Abstract: A hydraulic system includes at least two consumers, e.g., a closing unit and an injection unit of an injection molding machine. At least two displacement pumps are provided to produce a fluid flow under pressure to the consumers, whereby at least one control valve is provided for each of the consumers. At least one further valve is provided to control a fluid communication between the output sides of the displacement pumps, wherein at least one of the consumers is supplied with pressure from the outlet of the displacement pumps separately or together in groups.

Abstract: In a method and apparatus for injection molding a multi-component mixture, in particular liquid silicone rubber; a starting material, containing at least two components and, optionally, at least one additive, is conveyed from a storage and metering assembly through a mixer for mixing the starting material, to a reservoir at an amount which is a multiple of an amount required for an injection molding cycle. The mixed starting material is transferred in increments from the reservoir to an injection unit of an injection molding machine. When the reservoir is emptied to a predetermined level a multiple of the amount of starting material required for the injection molding cycle is fed to the reservoir.

Abstract: A hydraulic system includes at least two consumers, e.g., a closing unit and an injection unit of an injection molding machine. At least two displacement pumps are provided to produce a fluid flow under pressure to the consumers, whereby at least one control valve is provided for each of the consumers. At least one further valve is provided to control a fluid communication between the output sides of the displacement pumps, wherein at least one of the consumers is supplied with pressure from the outlet of the displacement pumps separately or together in groups.