalen Patentanmeldung WO 93/23173 bekannt. Das Ventil ist einsetzbar zur Steuerung elektrisch leitfähiger Flüssigkeiten, wie beispielsweise Farblacken auf Wasserbasis, die mit elektrostatischer Aufladung versprüht werden. Zwischen Ventilein- und -auslaß können Potentialdifferenzen von etwa 100 kV Gleichspannung auftreten.Such a piston valve and also a typical application is known from international patent application WO 93/23173. The valve can be used to control electrically conductive liquids, such as water-based paint, which are sprayed with electrostatic charge. Potential differences of approximately 100 kV direct voltage can occur between the valve inlet and outlet.

Bei der Erprobung solcher Ventile hat sich gezeigt, daß die betrieblich auftretenden Potentialdifferenzen hohe elektrische Feldstärken zur Folge haben, die wiederum zu einer

Figure imgb0001
elektrischen Alterung" der in den Ventilen verwendeten Materialien führen. Es ergeben sich dadurch unzureichende Standzeiten der Ventile, insbesondere im Fall einer Anwendung zur elektrostatischen Serienlackierung von Automobilen.When testing such valves, it has been shown that the operationally occurring potential differences result in high electrical field strengths, which in turn lead to a
Figure imgb0001
lead to electrical aging "of the materials used in the valves. This results in inadequate service life of the valves, particularly in the case of an application for electrostatic series painting of automobiles.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Kolbenventil für Flüssigkeiten und mit Potentialtrennung anzugeben, das eine längere Standzeit aufweist.The invention is therefore based on the object of specifying a piston valve for liquids and with electrical isolation, which has a longer service life.

Diese Aufgabe wird bei einem Kolbenventil nach dem Oberbegriff des Anspruchs 1 durch dessen kennzeichnende Merkmale gelöst. Vorteilhafte Ausgestaltungen sind in weiteren Ansprüchen angegeben.This object is achieved in a piston valve according to the preamble of claim 1 by the characterizing features. Advantageous refinements are specified in further claims.

Mit der vorgeschlagenen Gestaltung des Kolbenventils, also durch Anordnung wenigstens einer Steuerelektrode, die auf dem ausgangsseitigen Flüssigkeitspotential liegt, wird eine Feldstärkeerniedrigung erzielt, die zu einer deutlichen Verbesserung der Haltbarkeit der Ventilwerkstoffe führt. Mit geeignet geformten Steuerelektroden läßt sich bei Potentialunterschieden bis 200 kV eine elektrische Feldstärke im Ventilkörper von weniger als 20 kV/mm erzielen. Die gewünschte Feldstärkereduzierung läßt sich durch geeignete Elektrodengestaltung und durch Zusatzelektroden einstellen.With the proposed design of the piston valve, that is to say by arranging at least one control electrode which is at the liquid potential on the outlet side, a field strength reduction is achieved which leads to a significant improvement in the durability of the valve materials. With suitably shaped control electrodes, an electrical field strength in the valve body of less than 20 kV / mm can be achieved with potential differences of up to 200 kV. The desired field strength reduction can be set by suitable electrode design and by additional electrodes.

Eine ausführlichere Beschreibung der Erfindung erfolgt nachstehend anhand einer Beschreibung von Ausführungsbeispielen unter Bezugnahme auf die Zeichnungsfiguren.A more detailed description of the invention is given below on the basis of a description of exemplary embodiments with reference to the drawing figures.

Es zeigen:

Fig. 1
ein Ventil in geöffnetem Zustand,
Fig. 2
ein Ventil in geschlossenem Zustand.
Show it:
Fig. 1
a valve in the open state,
Fig. 2
a valve in the closed state.

Die Figuren 1 und 2 zeigen in einer schematisierten Darstellung eine bevorzugte Ventilgestaltung.Figures 1 and 2 show a schematic representation of a preferred valve design.

In einem Zylinder 5 aus einem elektrisch isolierendem Material ist ein darin bewegbarer Ventilkolben 1 angeordnet, der ebenfalls aus einem elektrisch isolierenden Material hergestellt ist. Geeignete Materialien für den elektrisch isolierenden Zylinder 5 sind Keramiken und insbesondere Gläser, beispielsweise Borosilikat-Gläser. Der Kolben ist mit Dichtringen 10 versehen.In a cylinder 5 made of an electrically insulating material there is arranged a valve piston 1 which is movable therein and which is also made of an electrically insulating material. Suitable materials for the electrically insulating cylinder 5 are ceramics and in particular glasses, for example borosilicate glasses. The piston is provided with sealing rings 10.

