Fluid handling – Systems – Sequentially closing and opening alternately seating flow...
Reexamination Certificate
2005-06-03
2008-11-25
Rivell, John (Department: 3753)
Fluid handling
Systems
Sequentially closing and opening alternately seating flow...
C251S030010, C251S065000
Reexamination Certificate
active
07455075
ABSTRACT:
A servo valve has a miniature force motor embedded in a main fluid chamber to directly operate between two nozzles to generate a differential pressure in two ports. The miniature force motor includes two disc ring-shaped magnets in opposing magnetic orientation, an armature base and poppet ends of magnetic material coupled to an armature shaft having pilot ends that interface to form the pilot stage valves at each armature shaft end. The armature shaft extends through a center hole in the magnets, armature base, and the poppet ends and engages bearing elements at each end allowing lateral armature motion. Two elastic members provide restoring forces to the armature assembly. Guide/stops have shaped magnetic surfaces to control the magnetic path and to linearize the force versus stroke and to increase the proportional stroke of the armature.
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Fanestil Bill
Sanchez Rodolfo D.
Xu Yao Hui
Zhao Shen
Minebea Co. Ltd.
Price Craig
Rivell John
Townsend and Townsend / and Crew LLP
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