초록 ▼

A control motor for a servo valve is provided. The control motor comprises a control element which can carry out a pivotal movement due to an electric input signal supplied to said motor. The movement of the control element causes a corresponding change of hydraulic resistances and, as a consequence

A control motor for a servo valve is provided. The control motor comprises a control element which can carry out a pivotal movement due to an electric input signal supplied to said motor. The movement of the control element causes a corresponding change of hydraulic resistances and, as a consequence, changes in hydraulic output signals of an hydraulic amplifier actuated by said motor.

대표청구항 ▼

An electrohydraulic pressure transducer apparatus comprising: a control element comprising a piezoelectric element, electrically actuated means for causing a movement of said control element for carrying out a control function so as to change a hydraulic output signal in accordance with an electric

An electrohydraulic pressure transducer apparatus comprising: a control element comprising a piezoelectric element, electrically actuated means for causing a movement of said control element for carrying out a control function so as to change a hydraulic output signal in accordance with an electric input signal, wherein the control function is provided for by a front face of said control element, the moment of resistance of the control element is small in the direction of movement of the control element, but large in the direction in which the force created by the pressure of the hydraulic output signal acts, the front face of the control element has a recess defined therein which is connected with a source of pressure medium, and said recess is connected with stationary recesses which are connected with control ports in the housing or cover of the apparatus.