Self-monitoring dual-spool servovalve

Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator

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Details

91 31, 91363A, 91437, 91510, 13759616, F15B 13043, F15B 2000

Patent

active

043389651

ABSTRACT:
An improved electrohydraulic servovalve has first and second valve spools mounted for independent sliding movement relative to a body in response to a common command signal. The valve has a first drive mechanism operatively arranged to cause a desired motion of one valve spool in response to the command signal, and has a second drive mechanism operatively arranged to cause a desired simultaneous similar motion of the other valve spool in response to the command signal. The improvement comprises a differential position sensing mechanism arranged to sense the relative positions of the two valve spools and operative to produce an output related to the difference therebetween, and an indicating device supplied with such output and operative to indicate substantially dissimilar relative positions of the spools.

REFERENCES:
patent: 3139109 (1964-06-01), Ruchser
patent: 3270623 (1966-09-01), Garnjost et al.
patent: 3338138 (1967-08-01), Wood
patent: 3338139 (1967-08-01), Wood
patent: 3554084 (1971-01-01), Rasmussen et al.
patent: 3937254 (1976-02-01), Stahle
patent: 4009642 (1977-03-01), Vanderlaan
W. J. Thayer, Technical Bulletin 127, Redundant Electrohydraulic Controls, Published May, 1976 by Moog, Inc.

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