Patent ID: 7802971
Filing Date: 2010-09-28
Classification: F04B,F04C

Abstract:
1. A variable delivery feed pump for hydraulic media, comprising an input and an output, at the output a feed pressure (P 1 ) being present, a pressure-reducing element that is connected to the output, at an output of the pressure-reducing element the system pressure (P 2 ) being present and the output of the pressure-reducing element being connected to a consumer, wherein the output of the variable delivery pump is connected to a first input of a pump controller, and a second input of the pump controller is connected to the output of the pressure-reducing element, and wherein the pump controller adjusts the feed pump toward maximum delivery if the system pressure (P 2 ) is smaller than a minimum pressure or if the system pressure (P 2 ) is smaller than the pressure present at the first input, and wherein parallel to the pump controller a pressure limiter is switched such that at a first input thereof the pressure present at the first input of the pump controller is present and that at a control input the system pressure (P 2 ) is present, the pressure limiter opening if the system pressure (P 2 ) is greater than a desired value.