Abstract: A butterfly valve includes an annular, elastic sealing element that encloses an axial opening, a valve disk which is disposed inside the axial opening so as to be rotatable transversal to the axial direction, a device for rotating the valve disk between closed and open positions in order to control a fluid flow through the opening, and at least two valve housing parts that enclose the sealing element in an annular manner and embrace two flanges which are connected to an inlet and an outlet. Conical contact areas of the flanges and/or the valve housing parts cooperate in such a way that the flanges are axially pressed in a sealing fashion against the sealing element by means of the valve housing parts in the operationally mounted state. The flanges are respectively connected in a rigid and positive manner to a couple of clamps.

Abstract: A tank-cleaning device, having a housing (1) insertable into an opening of a tank, which housing has a rotationally fixed housing part (2) communicating with an ink for the cleaning fluid and a nozzle holder (4) rotatable relative to the rotationally fixed housing part (2) about a first pivot axis (5), and having at least one nozzle assembly with four nozzles (8, 9, 10, 11) that is disposed on the nozzle holder (4) rotatably about a second pivot axis (7), while having a simple structure, enables thorough cleaning of tanks with narrow tank openings, if two nozzles at a time (8, 9; 10, 11) of the nozzle assembly (6) are disposed at an acute angle (12) to one another in the form of respective V-formations (13, 14), and the two V-formations (13, 14) have essentially opposed directions (15).

Abstract: The invention relates to a dual-seat valve that switches without leakage. On both the valve seat and the closing member, a respective cylindrical face is provided, and these faces together form a throttle gap. In the cleaning stroke of the closing member, pressure spikes in the leakage chamber are averted. In the cleaning of the seat, the flow of cleaning medium is also comparatively insensitive to fluctuations in the cleaning stroke.

Abstract: The invention relates to a double seat valve in which it is possible to clean an upper valve seat and a lower valve seat separately. To that end, a cylinder is provided as the drive mechanism, which in contrast to the prior art makes do with only three pistons. Nevertheless, in the cleaning stroke additional closing force can be brought to bear on a valve plate that is closed in that process.