Abstract: Pressure and output properties of electro-hydraulic single rod cylinder systems controlled with symmetrical and asymmetrical valves respectively are studied. Some basic static properties are revealed and asymmetrical valve controlled single rod cylinder systems are supposed to be the best way to develop high performance hydraulic control. Load match is discussed and correspondingly some guidelines are given for the system design. Theoretical foundation is established as to do some further research of its control strategy and improve the performance of such kind of system.

Key words: Power element output property, Pressure property Pressure surge, Valve controlled single rod cylinder