| 摘要 |
PURPOSE:To adhere a valve body to a valve seat stably and reliably with time, by using a press force, produced resulting from curved deformation of an electrostriction element, and the energizing force of a magnetic force applying means. CONSTITUTION:A laminar electrostriction element 8, to both surfaces of the one end of which valve bodies 6 and 7 are locked, is positioned between valve seats 3 and 5. The other end part of the electrostriction element 8 is supported in a cantilever type manner to a body 1. A magnetic force applying means 13, e.g., a permanent magnet, is situated around the valve seat 3 of an inlet flow passage 2, and by exerting a magnetic force on, for example, an iron series metallic sheet 8a, with which the electrostriction element 8 is formed, an energizing force is generated in a direction in which the valve body 6 is forced to approach the valve seat 3.
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