Method and device for isolating an electro-conductive flowing medium

A voltage blocking device for conveying an electrically conducting fluid therethrough, comprising:

• a housing (2) including a housing outer wall and a first intermediate wall (8), wherein a first chamber (10) and a second chamber (11) are provided on opposite sides of said first intermediate wall (8) within said housing outer wall, wherein an annular receiving channel (30) and an outlet opening (31) are provided in said housing, and wherein an annular drainage channel (44) is provided in said housing axially next to said annular receiving channel (30);
• an electrically insulating liquid contained in said second chamber (11);
• a movable nozzle needle (17) having a free first end that is movably arranged in said housing and that has therein at least one radially extending discharge opening (29), and having a longitudinal channel that extends longitudinally axially in said movable nozzle needle and that communicates with said at least one radially extending discharge opening (29), wherein said free first end of said nozzle needle is movable between a first position and a second position within said housing, and wherein said free first end in said second position is located in said second chamber containing said electrically insulating liquid;
• a first drive (19, 20, 21) connected to said movable nozzle needle and adapted to move said movable nozzle needle selectively between said first position and said second position;
• a first closure member (32) that is movably arranged and guided in said first intermediate wall so as to selectively open and close said annular receiving channel (30);
• and
• a second closure member (50) that is movably arranged so as to selectively open and close said at least one radially extending discharge opening (29) in said free first end of said nozzle needle.