Direct drive servovalve having two landed spool power stage

Details Direct drive servovalve having two landed spool power stage Direct drive servovalve having two landed spool power stage

1994-01-27

1996-04-02

Martin, David S.

Electricity: motive power systems

Torquing motors

318687, 25112903, G05B 1700

Patent

active

055044093

ABSTRACT:
A direct drive servovalve which includes a limited angle force motor having an eccentric engaging a two landed spool for converting rotary motion of the motor rotor into linear motion of the spool so as to control the flow of fluid from a source under pressure thereof of to a load. The two landed spool is in direct contact with a wall of the bore defined within the valve housing as opposed to utilization of a sleeve interposed between the wall of the bore and the spool valve. A pressure equalizing passageway is connected between the pressure passageways for the purpose of substantially reducing pressure drop when the spool valve translates to allow flow of fluid through the valve.

REFERENCES:
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patent: 2769943 (1956-11-01), Matthews
patent: 4197474 (1980-04-01), Honigsbaum
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patent: 4339737 (1982-07-01), Meyers et al.
patent: 4452423 (1984-06-01), Beblavi et al.
patent: 4702123 (1987-10-01), Hirao et al.
patent: 4793377 (1988-12-01), Haynes et al.
patent: 4889161 (1989-12-01), Janecke
patent: 5150876 (1992-09-01), Pickard

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