公开(公告)号：US5040569A

公开(公告)日：1991-08-20

申请号：US479519

申请日：1990-02-13

申请人： Tadahiko Nogami ,  Ichiro Nakamura ,  Ichiro Maeno

发明人： Tadahiko Nogami ,  Ichiro Nakamura ,  Ichiro Maeno

IPC分类号： B21B31/32 ,  B21B37/62 ,  F15B13/04 ,  F15B13/044 ,  F16K31/06

CPC分类号： F15B13/0446 ,  B21B37/62 ,  F15B13/0406 ,  F15B13/0442 ,  B21B2273/08 ,  B21B31/32 ,  Y10T137/86622 ,  Y10T137/86638

摘要： 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.

公开(公告)号：US5014748A

公开(公告)日：1991-05-14

申请号：US302816

申请日：1989-01-18

申请人： Tadahiko Nogami ,  Ichiro Nakamura ,  Ichiro Maeno ,  Ryohei Kinose

发明人： Tadahiko Nogami ,  Ichiro Nakamura ,  Ichiro Maeno ,  Ryohei Kinose

IPC分类号： F16K3/08 ,  F16K11/074

CPC分类号： F16K11/074 ,  F16K3/085 ,  Y10T137/86622 ,  Y10T137/86638

摘要： 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.