Zum Schließen oder Öffnen des Ventils wird der Kolben 1 mit Hilfe eines nicht dargestellten pneumatischen, hydraulischen oder elektrischen Antriebs im Zylinder 5 verschoben, wodurch ein Flüssigkeitseinlaß 12 freigegeben wird, wie in Fig. 1 dargestellt ist, oder verschlossen wird, wie in Fig. 2 dargestellt ist.To close or open the valve, the piston 1 is displaced in the cylinder 5 with the aid of a pneumatic, hydraulic or electrical drive (not shown), as a result of which a liquid inlet 12 is opened, as shown in FIG. 1, or is closed, as in FIG is shown.

Im geschlossenen Zustand befindet sich zwischen dem mit den Dichtungsringen 10 versehenen Kopfbereich des Kolbens 1 und dem Flüssigkeitseinlaß 12 ein Zylinderteil 5.1, der eine elektrische Isolierung zwischen einer auf Erdpotential befindlichen eingangsseitigen Flüssigkeit 8 und einer auf Hochspannungspotential liegenden ausgangsseitigen Flüssigkeit 8.1 bewirkt. Zur Erhöhung der Durchschlagsfestigkeit kann noch zusätzlich in den Zwischenraum zwischen Ventilkolben 1 und Zylinder 5 eine zusätzliche Isolationsflüssigkeit 14 gedrückt werden. Diese zusätzliche Isolationsflüssigkeit 14 sollte medienspezifisch gewählt werden, da sie die durch das Ventil gesteuerte Flüssigkeit 8 verunreinigt. Wenn die gesteuerte Flüssigkeit 8 Wasserlack ist, bietet sich Paraffinöl als zusätzliche Isolationsflüssigkeit 14 an.In the closed state there is a cylinder part between the head region of the piston 1 provided with the sealing rings 10 and the liquid inlet 12 5.1, which provides electrical insulation between an input-side liquid 8 which is at ground potential and a liquid 8.1 which is at a high-voltage potential. To increase the dielectric strength, an additional insulation liquid 14 can also be pressed into the space between valve piston 1 and cylinder 5. This additional insulation liquid 14 should be selected in a media-specific manner since it contaminates the liquid 8 controlled by the valve. If the controlled liquid 8 is water-based paint, paraffin oil offers itself as an additional insulation liquid 14.

Auf einer Verlängerung 11 des Zylinders 5 ist eine Steuerelektrode 2 angeordnet. Im dargestellten Beispiel ist die Verlängerung 11 aus Metall hergestellt. Diese Verlängerung kann jedoch statt aus Metall auch aus dem elektrisch isolierenden Material des Zylinders 5 hergestellt werden. Im Fall einer metallischen Verlängerung 11 sollte das Metall chemisch restistent gegen das Medium, z.B. Wasserlack sein. Ein geeigneter Werkstoff für die Verlängerung 11 ist Stahl. Die metallische Verlängerung 11 kann mit dem elektrisch isolierenden Zylinder 5 beispielsweise durch Kleben oder Schmelzen verbunden werden, wobei die Verbindungsstelle innen so geglättet ist, daß der Ventilkolben 1 über die Verbindungsstelle gleiten kann.A control electrode 2 is arranged on an extension 11 of the cylinder 5. In the example shown, the extension 11 is made of metal. However, this extension can also be made from the electrically insulating material of the cylinder 5 instead of metal. In the case of a metallic extension 11, the metal should be chemically resistant to the medium, e.g. Be water-based paint. A suitable material for the extension 11 is steel. The metallic extension 11 can be connected to the electrically insulating cylinder 5, for example by gluing or melting, the connection point being smoothed inside so that the valve piston 1 can slide over the connection point.

Die dargestellte metallische Verlängerung 11 ist zur Steuerelektrode 2 ausgeformt, so daß eine elektrische Verbindung zwischen der Steuerelektrode 2 und der an einem Ausgang 9 befindlichen Flüssigkeit 8.1 besteht. Wenn die Verlängerung nicht aus Metall, sondern aus elektrisch isolierendem Material, z.B. Glas hergestellt ist, wird die Steuerelektrode 2 so aufgesetzt und eingeschmolzen, daß ebenfalls eine elektrische Verbindung zwischen der Flüssigkeit 8.1 und der Elektrode 2 besteht. Besonders geeignet ist eine Elektrodenform, deren Krümmungsradius mindestens drei Millimeter beträgt. Die Steuerelektrode 2 liegt also immer auf dem Potential der ausgangsseitigen Flüssigkeit 8.1 und bewirkt eine Feldstärkeerniedrigung am Ventil.The metallic extension 11 shown is shaped to the control electrode 2, so that there is an electrical connection between the control electrode 2 and the liquid 8.1 located at an outlet 9. If the extension is not made of metal, but of electrically insulating material, e.g. Glass is made, the control electrode 2 is placed and melted so that there is also an electrical connection between the liquid 8.1 and the electrode 2. An electrode shape with a radius of curvature of at least three millimeters is particularly suitable. The control electrode 2 is therefore always at the potential of the liquid 8.1 on the outlet side and causes a field strength reduction at the valve.

