| 摘要 |
<p>A fast operating bistable valve has a movable spherical plug (22) made of magnetic material and a chamber (20) in which the plug is disposed. The chamber has an interior wall shaped to guide the plug along an axis between a first end position and a second end position. A first pole piece (16) made of magnetic material is disposed at the first end position. A first port (24) opens into the chamber such that the plug covers the first port in one end position. A second port (10) opens into the chamber in communication with the first port when the plug is in the other end position. Responsive to a periodic electric current, a first periodic magnetic field of a first given polarity parallel to the axis is generated in the first pole piece to attract periodically the plug to the first end position. The plug is placed in the second end position in the absence of the electric current.</p> |
