F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
341/103
F15B 9/03 (2006.01) F15B 13/04 (2006.01) F15B 13/043 (2006.01)
Patent
CA 1204193
POWER TRANSMISSION Abstract of the Disclosure An electro-hydraulic servo valve system comprising a two-stage spool type servo valve including a first stage comprising an electrical force motor and a second stage including a spool for controlling flow to an actu- ator. The force motor is operable upon receipt of a com- mand electrical signal to move the spool. A first feed- back is operable to cause the force motor to stop the movement of the spool. A second feedback is also operable to stop the movement of the spool at a predetermined posi- tion. The second feedback has a greater gain than said first feedback so that it normally dominates in the system. The second feedback comprises a pair of identical electrical sensors connected in parallel, and operable by movement of the spool. A comparator circuit compares the electrical signals from the sensors and is operable when the signals deviate from one another by a predetermined amount to disable the second feedback so that the first feedback will function permitting the electro-hydraulic servo valve system to operate without the second feedback.
425564
Marks & Clerk
Vickers Incorporated
LandOfFree
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