Abstract: A tubular filter with porous silicon carbide for filtering particles of soot out of the exhaust gas of a diesel engine is mounted between two holders in a gas duct where one of the holders is spring loaded and the other has a bore that communicates with a bore connecting with the inside of the filter. The holders have surfaces facing the filter that are concavely spherical. The filter ends are provided with matching convexly spherical surfaces and they are directly on the filter ends or on an intermediate piece tightly seated on the filter end. The spherical surfaces are not necessary at the spring loaded holder and for some embodiments the holder can have a convexly spherical surface. The placing of the filter in a duct does not always permit the holders to be exactly opposite each other, but the filter mounting can be accommodated to somewhat offset holders because the gas tightness of the compression joints remain tight when the position of the filter is slightly oblique in the duct.

Abstract: A gas-cooled nuclear reactor, having a tight connection with an intentionally provided leak site between a fission-gas discharge channel formed in a reactor core carrying plate as well as in a head portion of encased fuel elements that are suspended in receiving bores formed in the core carrying plate, the tight connection being formed by an annular member having a sealing surface engaging the core carrying plate at a region thereof in which an opening to the fission-gas discharge channel formed in the core carrying plate is located, a gas-tight, elastic and substantially cylindrical member, variable in length, connecting the annular member to the fission-gas discharge channel formed in the head portion of the fuel element, compression spring means biasing the annular member in a direction away from the fission gas discharge channel formed in the fuel-element head portion, and a sealing abutment plate secured to a central pin and limiting clearance for play of the annular member with respect to an annular zon