Hydraulische Schaltung

摘要

The invention concerns a hydraulic circuit with a reservoir which supplies hydraulic fluid via a pump to a consumer, and with a return filter comprising a filter housing containing a filter element for the hydraulic fluid returning along a return line from the consumer. In order to make degassing easier, the invention proposes that a first pressure valve is fitted in the return line before it enters the return filter, the valve not allowing the returning fluid to enter the filter until the pressure has risen above a predetermined first value. Connected to the return line upstream of the first pressure valve is a degassing device leading to the atmosphere and a bypass line containing a second pressure valve and leading to the hydraulic-fluid reservoir. The second pressure valve does not open until the pressure has risen above a predetermined second value and allows fluid to return past the return filter to the reservoir, the second pressure being higher than the first. The degassing device allows gas to flow out to the atmosphere, but prevents hydraulic fluid from escaping.