Eine elektrische Isolation nach außen, also gegenüber der Umgebung kann durch Umhüllen der Ventilanordnung mit einem elektrischen Isolationsmittel 3, z.B. Polyäthylen erreicht werden. Wenn ein flüssiges Isolationsmittel, z.B. ein Öl benutzt wird, ist ein entsprechendes dichtes Gehäuse 4 um das Isolationsmittel 3 notwendig.Electrical insulation from the outside, that is to say from the environment, can be achieved by enveloping the valve arrangement with an electrical insulation means 3, for example polyethylene. If a liquid insulation medium, for example an oil, is used, a correspondingly tight housing 4 around the insulation medium 3 is necessary.

Wie in den Zeichnungsfiguren dargestellt ist, können zur weiteren Feldstärkeerniedrigung noch zusätzliche Elektroden 6, 7 angeordnet werden. Auf einer weiteren Verlängerung 11.1 ist eine erste zusätzliche Elektrode 6 angeordnet. Sowohl für die weitere Verlängerung 11.1, wie auch für die erste zusätzliche Elektrode 6 gelten bezüglich Material, Ausführung und Potential sinngemäß die Beschreibung zur Verlängerung 11 bzw. Elektrode 2.As shown in the drawing figures, additional electrodes 6, 7 can be arranged to further reduce the field strength. A first additional electrode 6 is arranged on a further extension 11.1. Both for the further extension 11.1 and for the first additional electrode 6, the description of the extension 11 or electrode 2 applies analogously with regard to material, design and potential.

In einem dem Flüssigkeitseinlaß 12 vorgeschalteten Einlaßbereich 13 ist auf einer Zuleitung 15 eine zweite zusätzliche Elektrode 7 angeordnet, die sich auf Erdpotential befindet.In an inlet area 13 upstream of the liquid inlet 12, a second additional electrode 7 is arranged on a feed line 15 and is at ground potential.

Claims (11)

