Abstract: A fuel filter with a pressure regulating valve for fuel circulated from a fuel tank and injected into an internal combustion engine. The fuel filter comprises a filter pot closed by a cover and an annular filter element for radially filtering flow from the outside in. Fuel flows in and out through main flow connections on opposite sides of the filter. There is a recirculation connection to recirculate fuel. There is a pressure regulating valve on one end of the filter housing with the discharge connection. The pressure regulating valve operates against atmospheric pressure and has a spring-loaded diaphragm which acts in conjunction with a closure ram to close the inlet port of a recirculation flow duct which passes through the center of the filter and connects the regulating valve to the return connection. The diaphragm is fastened with the valve seat in a sealed manner to the edge of the pressure regulator housing, which open into the filter port and is formed in the cover of the filter housing.

Abstract: The invention concerns new oxidation catalysts, methods of producing them and their use. These catalysts consist of titanium silicalites crystallized in situ onto activated charcoal or metal oxides. The titanium silicalite content lies preferably in the range of 30 to 60% by wt. The atomic ratio of Si to Ti in the carrier-borne phase is 10 to 100. Such catalysts are particularly suitable for oxidation reactions with H.sub.2 O.sub.2 under mild conditions, such as temperatures of 20.degree. to 120.degree. C. and pressures equal to or higher than atmospheric.