Hitachi, Ltd.

Ichiro Maeno

Ichiro Nakamura

Tadahiko Nogami

Ryohei Kinose

A direct-operated servo valve which exhibits stable damping characteristics. The servo valve is characterized in that a viscous fluid is charged in the gap between a stator and a movable element. The velocity of a valve member is detected and a feed back the velocity signal is obtained by this detection so as to enable a damping of the motion of the valve member.

Direct-operated servo valve, fluid pressure servo mechanism and control

A rotary valve has a valve body having at least one cylindrical hole, and casings provided with sleeves/plugs having an outer diameter substantially equal to an inner diameter of the cylindrical hole. The sleeves/plugs are provided in coaxial relation with the cylindrical hole. A flow of fluid is controlled by the relative motion between the valve body and the casings. The rotary valve may be provided with a high response time even by a small drive force.

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Hitachi, Japan

Ichiro Maeno