Patent ID: 7278447

Claim:
A device comprised of: a first coil with a first bore therethrough, producing a first magnetic flux when subject to a first electric signal, and a first magnetic flux path associated therewith; a second coil with a second bore therethrough, producing a second magnetic flux when subject to a second electric signal, and a second magnetic flux path associated therewith; a tube extending through said first bore of said first coil and said second bore of said second coil; a magnetic pole piece within said tube and placed generally between said first bore and said second bore; a magnetic ring set outside said tube and generally between said coils; a first end cap magnetically adjacent to said first coil and adapted to form a fluid inlet port; a second end cap magnetically adjacent to said second coil and adapted to form a fluid outlet port; a first axially translatable movable member disposed within said tube and generally between said first end piece and said magnetic pole piece; a first biasing mechanism disposed within said tube and between said magnetic pole piece and said first movable member, wherein said first biasing mechanism is adapted to exert a first force on said first movable member towards said first end cap; a second axially translatable movable member disposed within said tube and generally between said second end piece and said magnetic pole piece; and a second biasing mechanism disposed within said tube and between said magnetic pole piece and said second movable member, wherein said second biasing mechanism is adapted to exert a second force on said second movable member towards said second end cap; wherein said magnetic flux path of said first coil and said magnetic flux path of said second coil share said magnetic pole piece and said magnetic ring to complete their respective magnetic flux paths, and wherein said first movable member axially translates towards said magnetic pole piece in the presence of said first magnetic flux and said second movable member axially translates towards said magnetic pole piece in the presence of said second magnetic flux.