| 摘要 |
Improved magnetostrictive materials are combined in a novel arrangement to provide a transducer of the electromechanical type particularly suited for the precise control of fluid flow. An embodiment according to this invention comprises a valve assembly having a discharge ported, cylindrical housing of a material exhibiting positive magnetostriction, a plunger of a material exhibiting negative magnetostriction disposed within the housing, the plunger provided with a tapered nose initially in close fitment within the discharge port to restrain the flow of fluids, and means to create a magnetic field around the assembly. As the materials are exposed to the magnetic field the housing expands relative to the contracting plunger, causing the plunger to separate from close, seated fitment within the discharge port, thereby allowing flow through the port. One of the materials may be selected from a non-magnetostrictive material. An alternative embodiment according to this invention comprises a magnetostrictive member interconnected to a plate slidably disposed within a conduit, said plate having an aperture adapted for alignment with the interior conduit passageway, and means to create a magnetic field around the magnetostrictive member. As the member is exposed to the magnetic field, the plate aperture is adjusted within the conduit passageway to control the flow of fluids.
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