A new type two-stage proportional electro-hydraulic regulator valve using piezoelectric ceramics is promoted to cancel the requirement of pressure sensor. The piezoelectric ceramics controls the openness of pilot valve. The pressure drops across the fixed damping hole in the pilot supplier,and the throttling orifice of the pilot valve change accordingly. Thus the output pressure of pilot stage is controlled by the piezoelectric actuator and it serves as the command pressure to the main stage. The detailed s...
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