Abstract: In a piston pump, in particular, for the pressure fluid conveyance in hydraulic, slip-controlled brake systems, comprising at least one piston, a suction valve and a pressure valve, it will be possible for the suction and pressure valves to be externally checked in that the suction valve and the pressure valve are formed on a structural unit adapted to be separately handled. Preferably, the structural unit comprises a sleeve-type section in which the piston is guided.

Abstract: A non-powered evacuation and fill valve assembly is provided that is suitable for use in connection with hydraulic brake system. The assembly utilizes a pressure differential and/or the properties of material expansion to provide a tight seal. During evacuation of air from the system, the assembly is in an “open” position to permit air to pass. After the air has been evacuated from the system and the system has been filled with fluid, the valve assembly will assume a “closed” position. Thereafter, a tight seal is provided as long as the system is filled with a requisite amount of fluid.

Abstract: In a pump with a pump housing which includes at least one working chamber and a valve bore connected to the working chamber and wherein an inlet valve and an outlet valve are arranged one behind the other, and with a displacement element that is adapted to reciprocate and, by its movement, varies the volume of the working chamber, the valve sea, the closing element and a valve spring of the inlet valve or the outlet valve which presses the closing element against the valve seat, are interconnected to provide a cartridge which can be installed into the valve bore so as to seal, and the cartridges of both valves are installed from the same side into the valve bore and are supported in the installation direction on the pump housing by a step in the valve bore.