Kolbenventil zur Steuerung des Durchflusses einer elektrisch leitfähigen Flüssigkeit (8), wobei - das Kolbenventil einen Zylinder (5) aufweist, mit einem darin befindlichen Kolben (1) und Mitteln (10) zur Dichtung zwischen Zylinder (5) und Kolben (1), und - Mittel (5.1, 1) zur elektrischen Isolierung seines Flüssigkeitseinlasses (12) von seinem Flüssigkeitsauslaß (9) vorhanden sind, so daß bei geschlossenem Ventil eine auf Erdpotential befindliche Flüssigkeit (8) von einer auf Hochspannungspotential befindlichen Flüssigkeit (8.1) potentialgetrennt ist, dadurch gekennzeichnet, daß der Zylinder (5) eine Verlängerung (11) aufweist, an der wenigstens eine Steuerelektrode (2) angeordnet ist, die sich auf demselben elektrischen Potential wie die Flüssigkeit (8.1) am Flüssigkeitsauslaß (9) befindet.Piston valve for controlling the flow of an electrically conductive liquid (8), wherein - The piston valve has a cylinder (5) with a piston (1) and means (10) for sealing between the cylinder (5) and piston (1), and - Means (5.1, 1) for the electrical insulation of its liquid inlet (12) from its liquid outlet (9) are present, so that when the valve is closed, a liquid (8) at ground potential is electrically isolated from a liquid (8.1) at high voltage potential, characterized in that the cylinder (5) has an extension (11) on which at least one control electrode (2) is arranged, which is at the same electrical potential as the liquid (8.1) at the liquid outlet (9). Kolbenventil nach Anspruch 1, dadurch gekennzeichnet, daß der Zylinder (5) und die Verlängerung (11) aus einer Keramik oder einem Glas bestehen und die Steuerelektrode (2) in die Verlängerung so eingeschmolzen ist, daß sie die innerhalb der Verlängerung (11) befindliche Flüssigkeit (8.1) kontaktiert.Piston valve according to claim 1, characterized in that the cylinder (5) and the extension (11) consist of a ceramic or a glass and the control electrode (2) is melted into the extension so that it is within the extension (11) Liquid (8.1) contacted. Kolbenventil nach Anspruch 1, dadurch gekennzeichnet, daß die Verlängerung (11) aus einem Metall besteht und die Steuerelektrode (2) an die Verlängerung (11) angeformt ist.Piston valve according to claim 1, characterized in that the extension (11) consists of a metal and the control electrode (2) is molded onto the extension (11). Kolbenventil nach Anspruch 3, dadurch gekennzeichnet, daß die metallische Verlängerung (11) mit dem elektrisch isolierenden Zylinder (5) verklebt oder verschmolzen ist.Piston valve according to claim 3, characterized in that the metallic extension (11) is glued or fused to the electrically insulating cylinder (5). Kolbenventil nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Anordnung von Zylinder, Verlängerung und Elektrode (5, 11, 2) mit einem elektrischen Isolierstoff (3) umhüllt ist.Piston valve according to one of the preceding claims, characterized in that the arrangement of cylinder, extension and electrode (5, 11, 2) is covered with an electrical insulating material (3). Kolbenventil nach Anspruch 5, dadurch gekennzeichnet, daß die Anordnung in ein Gehäuse (4) eingesetzt ist, das im Fall einer Verwendung eines flüssigen Isolierstoffs (3) flüssigkeitsdicht ausgeführt ist.Piston valve according to claim 5, characterized in that the arrangement is inserted in a housing (4) which is liquid-tight when a liquid insulating material (3) is used. Kolbenventil nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß sich an die Verlängerung (11) mit der Steuerelektrode (2) eine weitere Verlängerung (11.1) anschließt, die aus demselben Material wie die Verlängerung (11) ist und an der eine erste zusätzliche, auf dem Potential der Flüssigkeit (8.1) am Auslaß (9) befindliche Steuerelektrode (6) angeordnet ist.Piston valve according to one of the preceding claims, characterized in that the extension (11) with the control electrode (2) is followed by a further extension (11.1) which is made of the same material as the extension (11) and on which a first additional, on the potential of the liquid (8.1) at the outlet (9) control electrode (6) is arranged. Kolbenventil nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß in einem, dem Flüssigkeitseinlaß (12) vorgeschalteten Einlaßbereich (13) eine zweite zusätzliche Steuerelektrode (7) angeordnet ist, die auf Erdpotential liegt.Piston valve according to one of the preceding claims, characterized in that a second additional control electrode (7) which is at ground potential is arranged in an inlet region (13) upstream of the liquid inlet (12). Kolbenventil nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß sich zwischen dem Kolben (1) und dem Zylinder (5) eine zusätzliche elektrisch isolierende Flüssigkeit (14) befindet.Piston valve according to one of the preceding claims, characterized in that an additional electrically insulating liquid (14) is located between the piston (1) and the cylinder (5). Kolbenventil nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Elektroden (2, 6, 7) aus einem Metall oder aus einem elektrisch leitfähigen Kunststoff hergestellt sind.Piston valve according to one of the preceding claims, characterized in that the electrodes (2, 6, 7) are made of a metal or an electrically conductive plastic. Kolbenventil nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß Krümmungsradien an den Elektroden (2, 6, 7) drei Millimeter oder größer sind.Piston valve according to one of the preceding claims, characterized in that radii of curvature at the electrodes (2, 6, 7) are three millimeters or larger.
EP97107993A 1996-05-22 1997-05-16 Piston valve Expired - Lifetime EP0808665B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19620577A DE19620577A1 (en) 1996-05-22 1996-05-22 Piston valve
DE19620577 1996-05-22

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EP0808665A2 true EP0808665A2 (en) 1997-11-26
EP0808665A3 EP0808665A3 (en) 2001-01-24
EP0808665B1 EP0808665B1 (en) 2003-03-05

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EP97107993A Expired - Lifetime EP0808665B1 (en) 1996-05-22 1997-05-16 Piston valve

Country Status (6)

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US (1) US5797590A (en)
EP (1) EP0808665B1 (en)
JP (1) JPH10109053A (en)
KR (1) KR970073738A (en)
AT (1) ATE233605T1 (en)
DE (2) DE19620577A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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US6849129B2 (en) 2002-03-13 2005-02-01 Lactec Gmbh Paint-spraying apparatus for applying liquid coating material to workpieces

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EP0808665A3 (en) 2001-01-24
DE59709420D1 (en) 2003-04-10
JPH10109053A (en) 1998-04-28
US5797590A (en) 1998-08-25
KR970073738A (en) 1997-12-10
EP0808665B1 (en) 2003-03-05
ATE233605T1 (en) 2003-03-15
DE19620577A1 (en) 1997-11-27

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