| 摘要 |
An electro-hydraulic actuating arrangement as two servo control valves responsive to respective, nominally identical signals to provide output pressures, a further servo valve responsive to the output pressures of either, or both, servo control valves to provide operating pressures to selected sides of a piston actuator, an secondary actuator responsive to a difference between said output pressures to modify said electrical control signals in a way to reduce said difference, and lock valve responsive to a failure of a supply pressure, a failure of said electrical signals, or an increase in said pressure difference beyond a predetermined amount, to isolate both sides of said piston, and thereby prevent operation of the arrangement.
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