Abstract: A roller seam welding machine is provided with a contour-controlled table for the tank to be welded. The table is driven by a pinion (4) and a pantograph (16), in a known manner. To enable flanges (6) with a three-dimensional profile to be welded, the welding rollers (10,11) are mounted on a vertically traversable head (14) of the machine. This allows the welding rollers to be traversed to suit rises or falls in the welding flange (6). Because the tank itself is manipulated only in a horizontal plane in the conventional manner, with vertical manipulation of the welding rollers as an additional feature, the possibility is afforded in a simple manner of welding tank flanges with three-dimensional profiles with high precision irrespective of the weight and size of the tank.

Abstract: A flow-control valve has a housing having a chamber into which opens a port, a ceramic valve plate fixed in the chamber over the port, formed with a throughgoing aperture aligned with the port, and having a substantially planar face, and a ceramic control plate having a substantially planar face lying flatly on the valve-plate face and formed with a throughgoing aperture. The control plate can be pivoted relative to the valve plate about an axis substantially perpendicular to and traversing the surfaces between an open position with the control-plate aperture overlapping the valve-plate aperture and a closed position with the control-plate aperture aligned axially with a portion of the valve-plate face and offset angularly from the valve-plate aperture and with the valve-plate aperture aligned axially with a portion of the control-plate face and offset angularly from the control-plate aperture.

Abstract: A valve has a housing forming a compartment traversed by an axis and having a radially opening outlet port and an axially open inlet port, a valve plate fixed in the housing and formed relative to the flow direction with a flat upstream face and with an axially throughgoing valve orifice opening at the face, and a control plate in the housing formed relative to a flow direction through the valve with a flat downstream face riding on the valve-plate face, an axially throughgoing control orifice opening at the face, and an axially open and radially elongated socket on the face adjacent the respective orifice. The control plate is pivotal on the valve plate about the axis for alignment of the orifices and flow through the valve from the inlet port to the outlet port and for misalignment of the orifices for restricted flow from the inlet port to the outlet port.

Abstract: A shut-off valve mechanism for a shut-off and control valve has a generally cylindrical housing with inner and outer annular shoulder against which a valve seat disk is placed to prevent distortion of the valve seat disk. The valve control disk is pressed by spring forces against the valve seat disk from its upstream side and is entrained in rotation by a spindle passing through the inner annular shoulder and the valve seat disk.