Fluid handling – Systems – Multi-way valve unit
Patent
1983-10-04
1985-03-12
Garrett, Robert E.
Fluid handling
Systems
Multi-way valve unit
91 37, 251133, 74 8915, F17D 301, F15B 2102
Patent
active
045038880
ABSTRACT:
A rotary to linear control for actuating an axially movable spool of a digital rotary input servovalve has a threaded drive between a rotating nut and a threaded shank directly connected to the spool. The threads are hydrostatically preloaded to eliminate thread backlash and provide improved valve-actuator stability. The rotary drive is a digital stepper motor capable of moving at incremental movements about its rotational axis which rotates the nut. The threads provide a preload and a cushioning effect which essentially provides an accurate reference position for the axially movable spool each time the threads are actuated.
REFERENCES:
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patent: 1024884 (1912-04-01), Fitts et al.
patent: 3381712 (1968-05-01), Wittren et al.
patent: 3530764 (1970-09-01), Tomita
patent: 3695295 (1972-10-01), Olsen et al.
patent: 3752038 (1973-08-01), Inaba et al.
patent: 3760687 (1973-09-01), Inaba et al.
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patent: 4235156 (1980-11-01), Olson
Publication, The Electro-Hydraulic Stepping Motor, A Digital Hydraulic Actuator, by Albert J. Sperbeck et al, Microprocessors in Fluid Power Seminar, Nov. 19, 1980.
Garrett Robert E.
Li H. Edward
MTS Systems Corporation
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