Hydraulic system
AssigneeRausch & Pausch GmbH
InventorsTim Rubitzko, Frank Lauterbach
Life of this patent
Estimating the term…
Abstract
In a hydraulic system which is biased to a minimum system pressure using a bias valve or other flow obstruction disposed in a tank line, there is provided in a bypass line to the bias valve an evacuating and filling valve through which the hydraulic system is first evacuatable and subsequently fillable with a hydraulic fluid. The valve closes the bypass when a differential pressure overcomes a preadjusted force of a spring element. For this purpose, the valve possesses a displaceably mounted valve body with an integrated throttle and a seal face which closes a through opening when the valve body is shifted against the bias force of the spring element due to the pressure difference.
Claims17
A hydraulic system comprising:
- a tank line with a tank port and a bias valve in the tank line, wherein the bias valve is so adjusted or adjustable that it opens a flow path in a direction towards the tank port when a pre-specified hydraulic pressure is reached or exceeded on the bias valve in the tank line on a hydraulic system facing away from the tank port, there being provided in the hydraulic system as a bypass to the bias valve a valve device for evacuating and filling the hydraulic system,
- through which the hydraulic system can be evacuated when a negative pressure is produced on the valve device on a tank side facing towards the tank port, and
- through which the hydraulic system is fillable with hydraulic fluid from the tank side of the valve device,
- wherein the valve device closes a flow through the bypass when a pre-specified pressure difference exists on the valve device, which is defined by a first hydraulic pressure on the hydraulic-system side, and by a second hydraulic pressure which is smaller than the first hydraulic pressure on the tank side.
Dependencies are inferred from the claim text.