Fluid handling – Processes
Patent
1987-11-05
1990-03-13
Michalsky, Gerald A.
Fluid handling
Processes
13762562, 13762563, 13762564, F15B 1343
Patent
active
049076159
ABSTRACT:
Electrohydraulic servovalve structure and method. The servovalve structure has minimum oil passage length and oil volume and a high response force motor with a light weight armature and a stiff flexible tube and includes a second stage pilot valve having an axially movable metering spool therein and a non contacting, electromagnetic, proximity type sensor positioned adjacent one end of the spool for converting axial spool position to an electrical signal. In modifications, a quartz or ceramic window is placed between the one end of the spool and sensor and electronics are placed on the servovalve adjacent the sensor for providing a low impedance spool position output signal from the servovalve. In accordance with the method of the invention, the axial position of the spool is sensed by the eddy current sensor and an electrical signal is provided representative of the position of the spool for use in controlling the electrohydraulic servovalve. In a modification, the position representative signal is converted to a low impedance signal at the servovalve.
REFERENCES:
patent: 2953123 (1960-09-01), Reen et al.
patent: 4266572 (1981-05-01), Schuttenberg et al.
patent: 4456031 (1984-06-01), Taplin
patent: 4623003 (1986-11-01), Leonard
Kachman Robert D.
Meyer Endre A.
Michalsky Gerald A.
Schenck Pegasus Corporation
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