Abstract: A method for the production of a stop valve for pipes, with a housing which consists of plastic, has two pipe connectors and in which a blocking element, which can be adjusted by an actuation unit between a flow position and a blocking position, is mounted at least by means of bearing rings and seals. This method includes injecting plastic around the inner part, which comprises the blocking element as well as the bearing and sealing rings, in the pre-assembled state with the use of an adhesion means to form the housing.

Abstract: In order to extend the available spectral range and to optimize spectral resolution while retaining a compact spectrometer setup, two diffraction gratings are operated with congruent focal curves in a Paschen-Runge geometry. The spectrometer features only one entrance slit and allows an adequate adaptation of the covered spectral range to the demands of analytical spectrometry. Apart from photomultiplier tubes commercial solid-state linear array sensors placed tangential at the Rowland circle are used for simultaneous detection of the spectrum. By employing angular cut cylindrical mirrors the radiation is deflected by 90% upward or downward in an alternating series. In this way two effects are achieved, an almost complete detection of the spectrum firstly and secondly a gain of intensity by focusing of radiation perpendicular to the plane of dispersion.

Abstract: The invention relates to a device (10) for UV irradiation, each UV module (14) being designed as an immersible radiator and being in each case formed by a round UV radiator (26) which is designed as a mercury low-pressure radiator and is enclosed by a sleeve tube (28) which is transparent to UV rays, each UV module (14) being assigned an irradiation space (24) having a square cross section, the center of which is also the center (18) of the UV radiator (26) and which in each case extends from the center (18) half-way to the neighboring UV modules (14), the centers (18) of four neighboring UV modules (14) forming the corners of a square (20), the area of which corresponds to the sum of the cross-sectional area (F1) of a UV module (14) and the cross-sectional area (F2) of the irradiation space (24) of a UV module, and in that the spacing of the UV modules (14) from one another is selected in such a way that the cross-sectional area (F2) of the irradiation space (24) of each UV module (14) is no more than 10 tim